Huffman decoding

Huffman decoding

Portrait de 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

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Portrait de vladimir-dudnik (Intel)

Hi,

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

Regards,
Vladimir

Portrait de 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


Portrait de vladimir-dudnik (Intel)

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

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