artoolkit video 数据转换到 IplImage*

//************************************
// Method:    Fill_CV_IplImage
// FullName:  Fill_CV_IplImage
// Access:    public 
// Returns:   bool
// Qualifier:
// Parameter: int width
// Parameter: int height
// Parameter: char * imageData
// Parameter: IplImage * pOutImg
// Description:
// pOutImg must be a IplImage* whose header has been created as 4 channels
// and IPL_DEPTH_8U depth
//************************************
void Fill_CV_IplImage(int width, int height, char* imageData, IplImage* pOutImg)
{
 // artoolkit video data to IplImage*
 // the key lies in the fact that arVideoGetImage returns buffer with order
 // RGBA, which is the 4-channel and IPL_DEPTH_8U-depth OpenCV buffer  
 IplImage *img = cvCreateImageHeader(cvSize(width, height), IPL_DEPTH_8U, 4);
 cvSetImageData(img, imageData, width * 4);
 cvCopy(img, pOutImg);
 cvReleaseImageHeader(&img);
}

 如果需要再额外地将4通道图像转换到3通道的话，那么就需要使用以下的函数。

//************************************
// Method:    Fill_CV_IplImage
// FullName:  Fill_CV_IplImage
// Access:    public 
// Returns:   bool
// Qualifier:
// Parameter: int width
// Parameter: int height
// Parameter: char * imageData
// Parameter: IplImage * pOutImg

// Description:
// pOutImg must be a IplImage* whose header has been created as 3 channels
// and IPL_DEPTH_8U depth
//************************************
void Fill_CV_IplImage(int width, int height, char* imageData, IplImage* pOutImg)
{
    // artoolkit video data to IplImage*
    // the key lies in the fact that arVideoGetImage returns buffer with order
    // RGBA, which is the 4-channel and IPL_DEPTH_8U-depth OpenCV buffer        
    IplImage *img = cvCreateImageHeader(cvSize(width, height), IPL_DEPTH_8U, 4);

    cvSetImageData(img, imageData, width * 4);
    
    // convert 4 channels to 3 channels
    IplImage *pRed = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);
    IplImage *pGreen = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);
    IplImage *pBlue = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);
    IplImage *pAlpha = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);

    cvSplit(img, pBlue, pGreen, pRed, pAlpha);

    cvMerge(pBlue, pGreen, pRed, NULL, pOutImg);

 

    cvReleaseImage(&pRed);
    cvReleaseImage(&pBlue);
    cvReleaseImage(&pGreen);
    cvReleaseImage(&pAlpha);

    cvReleaseImageHeader(&img);
}

推荐一篇博文，关于cvsplit和cvMerge写得很不错

http://blog.sina.com.cn/s/blog_520a9c1d0100b8hr.html