图像变换

图像平移

Image = im2double(imread('h.jpg'));
subplot(1,2,1),imshow(Image),title('原图');
[h,w,c] = size(Image);
NewImage = ones(h,w,c);
deltax = 40;
deltay = 40;
for x = 1:w   % 循环扫描新图像中的点
    for y = 1:h
        oldx = x - deltax;   % 确定新图像中的点在原图中的对应点
        oldy = y - deltay;
        if oldx > 0 && oldx < w && oldy > 0 && oldy < h %判断对应是否在图像内
           NewImage(y,x,:) = Image(oldy,oldx,:);
        end;
    end;
end;
subplot(1,2,2),imshow(NewImage),title('平移后');

图像翻转

Image1 = imread('g.jpg');subplot(2,2,1);imshow(Image1);title('原图')
HImage1 = flipdim(Image1,2);subplot(2,2,2);imshow(HImage1);title('按列翻转')
HImage2 = flipdim(Image1,1);subplot(2,2,3);imshow(HImage2);title('按行翻转')
HImage3 = flipdim(HImage1,1);subplot(2,2,4);imshow(HImage3);title('对角翻转')

图像旋转

Image4 = imread('1.bmp');subplot(1,3,1);imshow(Image4);title('原图');
NewImage4 = imrotate(Image4,45,"bilinear");
NewImage5 = imrotate(Image4,45);
subplot(1,3,2);imshow(NewImage4);title('双线性插值');
subplot(1,3,3);imshow(NewImage5);title('最邻近插值');

图像放大缩小错切 

clear;
Image = im2double(imread('h.jpg'));
tform1 = maketform('affine',[1 0 0;0.5 1 0;0 0 1]);
tform2=  maketform('affine',[1 0.5 0;0 1 0;0 0 1]);

NewImage = imresize(Image,2,'nearest');
NewImage1 = imresize(Image,0.5,'nearest');
NewImage2 = imtransform(Image,tform1);
NewImage3 = imtransform(Image,tform2);

subplot(2,3,1);imshow(Image);title('原图');
subplot(2,3,2);imshow(NewImage);title('放大2倍');
subplot(2,3,3);imshow(NewImage1);title('缩小0.5倍');
subplot(2,3,4);imshow(NewImage2);title('水平方向错切');
subplot(2,3,5);imshow(NewImage3);title('垂直平方向错切');

汇总

matlab GUI 窗口交互显示

创建GUI

命令行中输入：guide

放控件

编写触发函数

选中button ，右键

 

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)
axes(handles.axes1)  % axes1是控件“坐标区1”的tig
[fn,pn,~] = uigetfile('*.jpg','请选择要识别的图片');
global I;  %设置为全局变量，才能在不同控件函数中调用
I = imread([pn fn]);
imshow(I);
title('原图像');

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)
axes(handles.axes2);
global I;  %使用全局变量时，也要声明一下
HI = flipdim(I,2);
imshow(HI);
title('水平翻转');

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)
axes(handles.axes3);
global I;  %使用全局变量时，也要声明一下
tform1 = maketform('affine',[1 0 0;0.5 1 0;0 0 1]);
NewImage2 = imtransform(I,tform1);
imshow(NewImage2);

运行效果：