如何在MATLAB中应用滤波器？

Question

我的问题是如何在MATLAB的中心应用5×5拉普拉斯滤波器？

我试试这个代码，但它不工作

kAvg = fspecial('average',[5 5]); 
kLap = fspecial('laplacian'); 

Answer 1

按照documentation，您可以使用imfilter应用过滤器：

I = imread('cameraman.tif'); 
kLap = fspecial('laplacian'); 
filtered = imfilter(I,kLap,'replicate'); 
imshow(filtered); title('Filtered Image'); 

编辑：我只是意识到你问什么for：

I = imread('cameraman.tif'); 

% simple high pass filter 
kLap = [-1, -1, -1; 
     -1, 8, -1; 
     -1, -1, -1]; 

filtered_3x3 = imfilter(I,kLap,'replicate'); 
imshow(filtered_3x3); title('Filtered Image (3x3)'); 
pause(); 

% another simple high pass filter 
kLap = [-1 -3 -4 -3 -1; 
     -3 0 6 0 -3; 
     -4 6 20 6 -4; 
     -3 0 6 0 -3; 
     -1 -3 -4 -3 -1]; 

filtered_5x5 = imfilter(I,kLap,'replicate'); 
imshow(filtered_5x5); title('Filtered Image (5x5)');