中文说明：图像增强是一个真正的预处理部分
English Description：
Image enhancement is really a preprocessing part of many image processing applications. The basic aim of image enhancement is to enhance the interpretability or perception of data in images for human viewers, or to supply better input for other automated image processing techniques. There are various reasons for low quality of a graphic such as for instance distortion being introduced by the imaging systems, insufficient expertise of the operator or the adverse external conditions at the time of image acquisition.