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代码说明：

  图像增强：空域增强；灰度直方图；平滑滤波器和锐化滤波器的使用；图像中值滤波增强的使用；低通滤波器和高通滤波器的使用 (Image Enhancement: Enhanced airspace gray histogram use of the smoothing filter and sharpening filter the use of the enhanced image median filtering the use of low-pass filter and high-pass filter)