Group 3: Descriptive Statistics on the GLC Matrix
The third group of GLCM texture measures consists of statistics derived from the GLC matrix. These are
- GLCM Mean,
- GLCM Variance (or Standard Deviation) and
- GLCM Correlation.
Similar statistics derived from the GL values in the original image (not the GLCM) are also used as indicators of texture, but not of GLCM texture. For example, it is easy to calculate the image mean within a window. However The GLCM Mean is expressed in terms of the GLCM. The pixel value is weighted not by its frequency of occurrence by itself (as in a "regular" or familiar mean equation) but by its frequency of its occurrence in combination with a certain neighbour pixel value.
Because of this possible confusion, when any measure in this group is used it should be clearly stated that it is the GLCM mean, or variance, or correlation that is being considered.
Click a buttons below to go to details and exercises for individual measures in this group.
Click next to go to GLCM Mean.