include "stdio.h"

include "openc\cv.h"

include "opencv\cxcore.h"

include "opencv\highgui.h"

define WIDTH 320

define HEIGHT 240

int main( int argc, char **argv ){

int key;
CvCapture *capture = NULL;
IplImage *frameImage;

IplImage *backgroundImage = cvCreateImage( cvSize(WIDTH, HEIGHT), IPL_DEPTH_8U, 1); IplImage *grayImage = cvCreateImage( cvSize(WIDTH, HEIGHT), IPL_DEPTH_8U, 1);
IplImage *differenceImage = cvCreateImage( cvSize(WIDTH, HEIGHT), IPL_DEPTH_8U, 1);

char windowNameCapture[]="Capture";
char windowNameDifference[]="Difference";

if(( capture = cvCreateCameraCapture(-1)) == NULL) {

printf( "カメラが見つかりません\n");

    return -1;
}

cvNamedWindow( windowNameCapture, CV_WINDOW_AUTOSIZE );
cvNamedWindow( windowNameDifference, CV_WINDOW_AUTOSIZE );

frameImage = cvQueryFrame( capture );

cvCvtColor( frameImage, backgroundImage, CV_BGR2GRAY );

while( 1 ){

        frameImage = cvQueryFrame( capture );

    cvCvtColor( frameImage, grayImage, CV_BGR2GRAY );

    cvAbsDiff( grayImage, backgroundImage, differenceImage );

if( (*differenceImage).origin == 0 ) {

   cvFlip( differenceImage, differenceImage, 0 );

}

cvShowImage( windowNameCapture, frameImage );

cvShowImage( windowNameDifference, differenceImage );

  key = cvWaitKey( 1 );
  if( key == 'q' ) {
   break;

} else if( key == 'b' ) {

   frameImage = cvQueryFrame( capture );

   cvCvtColor( frameImage, backgroundImage, CV_BGR2GRAY );

}

}

   cvReleaseCapture( &capture );

   cvReleaseImage( &backgroundImage );

   cvReleaseImage( &grayImage );

   cvReleaseImage( &differenceImage );


cvDestroyWindow( windowNameCapture );
cvDestroyWindow( windowNameDifference );
return 0;
}