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// Copyright (c) 2012 libmv authors.
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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#ifndef LIBMV_IMAGE_CORRELATION_H
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#define LIBMV_IMAGE_CORRELATION_H
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#include "libmv/image/image.h"
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inline double PearsonProductMomentCorrelation(Array3Df image_and_gradient1_sampled,
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Array3Df image_and_gradient2_sampled,
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double sX=0,sY=0,sXX=0,sYY=0,sXY=0;
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for (int r = 0; r < width; ++r) {
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for (int c = 0; c < width; ++c) {
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double x = image_and_gradient1_sampled(r, c, 0);
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double y = image_and_gradient2_sampled(r, c, 0);
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double N = width*width;
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sX /= N, sY /= N, sXX /= N, sYY /= N, sXY /= N;
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double correlation = (sXY-sX*sY)/sqrt(double((sXX-sX*sX)*(sYY-sY*sY)));
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#endif // LIBMV_IMAGE_IMAGE_CORRELATION_H