MATLAB: How to encode a low pass filter to an image

digital image processingimageimage analysisimage processing

Hi, I'm quite new to Matlab. im trying to write an encoded code to filter an image. i'm using the following filter code. filter = 1/9 * [1 1 1; 1 1 1; 1 1 1];

i get the message "matrix dimensions must agree", how would you go about filtering a whole image? do i have to loop it somehow? thanks

Best Answer

You can do this using blocproc. Read about blocproc.

Related Solutions

MATLAB: High pass filter implement on a image

There may be no ideal filter. Here's one possibility:

kernel = [-1 -1 -1;-1 8 -1;-1 -1 -1];
filteredImage = imfilter(grayImage, kernel, 'same');

You could also do filtering in the Fourier domain if you want.

MATLAB: How to apply a filter to an image

First you need to declare and read your picture:

img = imread('your_picture.bmp');

If you have already created matrices according to the assignment C - i. And ii. and that would be something like this:

I = [1/9 1/9 1/9;1/9 1/9 1/9;1/9 1/9 1/9];
II = [-1 -1 0;-1 0 1;0 1 1];

Finally, you want to use an imfilter() to filter image separately with created filters (matrices):

filtered_img1 = imfilter(img, I);
filtered_img2 = imfilter(img, II);

And if you want to show filtered images both at the same time:

subplot(121)
imshow(filtered_img1)
subplot(122)
imshow(filtered_img2)

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Related Solutions

MATLAB: High pass filter implement on a image

MATLAB: How to apply a filter to an image

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