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I am a Varied Artist
MugFunky
Male/Australia
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Last Visit: 320 weeks ago
Adrian or Sally
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hey yall, thought i'd put some new stuff up here. photos from the quickly growing pile on my computer. since i discovered burst shooting i've been taking WAY too many and having to painstakingly choose the best out of up to 20 identical shots...
uhm..................i've a photaographick background.......so....what are DCT coeficients????????? dynamic.......color..tone????????it sounds kinda signal related....frequencyspace?
JPEG (and any of the "PEG" formats) work by grabbing 8x8 blocks of pixels and transforming them into an 8x8 matrix of coefficients called a Discrete Cosine Transform (DCT). the compression is achieved by either zeroing or storing the coefficients in lower precision.
basically it is frequency space... thing is grain is high frequencies that would normally be zeroed, meaning there's more space being used up, and less precision to go round in the lower frequencies.
thanks it is a bit geeky but it interests me, i am struggeliong throgh the image processing cookbook right now, and try to make sense of that
where i work we are planning to implement several packages that use fft filtering for image improvemenet on fingerprint analysis.
it works ? but now i nee to find out why it works
but it's fun
Sta.sh
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Associate Editor, Vectortuts+
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GraphicRiver
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PORNOGRAPHY!
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Join Team ~chintzy> The sick child of =lounge-acting
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Associate Editor, Vectortuts+
Tuts+ Marketplace
GraphicRiver
[link]
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Associate Editor, Vectortuts+
Tuts+ Marketplace
GraphicRiver
[link]
JPEG (and any of the "PEG" formats) work by grabbing 8x8 blocks of pixels and transforming them into an 8x8 matrix of coefficients called a Discrete Cosine Transform (DCT). the compression is achieved by either zeroing or storing the coefficients in lower precision.
basically it is frequency space... thing is grain is high frequencies that would normally be zeroed, meaning there's more space being used up, and less precision to go round in the lower frequencies.
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Sallysallysallysally
where i work we are planning to implement several packages that use fft filtering for image improvemenet on fingerprint analysis.
it works ?
but it's fun