Filter

Algorithm

Filtering is a process in which each pixel value in a raster map is replaced with a new value. The new value is obtained by applying a certain function on each input pixel and its direct neighbours.

Based on the algorithm used by a filter, the following types of filters can be distinguished:

• linear filters
• rank order and median filters
• majority filters
• binary filters
• pattern filters
• standard deviation filters

Algorithms and examples are explained in the topics on the different filter types.

See also:

Filter : functionality

Filters : filter types

Filters : standard filters

Filters : user-defined filters

ILWIS objects : filters