Gradient Field of an Image...

Question

Philip 2011-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/1501-gradient-field-of-an-image

Hi,

Does anyone know how to calculate the gradient field of an image? I have checked the use of Quiver plots to achieve this, but am having difficulties applying it to an image...

Many thanks in advance for any help anyone can give!

Phil

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Answer 1

Sean de Wolski 2011-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/1501-gradient-field-of-an-image#answer_2229

在 MATLAB Online 中打开

You can calculate the gradient using:

doc gradient

and then use the results from that for your quiver plot.

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Philip 2011-2-21

Thanks! I think this should be on the right lines, but I'm having a few issues using quiver... How can I overlay the gradient field for the entire image?

I am currently using:

[gx gy] = gradient(dens,.2,.2);

figure('name','Gradient');

imshow(img(1:r,1:c),'InitialMagnification','fit');

hold on;

quiver(gx(1:r,1:c),gy(1:r,1:c));

title('Gradient Field');

And after some processing time, I just get back a completely blue figure... Do you happen to know what I am doing wrong?

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