Point operations

Point operations are very simple but quite popular low-level image processing operations.

Definition:

A point operation F [·] transforms an input image u(n₁,n₂) into an output image y(n₁,n₂) according to the formula

Interpretation:

The point operation is completely specified by the function F [·] that defines the mapping of the input gray-level image into the output gray-level image, or the components of the input color/multispectral image into the components of the output color/multispectral image.

Point operations may be viewed as sample-by-sample copying operations that modify scalar or vector sample values in a predefined way.