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kk=imread('ziji4.jpg'); X=rgb2gray(kk); X=double(X); [c,s]=wavedec2(X,2,'db4'); siz=s(size(s,1),:); ca1=appcoef2(c,s,'db4',1); a1=upcoef2('a',ca1,'db4',1,siz); chd1=detcoef2('h',c,s,1); hd1=

kk=imread('ziji3.jpg'); X=rgb2gray(kk); X=double(X); sX=size(X); [cA1,cH1,cV1,cD1]=dwt2(X,'db4'); A0=idwt2(cA1,cH1,cV1,cD1,'db4',sX); ans=max(max(abs(X-A0))) figure(1); subplot(121); im

kk=imread('ziji1.jpg'); X=rgb2gray(kk); X=double(X); [c,s]=wavedec2(X,2,'sym5'); a1=wrcoef2('a',c,s,'sym5',1); a2=wrcoef2('a',c,s,'sym5',2); hd2=wrcoef2('h',c,s,'sym5',2); vd2=wrcoef2('v',c,s,'

% 灰度图像JPEG 压缩 s091 I91=imread('1.jpg'); I910=rgb2gray(I91); I911=im2double(I910); T=dctmtx(8); B=blkproc(I911,[8,8],'P1*x*P2',T,T'); Mask=[1 1 1 1 0 0 0 0 1 1 1 0 0 0

% 度图像在两指定灰度范围间的凸性映射 s055 clear; I55=imread('1.jpg'); I550=rgb2gray(I55); I551=imadjust(I550,[0.11 0.91],[0 1],2.7); subplot(2,2,1),imshow(I550); subplot(2,2,2),imhist(I550); subplot(2,2,3),ims

% 灰度图像对数变换 s047 I47=imread('1.jpg'); I470=rgb2gray(I47); I471=im2double(I470); [m,n]=size(I470); q=1/log10(50); for i=1:m for j=1:n I472(i,j)=q*log10(1+49*I471(i,j)); end

% 灰度图像位面切分 s051 a=imread('1.jpg'); a=rgb2gray(a); s=im2double(a); [m,n]=size(a); for i=1:m for j=1:n s0=fix(s(i,j)*256); r7(i,j)=bitget(s0,8); r6(i,j)=bitget(s0,7); r5(i,j)=bitget(s0,6); r

% 位宽uint16转换为uint8 s037 I37=imread('1.jpg'); I370=rgb2gray(I37); I371=im2uint16(I370); I372=im2uint8(I371); I371(1:5,1:5),I372(1:5,1:5)

% 灰度图像取反 s043 I43=imread('1.jpg'); I430=rgb2gray(I43); I431=im2double(I430); [m,n]=size(I430); for i=1:m for j=1:n I432(i,j)=1-I431(i,j); end end I433=im2uint8(I432); imsho

%灰度图像调整幅度分辨率 s009 clear; I9=imread('1.jpg'); I90=rgb2gray(I9); subplot(2,4,1),imshow(I90,256); subplot(2,4,2),imshow(I90,128); subplot(2,4,3),imshow(I90,64); subplot(2,4,4),imshow(I90,32); su