matlab 图像锐化 图像增强 高通滤波 巴特沃斯-image enhancement matlab image sharpening high-pass filter 波巴特沃斯

对数字图像进行频域滤波，有Butterworth低通滤波、Butterworth高通滤波、指数低通滤波、指数高通滤波-Digital image frequency domain filtering, there Butterworth low-pass filter, Butterworth high-pass filter, low-pass filtering index, index of high-pass filtering