图像在传输过程中，传递函数对高频成分有衰减作用，造成图像模糊，细节轮廓不清楚。图像锐化就是补偿图像的轮廓，增强图像的边缘及灰度跳变的部分，使图像变得清晰。亦分空域处理和频域处理两类[3]。-Image in the transmission process, the transfer function of the role of high frequency components are attenuated, resulting in image blurring, the details of the outline is not clear. Image sharpening is the outline of the image compensation, edge enhancement and gray-scale image of the hopping part of the image became clear. Also sub-space and frequency domain processing to deal with two types of [3].