how to find the gradient of pixels in angular direction?

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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.

Answers (2)

Matt J
Matt J on 2 Jan 2013
Edited: Matt J on 2 Jan 2013
Let H be the horizontal gradient and V be the vertical gradient. Then
will give a directional derivative at 30 degrees.

Mehri Mehrnia
Mehri Mehrnia on 11 Jul 2022
Edited: Mehri Mehrnia on 11 Jul 2022
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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