yuv转opencv中的IplImage

来源：互联网发布：数据帧格式设计编辑：程序博客网时间：2024/05/21 09:29

一个小的程序，在网上找了很久没有发现

自己搞了一个大家看看

第一个是很笨的办法：

yuv三个分量分别写在3个矩阵下，然后合并之后转换为rgb分量的图片格式就可以了；

代码如下：

IplImage *image,*rgbimg,*yimg,*uimg,*vimg,*uuimg,*vvimg;rgbimg = cvCreateImage(cvSize(nWidth, nHeight),IPL_DEPTH_8U,3);image = cvCreateImage(cvSize(nWidth, nHeight),IPL_DEPTH_8U,3);    yimg = cvCreateImageHeader(cvSize(nWidth, nHeight),IPL_DEPTH_8U,1);uimg = cvCreateImageHeader(cvSize(nWidth/2, nHeight/2),IPL_DEPTH_8U,1);vimg = cvCreateImageHeader(cvSize(nWidth/2, nHeight/2),IPL_DEPTH_8U,1);    uuimg = cvCreateImage(cvSize(nWidth, nHeight),IPL_DEPTH_8U,1);vvimg = cvCreateImage(cvSize(nWidth, nHeight),IPL_DEPTH_8U,1);    cvSetData(yimg,pBuf, nWidth);cvSetData(uimg,pBuf+nWidth*nHeight, nWidth/2);cvSetData(vimg,pBuf+long(nWidth*nHeight*1.25), nWidth/2);cvResize(uimg,uuimg,CV_INTER_LINEAR);cvResize(vimg,vvimg,CV_INTER_LINEAR);    cvMerge(yimg,uuimg,vvimg,NULL,image);cvCvtColor(image,rgbimg,CV_YCrCb2BGR);

还有一个方法就比较负载

首先自己根据原理转换为rgb格式

然后利用cvSetData（）函数写入数据生成IplImage格式的图片

首先定义转换的公式：

#define MR(Y,U,V) (Y + (1.403)*(V-128))#define MG(Y,U,V) (Y - (0.344) * (U-128) - (0.714) * (V-128) ) #define MB(Y,U,V) (Y + ((1.773) * (U-128)))

yuv转rgb的函数：

void YUV420_C_RGB( char* pYUV, unsigned char* pRGB, int height, int width){    char* pY = pYUV;    char* pU = pYUV+height*width;    char* pV = pU+(height*width/4);    unsigned char* pBGR = NULL;    unsigned char R = 0;    unsigned char G = 0;    unsigned char B = 0;    char Y = 0;    char U = 0;    char V = 0;    double tmp = 0;    for ( int i = 0; i < height; ++i )    {        for ( int j = 0; j < width; ++j )        {            pBGR = pRGB+ i*width*3+j*3;            Y = *(pY+i*width+j);            U = *pU;            V = *pV;            //B            tmp = MB(Y, U, V);            //B = (tmp > 255) ? 255 : (char)tmp;            //B = (B<0) ? 0 : B;B = (unsigned char)tmp;            //G            tmp = MG(Y, U, V);            //G = (tmp > 255) ? 255 : (char)tmp;           // G = (G<0) ? 0 : G;G = (unsigned char)tmp;            //R            tmp = MR(Y, U, V);            //R = (tmp > 255) ? 255 : (char)tmp;            //R = (R<0) ? 0 : R;R = (unsigned char)tmp;            *pBGR     = R;                        *(pBGR+1) = G;                    *(pBGR+2) = B;                    if ( i%2 == 0 && j%2 == 0)            {                *pU++;//*pV++;            }            else            {                if ( j%2 == 0 )                {                    *pV++ ;                }}        }        }}

最后是写入IplImage的代码：

unsigned char* pRGB = NULL;pRGB = (unsigned char*)malloc(nSize*sizeof(unsigned char*)*2);YUV420_C_RGB(pBuf,pRGB,nWidth,nHeight);IplImage *image;image = cvCreateImageHeader(cvSize(nWidth, nHeight),IPL_DEPTH_8U,3);cvSetData(image,pRGB,nWidth*3);

程序都运行过

编译环境为vs2008

opencv2.0版本