中心化后的傅里叶谱，傅里叶频谱和平均值,计算图像的平均值-Fourier spectrum and average value

傅里叶变换，中心化，然后取幅值，利用log函数增强再输出-Fourier transform, the center, and then take the amplitude, enhanced and then output the log function

下载图片然后傅立叶变换 展示频谱 计算灰度级平均值 使用高斯低通滤波器，可以指定size,m*n，高斯函数的中心位置。 用例图做高斯低通滤波。((a)Download Fig. 4.41(a) from the book web site and compute its (centered) Fourier spectrum. (b) Display the spectrum. (c) Use your result in (a) to compute the average val

首先对采样信号进行傅里叶变换，计算出功率谱或幅值谱，然后用功率谱或者幅值谱的数据，计算每一个中心频率的带宽内数据的平均值。(Firstly, Fourier transform is applied to the sampled signal to calculate the power spectrum or amplitude spectrum, and then the average value of the data within the bandwidth of each cente