Description: susan theoretical knowledge in Figure 1, the background image is white, there is a color in dim rectangle. On the image there five circular area. A circular area represents the area of the mask. The circular area of each position and the center pixel value compared to the value at the pixel, then the circle of the pixels can be divided into two categories, one is at the center pixel value and the pixel values are similar, and the other is the pixel value of the pixel values at the center of the relatively large difference. So, the first category (the center pixel value and the pixel values at similar) consisting of area is called USAN, USAN' s full name is " Univalue Segment Assimilating Nucleus" . Figure 2 shows the Figure 1 USAN circle area 5. Figure 2, the circle represents the white area is the area of the mask region USAN. USAN area characterizes the local structure of the image informat
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