1. ARUint8 *dataPtr;
    IplImage *image_opencv, *gray_opencv;
    
    //ARToolkit→OpenCV
    image_opencv = cvCreateImage(cvSize(arImXsize, arImYsize), IPL_DEPTH_8U, 4);
    memcpy(image_opencv->imageData, dataPtr, image_opencv->imageSize);
    
    //何らかの処理
    gray_opencv = cvCreateImage(cvSize(arImXsize, arImYsize), IPL_DEPTH_8U, 1);
    cvCvtColor(image_opencv, gray_opencv, CV_BGRA2GRAY);
    cvAdaptiveThreshold(gray_opencv, gray_opencv, 255, CV_ADAPTIVE_THRESH_MEAN_C, CV_THRESH_BINARY, 11, 10);
    cvCvtColor(gray_opencv, image_opencv, CV_GRAY2BGRA);
    
    //OpenCV→ARToolkit
    dataPtr = (ARUint8*)(image_opencv->imageData);