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/*M///////////////////////////////////////////////////////////////////////////////////////
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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// For Open Source Computer Vision Library
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// Copyright (C) 2010-2012, Institute Of Software Chinese Academy Of Science, all rights reserved.
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// Copyright (C) 2010-2012, Advanced Micro Devices, Inc., all rights reserved.
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// Third party copyrights are property of their respective owners.
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// Shengen Yan,yanshengen@gmail.com
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * The name of the copyright holders may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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// This software is provided by the copyright holders and contributors as is and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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__kernel void preCornerDetect(__global const uchar * Dxptr, int dx_step, int dx_offset,
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__global const uchar * Dyptr, int dy_step, int dy_offset,
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__global const uchar * D2xptr, int d2x_step, int d2x_offset,
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__global const uchar * D2yptr, int d2y_step, int d2y_offset,
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__global const uchar * Dxyptr, int dxy_step, int dxy_offset,
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__global uchar * dstptr, int dst_step, int dst_offset,
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int dst_rows, int dst_cols, float factor)
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int x = get_global_id(0);
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int y = get_global_id(1);
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if (x < dst_cols && y < dst_rows)
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int dx_index = mad24(dx_step, y, (int)sizeof(float) * x + dx_offset);
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int dy_index = mad24(dy_step, y, (int)sizeof(float) * x + dy_offset);
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int d2x_index = mad24(d2x_step, y, (int)sizeof(float) * x + d2x_offset);
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int d2y_index = mad24(d2y_step, y, (int)sizeof(float) * x + d2y_offset);
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int dxy_index = mad24(dxy_step, y, (int)sizeof(float) * x + dxy_offset);
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int dst_index = mad24(dst_step, y, (int)sizeof(float) * x + dst_offset);
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float dx = *(__global const float *)(Dxptr + dx_index);
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float dy = *(__global const float *)(Dyptr + dy_index);
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float d2x = *(__global const float *)(D2xptr + d2x_index);
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float d2y = *(__global const float *)(D2yptr + d2y_index);
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float dxy = *(__global const float *)(Dxyptr + dxy_index);
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__global float * dst = (__global float *)(dstptr + dst_index);
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dst[0] = factor * (dx*dx*d2y + dy*dy*d2x - 2*dx*dy*dxy);