public static CvMat CvGetSubRect(ref CvMat arr, ref CvMat submat, CvRect rect)
{
IntPtr p = cvGetSubRect(ref arr, ref submat, rect);
CvMat i = (CvMat)Marshal.PtrToStructure(p, typeof(CvMat));
i.ptr = p;
return(i);
}
private static void RoiParam(IplImage img, out int start, out int rows, out int elementCount, out int byteWidth, out int widthStep)
{
start = img.imageData.ToInt32();
widthStep = img.widthStep;
if (img.roi != IntPtr.Zero)
{
CvRect rec = NativeMethods.CvGetImageROI(ref img);
elementCount = rec.width * img.nChannels;
byteWidth = (img.depth >> 3) * elementCount;
start += rec.y * widthStep + (img.depth >> 3) * rec.x;
rows = rec.height;
}
else
{
byteWidth = widthStep;
elementCount = img.width * img.nChannels;
rows = img.height;
}
}
private static extern IntPtr cvGetSubRect(ref CvMat arr, ref CvMat submat, CvRect rect);