Need help on Image Gradient functions in matlab
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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.
回答（1 个）
Image Analyst
2013-2-3
0 个投票
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.
3 个评论
Walter Roberson
2015-9-20
matthew molteno commented
This hasn't been fully answered. Does gradient give the same result as imgradientxy?
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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