in lepton, which algorithm to implememnt the idct function?

[xiaoxiongli]

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!