GradientMaskOperator

Describes methods of image gradient computing.

Values of this enumeration:

• Sobel - See more: Sobel operator on Wikipedia
• Prewitt - See more: Prewitt operator on Wikipedia
• Scharr - See more: Scharr operator on Wikipedia
• Central - Only two direct neighbours of a pixel are used for computing
• Forward - Only one direct neighbour of a pixel is used for computing