2012-02-06 09:09:54 +08:00
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/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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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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//
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//
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// License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009-2012, Willow Garage Inc., all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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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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//
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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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//
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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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//
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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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//
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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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//
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//M*/
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#include "precomp.hpp"
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/*
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Gabor filters and such. To be greatly extended to have full texture analysis.
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For the formulas and the explanation of the parameters see:
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http://en.wikipedia.org/wiki/Gabor_filter
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*/
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cv::Mat cv::getGaborKernel( Size ksize, double sigma, double theta,
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double lambd, double gamma, double psi, int ktype )
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{
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double sigma_x = sigma;
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double sigma_y = sigma/gamma;
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int nstds = 3;
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int xmin, xmax, ymin, ymax;
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double c = cos(theta), s = sin(theta);
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if( ksize.width > 0 )
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xmax = ksize.width/2;
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else
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2012-02-14 18:22:34 +08:00
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xmax = (int)std::max(fabs(nstds*sigma_x*c), fabs(nstds*sigma_y*s));
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2012-02-06 09:09:54 +08:00
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if( ksize.height > 0 )
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ymax = ksize.height/2;
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else
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2012-02-14 18:22:34 +08:00
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ymax = (int)std::max(fabs(nstds*sigma_x*s), fabs(nstds*sigma_y*c));
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2012-02-06 09:09:54 +08:00
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xmin = -xmax;
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ymin = -ymax;
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CV_Assert( ktype == CV_32F || ktype == CV_64F );
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Mat kernel(ymax - ymin + 1, xmax - xmin + 1, ktype);
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double scale = 1/(2*CV_PI*sigma_x*sigma_y);
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double ex = -0.5/(sigma_x*sigma_x);
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double ey = -0.5/(sigma_y*sigma_y);
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double cscale = CV_PI*2/lambd;
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for( int y = ymin; y <= ymax; y++ )
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for( int x = xmin; x <= xmax; x++ )
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{
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double xr = x*c + y*s;
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double yr = -x*s + y*c;
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double v = scale*exp(ex*xr*xr + ey*yr*yr)*cos(cscale*xr + psi);
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if( ktype == CV_32F )
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kernel.at<float>(ymax - y, xmax - x) = (float)v;
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else
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kernel.at<double>(ymax - y, xmax - x) = v;
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}
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return kernel;
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}
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/* End of file. */
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