Low pass filter on Y U and V bands

Question

rest12 2013-10-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/90422-low-pass-filter-on-y-u-and-v-bands

编辑： Yatin 2013-10-17

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');

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Walter Roberson 2013-10-17

When you display the bands, what colormap are you wanting to use?

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Answer 1

Yatin 2013-10-17

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/90422-low-pass-filter-on-y-u-and-v-bands#answer_100023

编辑：Yatin 2013-10-17

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:

http://www.mathworks.com/help/images/ref/fspecial.html