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I'm a newbie in OpenCV, so I don't understand when reading this code below. Please explain to me what it means. uchar* ptr = (uchar) (image->imageData + yimage->widthStep);

I'm a newbie in OpenCV, so I don't understand when reading this code below. Please explain to me what it means. means.

I'm a newbie in OpenCV, so I don't understand when reading this code below. Please explain to me what it means.

uchar* ptr = (uchar) (uchar*) (image->imageData + yimage->widthStep);
y*image->widthStep);