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how to compute edge from gradient in an image?

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rajesh
rajesh am 6 Mai 2013
gradient of and image is gradient(f)=[∂f/∂x, ∂f/∂y]=[fx,fy] θ=arctan (fy / fx) ,|| f||gives the magnitude. The angle for edges is θ=arctan (-fx/ fy) We know,edges are perpendicular to gradient ,but how to calculate edges with angle and magnitude in matlab.
please help........

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Image Analyst
Image Analyst am 6 Mai 2013
Did you look in the help? Do you have the Image Processing Toolbox? Did you see imgradient() and imgradientxy()?

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