数字图像处理技术-图像压缩

1

实验六 图像压缩

课程名称： 数字图像处理技术 实验日期： 2016-11-17

班级： 姓名： 学号：

一、实验目的

1．了解图像压缩的基本操作；

2．掌握行程编码算法、哈夫曼编码算法；

3. 掌握边缘检测的Matlab实现方法。

二、实验内容

1. 在GUI中，实现灰度图像、彩色图像的行程编码的编码器算法；进一步实现行程编码的解码器算法，并比较原图像和解码图像是否有区别。

2. 在GUI中，实现图像的边缘检测, 比较'roberts','sobel',算子的检测效果。

三、实验代码

function axes1_CreateFcn(hObject, eventdata, handles)

% hObject handle to axes1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles empty - handles not created until after all CreateFcns called

imshow('1.jpg')

% Hint: place code in OpeningFcn to populate axes1

% --- Executes on button press in pushbutton1.

function pushbutton1_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

figure;

A=imread('1.jpg');

image1=rgb2gray(A);

subplot(2,2,1);imshow(image1);

image2=image1(:);

image2length=length(image2);

for i=1:1:image2length

if image2(i)>=127

image2(i)=255;

else

image2(i)=0;

end

end 2

image3=reshape(image2,320,240);

subplot(2,2,2);imshow(image3);

X=image3(:);

x=1:1:length(X);

plot(x,X(x));

j=1;

image4(1)=1;

for z=1:1:(length(X)-1)

if X(z)==X(z+1)

image4(j)=image4(j)+1;

else

data(j)=X(z);

j=j+1;

image4(j)=1;

end

end

data(j)=X(length(X));

image4length=length(image4);

y=1:1:image4length;

plot(y,image4(y));

CR=image2length/image4length;

l=1;

for m=1:image4length

for n=1:1:image4(m);

rec_image(l)=data(m);

l=l+1;

end

end

u=1:1:length(rec_image);

plot(u,rec_image(u));

rec2_image=reshape(rec_image,320,240);

subplot(2,2,3);imshow(rec2_image);

% --- Executes on button press in pushbutton2.

function pushbutton2_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton2 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

figure;

clear all;

I1=imread('1.jpg');

I2=im2bw(I1,0.5);

I3=I2(:)';

I3len=length(I3); 3

j=1;n=1;

for z=1:(I3len-1)

if I3(z)==I3(z+1)

n=n+1;

else

pixel(j)=I3(z);

numpixel(j)=n;

j=j+1;

n=1;

end

end

pixel(j)=I3(z+1);

numpixel(j)=n;

pixel_len=length(pixel);

CR=I3len/pixel_len;

disp('压缩比：')

disp(CR);

disp('原图像数据的长度：')

disp(I3len);

disp('压缩后图像数据的长度：')

disp(pixel_len);

% --- Executes on button press in pushbutton3.

function pushbutton3_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton3 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

figure;

A=imread('095.jpg');

image1=rgb2gray(A);

figure;imshow(image1);

image2=image1(:);

image2length=length(image2);

for i=1:1:image2length

if image2(i)>=127

image2(i)=255;

else

image2(i)=0;

end

end

image3=reshape(image2,1360,1020);

figure;imshow(image3);

X=image3(:);

x=1:1:length(X); 4

figure;plot(x,X(x));

j=1;

image4(1)=1;

for z=1:1:(length(X)-1)

if X(z)==X(z+1)

image4(j)=image4(j)+1;

else

data(j)=X(z);

j=j+1;

image4(j)=1;

end

end

data(j)=X(length(X));

image4length=length(image4);

y=1:1:image4length ;

figure;plot(y,image4(y));

CR=image2length/image4length;

l=1;

for m=1:image4length

for n=1:1:image4(m);

rec_image(l)=data(m);

l=l+1;

end

end

u=1:1:length(rec_image);

figure;plot(u,rec_image(u));

rec2_image=reshape(rec_image,1360,1020);

figure;imshow(rec2_image);

% --- Executes on button press in pushbutton4.

function pushbutton4_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton4 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

figure;

A=imread('1.jpg');

image1=rgb2gray(A);

figure;imshow(image1);

image2=image1(:);

image2length=length(image2);

for i=1:1:image2length

if image2(i)>=127

image2(i)=255;