f4334277
 Hu Chunming
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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009-2012, Willow Garage Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of the copyright holders may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#include "precomp.hpp"
/*
Gabor filters and such. To be greatly extended to have full texture analysis.
For the formulas and the explanation of the parameters see:
http://en.wikipedia.org/wiki/Gabor_filter
*/
cv::Mat cv::getGaborKernel( Size ksize, double sigma, double theta,
double lambd, double gamma, double psi, int ktype )
{
double sigma_x = sigma;
double sigma_y = sigma/gamma;
int nstds = 3;
int xmin, xmax, ymin, ymax;
double c = cos(theta), s = sin(theta);
if( ksize.width > 0 )
xmax = ksize.width/2;
else
xmax = cvRound(std::max(fabs(nstds*sigma_x*c), fabs(nstds*sigma_y*s)));
if( ksize.height > 0 )
ymax = ksize.height/2;
else
ymax = cvRound(std::max(fabs(nstds*sigma_x*s), fabs(nstds*sigma_y*c)));
xmin = -xmax;
ymin = -ymax;
CV_Assert( ktype == CV_32F || ktype == CV_64F );
Mat kernel(ymax - ymin + 1, xmax - xmin + 1, ktype);
double scale = 1;
double ex = -0.5/(sigma_x*sigma_x);
double ey = -0.5/(sigma_y*sigma_y);
double cscale = CV_PI*2/lambd;
for( int y = ymin; y <= ymax; y++ )
for( int x = xmin; x <= xmax; x++ )
{
double xr = x*c + y*s;
double yr = -x*s + y*c;
double v = scale*std::exp(ex*xr*xr + ey*yr*yr)*cos(cscale*xr + psi);
if( ktype == CV_32F )
kernel.at<float>(ymax - y, xmax - x) = (float)v;
else
kernel.at<double>(ymax - y, xmax - x) = v;
}
return kernel;
}
/* End of file. */
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