[Mp4-tech] How to quantize the coefficients in advanced intra coding of h.263+?

[Gary Sullivan]

Darui Sun et al,
There are several documents available on that subject.
I believe the TMN12 design is the result of my contribution Q15-D-30 of April 1998, which can be found in:
http://ftp3.itu.ch/av-arch/video-site/9804_Tam/
The software that you're referring to was probably based on an older TMN design.
For further background education and information on how to design a better quantization rule than either one of those, I suggest starting with the documents listed below and following the trail of references in them to the extent that your curiosity leads you:
JVT-O014  (Note: after the dash, the next character is the letter "O" and the next character after that is the numberal "0".)
JVT-P015
JVT-N011
Those can be found in http://ftp3.itu.int/av-arch/jvt-site.
The adaptive technique described in those three documents is now supported in recent versions of the JM reference software.
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: mp4-tech-bounces lists.mpegif.org
+> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Darui.Sun
+> Sent: Wednesday, September 05, 2023 12:16 AM
+> To: Gary Sullivan; mp4-tech lists.mpegif.org
+> Subject: [Mp4-tech] How to quantize the coefficients in
+> advanced intra coding of h.263+?
+>
+> hi, experts,
+>
+>    In reference encoder of h.263+, the quantization for
+> advanced intra coding is calculated as follows,
+>      |LEVEL| = (|COF| + QUANT / 2) / (2 * QUANT)
+>
+>    but in the Test model (for example TMN12)£¬ the equation
+> is as follows,
+>      |LEVEL| = (|COF| + 3 * QUANT / 4) / (2 * QUANT)
+>
+>
+>    Why is the quantization different? could anybody clarify
+> it for me£¿
+>
+> thanks in advance
+>
+> sun
+>
+>
+>
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