void yuv420Torgb()

{

FILE *fp = fopen("D:\\1.yuv","rb");

int width = ;

int height = ;

uchar *yuvdata = new uchar[height *  /  * width * sizeof(uchar)];

fread(yuvdata, height *  / , width, fp);

Mat yuvimg(height *  / , width, CV_8UC1, yuvdata);

Mat rgbimg(height, width, CV_8UC3);

cvtColor(yuvimg, rgbimg, COLOR_YUV2BGR_NV21);

namedWindow("src", );

imshow("src", rgbimg);

waitKey();

fclose(fp);

delete[] yuvdata;

}