how wa can discard 75% of small coefficients after get the DCT conversion of each image block?
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Hi, i want to do this step on one image but i don't know how i can discard 75% of smal coefficients after get the DCT, please help me .
Can i do this without using for and if?
step:
Divide the input image into smaller blocks with dimensions nXn.
Get the DCT conversion of each image block.
Discard 75% of small coefficients.
Recreate and view the image
my code:
im=imread('s1.jpg');
im = rgb2gray(im);
figure;
imshow(im)
title('Original image');
img_dct=dct2(im);
figure;
imagesc(img_dct);
colormap(gray);
im_dct=idct2(img_dct);
title('DCT Compress Image');
figure;
imagesc(im_dct);
colormap(gray);
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Answers (1)
Jonas
on 30 May 2021
Edited: Jonas
on 30 May 2021
use the
Y = prctile(block,75,'all')
command to get the 75% percentile, you can then set all values smaller than this threshold to 0 by
block(block<=Y)=0;
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