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 <span id="projectnumber">3.03</span>
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<div class="title">/usr/local/google/home/jbreiden/tesseract-ocr-read-only/textord/devanagari_processing.cpp</div> </div>
102
<div class="contents">
103
<a href="a01106.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**********************************************************************</span>
104
<a name="l00002"></a>00002 <span class="comment"> * File: devanagari_processing.cpp</span>
105
<a name="l00003"></a>00003 <span class="comment"> * Description: Methods to process images containing devanagari symbols,</span>
106
<a name="l00004"></a>00004 <span class="comment"> * prior to classification.</span>
107
<a name="l00005"></a>00005 <span class="comment"> * Author: Shobhit Saxena</span>
108
<a name="l00006"></a>00006 <span class="comment"> * Created: Mon Nov 17 20:26:01 IST 2008</span>
109
<a name="l00007"></a>00007 <span class="comment"> *</span>
110
<a name="l00008"></a>00008 <span class="comment"> * (C) Copyright 2008, Google Inc.</span>
111
<a name="l00009"></a>00009 <span class="comment"> ** Licensed under the Apache License, Version 2.0 (the "License");</span>
112
<a name="l00010"></a>00010 <span class="comment"> ** you may not use this file except in compliance with the License.</span>
113
<a name="l00011"></a>00011 <span class="comment"> ** You may obtain a copy of the License at</span>
114
<a name="l00012"></a>00012 <span class="comment"> ** http://www.apache.org/licenses/LICENSE-2.0</span>
115
<a name="l00013"></a>00013 <span class="comment"> ** Unless required by applicable law or agreed to in writing, software</span>
116
<a name="l00014"></a>00014 <span class="comment"> ** distributed under the License is distributed on an "AS IS" BASIS,</span>
117
<a name="l00015"></a>00015 <span class="comment"> ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
118
<a name="l00016"></a>00016 <span class="comment"> ** See the License for the specific language governing permissions and</span>
119
<a name="l00017"></a>00017 <span class="comment"> ** limitations under the License.</span>
120
<a name="l00018"></a>00018 <span class="comment"> *</span>
121
<a name="l00019"></a>00019 <span class="comment"> **********************************************************************/</span>
122
<a name="l00020"></a>00020
123
<a name="l00021"></a>00021 <span class="preprocessor">#ifdef HAVE_CONFIG_H</span>
124
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="a00950.html">config_auto.h</a>"</span>
125
<a name="l00023"></a>00023 <span class="preprocessor">#endif</span>
126
<a name="l00024"></a>00024 <span class="preprocessor"></span>
127
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="a01107.html">devanagari_processing.h</a>"</span>
128
<a name="l00026"></a>00026 <span class="preprocessor">#include "allheaders.h"</span>
129
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="a01155.html">tordmain.h</a>"</span>
130
<a name="l00028"></a>00028 <span class="preprocessor">#include "<a class="code" href="a00798.html">statistc.h</a>"</span>
131
<a name="l00029"></a>00029
132
<a name="l00030"></a>00030 <span class="comment">// Flags controlling the debugging information for shiro-rekha splitting</span>
133
<a name="l00031"></a>00031 <span class="comment">// strategies.</span>
134
<a name="l00032"></a>00032 <a class="code" href="a00844.html#a554d43d0cf0e3f9552921941d9e147bd">INT_VAR</a>(<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a>, 0,
135
<a name="l00033"></a><a class="code" href="a01107.html#ad6b4d3ded1df0799766c874662d63050">00033</a> <span class="stringliteral">"Debug level for split shiro-rekha process."</span>);
136
<a name="l00034"></a>00034
137
<a name="l00035"></a>00035 <a class="code" href="a00844.html#a442e7f541a050acf5ebda026db177877">BOOL_VAR</a>(<a class="code" href="a01106.html#a9687e850f464694be20c21d93e891801">devanagari_split_debugimage</a>, 0,
138
<a name="l00036"></a><a class="code" href="a01107.html#a9687e850f464694be20c21d93e891801">00036</a> <span class="stringliteral">"Whether to create a debug image for split shiro-rekha process."</span>);
139
<a name="l00037"></a>00037
140
<a name="l00038"></a>00038 <span class="keyword">namespace </span><a class="code" href="a01266.html#afed58feacb84df2de88bdd613cfdba6d">tesseract</a> {
141
<a name="l00039"></a>00039
142
<a name="l00040"></a><a class="code" href="a00545.html#a09814382ca566884157cceab9076fff2">00040</a> <a class="code" href="a00545.html#a09814382ca566884157cceab9076fff2">ShiroRekhaSplitter::ShiroRekhaSplitter</a>() {
143
<a name="l00041"></a>00041 orig_pix_ = NULL;
144
<a name="l00042"></a>00042 segmentation_block_list_ = NULL;
145
<a name="l00043"></a>00043 splitted_image_ = NULL;
146
<a name="l00044"></a>00044 global_xheight_ = <a class="code" href="a00545.html#ac973904ee08ed3d33aa15afc9dc2a903">kUnspecifiedXheight</a>;
147
<a name="l00045"></a>00045 perform_close_ = <span class="keyword">false</span>;
148
<a name="l00046"></a>00046 debug_image_ = NULL;
149
<a name="l00047"></a>00047 pageseg_split_strategy_ = <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601a1ca815839c8e78def404b329ba79697a">NO_SPLIT</a>;
150
<a name="l00048"></a>00048 ocr_split_strategy_ = <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601a1ca815839c8e78def404b329ba79697a">NO_SPLIT</a>;
151
<a name="l00049"></a>00049 }
152
<a name="l00050"></a>00050
153
<a name="l00051"></a><a class="code" href="a00545.html#a018fa239787df6051031ac4627e442cb">00051</a> <a class="code" href="a00545.html#a018fa239787df6051031ac4627e442cb">ShiroRekhaSplitter::~ShiroRekhaSplitter</a>() {
154
<a name="l00052"></a>00052 <a class="code" href="a00545.html#a8bfcc88be2d166b396f760d10ae29f18">Clear</a>();
155
<a name="l00053"></a>00053 }
156
<a name="l00054"></a>00054
157
<a name="l00055"></a><a class="code" href="a00545.html#a8bfcc88be2d166b396f760d10ae29f18">00055</a> <span class="keywordtype">void</span> <a class="code" href="a00545.html#a8bfcc88be2d166b396f760d10ae29f18">ShiroRekhaSplitter::Clear</a>() {
158
<a name="l00056"></a>00056 pixDestroy(&orig_pix_);
159
<a name="l00057"></a>00057 pixDestroy(&splitted_image_);
160
<a name="l00058"></a>00058 pageseg_split_strategy_ = <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601a1ca815839c8e78def404b329ba79697a">NO_SPLIT</a>;
161
<a name="l00059"></a>00059 ocr_split_strategy_ = <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601a1ca815839c8e78def404b329ba79697a">NO_SPLIT</a>;
162
<a name="l00060"></a>00060 pixDestroy(&debug_image_);
163
<a name="l00061"></a>00061 segmentation_block_list_ = NULL;
164
<a name="l00062"></a>00062 global_xheight_ = <a class="code" href="a00545.html#ac973904ee08ed3d33aa15afc9dc2a903">kUnspecifiedXheight</a>;
165
<a name="l00063"></a>00063 perform_close_ = <span class="keyword">false</span>;
166
<a name="l00064"></a>00064 }
167
<a name="l00065"></a>00065
168
<a name="l00066"></a>00066 <span class="comment">// This method dumps a debug image to the specified location.</span>
169
<a name="l00067"></a><a class="code" href="a00545.html#ac60692d8c95f1ed1505adbd2554ece53">00067</a> <span class="keywordtype">void</span> <a class="code" href="a00545.html#ac60692d8c95f1ed1505adbd2554ece53">ShiroRekhaSplitter::DumpDebugImage</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="a01266.html#a61c02c0afc996e6b9c619f0a757af50b">filename</a>)<span class="keyword"> const </span>{
170
<a name="l00068"></a>00068 pixWrite(filename, debug_image_, IFF_PNG);
171
<a name="l00069"></a>00069 }
172
<a name="l00070"></a>00070
173
<a name="l00071"></a>00071 <span class="comment">// On setting the input image, a clone of it is owned by this class.</span>
174
<a name="l00072"></a><a class="code" href="a00545.html#aef511d3502b7ea23cde356ef6454f064">00072</a> <span class="keywordtype">void</span> <a class="code" href="a00545.html#aef511d3502b7ea23cde356ef6454f064">ShiroRekhaSplitter::set_orig_pix</a>(Pix* pix) {
175
<a name="l00073"></a>00073 <span class="keywordflow">if</span> (orig_pix_) {
176
<a name="l00074"></a>00074 pixDestroy(&orig_pix_);
177
<a name="l00075"></a>00075 }
178
<a name="l00076"></a>00076 orig_pix_ = pixClone(pix);
179
<a name="l00077"></a>00077 }
180
<a name="l00078"></a>00078
181
<a name="l00079"></a>00079 <span class="comment">// Top-level method to perform splitting based on current settings.</span>
182
<a name="l00080"></a>00080 <span class="comment">// Returns true if a split was actually performed.</span>
183
<a name="l00081"></a>00081 <span class="comment">// split_for_pageseg should be true if the splitting is being done prior to</span>
184
<a name="l00082"></a>00082 <span class="comment">// page segmentation. This mode uses the flag</span>
185
<a name="l00083"></a>00083 <span class="comment">// pageseg_devanagari_split_strategy to determine the splitting strategy.</span>
186
<a name="l00084"></a><a class="code" href="a00545.html#a28e6f7d06927c5742be73589cb3eefcf">00084</a> <span class="keywordtype">bool</span> <a class="code" href="a00545.html#a28e6f7d06927c5742be73589cb3eefcf">ShiroRekhaSplitter::Split</a>(<span class="keywordtype">bool</span> split_for_pageseg) {
187
<a name="l00085"></a>00085 <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601">SplitStrategy</a> split_strategy = split_for_pageseg ? pageseg_split_strategy_ :
188
<a name="l00086"></a>00086 ocr_split_strategy_;
189
<a name="l00087"></a>00087 <span class="keywordflow">if</span> (split_strategy == <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601a1ca815839c8e78def404b329ba79697a">NO_SPLIT</a>) {
190
<a name="l00088"></a>00088 <span class="keywordflow">return</span> <span class="keyword">false</span>; <span class="comment">// Nothing to do.</span>
191
<a name="l00089"></a>00089 }
192
<a name="l00090"></a>00090 <a class="code" href="a00823.html#a93a603f4063a6b9403d81caa245a583b">ASSERT_HOST</a>(split_strategy == <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601abb20813b04f412bb19593e228c343503">MINIMAL_SPLIT</a> ||
193
<a name="l00091"></a>00091 split_strategy == <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601a8835ad2cdb469808d2aa1d4c8546426c">MAXIMAL_SPLIT</a>);
194
<a name="l00092"></a>00092 <a class="code" href="a00823.html#a93a603f4063a6b9403d81caa245a583b">ASSERT_HOST</a>(orig_pix_);
195
<a name="l00093"></a>00093 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a> > 0) {
196
<a name="l00094"></a>00094 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"Splitting shiro-rekha ...\n"</span>);
197
<a name="l00095"></a>00095 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"Split strategy = %s\n"</span>,
198
<a name="l00096"></a>00096 split_strategy == <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601abb20813b04f412bb19593e228c343503">MINIMAL_SPLIT</a> ? <span class="stringliteral">"Minimal"</span> : <span class="stringliteral">"Maximal"</span>);
199
<a name="l00097"></a>00097 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"Initial pageseg available = %s\n"</span>,
200
<a name="l00098"></a>00098 segmentation_block_list_ ? <span class="stringliteral">"yes"</span> : <span class="stringliteral">"no"</span>);
201
<a name="l00099"></a>00099 }
202
<a name="l00100"></a>00100 <span class="comment">// Create a copy of original image to store the splitting output.</span>
203
<a name="l00101"></a>00101 pixDestroy(&splitted_image_);
204
<a name="l00102"></a>00102 splitted_image_ = pixCopy(NULL, orig_pix_);
205
<a name="l00103"></a>00103
206
<a name="l00104"></a>00104 <span class="comment">// Initialize debug image if required.</span>
207
<a name="l00105"></a>00105 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#a9687e850f464694be20c21d93e891801">devanagari_split_debugimage</a>) {
208
<a name="l00106"></a>00106 pixDestroy(&debug_image_);
209
<a name="l00107"></a>00107 debug_image_ = pixConvertTo32(orig_pix_);
210
<a name="l00108"></a>00108 }
211
<a name="l00109"></a>00109
212
<a name="l00110"></a>00110 <span class="comment">// Determine all connected components in the input image. A close operation</span>
213
<a name="l00111"></a>00111 <span class="comment">// may be required prior to this, depending on the current settings.</span>
214
<a name="l00112"></a>00112 Pix* pix_for_ccs = pixClone(orig_pix_);
215
<a name="l00113"></a>00113 <span class="keywordflow">if</span> (perform_close_ && global_xheight_ != <a class="code" href="a00545.html#ac973904ee08ed3d33aa15afc9dc2a903">kUnspecifiedXheight</a> &&
216
<a name="l00114"></a>00114 !segmentation_block_list_) {
217
<a name="l00115"></a>00115 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a> > 0) {
218
<a name="l00116"></a>00116 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"Performing a global close operation..\n"</span>);
219
<a name="l00117"></a>00117 }
220
<a name="l00118"></a>00118 <span class="comment">// A global measure is available for xheight, but no local information</span>
221
<a name="l00119"></a>00119 <span class="comment">// exists.</span>
222
<a name="l00120"></a>00120 pixDestroy(&pix_for_ccs);
223
<a name="l00121"></a>00121 pix_for_ccs = pixCopy(NULL, orig_pix_);
224
<a name="l00122"></a>00122 PerformClose(pix_for_ccs, global_xheight_);
225
<a name="l00123"></a>00123 }
226
<a name="l00124"></a>00124 Pixa* ccs;
227
<a name="l00125"></a>00125 Boxa* tmp_boxa = pixConnComp(pix_for_ccs, &ccs, 8);
228
<a name="l00126"></a>00126 boxaDestroy(&tmp_boxa);
229
<a name="l00127"></a>00127 pixDestroy(&pix_for_ccs);
230
<a name="l00128"></a>00128
231
<a name="l00129"></a>00129 <span class="comment">// Iterate over all connected components. Get their bounding boxes and clip</span>
232
<a name="l00130"></a>00130 <span class="comment">// out the image regions corresponding to these boxes from the original image.</span>
233
<a name="l00131"></a>00131 <span class="comment">// Conditionally run splitting on each of them.</span>
234
<a name="l00132"></a>00132 Boxa* regions_to_clear = boxaCreate(0);
235
<a name="l00133"></a>00133 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < pixaGetCount(ccs); ++i) {
236
<a name="l00134"></a>00134 Box* box = ccs->boxa->box[i];
237
<a name="l00135"></a>00135 Pix* word_pix = pixClipRectangle(orig_pix_, box, NULL);
238
<a name="l00136"></a>00136 <a class="code" href="a00823.html#a93a603f4063a6b9403d81caa245a583b">ASSERT_HOST</a>(word_pix);
239
<a name="l00137"></a>00137 <span class="keywordtype">int</span> xheight = GetXheightForCC(box);
240
<a name="l00138"></a>00138 <span class="keywordflow">if</span> (xheight == <a class="code" href="a00545.html#ac973904ee08ed3d33aa15afc9dc2a903">kUnspecifiedXheight</a> && segmentation_block_list_ &&
241
<a name="l00139"></a>00139 <a class="code" href="a01106.html#a9687e850f464694be20c21d93e891801">devanagari_split_debugimage</a>) {
242
<a name="l00140"></a>00140 pixRenderBoxArb(debug_image_, box, 1, 255, 0, 0);
243
<a name="l00141"></a>00141 }
244
<a name="l00142"></a>00142 <span class="comment">// If some xheight measure is available, attempt to pre-eliminate small</span>
245
<a name="l00143"></a>00143 <span class="comment">// blobs from the shiro-rekha process. This is primarily to save the CCs</span>
246
<a name="l00144"></a>00144 <span class="comment">// corresponding to punctuation marks/small dots etc which are part of</span>
247
<a name="l00145"></a>00145 <span class="comment">// larger graphemes.</span>
248
<a name="l00146"></a>00146 <span class="keywordflow">if</span> (xheight == <a class="code" href="a00545.html#ac973904ee08ed3d33aa15afc9dc2a903">kUnspecifiedXheight</a> ||
249
<a name="l00147"></a>00147 (box->w > xheight / 3 && box->h > xheight / 2)) {
250
<a name="l00148"></a>00148 SplitWordShiroRekha(split_strategy, word_pix, xheight,
251
<a name="l00149"></a>00149 box->x, box->y, regions_to_clear);
252
<a name="l00150"></a>00150 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a> > 0) {
253
<a name="l00151"></a>00151 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"CC dropped from splitting: %d,%d (%d, %d)\n"</span>,
254
<a name="l00152"></a>00152 box->x, box->y, box->w, box->h);
255
<a name="l00153"></a>00153 }
256
<a name="l00154"></a>00154 pixDestroy(&word_pix);
257
<a name="l00155"></a>00155 }
258
<a name="l00156"></a>00156 <span class="comment">// Actually clear the boxes now.</span>
259
<a name="l00157"></a>00157 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < boxaGetCount(regions_to_clear); ++i) {
260
<a name="l00158"></a>00158 Box* box = boxaGetBox(regions_to_clear, i, L_CLONE);
261
<a name="l00159"></a>00159 pixClearInRect(splitted_image_, box);
262
<a name="l00160"></a>00160 boxDestroy(&box);
263
<a name="l00161"></a>00161 }
264
<a name="l00162"></a>00162 boxaDestroy(&regions_to_clear);
265
<a name="l00163"></a>00163 pixaDestroy(&ccs);
266
<a name="l00164"></a>00164 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#a9687e850f464694be20c21d93e891801">devanagari_split_debugimage</a>) {
267
<a name="l00165"></a>00165 <a class="code" href="a00545.html#ac60692d8c95f1ed1505adbd2554ece53">DumpDebugImage</a>(split_for_pageseg ? <span class="stringliteral">"pageseg_split_debug.png"</span> :
268
<a name="l00166"></a>00166 <span class="stringliteral">"ocr_split_debug.png"</span>);
269
<a name="l00167"></a>00167 }
270
<a name="l00168"></a>00168 <span class="keywordflow">return</span> <span class="keyword">true</span>;
271
<a name="l00169"></a>00169 }
272
<a name="l00170"></a>00170
273
<a name="l00171"></a>00171 <span class="comment">// Method to perform a close operation on the input image. The xheight</span>
274
<a name="l00172"></a>00172 <span class="comment">// estimate decides the size of sel used.</span>
275
<a name="l00173"></a>00173 <span class="keywordtype">void</span> ShiroRekhaSplitter::PerformClose(Pix* pix, <span class="keywordtype">int</span> xheight_estimate) {
276
<a name="l00174"></a>00174 pixCloseBrick(pix, pix, xheight_estimate / 8, xheight_estimate / 3);
277
<a name="l00175"></a>00175 }
278
<a name="l00176"></a>00176
279
<a name="l00177"></a>00177 <span class="comment">// This method resolves the cc bbox to a particular row and returns the row's</span>
280
<a name="l00178"></a>00178 <span class="comment">// xheight.</span>
281
<a name="l00179"></a>00179 <span class="keywordtype">int</span> ShiroRekhaSplitter::GetXheightForCC(Box* cc_bbox) {
282
<a name="l00180"></a>00180 <span class="keywordflow">if</span> (!segmentation_block_list_) {
283
<a name="l00181"></a>00181 <span class="keywordflow">return</span> global_xheight_;
284
<a name="l00182"></a>00182 }
285
<a name="l00183"></a>00183 <span class="comment">// Compute the box coordinates in Tesseract's coordinate system.</span>
286
<a name="l00184"></a>00184 <a class="code" href="a00592.html">TBOX</a> bbox(cc_bbox->x,
287
<a name="l00185"></a>00185 pixGetHeight(orig_pix_) - cc_bbox->y - cc_bbox->h - 1,
288
<a name="l00186"></a>00186 cc_bbox->x + cc_bbox->w,
289
<a name="l00187"></a>00187 pixGetHeight(orig_pix_) - cc_bbox->y - 1);
290
<a name="l00188"></a>00188 <span class="comment">// Iterate over all blocks.</span>
291
<a name="l00189"></a>00189 BLOCK_IT block_it(segmentation_block_list_);
292
<a name="l00190"></a>00190 <span class="keywordflow">for</span> (block_it.mark_cycle_pt(); !block_it.cycled_list(); block_it.forward()) {
293
<a name="l00191"></a>00191 <a class="code" href="a00280.html">BLOCK</a>* block = block_it.data();
294
<a name="l00192"></a>00192 <span class="comment">// Iterate over all rows in the block.</span>
295
<a name="l00193"></a>00193 ROW_IT row_it(block-><a class="code" href="a00280.html#ae9826e422b0bf17a7592dee8db3fe058" title="get rows">row_list</a>());
296
<a name="l00194"></a>00194 <span class="keywordflow">for</span> (row_it.mark_cycle_pt(); !row_it.cycled_list(); row_it.forward()) {
297
<a name="l00195"></a>00195 <a class="code" href="a00521.html">ROW</a>* row = row_it.data();
298
<a name="l00196"></a>00196 <span class="keywordflow">if</span> (!row-><a class="code" href="a00521.html#a7bb838e55056e39e15d7e2cea8ebebb0">bounding_box</a>().<a class="code" href="a00592.html#aeabe87a0ee3912ca63550ffee4fb4115">major_overlap</a>(bbox)) {
299
<a name="l00197"></a>00197 <span class="keywordflow">continue</span>;
300
<a name="l00198"></a>00198 }
301
<a name="l00199"></a>00199 <span class="comment">// Row could be skewed, warped, etc. Use the position of the box to</span>
302
<a name="l00200"></a>00200 <span class="comment">// determine the baseline position of the row for that x-coordinate.</span>
303
<a name="l00201"></a>00201 <span class="comment">// Create a square TBOX whose baseline's mid-point lies at this point</span>
304
<a name="l00202"></a>00202 <span class="comment">// and side is row's xheight. Take the overlap of this box with the input</span>
305
<a name="l00203"></a>00203 <span class="comment">// box and check if it is a 'major overlap'. If so, this box lies in this</span>
306
<a name="l00204"></a>00204 <span class="comment">// row. In that case, return the xheight for this row.</span>
307
<a name="l00205"></a>00205 <span class="keywordtype">float</span> box_middle = 0.5 * (bbox.left() + bbox.right());
308
<a name="l00206"></a>00206 <span class="keywordtype">int</span> <a class="code" href="a00921.html#a2a4b69f9a2827dc98bc4cbc233118865a83297de004f4e58b9be2108c6cd08a23">baseline</a> = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(row-><a class="code" href="a00521.html#a097b3543fa3ca5768eb50033d4c4db9c">base_line</a>(box_middle) + 0.5);
309
<a name="l00207"></a>00207 <a class="code" href="a00592.html">TBOX</a> test_box(box_middle - row-><a class="code" href="a00521.html#a2954f94ec4eefe1e3729912e5b8ea779">x_height</a>() / 2,
310
<a name="l00208"></a>00208 <a class="code" href="a00921.html#a2a4b69f9a2827dc98bc4cbc233118865a83297de004f4e58b9be2108c6cd08a23">baseline</a>,
311
<a name="l00209"></a>00209 box_middle + row-><a class="code" href="a00521.html#a2954f94ec4eefe1e3729912e5b8ea779">x_height</a>() / 2,
312
<a name="l00210"></a>00210 <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(baseline + row-><a class="code" href="a00521.html#a2954f94ec4eefe1e3729912e5b8ea779">x_height</a>()));
313
<a name="l00211"></a>00211 <span class="comment">// Compute overlap. If it is is a major overlap, this is the right row.</span>
314
<a name="l00212"></a>00212 <span class="keywordflow">if</span> (bbox.major_overlap(test_box)) {
315
<a name="l00213"></a>00213 <span class="keywordflow">return</span> row-><a class="code" href="a00521.html#a2954f94ec4eefe1e3729912e5b8ea779">x_height</a>();
316
<a name="l00214"></a>00214 }
317
<a name="l00215"></a>00215 }
318
<a name="l00216"></a>00216 }
319
<a name="l00217"></a>00217 <span class="comment">// No row found for this bbox.</span>
320
<a name="l00218"></a>00218 <span class="keywordflow">return</span> <a class="code" href="a00545.html#ac973904ee08ed3d33aa15afc9dc2a903">kUnspecifiedXheight</a>;
321
<a name="l00219"></a>00219 }
322
<a name="l00220"></a>00220
323
<a name="l00221"></a>00221 <span class="comment">// Returns a list of regions (boxes) which should be cleared in the original</span>
324
<a name="l00222"></a>00222 <span class="comment">// image so as to perform shiro-rekha splitting. Pix is assumed to carry one</span>
325
<a name="l00223"></a>00223 <span class="comment">// (or less) word only. Xheight measure could be the global estimate, the row</span>
326
<a name="l00224"></a>00224 <span class="comment">// estimate, or unspecified. If unspecified, over splitting may occur, since a</span>
327
<a name="l00225"></a>00225 <span class="comment">// conservative estimate of stroke width along with an associated multiplier</span>
328
<a name="l00226"></a>00226 <span class="comment">// is used in its place. It is advisable to have a specified xheight when</span>
329
<a name="l00227"></a>00227 <span class="comment">// splitting for classification/training.</span>
330
<a name="l00228"></a>00228 <span class="comment">// A vertical projection histogram of all the on-pixels in the input pix is</span>
331
<a name="l00229"></a>00229 <span class="comment">// computed. The maxima of this histogram is regarded as an approximate location</span>
332
<a name="l00230"></a>00230 <span class="comment">// of the shiro-rekha. By descending on the maxima's peak on both sides,</span>
333
<a name="l00231"></a>00231 <span class="comment">// stroke width of shiro-rekha is estimated.</span>
334
<a name="l00232"></a>00232 <span class="comment">// A horizontal projection histogram is computed for a sub-image of the input</span>
335
<a name="l00233"></a>00233 <span class="comment">// image, which extends from just below the shiro-rekha down to a certain</span>
336
<a name="l00234"></a>00234 <span class="comment">// leeway. The leeway depends on the input xheight, if provided, else a</span>
337
<a name="l00235"></a>00235 <span class="comment">// conservative multiplier on approximate stroke width is used (which may lead</span>
338
<a name="l00236"></a>00236 <span class="comment">// to over-splitting).</span>
339
<a name="l00237"></a>00237 <span class="keywordtype">void</span> ShiroRekhaSplitter::SplitWordShiroRekha(SplitStrategy split_strategy,
340
<a name="l00238"></a>00238 Pix* pix,
341
<a name="l00239"></a>00239 <span class="keywordtype">int</span> xheight,
342
<a name="l00240"></a>00240 <span class="keywordtype">int</span> word_left,
343
<a name="l00241"></a>00241 <span class="keywordtype">int</span> word_top,
344
<a name="l00242"></a>00242 Boxa* regions_to_clear) {
345
<a name="l00243"></a>00243 <span class="keywordflow">if</span> (split_strategy == <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601a1ca815839c8e78def404b329ba79697a">NO_SPLIT</a>) {
346
<a name="l00244"></a>00244 <span class="keywordflow">return</span>;
347
<a name="l00245"></a>00245 }
348
<a name="l00246"></a>00246 <span class="keywordtype">int</span> width = pixGetWidth(pix);
349
<a name="l00247"></a>00247 <span class="keywordtype">int</span> height = pixGetHeight(pix);
350
<a name="l00248"></a>00248 <span class="comment">// Statistically determine the yextents of the shiro-rekha.</span>
351
<a name="l00249"></a>00249 <span class="keywordtype">int</span> shirorekha_top, shirorekha_bottom, shirorekha_ylevel;
352
<a name="l00250"></a>00250 GetShiroRekhaYExtents(pix, &shirorekha_top, &shirorekha_bottom,
353
<a name="l00251"></a>00251 &shirorekha_ylevel);
354
<a name="l00252"></a>00252 <span class="comment">// Since the shiro rekha is also a stroke, its width is equal to the stroke</span>
355
<a name="l00253"></a>00253 <span class="comment">// width.</span>
356
<a name="l00254"></a>00254 <span class="keywordtype">int</span> stroke_width = shirorekha_bottom - shirorekha_top + 1;
357
<a name="l00255"></a>00255
358
<a name="l00256"></a>00256 <span class="comment">// Some safeguards to protect CCs we do not want to be split.</span>
359
<a name="l00257"></a>00257 <span class="comment">// These are particularly useful when the word wasn't eliminated earlier</span>
360
<a name="l00258"></a>00258 <span class="comment">// because xheight information was unavailable.</span>
361
<a name="l00259"></a>00259 <span class="keywordflow">if</span> (shirorekha_ylevel > height / 2) {
362
<a name="l00260"></a>00260 <span class="comment">// Shirorekha shouldn't be in the bottom half of the word.</span>
363
<a name="l00261"></a>00261 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a> > 0) {
364
<a name="l00262"></a>00262 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"Skipping splitting CC at (%d, %d): shirorekha in lower half..\n"</span>,
365
<a name="l00263"></a>00263 word_left, word_top);
366
<a name="l00264"></a>00264 }
367
<a name="l00265"></a>00265 <span class="keywordflow">return</span>;
368
<a name="l00266"></a>00266 }
369
<a name="l00267"></a>00267 <span class="keywordflow">if</span> (stroke_width > height / 3) {
370
<a name="l00268"></a>00268 <span class="comment">// Even the boldest of fonts shouldn't do this.</span>
371
<a name="l00269"></a>00269 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a> > 0) {
372
<a name="l00270"></a>00270 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"Skipping splitting CC at (%d, %d): stroke width too huge..\n"</span>,
373
<a name="l00271"></a>00271 word_left, word_top);
374
<a name="l00272"></a>00272 }
375
<a name="l00273"></a>00273 <span class="keywordflow">return</span>;
376
<a name="l00274"></a>00274 }
377
<a name="l00275"></a>00275
378
<a name="l00276"></a>00276 <span class="comment">// Clear the ascender and descender regions of the word.</span>
379
<a name="l00277"></a>00277 <span class="comment">// Obtain a vertical projection histogram for the resulting image.</span>
380
<a name="l00278"></a>00278 Box* box_to_clear = boxCreate(0, shirorekha_top - stroke_width / 3,
381
<a name="l00279"></a>00279 width, 5 * stroke_width / 3);
382
<a name="l00280"></a>00280 Pix* word_in_xheight = pixCopy(NULL, pix);
383
<a name="l00281"></a>00281 pixClearInRect(word_in_xheight, box_to_clear);
384
<a name="l00282"></a>00282 <span class="comment">// Also clear any pixels which are below shirorekha_bottom + some leeway.</span>
385
<a name="l00283"></a>00283 <span class="comment">// The leeway is set to xheight if the information is available, else it is a</span>
386
<a name="l00284"></a>00284 <span class="comment">// multiplier applied to the stroke width.</span>
387
<a name="l00285"></a>00285 <span class="keywordtype">int</span> leeway_to_keep = stroke_width * 3;
388
<a name="l00286"></a>00286 <span class="keywordflow">if</span> (xheight != <a class="code" href="a00545.html#ac973904ee08ed3d33aa15afc9dc2a903">kUnspecifiedXheight</a>) {
389
<a name="l00287"></a>00287 <span class="comment">// This is because the xheight-region typically includes the shiro-rekha</span>
390
<a name="l00288"></a>00288 <span class="comment">// inside it, i.e., the top of the xheight range corresponds to the top of</span>
391
<a name="l00289"></a>00289 <span class="comment">// shiro-rekha.</span>
392
<a name="l00290"></a>00290 leeway_to_keep = xheight - stroke_width;
393
<a name="l00291"></a>00291 }
394
<a name="l00292"></a>00292 box_to_clear->y = shirorekha_bottom + leeway_to_keep;
395
<a name="l00293"></a>00293 box_to_clear->h = height - box_to_clear->y;
396
<a name="l00294"></a>00294 pixClearInRect(word_in_xheight, box_to_clear);
397
<a name="l00295"></a>00295 boxDestroy(&box_to_clear);
398
<a name="l00296"></a>00296
399
<a name="l00297"></a>00297 PixelHistogram vert_hist;
400
<a name="l00298"></a>00298 vert_hist.ConstructVerticalCountHist(word_in_xheight);
401
<a name="l00299"></a>00299 pixDestroy(&word_in_xheight);
402
<a name="l00300"></a>00300
403
<a name="l00301"></a>00301 <span class="comment">// If the number of black pixel in any column of the image is less than a</span>
404
<a name="l00302"></a>00302 <span class="comment">// fraction of the stroke width, treat it as noise / a stray mark. Perform</span>
405
<a name="l00303"></a>00303 <span class="comment">// these changes inside the vert_hist data itself, as that is used later on as</span>
406
<a name="l00304"></a>00304 <span class="comment">// a bit vector for the final split decision at every column.</span>
407
<a name="l00305"></a>00305 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < width; ++i) {
408
<a name="l00306"></a>00306 <span class="keywordflow">if</span> (vert_hist.hist()[i] <= stroke_width / 4)
409
<a name="l00307"></a>00307 vert_hist.hist()[i] = 0;
410
<a name="l00308"></a>00308 <span class="keywordflow">else</span>
411
<a name="l00309"></a>00309 vert_hist.hist()[i] = 1;
412
<a name="l00310"></a>00310 }
413
<a name="l00311"></a>00311 <span class="comment">// In order to split the line at any point, we make sure that the width of the</span>
414
<a name="l00312"></a>00312 <span class="comment">// gap is atleast half the stroke width.</span>
415
<a name="l00313"></a>00313 <span class="keywordtype">int</span> i = 0;
416
<a name="l00314"></a>00314 <span class="keywordtype">int</span> cur_component_width = 0;
417
<a name="l00315"></a>00315 <span class="keywordflow">while</span> (i < width) {
418
<a name="l00316"></a>00316 <span class="keywordflow">if</span> (!vert_hist.hist()[i]) {
419
<a name="l00317"></a>00317 <span class="keywordtype">int</span> j = 0;
420
<a name="l00318"></a>00318 <span class="keywordflow">while</span> (i + j < width && !vert_hist.hist()[i+j])
421
<a name="l00319"></a>00319 ++j;
422
<a name="l00320"></a>00320 <span class="keywordflow">if</span> (j >= stroke_width / 2 && cur_component_width >= stroke_width / 2) {
423
<a name="l00321"></a>00321 <span class="comment">// Perform a shiro-rekha split. The intervening region lies from i to</span>
424
<a name="l00322"></a>00322 <span class="comment">// i+j-1.</span>
425
<a name="l00323"></a>00323 <span class="comment">// A minimal single-pixel split makes the estimation of intra- and</span>
426
<a name="l00324"></a>00324 <span class="comment">// inter-word spacing easier during page layout analysis,</span>
427
<a name="l00325"></a>00325 <span class="comment">// whereas a maximal split may be needed for OCR, depending on</span>
428
<a name="l00326"></a>00326 <span class="comment">// how the engine was trained.</span>
429
<a name="l00327"></a>00327 <span class="keywordtype">bool</span> minimal_split = (split_strategy == <a class="code" href="a00545.html#ab44f3b6e26668478841a5b8c45332601abb20813b04f412bb19593e228c343503">MINIMAL_SPLIT</a>);
430
<a name="l00328"></a>00328 <span class="keywordtype">int</span> split_width = minimal_split ? 1 : j;
431
<a name="l00329"></a>00329 <span class="keywordtype">int</span> split_left = minimal_split ? i + (j / 2) - (split_width / 2) : i;
432
<a name="l00330"></a>00330 <span class="keywordflow">if</span> (!minimal_split || (i != 0 && i + j != width)) {
433
<a name="l00331"></a>00331 Box* box_to_clear =
434
<a name="l00332"></a>00332 boxCreate(word_left + split_left,
435
<a name="l00333"></a>00333 word_top + shirorekha_top - stroke_width / 3,
436
<a name="l00334"></a>00334 split_width,
437
<a name="l00335"></a>00335 5 * stroke_width / 3);
438
<a name="l00336"></a>00336 <span class="keywordflow">if</span> (box_to_clear) {
439
<a name="l00337"></a>00337 boxaAddBox(regions_to_clear, box_to_clear, L_CLONE);
440
<a name="l00338"></a>00338 <span class="comment">// Mark this in the debug image if needed.</span>
441
<a name="l00339"></a>00339 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#a9687e850f464694be20c21d93e891801">devanagari_split_debugimage</a>) {
442
<a name="l00340"></a>00340 pixRenderBoxArb(debug_image_, box_to_clear, 1, 128, 255, 128);
443
<a name="l00341"></a>00341 }
444
<a name="l00342"></a>00342 boxDestroy(&box_to_clear);
445
<a name="l00343"></a>00343 cur_component_width = 0;
446
<a name="l00344"></a>00344 }
447
<a name="l00345"></a>00345 }
448
<a name="l00346"></a>00346 }
449
<a name="l00347"></a>00347 i += j;
450
<a name="l00348"></a>00348 } <span class="keywordflow">else</span> {
451
<a name="l00349"></a>00349 ++i;
452
<a name="l00350"></a>00350 ++cur_component_width;
453
<a name="l00351"></a>00351 }
454
<a name="l00352"></a>00352 }
455
<a name="l00353"></a>00353 }
456
<a name="l00354"></a>00354
457
<a name="l00355"></a>00355 <span class="comment">// Refreshes the words in the segmentation block list by using blobs in the</span>
458
<a name="l00356"></a>00356 <span class="comment">// input block list.</span>
459
<a name="l00357"></a>00357 <span class="comment">// The segmentation block list must be set.</span>
460
<a name="l00358"></a><a class="code" href="a00545.html#a90146104b2c9a136fdd873036cb95230">00358</a> <span class="keywordtype">void</span> <a class="code" href="a00545.html#a90146104b2c9a136fdd873036cb95230">ShiroRekhaSplitter::RefreshSegmentationWithNewBlobs</a>(
461
<a name="l00359"></a>00359 C_BLOB_LIST* new_blobs) {
462
<a name="l00360"></a>00360 <span class="comment">// The segmentation block list must have been specified.</span>
463
<a name="l00361"></a>00361 <a class="code" href="a00823.html#a93a603f4063a6b9403d81caa245a583b">ASSERT_HOST</a>(segmentation_block_list_);
464
<a name="l00362"></a>00362 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a> > 0) {
465
<a name="l00363"></a>00363 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"Before refreshing blobs:\n"</span>);
466
<a name="l00364"></a>00364 <a class="code" href="a00760.html#a7f48b20c8959347726c816b94b3c47f5">PrintSegmentationStats</a>(segmentation_block_list_);
467
<a name="l00365"></a>00365 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"New Blobs found: %d\n"</span>, new_blobs->length());
468
<a name="l00366"></a>00366 }
469
<a name="l00367"></a>00367
470
<a name="l00368"></a>00368 C_BLOB_LIST not_found_blobs;
471
<a name="l00369"></a>00369 <a class="code" href="a00760.html#af0a18fdb19dd9d4ebe9e73b864c2fad5">RefreshWordBlobsFromNewBlobs</a>(segmentation_block_list_,
472
<a name="l00370"></a>00370 new_blobs,
473
<a name="l00371"></a>00371 ((<a class="code" href="a01106.html#a9687e850f464694be20c21d93e891801">devanagari_split_debugimage</a> && debug_image_) ?
474
<a name="l00372"></a>00372 &not_found_blobs : NULL));
475
<a name="l00373"></a>00373
476
<a name="l00374"></a>00374 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#ad6b4d3ded1df0799766c874662d63050">devanagari_split_debuglevel</a> > 0) {
477
<a name="l00375"></a>00375 <a class="code" href="a00860.html#a02aa7cca2c3857c14716e8cca96ace6c">tprintf</a>(<span class="stringliteral">"After refreshing blobs:\n"</span>);
478
<a name="l00376"></a>00376 <a class="code" href="a00760.html#a7f48b20c8959347726c816b94b3c47f5">PrintSegmentationStats</a>(segmentation_block_list_);
479
<a name="l00377"></a>00377 }
480
<a name="l00378"></a>00378 <span class="keywordflow">if</span> (<a class="code" href="a01106.html#a9687e850f464694be20c21d93e891801">devanagari_split_debugimage</a> && debug_image_) {
481
<a name="l00379"></a>00379 <span class="comment">// Plot out the original blobs for which no match was found in the new</span>
482
<a name="l00380"></a>00380 <span class="comment">// all_blobs list.</span>
483
<a name="l00381"></a>00381 C_BLOB_IT not_found_it(&not_found_blobs);
484
<a name="l00382"></a>00382 <span class="keywordflow">for</span> (not_found_it.mark_cycle_pt(); !not_found_it.cycled_list();
485
<a name="l00383"></a>00383 not_found_it.forward()) {
486
<a name="l00384"></a>00384 <a class="code" href="a00289.html">C_BLOB</a>* not_found = not_found_it.data();
487
<a name="l00385"></a>00385 <a class="code" href="a00592.html">TBOX</a> not_found_box = not_found-><a class="code" href="a00289.html#a77e52e29e2c622a3a63bb7edb110f6ab">bounding_box</a>();
488
<a name="l00386"></a>00386 Box* box_to_plot = GetBoxForTBOX(not_found_box);
489
<a name="l00387"></a>00387 pixRenderBoxArb(debug_image_, box_to_plot, 1, 255, 0, 255);
490
<a name="l00388"></a>00388 boxDestroy(&box_to_plot);
491
<a name="l00389"></a>00389 }
492
<a name="l00390"></a>00390
493
<a name="l00391"></a>00391 <span class="comment">// Plot out the blobs unused from all blobs.</span>
494
<a name="l00392"></a>00392 C_BLOB_IT all_blobs_it(new_blobs);
495
<a name="l00393"></a>00393 <span class="keywordflow">for</span> (all_blobs_it.mark_cycle_pt(); !all_blobs_it.cycled_list();
496
<a name="l00394"></a>00394 all_blobs_it.forward()) {
497
<a name="l00395"></a>00395 <a class="code" href="a00289.html">C_BLOB</a>* a_blob = all_blobs_it.data();
498
<a name="l00396"></a>00396 Box* box_to_plot = GetBoxForTBOX(a_blob-><a class="code" href="a00289.html#a77e52e29e2c622a3a63bb7edb110f6ab">bounding_box</a>());
499
<a name="l00397"></a>00397 pixRenderBoxArb(debug_image_, box_to_plot, 3, 0, 127, 0);
500
<a name="l00398"></a>00398 boxDestroy(&box_to_plot);
501
<a name="l00399"></a>00399 }
502
<a name="l00400"></a>00400 }
503
<a name="l00401"></a>00401 }
504
<a name="l00402"></a>00402
505
<a name="l00403"></a>00403 <span class="comment">// Returns a new box object for the corresponding TBOX, based on the original</span>
506
<a name="l00404"></a>00404 <span class="comment">// image's coordinate system.</span>
507
<a name="l00405"></a>00405 Box* ShiroRekhaSplitter::GetBoxForTBOX(<span class="keyword">const</span> <a class="code" href="a00592.html">TBOX</a>& tbox)<span class="keyword"> const </span>{
508
<a name="l00406"></a>00406 <span class="keywordflow">return</span> boxCreate(tbox.<a class="code" href="a00592.html#a724fabf566586b663577dfa944ffbc61">left</a>(), pixGetHeight(orig_pix_) - tbox.<a class="code" href="a00592.html#adf92e9fdac1bdf11c10d1c4d1178791a">top</a>() - 1,
509
<a name="l00407"></a>00407 tbox.<a class="code" href="a00592.html#af95494a2ccacc70cc2b83820b2948619">width</a>(), tbox.<a class="code" href="a00592.html#a8379d4bbc72bdbb1f069fc14790e632d">height</a>());
510
<a name="l00408"></a>00408 }
511
<a name="l00409"></a>00409
512
<a name="l00410"></a>00410 <span class="comment">// This method returns the computed mode-height of blobs in the pix.</span>
513
<a name="l00411"></a>00411 <span class="comment">// It also prunes very small blobs from calculation.</span>
514
<a name="l00412"></a><a class="code" href="a00545.html#a99f3f8f96a8b7bfe08ce2b19c8052a6c">00412</a> <span class="keywordtype">int</span> <a class="code" href="a00545.html#a99f3f8f96a8b7bfe08ce2b19c8052a6c">ShiroRekhaSplitter::GetModeHeight</a>(Pix* pix) {
515
<a name="l00413"></a>00413 Boxa* boxa = pixConnComp(pix, NULL, 8);
516
<a name="l00414"></a>00414 <a class="code" href="a00556.html">STATS</a> heights(0, pixGetHeight(pix));
517
<a name="l00415"></a>00415 heights.<a class="code" href="a00556.html#a28e9fd9515ea3b35e3f66ed078e285a6">clear</a>();
518
<a name="l00416"></a>00416 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < boxaGetCount(boxa); ++i) {
519
<a name="l00417"></a>00417 Box* box = boxaGetBox(boxa, i, L_CLONE);
520
<a name="l00418"></a>00418 <span class="keywordflow">if</span> (box->h >= 3 || box->w >= 3) {
521
<a name="l00419"></a>00419 heights.<a class="code" href="a00556.html#ab8cacba14df28eed1bffc4cea0b2f87f">add</a>(box->h, 1);
522
<a name="l00420"></a>00420 }
523
<a name="l00421"></a>00421 boxDestroy(&box);
524
<a name="l00422"></a>00422 }
525
<a name="l00423"></a>00423 boxaDestroy(&boxa);
526
<a name="l00424"></a>00424 <span class="keywordflow">return</span> heights.<a class="code" href="a00556.html#a5d353e951f61daf06c6582dfc106ff11">mode</a>();
527
<a name="l00425"></a>00425 }
528
<a name="l00426"></a>00426
529
<a name="l00427"></a>00427 <span class="comment">// This method returns y-extents of the shiro-rekha computed from the input</span>
530
<a name="l00428"></a>00428 <span class="comment">// word image.</span>
531
<a name="l00429"></a>00429 <span class="keywordtype">void</span> ShiroRekhaSplitter::GetShiroRekhaYExtents(Pix* word_pix,
532
<a name="l00430"></a>00430 <span class="keywordtype">int</span>* shirorekha_top,
533
<a name="l00431"></a>00431 <span class="keywordtype">int</span>* shirorekha_bottom,
534
<a name="l00432"></a>00432 <span class="keywordtype">int</span>* shirorekha_ylevel) {
535
<a name="l00433"></a>00433 <span class="comment">// Compute a histogram from projecting the word on a vertical line.</span>
536
<a name="l00434"></a>00434 <a class="code" href="a00503.html">PixelHistogram</a> hist_horiz;
537
<a name="l00435"></a>00435 hist_horiz.<a class="code" href="a00503.html#a7d423f56f2e8440301f8af11a952fade">ConstructHorizontalCountHist</a>(word_pix);
538
<a name="l00436"></a>00436 <span class="comment">// Get the ylevel where the top-line exists. This is basically the global</span>
539
<a name="l00437"></a>00437 <span class="comment">// maxima in the horizontal histogram.</span>
540
<a name="l00438"></a>00438 <span class="keywordtype">int</span> topline_onpixel_count = 0;
541
<a name="l00439"></a>00439 <span class="keywordtype">int</span> topline_ylevel = hist_horiz.<a class="code" href="a00503.html#ac984a3128e256cdc178cc33da1d81238">GetHistogramMaximum</a>(&topline_onpixel_count);
542
<a name="l00440"></a>00440
543
<a name="l00441"></a>00441 <span class="comment">// Get the upper and lower extents of the shiro rekha.</span>
544
<a name="l00442"></a>00442 <span class="keywordtype">int</span> thresh = (topline_onpixel_count * 70) / 100;
545
<a name="l00443"></a>00443 <span class="keywordtype">int</span> ulimit = topline_ylevel;
546
<a name="l00444"></a>00444 <span class="keywordtype">int</span> llimit = topline_ylevel;
547
<a name="l00445"></a>00445 <span class="keywordflow">while</span> (ulimit > 0 && hist_horiz.<a class="code" href="a00503.html#abd202025de01aaf80fa2a852d0fcb38d">hist</a>()[ulimit] >= thresh)
548
<a name="l00446"></a>00446 --ulimit;
549
<a name="l00447"></a>00447 <span class="keywordflow">while</span> (llimit < pixGetHeight(word_pix) && hist_horiz.<a class="code" href="a00503.html#abd202025de01aaf80fa2a852d0fcb38d">hist</a>()[llimit] >= thresh)
550
<a name="l00448"></a>00448 ++llimit;
551
<a name="l00449"></a>00449
552
<a name="l00450"></a>00450 <span class="keywordflow">if</span> (shirorekha_top) *shirorekha_top = ulimit;
553
<a name="l00451"></a>00451 <span class="keywordflow">if</span> (shirorekha_bottom) *shirorekha_bottom = llimit;
554
<a name="l00452"></a>00452 <span class="keywordflow">if</span> (shirorekha_ylevel) *shirorekha_ylevel = topline_ylevel;
555
<a name="l00453"></a>00453 }
556
<a name="l00454"></a>00454
557
<a name="l00455"></a>00455 <span class="comment">// This method returns the global-maxima for the histogram. The frequency of</span>
558
<a name="l00456"></a>00456 <span class="comment">// the global maxima is returned in count, if specified.</span>
559
<a name="l00457"></a><a class="code" href="a00503.html#ac984a3128e256cdc178cc33da1d81238">00457</a> <span class="keywordtype">int</span> <a class="code" href="a00503.html#ac984a3128e256cdc178cc33da1d81238">PixelHistogram::GetHistogramMaximum</a>(<span class="keywordtype">int</span>* <a class="code" href="a01042.html#acd4ea858d7133e40518e0832ff9d94b2">count</a>)<span class="keyword"> const </span>{
560
<a name="l00458"></a>00458 <span class="keywordtype">int</span> best_value = 0;
561
<a name="l00459"></a>00459 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < length_; ++i) {
562
<a name="l00460"></a>00460 <span class="keywordflow">if</span> (hist_[i] > hist_[best_value]) {
563
<a name="l00461"></a>00461 best_value = i;
564
<a name="l00462"></a>00462 }
565
<a name="l00463"></a>00463 }
566
<a name="l00464"></a>00464 <span class="keywordflow">if</span> (count) {
567
<a name="l00465"></a>00465 *count = hist_[best_value];
568
<a name="l00466"></a>00466 }
569
<a name="l00467"></a>00467 <span class="keywordflow">return</span> best_value;
570
<a name="l00468"></a>00468 }
571
<a name="l00469"></a>00469
572
<a name="l00470"></a>00470 <span class="comment">// Methods to construct histograms from images.</span>
573
<a name="l00471"></a><a class="code" href="a00503.html#ae6f0d2fd25a0a76b84e370aac7f7b58f">00471</a> <span class="keywordtype">void</span> <a class="code" href="a00503.html#ae6f0d2fd25a0a76b84e370aac7f7b58f">PixelHistogram::ConstructVerticalCountHist</a>(Pix* pix) {
574
<a name="l00472"></a>00472 <a class="code" href="a00503.html#aaa214752dc7cbb3923fcece5dff758ed">Clear</a>();
575
<a name="l00473"></a>00473 <span class="keywordtype">int</span> width = pixGetWidth(pix);
576
<a name="l00474"></a>00474 <span class="keywordtype">int</span> height = pixGetHeight(pix);
577
<a name="l00475"></a>00475 hist_ = <span class="keyword">new</span> <span class="keywordtype">int</span>[width];
578
<a name="l00476"></a>00476 length_ = width;
579
<a name="l00477"></a>00477 <span class="keywordtype">int</span> wpl = pixGetWpl(pix);
580
<a name="l00478"></a>00478 l_uint32 *data = pixGetData(pix);
581
<a name="l00479"></a>00479 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < width; ++i)
582
<a name="l00480"></a>00480 hist_[i] = 0;
583
<a name="l00481"></a>00481 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < height; ++i) {
584
<a name="l00482"></a>00482 l_uint32 *line = data + i * wpl;
585
<a name="l00483"></a>00483 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < width; ++j)
586
<a name="l00484"></a>00484 <span class="keywordflow">if</span> (GET_DATA_BIT(line, j))
587
<a name="l00485"></a>00485 ++(hist_[j]);
588
<a name="l00486"></a>00486 }
589
<a name="l00487"></a>00487 }
590
<a name="l00488"></a>00488
591
<a name="l00489"></a><a class="code" href="a00503.html#a7d423f56f2e8440301f8af11a952fade">00489</a> <span class="keywordtype">void</span> <a class="code" href="a00503.html#a7d423f56f2e8440301f8af11a952fade">PixelHistogram::ConstructHorizontalCountHist</a>(Pix* pix) {
592
<a name="l00490"></a>00490 <a class="code" href="a00503.html#aaa214752dc7cbb3923fcece5dff758ed">Clear</a>();
593
<a name="l00491"></a>00491 Numa* counts = pixCountPixelsByRow(pix, NULL);
594
<a name="l00492"></a>00492 length_ = numaGetCount(counts);
595
<a name="l00493"></a>00493 hist_ = <span class="keyword">new</span> <span class="keywordtype">int</span>[length_];
596
<a name="l00494"></a>00494 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < length_; ++i) {
597
<a name="l00495"></a>00495 l_int32 val = 0;
598
<a name="l00496"></a>00496 numaGetIValue(counts, i, &val);
599
<a name="l00497"></a>00497 hist_[i] = val;
600
<a name="l00498"></a>00498 }
601
<a name="l00499"></a>00499 numaDestroy(&counts);
602
<a name="l00500"></a>00500 }
603
<a name="l00501"></a>00501
604
<a name="l00502"></a>00502 } <span class="comment">// namespace tesseract.</span>
605
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<li class="navelem"><a class="el" href="a01106.html">devanagari_processing.cpp</a> </li>
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<li class="footer">Generated on Mon Feb 3 2014 10:59:10 for tesseract by
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.6.1 </li>
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