Image regions have sub-regions, which have different numbers of same-intensity pixels. Matrices can represent regions, and matrix cells can represent sub-regions. Cell values are number of same-intensity pixels. Matrices then have differences between cell sub-region values {Haar-like feature}, and matrices represent wavelets {Haar wavelet}. Regions are clusters or neighborhoods, such as rectangles or spheres, and so each region type has unique wavelet. Region sets have waves.
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Date Modified: 2022.0224