Need help on Image Gradient functions in matlab

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.. Vamshi
.. Vamshi 2013-2-1
评论： Image Analyst 2015-9-20
I want to calculate the gradient direction of an image.
I would like to know the differences between gradient, imgradient, imgradientxy functions in matlab.
What's the difference between gradient direction and directional gradient?
Please help.
Thanks in Advance.

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回答（1 个）

Image Analyst
Image Analyst 2013-2-3
Did you look in the help? gradient is the slope of an image along a direction. imgradient returns the max gradient and the direction the max slope occurs along. Other functions may give you the vertical, horizontal, or average gradient - depends on the function.
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Walter Roberson
Walter Roberson 2015-9-20
matthew molteno commented
This hasn't been fully answered. Does gradient give the same result as imgradientxy?
Image Analyst
Image Analyst 2015-9-20
gradient uses the Laplacian while imgradient uses Prewitt or Sobel filters to give the gradient.
imgradient gives magnitude and direction while imgradientxy give the derivative in strictly the x and y direction. Kind of like giving x and y instead of sqrt(x^2+y^2) and atan(y/x).

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