用c语言实现的数字滤波的滑动平均法和低通滤波法-with C Language of the moving average filter and low-pass filter

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