同态滤波处理MATLAB实现
时间: 2023-11-07 07:11:39 浏览: 284
同态滤波是一种可以使图像在同时保留低频和高频信息的滤波方法。在MATLAB中,可以使用以下步骤实现同态滤波:
1. 读取需要进行同态滤波的图像,将其转换为灰度图像。
```matlab
img = imread('image.jpg');
gray_img = rgb2gray(img);
```
2. 对图像进行对数变换,将其转换为频域。
```matlab
img_d = im2double(gray_img);
img_log = log(1+img_d);
img_fft = fft2(img_log);
```
3. 设计同态滤波器,可以根据需要自行调整参数。
```matlab
sigma = 10;
gamma_l = 0.8;
gamma_h = 1.2;
c = 1;
[x, y] = meshgrid(-size(gray_img, 2)/2:size(gray_img, 2)/2-1, -size(gray_img, 1)/2:size(gray_img, 1)/2-1);
h = c.*(gamma_h - gamma_l).*(1 - exp(-0.5.*(x.^2 + y.^2)./(sigma.^2))).*exp(-0.5.*(gamma_l.*(x.^2 + y.^2))./(sigma.^2));
```
4. 对频域图像与同态滤波器进行卷积。
```matlab
img_filtered = real(ifft2(h.*img_fft));
```
5. 对过滤后的图像进行指数变换,将其转换回空域。
```matlab
img_exp = exp(img_filtered) - 1;
img_out = uint8(img_exp./max(img_exp(:)).*255);
```
6. 显示结果。
```matlab
imshow(img_out);
```
以上就是同态滤波在MATLAB中的实现方法。
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