Blurred Image after DCT image compression.

2015 10 8
1 个回答
更新时间：2015 10 8
2 次查看（30 天）

0 个投票

I'm building my own DCT compression code, and the resulting image is blurred and has visible blocks in it,something not present in the original image.
Here's the resulting image:
and here's the original image:
The code is as follows:
%Compression snippet
y = blockproc(x, [8,8], dct);
fun = @(block_struct) round(block_struct.data ./ m);
y = blockproc(y, [8,8], fun);
y = im2col(y, [8,8],'distinct');
% decompression snippet
x = col2im(z, [8 8], [xm xn], 'distinct');
fun = @(block_struct) (block_struct.data .* m);
y = blockproc(x, [8,8], fun);
size(y)
t = dctmtx(8);
dct = @(block_struct) t' * block_struct.data * t;
y = blockproc(y, [8,8], dct);
x = uint8(y + 128);
I didn't include all of the code.

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回答（1 个）

Thorsten
Thorsten 2015-10-8

0 个投票

It seems that you have reduced the resolution of the image by 8.

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Siyomnqoba
Siyomnqoba 2015-10-8
image size has gone up to still 775 by 775 I don't get how this has happened but when I use size(image) it still says the image size is 512 by 512 which is what it should be in the first place....what could've cause this change in resolution? I was supposed to embed a huffman encoder but I ran into problems with the decoder function decided to do it later,could this perhaps be the reason for this?that I didn't include the huffman encoder?

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