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image compressing with DCT

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adi
adi 2011-11-22
what is the coding Elimination of DCT coefficients for jpeg image compression ?? i using matlab R2008a
help me..
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Walter Roberson
Walter Roberson 2011-11-22
I do not understand this question as phrased, unless it is a duplicate of your other question http://www.mathworks.com/matlabcentral/answers/21891-jpeg-image-compressing-with-dct

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回答（1 个）

Hamrit
Hamrit 2012-5-13
dvalue=imread('yourimage');
dvalue = double(dvalue)/255;
dvalue = rgb2gray(dvalue);
imshow(dvalue)
img_dct=dct2(dvalue);
img_pow=(img_dct).^2;
img_pow=img_pow(:);
[B,index]=sort(img_pow);%no zig-zag
B=flipud(B);
index=flipud(index);
compressed_dct=zeros(size(dvalue));
coeff = 20000;% maybe change the value
for k=1:coeff
compressed_dct(index(k))=img_dct(index(k));
end
im=idct2(compressed_dct);
imwrite(im, 'Hassan.jpg')
not for color Jpeg

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