Computation of Non directional Edge

i want to compute non directional edge of an image block, how i can compute, the simple edge method, will return non directional edge? if no please suggest me the solution

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You can convolve with the Laplacian, which is like the average edge over all 4 directions (vertical, horizontal, and the two diagonals).

kernel = [-1, -1, -1; -1, 8, -1; -1, -1, -1];
highPassFilteredImage = conv2(double(originalGrayImage), kernel, 'same');

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Computation of Non directional Edge

Computation of Non directional Edge