Roberts cross

The Roberts cross operator is used in image processing and computer vision for edge detection.

However with the speed of computers today this advantage is negligible and the Roberts cross suffers greatly from sensitivity to noise.

Things got even worse nine minutes later, when Green dived low to head home a Gareth Roberts cross.

Other first-order difference operators for estimating image gradient have been proposed in the Prewitt operator, Roberts cross and Frei-Chen.

As a differential operator, the idea behind the Roberts cross operator is to approximate the gradient of an image through discrete differentiation which is achieved by computing the sum of the squares of the differences between diagonally adjacent pixels.