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how to calculate gradient in c++ using Opencv?

asked 2017-03-29 03:37:22 -0500

kean gravatar image

updated 2017-03-29 03:58:19 -0500

Dear guys
I'm new in opencv, I'm looking for a simple method to find out how to calculate gradient of an image for sobel filter.

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answered 2017-03-30 01:37:25 -0500

berak gravatar image

the question might be a bit unclear, but i guess, you wanted the gradient, as in : "angles" and "magnitude", which might be achieved using 2 Sobel calls and cartToPolar

Mat img = ...
cvtColor(img, img, COLOR_BGR2GRAY);

Mat dx, dy; // 1st derivative in x,y
Sobel(img, dx, CV_32F, 1,0);
Sobel(img, dx, CV_32F, 0,1);

Mat angle, mag;
cartToPolar(dx, dy, mag, angle);
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Asked: 2017-03-29 03:37:22 -0500

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Last updated: Mar 30 '17