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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.
//
//
// Intel License Agreement
//
// Copyright (C) 2000, Intel Corporation, 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 Intel Corporation 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"
void cvReleaseBGStatModel( CvBGStatModel** bg_model )
{
if( bg_model && *bg_model && (*bg_model)->release )
(*bg_model)->release( bg_model );
}
int cvUpdateBGStatModel( IplImage* current_frame,
CvBGStatModel* bg_model,
double learningRate )
{
return bg_model && bg_model->update ? bg_model->update( current_frame, bg_model, learningRate ) : 0;
}
// Function cvRefineForegroundMaskBySegm preforms FG post-processing based on segmentation
// (all pixels of the segment will be classified as FG if majority of pixels of the region are FG).
// parameters:
// segments - pointer to result of segmentation (for example MeanShiftSegmentation)
// bg_model - pointer to CvBGStatModel structure
CV_IMPL void cvRefineForegroundMaskBySegm( CvSeq* segments, CvBGStatModel* bg_model )
{
IplImage* tmp_image = cvCreateImage(cvSize(bg_model->foreground->width,bg_model->foreground->height),
IPL_DEPTH_8U, 1);
for( ; segments; segments = ((CvSeq*)segments)->h_next )
{
CvSeq seq = *segments;
seq.v_next = seq.h_next = NULL;
cvZero(tmp_image);
cvDrawContours( tmp_image, &seq, CV_RGB(0, 0, 255), CV_RGB(0, 0, 255), 10, -1);
int num1 = cvCountNonZero(tmp_image);
cvAnd(tmp_image, bg_model->foreground, tmp_image);
int num2 = cvCountNonZero(tmp_image);
if( num2 > num1*0.5 )
cvDrawContours( bg_model->foreground, &seq, CV_RGB(0, 0, 255), CV_RGB(0, 0, 255), 10, -1);
else
cvDrawContours( bg_model->foreground, &seq, CV_RGB(0, 0, 0), CV_RGB(0, 0, 0), 10, -1);
}
cvReleaseImage(&tmp_image);
}
CV_IMPL CvSeq*
cvSegmentFGMask( CvArr* _mask, int poly1Hull0, float perimScale,
CvMemStorage* storage, CvPoint offset )
{
CvMat mstub, *mask = cvGetMat( _mask, &mstub );
CvMemStorage* tempStorage = storage ? storage : cvCreateMemStorage();
CvSeq *contours, *c;
int nContours = 0;
CvContourScanner scanner;
// clean up raw mask
cvMorphologyEx( mask, mask, 0, 0, CV_MOP_OPEN, 1 );
cvMorphologyEx( mask, mask, 0, 0, CV_MOP_CLOSE, 1 );
// find contours around only bigger regions
scanner = cvStartFindContours( mask, tempStorage,
sizeof(CvContour), CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, offset );
while( (c = cvFindNextContour( scanner )) != 0 )
{
double len = cvContourPerimeter( c );
double q = (mask->rows + mask->cols)/perimScale; // calculate perimeter len threshold
if( len < q ) //Get rid of blob if it's perimeter is too small
cvSubstituteContour( scanner, 0 );
else //Smooth it's edges if it's large enough
{
CvSeq* newC;
if( poly1Hull0 ) //Polygonal approximation of the segmentation
newC = cvApproxPoly( c, sizeof(CvContour), tempStorage, CV_POLY_APPROX_DP, 2, 0 );
else //Convex Hull of the segmentation
newC = cvConvexHull2( c, tempStorage, CV_CLOCKWISE, 1 );
cvSubstituteContour( scanner, newC );
nContours++;
}
}
contours = cvEndFindContours( &scanner );
// paint the found regions back into the image
cvZero( mask );
for( c=contours; c != 0; c = c->h_next )
cvDrawContours( mask, c, cvScalarAll(255), cvScalarAll(0), -1, CV_FILLED, 8,
cvPoint(-offset.x,-offset.y));
if( tempStorage != storage )
{
cvReleaseMemStorage( &tempStorage );
contours = 0;
}
return contours;
}
/* End of file. */