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opencv.cpp
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opencv.cpp
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#include "cv.h"
#include "highgui.h"
#include <time.h>
#include <math.h>
#include <ctype.h>
#include <stdio.h>
const double MHI_DURATION = 1;
const double MAX_TIME_DELTA = 0.5;
const double MIN_TIME_DELTA = 0.05;
const int N = 4;
IplImage **buf = 0;
int last = 0;
IplImage *mhi = 0;
IplImage *orient = 0;
IplImage *mask = 0;
IplImage *segmask = 0;
CvMemStorage* storage = 0;
void update_mhi( IplImage* img, IplImage* dst, int diff_threshold )
{
double timestamp = (double)clock()/CLOCKS_PER_SEC;
CvSize size = cvSize(img->width,img->height);
int i, idx1 = last, idx2;
IplImage* silh;
CvSeq* seq;
CvRect comp_rect;
double count;
double angle;
CvPoint center;
double magnitude;
CvScalar color;
if( !mhi || mhi->width != size.width || mhi->height != size.height ) {
if( buf == 0 ) {
buf = (IplImage**)malloc(N*sizeof(buf[0]));
memset( buf, 0, N*sizeof(buf[0]));
}
for( i = 0; i < N; i++ ) {
cvReleaseImage( &buf[i] );
buf[i] = cvCreateImage( size, IPL_DEPTH_8U, 1 );
cvZero( buf[i] );
}
cvReleaseImage( &mhi );
cvReleaseImage( &orient );
cvReleaseImage( &segmask );
cvReleaseImage( &mask );
mhi = cvCreateImage( size, IPL_DEPTH_32F, 1 );
cvZero( mhi );
orient = cvCreateImage( size, IPL_DEPTH_32F, 1 );
segmask = cvCreateImage( size, IPL_DEPTH_32F, 1 );
mask = cvCreateImage( size, IPL_DEPTH_8U, 1 );
}
cvCvtColor( img, buf[last], CV_BGR2GRAY );
idx2 = (last + 1) % N;
last = idx2;
silh = buf[idx2];
cvAbsDiff( buf[idx1], buf[idx2], silh );
cvThreshold( silh, silh, diff_threshold, 1, CV_THRESH_BINARY );
cvUpdateMotionHistory( silh, mhi, timestamp, MHI_DURATION );
cvCvtScale( mhi, mask, 255./MHI_DURATION,
(MHI_DURATION - timestamp)*255./MHI_DURATION );
cvZero( dst );
cvCvtPlaneToPix( mask, 0, 0, 0, dst );
cvCalcMotionGradient( mhi, mask, orient, MAX_TIME_DELTA, MIN_TIME_DELTA, 3 );
if( !storage )
storage = cvCreateMemStorage(0);
else
cvClearMemStorage(storage);
seq = cvSegmentMotion( mhi, segmask, storage, timestamp, MAX_TIME_DELTA );
for( i = -1; i < seq->total; i++ ) {
if( i < 0 ) {
comp_rect = cvRect( 0, 0, size.width, size.height );
color = CV_RGB(255,255,255);
magnitude = 100;
}
else {
comp_rect = ((CvConnectedComp*)cvGetSeqElem( seq, i ))->rect;
if( comp_rect.width + comp_rect.height < 100 )
continue;
color = CV_RGB(255,0,0);
magnitude = 30;
}
cvSetImageROI( silh, comp_rect );
cvSetImageROI( mhi, comp_rect );
cvSetImageROI( orient, comp_rect );
cvSetImageROI( mask, comp_rect );
angle = cvCalcGlobalOrientation( orient, mask, mhi, timestamp, MHI_DURATION);
angle = 360.0 - angle;
count = cvNorm( silh, 0, CV_L1, 0 );
cvResetImageROI( mhi );
cvResetImageROI( orient );
cvResetImageROI( mask );
cvResetImageROI( silh );
if( count < comp_rect.width*comp_rect.height * 0.05 )
continue;
center = cvPoint( (comp_rect.x + comp_rect.width/2),
(comp_rect.y + comp_rect.height/2) );
cvCircle( dst, center, cvRound(magnitude*1.2), color, 3, CV_AA, 0 );
cvLine( dst, center, cvPoint( cvRound( center.x + magnitude*cos(angle*CV_PI/180)),
cvRound( center.y - magnitude*sin(angle*CV_PI/180))), color, 3, CV_AA, 0 );
}
}
int main(int argc, char** argv)
{
IplImage* motion = 0;
CvCapture* capture = 0;
if( argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
capture = cvCaptureFromCAM( argc == 2 ? argv[1][0] - '0': 0 );
else if( argc == 2 )
capture = cvCaptureFromFile( argv[1] );
if( capture )
{
cvNamedWindow( "Motion", 1 );
for(;;)
{
IplImage* image;
if( !cvGrabFrame( capture ))
break;
image = cvRetrieveFrame( capture );
if( image )
{
if( !motion )
{
motion = cvCreateImage( cvSize(image->width,image->height), 8, 3 );
cvZero( motion );
motion->origin = image->origin;
}
}
update_mhi( image, motion, 30 );
cvShowImage( "Motion", motion );
if( cvWaitKey(10) >= 0 )
break;
}
cvReleaseCapture( &capture );
cvDestroyWindow( "Motion" );
}
return 0;
}