how to extract horizontal and vertical garadients of image.

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pankaj chouthmal 2014-1-27

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评论： Image Analyst 2014-1-29

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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Answer 1

Anthony 2014-1-27

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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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Answer 2

Image Analyst 2014-1-27

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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;