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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, 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"
namespace cv
{
template<typename QT> inline QT sqr(uchar a) { return a*a; }
template<typename QT> inline QT sqr(float a) { return a*a; }
template<typename QT> inline QT sqr(double a) { return a*a; }
template<> inline double sqr(uchar a) { return CV_8TO32F_SQR(a); }
template<typename T, typename ST, typename QT>
void integral_( const Mat& _src, Mat& _sum, Mat& _sqsum, Mat& _tilted )
{
int cn = _src.channels();
Size size = _src.size();
int x, y, k;
const T* src = (const T*)_src.data;
ST* sum = (ST*)_sum.data;
ST* tilted = (ST*)_tilted.data;
QT* sqsum = (QT*)_sqsum.data;
int srcstep = (int)(_src.step/sizeof(T));
int sumstep = (int)(_sum.step/sizeof(ST));
int tiltedstep = (int)(_tilted.step/sizeof(ST));
int sqsumstep = (int)(_sqsum.step/sizeof(QT));
size.width *= cn;
memset( sum, 0, (size.width+cn)*sizeof(sum[0]));
sum += sumstep + cn;
if( sqsum )
{
memset( sqsum, 0, (size.width+cn)*sizeof(sqsum[0]));
sqsum += sqsumstep + cn;
}
if( tilted )
{
memset( tilted, 0, (size.width+cn)*sizeof(tilted[0]));
tilted += tiltedstep + cn;
}
if( sqsum == 0 && tilted == 0 )
{
for( y = 0; y < size.height; y++, src += srcstep - cn, sum += sumstep - cn )
{
for( k = 0; k < cn; k++, src++, sum++ )
{
ST s = sum[-cn] = 0;
for( x = 0; x < size.width; x += cn )
{
s += src[x];
sum[x] = sum[x - sumstep] + s;
}
}
}
}
else if( tilted == 0 )
{
for( y = 0; y < size.height; y++, src += srcstep - cn,
sum += sumstep - cn, sqsum += sqsumstep - cn )
{
for( k = 0; k < cn; k++, src++, sum++, sqsum++ )
{
ST s = sum[-cn] = 0;
QT sq = sqsum[-cn] = 0;
for( x = 0; x < size.width; x += cn )
{
T it = src[x];
s += it;
sq += sqr<QT>(it);
ST t = sum[x - sumstep] + s;
QT tq = sqsum[x - sqsumstep] + sq;
sum[x] = t;
sqsum[x] = tq;
}
}
}
}
else
{
AutoBuffer<ST> _buf(size.width+cn);
ST* buf = _buf;
ST s;
QT sq;
for( k = 0; k < cn; k++, src++, sum++, tilted++, sqsum++, buf++ )
{
sum[-cn] = tilted[-cn] = 0;
sqsum[-cn] = 0;
for( x = 0, s = 0, sq = 0; x < size.width; x += cn )
{
T it = src[x];
buf[x] = tilted[x] = it;
s += it;
sq += sqr<QT>(it);
sum[x] = s;
sqsum[x] = sq;
}
if( size.width == cn )
buf[cn] = 0;
}
for( y = 1; y < size.height; y++ )
{
src += srcstep - cn;
sum += sumstep - cn;
sqsum += sqsumstep - cn;
tilted += tiltedstep - cn;
buf += -cn;
for( k = 0; k < cn; k++, src++, sum++, sqsum++, tilted++, buf++ )
{
T it = src[0];
ST t0 = s = it;
QT tq0 = sq = sqr<QT>(it);
sum[-cn] = 0;
sqsum[-cn] = 0;
tilted[-cn] = tilted[-tiltedstep];
sum[0] = sum[-sumstep] + t0;
sqsum[0] = sqsum[-sqsumstep] + tq0;
tilted[0] = tilted[-tiltedstep] + t0 + buf[cn];
for( x = cn; x < size.width - cn; x += cn )
{
ST t1 = buf[x];
buf[x - cn] = t1 + t0;
t0 = it = src[x];
tq0 = sqr<QT>(it);
s += t0;
sq += tq0;
sum[x] = sum[x - sumstep] + s;
sqsum[x] = sqsum[x - sqsumstep] + sq;
t1 += buf[x + cn] + t0 + tilted[x - tiltedstep - cn];
tilted[x] = t1;
}
if( size.width > cn )
{
ST t1 = buf[x];
buf[x - cn] = t1 + t0;
t0 = it = src[x];
tq0 = sqr<QT>(it);
s += t0;
sq += tq0;
sum[x] = sum[x - sumstep] + s;
sqsum[x] = sqsum[x - sqsumstep] + sq;
tilted[x] = t0 + t1 + tilted[x - tiltedstep - cn];
buf[x] = t0;
}
}
}
}
}
typedef void (*IntegralFunc)(const Mat& _src, Mat& _sum, Mat& _sqsum, Mat& _tilted );
static void
integral( const Mat& src, Mat& sum, Mat* _sqsum, Mat* _tilted, int sdepth )
{
int depth = src.depth(), cn = src.channels();
Size isize(src.cols + 1, src.rows+1);
Mat sqsum, tilted;
if( sdepth <= 0 )
sdepth = depth == CV_8U ? CV_32S : CV_64F;
sdepth = CV_MAT_DEPTH(sdepth);
sum.create( isize, CV_MAKETYPE(sdepth, cn) );
if( _tilted )
_tilted->create( isize, CV_MAKETYPE(sdepth, cn) );
else
_tilted = &tilted;
if( !_sqsum )
_sqsum = &sqsum;
if( _sqsum != &sqsum || _tilted->data )
_sqsum->create( isize, CV_MAKETYPE(CV_64F, cn) );
IntegralFunc func = 0;
if( depth == CV_8U && sdepth == CV_32S )
func = integral_<uchar, int, double>;
else if( depth == CV_8U && sdepth == CV_32F )
func = integral_<uchar, float, double>;
else if( depth == CV_8U && sdepth == CV_64F )
func = integral_<uchar, double, double>;
else if( depth == CV_32F && sdepth == CV_64F )
func = integral_<float, double, double>;
else if( depth == CV_64F && sdepth == CV_64F )
func = integral_<double, double, double>;
else
CV_Error( CV_StsUnsupportedFormat, "" );
func( src, sum, *_sqsum, *_tilted );
}
void integral( const Mat& src, Mat& sum, int sdepth )
{
integral( src, sum, 0, 0, sdepth );
}
void integral( const Mat& src, Mat& sum, Mat& sqsum, int sdepth )
{
integral( src, sum, &sqsum, 0, sdepth );
}
void integral( const Mat& src, Mat& sum, Mat& sqsum, Mat& tilted, int sdepth )
{
integral( src, sum, &sqsum, &tilted, sdepth );
}
}
CV_IMPL void
cvIntegral( const CvArr* image, CvArr* sumImage,
CvArr* sumSqImage, CvArr* tiltedSumImage )
{
cv::Mat src = cv::cvarrToMat(image), sum = cv::cvarrToMat(sumImage), sum0 = sum;
cv::Mat sqsum0, sqsum, tilted0, tilted;
cv::Mat *psqsum = 0, *ptilted = 0;
if( sumSqImage )
{
sqsum0 = sqsum = cv::cvarrToMat(sumSqImage);
psqsum = &sqsum;
}
if( tiltedSumImage )
{
tilted0 = tilted = cv::cvarrToMat(tiltedSumImage);
ptilted = &tilted;
}
cv::integral( src, sum, psqsum, ptilted, sum.depth() );
CV_Assert( sum.data == sum0.data && sqsum.data == sqsum0.data && tilted.data == tilted0.data );
}
/* End of file. */