Huffman decoding

figo · ‎07-02-2004

Hello,
I am doing JPEG decoding with the function DecodeHuffman8x8_JPEG.
Can anyone describe how the calculation of the AC and DC coefficient tables and the RRRRSSSS coding are implemented in the IPP library?

Thanks

Vladimir_Dudnik · ‎07-05-2004

Hi,

what do you mean? The calculations are made according ISO/IEC-10918-1. Is it answer you question?

Regards,
Vladimir

figo · ‎09-14-2004

Can you clarify? Does this mean that all JPEG codec calculations of the AC and DC coefficients in the IPP are Huffman entropy encoded and decoded in accordance with ISO/IEC-10918-1? If not, what other solutions are used?

Thanks

Vladimir_Dudnik · ‎09-21-2004

Hi,

On JPEG encoder side DC and AC coefficients are calculated through DCT, and after quantization they are Huffman encoded with using HUffman tables which built according with ISO/IEC 10918-1 (see Annex C, Huffman table specification). There is no other solutions if you want to build standard compliant JPEG codec.

Regards,

Vladimir