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dropbox / lepton

Lepton is a tool and file format for losslessly compressing JPEGs by an average of 22%.
https://blogs.dropbox.com/tech/2016/07/lepton-image-compression-saving-22-losslessly-from-images-at-15mbs/
Apache License 2.0
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in lepton, which algorithm to implememnt the idct function? #145

Open xiaoxiongli opened 3 years ago

xiaoxiongli commented 3 years ago

Hi @danielrh ,

As you know, there are lots of fast method to implement DCT/IDCT, in lepton, it seems also use fast implement about it.

I wannat to know that which algorithm the lepton use to implememnt the idct function? Do you have some matial or paper?

thank you very much!