opencv 读取 yuv(4:2:0)

来源：互联网发布：软件定制开发服务编辑：程序博客网时间：2024/05/22 13:31

转自：http://blog.csdn.net/david412306524/article/details/7672517

#include <opencv/highgui.h>
#include <stdio.h>

//#include <>

#define nWidth 352
#define nHeight 288
#define FrameSize nWidth*nHeight*3/2
int _tmain(int argc, _TCHAR* argv[])
{
/*IplImage *img = cvLoadImage("D:\\workspace\\cv_yun\\DSC_1598.JPG");
cvNamedWindow("a");
cvShowImage("a",img);
cvWaitKey(0);
*/

FILE *f ;
if(!(f = fopen("目录\\foreman_cif.yuv","rb")))
{
printf("file open error!");
}

// calculate the frame num
fseek(f, 0, SEEK_END);
int frame_count = 0;
long file_size = 0;
frame_count = (int) ((int)ftell(f)/((nWidth * nHeight * 3) / 2)); // ftell 用于求文件大小
printf("frame num is %d \n", frame_count);
printf("file length is %d",ftell(f));

fseek(f, 0, SEEK_SET);//文件内位置定位到文件头
//IplImage *img = cvCreateImage(cvSize(352,288),IPL_DEPTH_8U,1);
//IplImage *grey;
IplImage *yimg = cvCreateImage(cvSize(nWidth, nHeight),IPL_DEPTH_8U,1);
//IplImage *uimg = cvCreateImageHeader(cvSize(nWidth/2, nHeight/2),IPL_DEPTH_8U,1);
//IplImage *vimg = cvCreateImageHeader(cvSize(nWidth/2, nHeight/2),IPL_DEPTH_8U,1);

//----------------------------------------------------------------------实现读取一个文件显示照片
unsigned char *pBuf = new unsigned char[nWidth*nHeight*3/2];
fread(pBuf, 1, (nWidth * nHeight * 3) / 2, f);// nWidth*nHeight*3/2 means 本程序使用 yuv:4:2:0 yuv分为 Y Cb Cr 三部分
cvSetData(yimg, pBuf, nWidth);

cvNamedWindow("a");
cvShowImage("a", yimg);
cvWaitKey( 0 );

//----------------------------------------------------------------------读取yuv文件的y部分类似于播放器效果
/*unsigned char *pBuf = new unsigned char[nWidth*nHeight*3/2];
int pos = 0;
for(int i = 0; i<frame_count-1; i++ )
{
  fseek(f, pos, SEEK_SET);
  fread(pBuf,1 , FrameSize, f );
  cvSetData(yimg, pBuf, nWidth);
  cvNamedWindow("a");
  cvShowImage("a", yimg);
  cvWaitKey( 33 );
  pos += FrameSize;
}
*/

cvDestroyWindow("a");
cvReleaseImage(&yimg);
delete []pBuf;

fclose(f);
return 0;
}