Huffman decoding

[figo]

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]

Hi,

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

Regards,
Vladimir

[figo]

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]

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