3 x 3 Sobel Operator

Horizontal and vertical kernels are evaluated in parallel.

Behavior

• gx = (p02+2*p12+p22) - (p00+2*p10+p20).
• gy = (p20+2*p21+p22) - (p00+2*p01+p02).
• magnitude equals abs(gx)+abs(gy) and is limited to 2040.