Gradient Field of an Image...

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Philip
Philip 2011-2-17
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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Sean de Wolski
Sean de Wolski 2011-2-17
You can calculate the gradient using:
doc gradient
and then use the results from that for your quiver plot.
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Philip
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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