how to find the gradient of pixels in angular direction?

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prasad
prasad 2013-1-2
编辑： Mehri Mehrnia 2022-7-11
i wish to find gradient of pixels which are at an angle of 30 degrees with the central pixel of the block. How can I do this? because the usual gradient operators like sobel,prewitt will allow finding gradient only in the horizontal or vertical direction and not in angular.

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回答（2 个）

Matt J
Matt J 2013-1-2
编辑：Matt J 2013-1-2
Let H be the horizontal gradient and V be the vertical gradient. Then
H*cosd(30)+V*sind(30)
will give a directional derivative at 30 degrees.
Mehri Mehrnia
Mehri Mehrnia 2022-7-11
编辑：Mehri Mehrnia 2022-7-11
If I want to find the norm of edge, should I replace 30 with 90 in the above formula?
Is "H*cosd(30)+V*sind(30)" a vector or point?

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