In RGB model, if r = g = B, color can be used to represent a gray color, and the value of R = g = B is called gray value. Therefore, each pixel of the gray image only needs one byte to store the gray value, and the gray range is 0-255 [17]. Generally, there are four methods to gray color image: component method, average method, maximum method and weighted average method. The following describes various graying methods:<br>
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