#include <stdio.h>
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
int main( )
{
CvCapture* capture = NULL;
IplImage *frame = NULL;
IplImage *frame_last = NULL;//存储上一帧
IplImage *m_out_image = NULL;
IplImage* frame_gray = NULL;
IplImage* frame_gray_last = NULL;
IplImage* m_out_image_copy = NULL;
int nFrmNum = 0;
capture = cvCaptureFromAVI("d:\\opencv\\room.avi");
//创建窗口
cvNamedWindow("源视频");
cvNamedWindow("背景差分");
//逐帧读取视频
while(frame = cvQueryFrame( capture ))
{
nFrmNum++;
//如果是第一帧，需要申请内存，并初始化
if(nFrmNum == 1)
{
frame_last = cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_8U, frame->nChannels);
cvCopy(frame,frame_last);
}
else
{
frame_gray = cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_8U, 1);
frame_gray_last = cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_8U, 1);
m_out_image = cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_8U, 1);
m_out_image_copy = cvCreateImage( cvSize(frame->width,frame->height),IPL_DEPTH_8U, 1 );
cvCvtColor(frame,frame_gray,CV_RGB2GRAY);
cvCvtColor(frame_last,frame_gray_last,CV_RGB2GRAY);
cvAbsDiff(frame_gray,frame_gray_last,m_out_image);
//cvThreshold(m_out_image,m_out_image,128, 255,CV_THRESH_BINARY);
//将处理后的图像写到第二个图像中
if( m_out_image_copy->origin == IPL_ORIGIN_TL )
{
cvCopy( m_out_image, m_out_image_copy, 0 );
}
else
{
cvFlip( m_out_image, m_out_image_copy, 0 );
}
frame_last = cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_8U, frame->nChannels);
cvCopy(frame,frame_last);
cvShowImage("背景差分",m_out_image_copy);
cvShowImage("源视频",frame);
cvReleaseImage( &m_out_image_copy );
cvReleaseImage( &frame_gray_last );
cvReleaseImage( &frame_gray );
if( cvWaitKey(30) >= 0 )
{
break;
}
}
}
cvWaitKey();
cvReleaseImage( &m_out_image );
cvReleaseImage( &frame_last );
cvReleaseImage( &frame );
cvReleaseCapture( &capture );
cvDestroyWindow("源视频");
cvDestroyWindow("背景差分");
return 0;
}
