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How could be differentiation implemented within XCode Objective C or OpenCV ? (diff(BWImage) in matlab that is http://www.mathworks.com/help/techdoc/ref/diff.html)
You don’t need to implement it, it is already done, that’s what
cv::Sobeldoes. http://opencv.willowgarage.com/documentation/cpp/imgproc_image_filtering.html#cv-sobel