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Applying 2D filter on RGB image

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Ozan Can Sahin
Ozan Can Sahin on 17 Oct 2020
Answered: Subhadeep Koley on 3 Nov 2020 at 20:05
Hi all,
I'm having some troubles with applying a vector filter on RGB image, I'm not getting errors but I'm not getting an output which makes sense either. I'm losing at least one of the color channels somehow but I don't know what I'm doing wrong. You can find the application I'm trying to implement in the screenshot attached and I also attach the code to this entry. Looking forward to your help.
For the image I'm trying to upscale, you can get it here.
Thanks in advance

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Accepted Answer

Subhadeep Koley
Subhadeep Koley on 3 Nov 2020 at 20:05
Hi Ozan, the below code might help!
img = imread('kodim07.png');
imshow(img)
img = imresize(img, 2, 'bicubic');
figure
imshow(img)
% define filter kernel
kernel = [1, -5, 20, 20, -5, 1] / 32;
% extracting rgb channels individually
rChannel = img(:, :, 1);
gChannel = img(:, :, 2);
bChannel = img(:, :, 3);
% applying filter to the extracted matrices separately
rChannelNew = filter2(kernel, rChannel);
gChannelNew = filter2(kernel, gChannel);
bChannelNew = filter2(kernel, bChannel);
% concatenate matrices along 3rd dimension
outputImg = cat(3, rChannelNew, gChannelNew, bChannelNew);
% convert the numeric matrix to image
outputImg = mat2gray(outputImg);
figure
imshow(outputImg)

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