几个关于数字图像处理入门的程序，包括直方图均衡、中值滤波、低通及高通滤波、图像恢复等。-Several procedures on the entry of digital image processing, including histogram equalization, median filter, low-pass and high-pass filtering, image restoration.

直方图均衡：增强图像的对比度，使暗的部分变亮，亮的的部分变暗，对光照强时具有较强的鲁棒性-Histogram equalization: to enhance image contrast, the dark parts brighter and dark parts brighter on light intensity, have a robust