哈工大数字信号处理_matlab用于数字图像处理

1、filename = I:IMG_5681.JPG; %文件路径imgRgb = imread(filename); % 读入一幅图像imshow(imgRgb);imfinfo(filename) % 查看图像文件信息 图像的读入与显示ans = Filename: I:IMG_5672.JPGFileModDate: 05-Apr-2013 09:48:18FileSize: 7746921Format: jpgFormatVersion: Width: 5184 Height: 3456BitDepth: 24ColorType: truecolorFormatSignature: Nu

2、mberOfSamples: 3CodingMethod: HuffmanCodingProcess: SequentialComment: 图像压缩I = imread(cameraman.tif); % 输入图像I = im2double(I); % 数据类型转换T = dctmtx(8); % 计算二维离散DCT矩阵dct = (x)T * x * T; % 设置函数句柄B = blkproc(I,8 8,dct); % 图像块处理mask = 1 1 1 1 0 0 0 0 % 掩膜 1 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0

3、 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;B2 = blkproc(B,8 8,(x)mask.* x); % 图像块处理invdct = (x)T * x * T; % 设置函数句柄I2 = blkproc(B2,8 8,invdct); % 图像块处理 subplot(1,2,1),imshow(I);title(原图);subplot(1,2,2), imshow(I2);title(压缩后); % 显示原始图像和压缩重构图像 真彩色增强clear;rgb=imread(I:d9049f163bfc7d2c4

4、b90a7c2.jpg);h=ones(5,5)/25;rgb2=imfilter(rgb,h);subplot(1,2,1);imshow(rgb);title(原图);subplot(1,2,2);imshow(rgb2);title(真彩色增强); 灰度调整I=imread(I:0.jpg);J=imadjust(I,.2 .3 0; .6 .7 1,0 1);K=imadjust(I,.1 .9,0 1);figure(1),imshow(I);title(原图);figure(2),imshow(J);title(调整1);figure(3),imshow(K);title(调整2)

5、; 提取图像的RGB分量rgb_image=imread(peppers.png);subplot(2,2,1),imshow(rgb_image)title(原图);fR=rgb_image(:,:,1);subplot(2,2,2),imshow(fR);title(红色分量);fG=rgb_image(:,:,2);subplot(2,2,3),imshow(fG)title(绿色分量);fB=rgb_image(:,:,3);subplot(2,2,4),imshow(fB)title(蓝色分量); 由RGB分量得到图像rgb_image=imread(peppers.png);sub

6、plot(2,2,1),imshow(rgb_image);title(原图);fR=rgb_image(:,:,1);fG=rgb_image(:,:,2);fB=rgb_image(:,:,3);rgb_red=cat(3,fR,zeros(size(fR),zeros(size(fR);subplot(2,2,2),imshow(rgb_red);title(红色分量图);rgb_green=cat(3,zeros(size(fR),fG,zeros(size(fR);subplot(2,2,3),imshow(rgb_green)title(绿色分量图);rgb_blue=cat(3,

7、zeros(size(fR),zeros(size(fR),fB);subplot(2,2,4),imshow(rgb_blue)title(蓝色分量图); RGB分量不同组合的图像rgb_image=imread(peppers.png);subplot(2,2,1),imshow(rgb_image)title(原图);fR=rgb_image(:,:,1);fG=rgb_image(:,:,2);fB=rgb_image(:,:,3);rgb_1=cat(3,fB,fR, fG);subplot(2,2,2),imshow(rgb_1)title(蓝红绿);rgb_2=cat(3,fR,

8、fR,fB);subplot(2,2,3),imshow(rgb_2)title(红红蓝);rgb_3=cat(3,fR,fR,fR);subplot(2,2,4),imshow(rgb_3)title(红红红); 索引图像处理 减少颜色数目近似显示clear;X, map = imread(trees.tif);imshow(X,map);title(原图);figure;Y, newmap = imapprox(X, map, 16,nodither);imshow(Y, newmap);title(原图的16色逼近);figure;X, map = imread(trees.tif);i

9、mshow(X,map);title(原图);figure;Y, newmap = imapprox(X, map, 16,dither);imshow(Y, newmap);title(采用抖动原图的16色逼近); 将黑白图像（二值图像、灰度图像） 转为彩色图像（RGB图像、索引图像)gray_image=imread(cameraman.tif);subplot(2,2,1),subimage(gray_image)X=grayslice(gray_image,16);subplot(2,2,2),subimage(X,gray(16)X=grayslice(gray_image,32);

10、subplot(2,2,3),subimage(X,hot)X=grayslice(gray_image,64);subplot(2,2,4),subimage(X,jet) 将黑白图像（二值图像、灰度图像） 转为彩色图像（RGB图像、索引图像)f=imread(cell.tif);imshow(f);map=zeros(8,3);map(2,3)=1;map(3,2)=1;map(4,2:3)=1;map(5,1)=1;map(6,1:2:3)=1;map(7,1:2)=1;map(8,1:3)=1;X=grayslice(f,8);figure;imshow(X,map) RGB彩色图像空间滤波 理论上，RGB