The median filtering is a common method in image processing, but it is limited when it faces the swash noise of space high density, because it depends on the fixed Windows and the data points.

In the research on the existence and uniqueness of fixed points of operators as well as the method for finding them, the action of the relative lengthened degree was noticed about seventy years ago.

The traditional method of temperature detection cable uses the thermistors and thermocouples as temperature sensors. Usually the temperature sensors are installed in some fixed points in the cables.