how to get gradient of an image
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hi im having a hyperspectral image and im trying to get the gradient operators of the horizontal and vertical directions but i can't any help? Thanks
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Walter Roberson
le 8 Avr 2013
for band = 1 : size(X,3)
[GX(:,:,band), GY(:,:,band)] = gradient(X(:,:,band));
end
Note you get out two matrices the same size as the original.
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Image Analyst
le 25 Mar 2013
The Image Processing Toolbox has imgradient() and imgradientxy() functions.
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Image Analyst
le 8 Avr 2013
Déplacé(e) : DGM
le 29 Déc 2023
That does not make sense to me. In the lateral x,y direction you have units of "per pixel" but in the Z direction since the planes are different wavelengths, not distance in pixels, the gradient is not a spatial gradient. It would have units of "per wavelength". And you certainly wouldn't want a 3D gradient with spatial coordinates mixed with wavelength coordinates. It makes no sense, at least not to me.
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