计算机图像处理实验七：图像几何变换技术（MATLAB）

痛定思痛。 2021-09-08 08:08 517阅读 0赞

> **【实验名称】**
> 
> 图像几何变换技术

> ** 【实验目的】**
> 
> 1、通过本次实验掌握图像几何变换技术；
> 
> 2、熟悉使用MATLAB库函数imresize、imrotate；

> ** 【实验内容】**
> 
> ![20210612204603275.png][]\*图1
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70][]

> ** 【实验代码】**
> 
> 题1
> 
>     clc;clear all;
>     figure;
>     img=imread('实验7图片.png');
>     imshow(img);
>     title('原图');
>     % 尺寸缩放
>     %缩小到原来的0.5倍
>     img1=imresize(img,0.5);
>     figure;
>     imshow(img1);
>     title('缩小0.5倍之后的图像');
>     
>     % 图片旋转
>     img2=imrotate(img,-30,'bilinear','crop');
>     figure;
>     imshow(img2);
>     title('旋转后的图像');
> 
> 题2
> 
>     clc;clear all;close all;
>     I=imread('实验7图片.png');
>     [m,n,k]=size(I);
>     tx=120;
>     ty=250;
>     ax=10;
>     ay=15;
>     for i=1:m
>         for j=1:n
>             x1=i+ax*sin(2*pi*j/tx);
>             y1=j+ay*sin(2*pi*i/ty);
>             i2=round(x1);
>             j2=round(y1);
>             if(j2<=n)&&(j2>=1)&&(i2<=m)&&(i2>=1);
>                 I4(i,j,:)=I(i2,j2,:);
>             else
>                 I4(i,j,:)=I(1,1,:);
>             end
>         end
>     end
>     figure
>     imshow(I);
>     title('原图');
>     figure
>     imshow(I4);
>     title('波动变换后图像');

> **【运行结果】**
> 
> 题1
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 2][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 3][]
> 
> 题2
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 4][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 5][]

[20210612204603275.png]: /images/20210813/3c12dfc22293499f8f22aab7e9736410.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70]: /images/20210813/239f4cc911ca49b28ce67762e5939079.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20210612204938963.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20210612204959726.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 3]: /images/20210813/882be5317fbc42b8a591ea855c9e4360.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20210612205102123.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDEwNzE0MA_size_16_color_FFFFFF_t_70 5]: /images/20210813/19ac97488b90472a94ae89c7859f1eb3.png