Low pass filter on Y U and V bands

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rest12
rest12 on 16 Oct 2013
Edited: Yatin on 17 Oct 2013
I want to implement low pass filter on Y, U and V bands of image by a factor of 3 in both horizontal and vertical directions. I write a code but i want to confirm that whether the code which I write is correct or not? Please confirm. Code is written below:
rgbImage = imread('fav.png');
R = rgbImage(:, :, 1);
G = rgbImage(:, :, 2);
B = rgbImage(:, :, 3);
Y = 0.299*R + 0.587*G + 0.114*B;
U = - 0.14713*R - 0.28886*G + 0.436*B;
V = 0.615*R - 0.51499*G - 0.10001*B;
subplot(2,2,1);
imshow(rgbImage);
title('Original Image');
hsize = 3;
H = fspecial('average', hsize);
filteredY = imfilter(Y, H);
subplot(2,2,2);
imshow(filteredY);
title('filteredY');
filteredU = imfilter(U, H);
subplot(2,2,3);
imshow(filteredU);
title('filteredU');
filteredV = imfilter(V, H);
subplot(2,2,4);
imshow(filteredV);
title('filteredV');
  1 Comment
Walter Roberson
Walter Roberson on 17 Oct 2013
When you display the bands, what colormap are you wanting to use?

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Accepted Answer

Yatin
Yatin on 17 Oct 2013
Edited: Yatin on 17 Oct 2013
Hello,
Your code seems to work correctly and it certainly does low-pass filtering on Y, U and V. You can also however, try using the gaussian low pass filter and compare the result for different sigma values with the results from the averaging filter.
You can have a look at the documentation here:

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