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garyscale difference by row and column

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shri sant gadge baba
dear sir i want to find grayscale difference by row as well as column for image recognition plz help in this code

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Image Analyst
Image Analyst 2012-1-28
You can use imfilter, conv2, or graycomatrix. Maybe something like
kernel = [-1 -1 -1; -1 8 -1; -1 -1 -1];
differenceImage = conv2(inputImage, kernel);
Look them up, then refine your vague question and come back if you still can't figure out what to do.

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