7.2.1. Features for Texture Characterization
The texture of an image region is determined by the way the gray levels are distributed over the pixels in this region. Although there is no clear definition of “texture,” we are all in a position to describe an image by the look of it as fine or coarse, smooth or irregular, homogeneous or inhomogeneous, and so forth. Our goal in this subsection is to generate appropriate features that somehow quantify these properties of an image region. These features will emerge by exploiting space relations underlying the gray-level distribution.
First-Order Statistics Features
Let I be the random variable representing the gray levels in the region of interest. The first-order histogram P(I) is defined as
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