说明：  matlab代码，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
(matlab code, digital image data display matrix and its Fourier transform, two-dimensional discrete cosine transform image compression, using gray-scale transformation method to enhance image contrast, histogram homogenization, analog image by Gaussian white noise and salt and pepper the impact of noise, using two-dimensional median filter function by medfilt2 of salt and pepper noise image filtering)