基于Matlab实现离散余弦、离散傅里叶变换对图片进行压缩（源码+图片）.rar

clear; clc; close all; figure; origin = imread('autumn.tif'); imshow(origin); title('原图'); ratio = 1.0; [z, k] = fft_compress(origin, ratio); figure; subplot(3, 2, 1); imshow(z); subplot(3, 2, 2); imshow(k), title( ['FFT 压缩比率:',num2str(ratio)]); ratio = 0.6; [z, k] = fft_compress(origin, ratio); subplot(3, 2, 3); imshow(z); subplot(3, 2, 4); imshow(k), title( ['FFT 压缩比率:',num2str(ratio)]); ratio = 0.3; [z, k] = fft_compress(origin, ratio); subplot(3, 2, 5); imshow(z); subplot(3, 2, 6); imshow(k), title( ['FFT 压缩比率:',num2str(ratio)]); ratio = 1.0; [z, k] = dct_compress(origin, ratio); figure; subplot(3, 2, 1); imshow(z); subplot(3, 2, 2); imshow(k), title( ['DCT 压缩比率:',num2str(ratio)]); ratio = 0.6; [z, k] = fft_compress(origin, ratio); subplot(3, 2, 3); imshow(z); subplot(3, 2, 4); imshow(k), title( ['DCT 压缩比率:',num2str(ratio)]); ratio = 0.3; [z, k] = fft_compress(origin, ratio); subplot(3, 2, 5); imshow(z); subplot(3, 2, 6); imshow(k), title( ['DCT 压缩比率:',num2str(ratio)]);