how to compute gradients of image using gradient() in matlab2010

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Pornima Birajdar
Pornima Birajdar 2015-7-23
编辑： Walter Roberson 2015-8-1
im=imread('31.png');
im=rgb2gray(im);
[gx,gy]=gradient(im);
gx1=fft(radon(log(abs(fft2(diff(gx))))));
gy1=fft(radon(log(abs(fft2(diff(gy))))));
gxy=gx+gy;
imshow(gxy);
getting error while computing gradient(im);

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回答（1 个）

David Young
David Young 2015-7-23
As Thorsten says, you should always post the error message. But here's a guess at what might help:
im=imread('31.png');
im=rgb2gray(im);
im = im2double(im);
[gx,gy]=gradient(im);
This converts the image array to a class which gradient can handle. It also rescales the values to the range 0-1, which improves code portability and makes subsequent display simpler.

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