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Discussion Groups | Matlab DSP | gradient of an image

Technical discussion about Matlab and issues related to Digital Signal Processing.

  

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gradient of an image - ceg9901 - Jan 28 2:43:00 2005



Hi,
How to find horizontal and vertical gradidnet of an image.is there
any command derivation of an image?.







Re: gradient of an image - Joe Sababa - Feb 1 18:08:00 2005



--- ceg9901 <> wrote: >
> Hi,
> How to find horizontal and vertical gradidnet of an
> image.is there
> any command derivation of an image?.
>
Hi,
Follow these steps:
1)Get the matrix:
M=getframe(gca); % assuming it is already displayed.
If not, use imread.
P=frame2im(M);
2)
a) If it is a BW image go to next step.
b) If it is a colored image: P=rgb2gray(P); % Need
images toolbox. Otherwise: P=sum(double(P,3))/3
3)[Dx,Dy] = gradient(P);

Cheers,

Joe Sababa

BSTeX - Equation viewer for Matlab
http://www.geocities.com/bstex2001/ __________________________________