YUV转IPLImage（RGB）

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);

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复杂

 

 

 

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：

 

#defineMR(Y,U,V)(Y+(1.403)*(V-128))
#defineMG(Y,U,V)(Y-(0.344)*(U-128)-(0.714)*(V-128))
#defineMB(Y,U,V)(Y+((1.773)*(U-128)))

#defineMR(Y,U,V)(Y+(1.403)*(V-128))
#defineMG(Y,U,V)(Y-(0.344)*(U-128)-(0.714)*(V-128))
#defineMB(Y,U,V)(Y+((1.773)*(U-128)))

yuv转rgb的函数：

 

 

 

 

voidYUV420_C_RGB(char*pYUV,unsignedchar*pRGB,intheight,intwidth)
{
char*pY=pYUV;
char*pU=pYUV+height*width;
char*pV=pU+(height*width/4);


unsignedchar*pBGR=NULL;
unsignedcharR=0;
unsignedcharG=0;
unsignedcharB=0;
charY=0;
charU=0;
charV=0;
doubletmp=0;
for(inti=0;i<height;++i)
{
for(intj=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=(unsignedchar)tmp;
//G
tmp=MG(Y,U,V);
//G=(tmp>255)?255:(char)tmp;
//G=(G<0)?0:G;
G=(unsignedchar)tmp;
//R
tmp=MR(Y,U,V);
//R=(tmp>255)?255:(char)tmp;
//R=(R<0)?0:R;
R=(unsignedchar)tmp;


*pBGR=R;
*(pBGR+1)=G;
*(pBGR+2)=B;


if(i%2==0&&j%2==0)
{
*pU++;
//*pV++;
}
else
{
if(j%2==0)
{
*pV++;
}
}
}

}
}

voidYUV420_C_RGB(char*pYUV,unsignedchar*pRGB,intheight,intwidth)
{
char*pY=pYUV;
char*pU=pYUV+height*width;
char*pV=pU+(height*width/4);


unsignedchar*pBGR=NULL;
unsignedcharR=0;
unsignedcharG=0;
unsignedcharB=0;
charY=0;
charU=0;
charV=0;
doubletmp=0;
for(inti=0;i<height;++i)
{
for(intj=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=(unsignedchar)tmp;
//G
tmp=MG(Y,U,V);
//G=(tmp>255)?255:(char)tmp;
//G=(G<0)?0:G;
G=(unsignedchar)tmp;
//R
tmp=MR(Y,U,V);
//R=(tmp>255)?255:(char)tmp;
//R=(R<0)?0:R;
R=(unsignedchar)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：

 

 

 

 

unsignedchar*pRGB=NULL;

pRGB=(unsignedchar*)malloc(nSize*sizeof(unsignedchar*)*2);

YUV420_C_RGB(pBuf,pRGB,nWidth,nHeight);

IplImage*image;
image=cvCreateImageHeader(cvSize(nWidth,nHeight),IPL_DEPTH_8U,3);
cvSetData(image,pRGB,nWidth*3);

unsignedchar*pRGB=NULL;

pRGB=(unsignedchar*)malloc(nSize*sizeof(unsignedchar*)*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

 

原帖地址：http://blog.csdn.net/dreamd1987/article/details/7259479