how to extract horizontal and vertical garadients of image.
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What is mean by horizontal and vertical gradients ? Suppose if we have 41*41 matrix or image, then how we can compute its horizontal and vertical gradients ?
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Anthony
2014 年 1 月 27 日
Hi,
You can use the diff function. Let img be your image :
img = spiral(10); % For example
gradX = diff(img,1,1);
gradY = diff(img,1,2);
doc diff
Hope it helps,
Anthony
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Image Analyst
2014 年 1 月 27 日
You can imgradientxy)() in the Image Processing Toolbox. From the help:
I = imread('coins.png');
[Gx, Gy] = imgradientxy(I,'prewitt');
figure
imshowpair(Gx, Gy, 'montage');
title('Directional Gradients: x-direction, Gx (left), y-direction, Gy (right), using Prewitt method')
axis off;
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pankaj chouthmal
2014 年 1 月 29 日
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Image Analyst
2014 年 1 月 29 日
The one that gets the job done for you. I don't really care as long as it works.
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