图像增强的目的就是对退化的图像进行处理，使其在一定程度上复原成没有退化前的理想图像。
The aim of image enhancement is to process the degenerated images to recover to the ideal image before degeneration.
当数以百万计的人们观看同一电视节目时，整个世界成了一个小村庄，社会退化到文字出现前状况。
When millions watch the same programmes, the whole world becomes a village, and society is reduced to the conditions which obtain in preliterate communities.
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