利用傅里叶平移变换性质实现图像平移matlab实现
时间: 2023-07-13 10:09:46 浏览: 119
在Matlab中,可以使用傅里叶变换的平移性质来实现图像平移。具体步骤如下:
1. 读入图像并进行傅里叶变换
```matlab
img = imread('test.png'); % 读入图像
img_fft = fft2(img); % 进行二维傅里叶变换
```
2. 构造平移矢量
```matlab
tx = 50; % 水平方向平移量
ty = 30; % 垂直方向平移量
[M, N] = size(img); % 获取图像尺寸
[X, Y] = meshgrid(1:N, 1:M); % 构造网格矩阵
shift = exp(-1i*2*pi*(tx*X/N + ty*Y/M)); % 构造平移矢量
```
3. 对傅里叶变换结果进行平移
```matlab
img_fft_shifted = img_fft .* shift; % 对傅里叶变换结果进行平移
```
4. 对平移后的傅里叶变换结果进行逆变换
```matlab
img_shifted = ifft2(img_fft_shifted); % 对平移后的傅里叶变换结果进行逆变换
```
5. 显示平移后的图像
```matlab
imshow(abs(img_shifted), []); % 显示平移后的图像
```
完整代码如下:
```matlab
img = imread('test.png'); % 读入图像
img_fft = fft2(img); % 进行二维傅里叶变换
tx = 50; % 水平方向平移量
ty = 30; % 垂直方向平移量
[M, N] = size(img); % 获取图像尺寸
[X, Y] = meshgrid(1:N, 1:M); % 构造网格矩阵
shift = exp(-1i*2*pi*(tx*X/N + ty*Y/M)); % 构造平移矢量
img_fft_shifted = img_fft .* shift; % 对傅里叶变换结果进行平移
img_shifted = ifft2(img_fft_shifted); % 对平移后的傅里叶变换结果进行逆变换
imshow(abs(img_shifted), []); % 显示平移后的图像
```
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