Texture is one of the visual features believed to have role in segmentation.
There have been several attempts to define texture in the literature, yet there is no satisfactory one currently available. Intuitively, texture is related to patterned variations in the image. It is, therefore, natural to deduce that texture is a region property, not a point property. Accordingly, all methods extract features from a region of certain size. Among several approaches, a method based on signal processing ideas is called a linear system theory approach.