Sobel

Process a gray image with the Sobel gradient filter.

The in_gray image is filtered with the Sobel masks:

     [-1/4    0    1/4]
Sx = [-1/2    0    1/2]
     [-1/4    0    1/4]
    
     [-1/4  -1/2  -1/4]
Sy = [  0     0     0 ]
     [1/4    1/2   1/4]

The result out_gradient is computed as:

out_gradient.x = in_gray * Sx
out_gradient.y = in_gray * Sy

The border is clamped to the edges of the image.

Inputs

in_gray : ImageView r8ui image.

Outputs

out_gradient : ImageView rg32f image. The image gradient.