实现图像增强，改变图像对比度、灰度变换、直方图均衡化、观察平均、中值、自适应滤波的效果，用锐化算子对图像进行锐化处理-To achieve image enhancement, change the image contrast, gray-scale transformation, histogram equalization, observe the average, median, adaptive filtering effect, with the operator of the im