中文说明：
自编MATLAB程序，希望对大家有帮助，仅供大家参考，希望有用。
数字图像矩阵数据的显示及其傅立叶变换
二维离散余弦变换的图像压缩
采用灰度变换的方法增强图像的对比度
直方图均匀化
模拟图像受高斯白噪声和椒盐噪声的影响
采用二维中值滤波函数medfilt2对受椒盐噪声干扰的图像滤波
采用MATLAB中的函数filter2对受噪声干扰的图像进行均值滤波
图像的自适应魏纳滤波
运用5种不同的梯度增强法进行图像锐化
图像的高通滤波和掩模处理
利用巴特沃斯（Butterworth）低通滤波器对受噪声干扰的图像进行平滑处理
利用巴特沃斯（Butterworth）高通滤波器对图像进行锐化处理
English Description：
Self compiled matlab program, hope to help you, for your reference only, hope to be useful. Display of digital image matrix data and its Fourier transform Image compression based on two-dimensional discrete cosine transform The method of gray transformation is used to enhance the contrast of the image Histogram homogenization The simulated image is affected by Gaussian white noise and salt and pepper noise The two-dimensional median filter function medfilt 2 is used to filter the image disturbed by salt and pepper noise The function Filter2 in MATLAB is used to filter the mean value of the image disturbed by noise Adaptive Wiener filtering of image Five different gradient enhancement methods are used for image sharpening Image high pass filtering and mask processing The image disturbed by noise is smoothed by Butterworth low-pass filter The image is sharpened by Butterworth high pass filter