Image - calculating gradient

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Nima Azar
Nima Azar 2011-7-11
Hi all, I have a grayscale image. I need to calculate the gradient from where it's saturated to where it's fading out. Does matlab has a function for that? If not, do you have any ideas on how to do so?
thanks.

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回答（1 个）

Image Analyst
Image Analyst 2011-7-12
Did you look? If you had, you would have seen gradient(). You can also use conv2() or edge() or others. Post your image if you want more help.
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Nima Azar
Nima Azar 2011-7-12
So this image is very similar to what I'm dealing with:
http://www.buildtutorial.com/wp-content/uploads/2010/04/02-light-gradient.jpg
I need to select the area first then calculate the gradient on the image. Sorry I'm very new to matlab.
regards,
Image Analyst
Image Analyst 2011-7-12
And how do you want to select an area (before calculating the gradient)? Automatically based on intensity or something? Manually by having user trace some area?

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