Re: [AVTCORE] [Technical Errata Reported] RFC2435 (4094)
Magnus Westerlund <magnus.westerlund@ericsson.com> Thu, 29 January 2015 12:46 UTC
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Date: Thu, 29 Jan 2015 13:46:20 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Cc: juliusfriedman@gmail.com, avt@ietf.org
Subject: Re: [AVTCORE] [Technical Errata Reported] RFC2435 (4094)
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WG, I need your input on this Errata. Should it be held for document update or Rejected? The reason I think we can exclude the Verified option is that these table are verbatim from Annex K.1 of the JPEG specficiation (ISO/IEC 10918-1 : 1993(E)). I would also note the initial text in that annex preceding the tables: Two examples of quantization tables are given in Tables K.1 and K.2. These are based on psychovisual thresholding and are derived empirically using luminance and chrominance and 2:1 horizontal subsampling. These tables are provided as examples only and are not necessarily suitable for any particular application. These quantization values have been used with good results on 8-bit per sample luminance and chrominance images of the format illustrated in Figure 13. Note that these quantization values are appropriate for the DCT normalization defined in A.3.3. If these quantization values are divided by 2, the resulting reconstructed image is usually nearly indistinguishable from the source image. Please provide any input by the 13th of February. Cheers Magnus On 2014-09-04 16:33, RFC Errata System wrote: > The following errata report has been submitted for RFC2435, > "RTP Payload Format for JPEG-compressed Video". > > -------------------------------------- > You may review the report below and at: > http://www.rfc-editor.org/errata_search.php?rfc=2435&eid=4094 > > -------------------------------------- > Type: Technical > Reported by: Julius Richard Friedman <juliusfriedman@gmail.com> > > Section: Appendix A > > Original Text > ------------- > /* > * Table K.1 from JPEG spec. > */ > static const int jpeg_luma_quantizer[64] = { > 16, 11, 10, 16, 24, 40, 51, 61, > 12, 12, 14, 19, 26, 58, 60, 55, > 14, 13, 16, 24, 40, 57, 69, 56, > 14, 17, 22, 29, 51, 87, 80, 62, > 18, 22, 37, 56, 68, 109, 103, 77, > 24, 35, 55, 64, 81, 104, 113, 92, > 49, 64, 78, 87, 103, 121, 120, 101, > 72, 92, 95, 98, 112, 100, 103, 99 > }; > > /* > * Table K.2 from JPEG spec. > */ > static const int jpeg_chroma_quantizer[64] = { > 17, 18, 24, 47, 99, 99, 99, 99, > 18, 21, 26, 66, 99, 99, 99, 99, > 24, 26, 56, 99, 99, 99, 99, 99, > 47, 66, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99 > }; > > Corrected Text > -------------- > /* > * Table K.1 from JPEG spec. > */ > static const int jpeg_luma_quantizer[64] = { > 16, 11, 12, 14, 12, 10, 16, 14, > 13, 14, 18, 17, 16, 19, 24, 40, > 26, 24, 22, 22, 24, 49, 35, 37, > 29, 40, 58, 51, 61, 60, 57, 51, > 56, 55, 64, 72, 92, 78, 64, 68, > 87, 69, 55, 56, 80, 109, 81, 87, > 95, 98, 103, 104, 103, 62, 77, 113, > 121, 112, 100, 120, 92, 101, 103, 99, > }; > > /* > * Table K.2 from JPEG spec. > */ > static const int jpeg_chroma_quantizer[64] = { > 17, 18, 18, 24, 21, 24, 47, 26, > 26, 47, 99, 66, 56, 66, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99, > 99, 99, 99, 99, 99, 99, 99, 99 > }; > > Notes > ----- > Luma and Chroma was not in Zig Zag order and Luma energy has been de-saturated. > > Instructions: > ------------- > This erratum is currently posted as "Reported". If necessary, please > use "Reply All" to discuss whether it should be verified or > rejected. When a decision is reached, the verifying party (IESG) > can log in to change the status and edit the report, if necessary. > > -------------------------------------- > RFC2435 (no draft string recorded) > -------------------------------------- > Title : RTP Payload Format for JPEG-compressed Video > Publication Date : October 1998 > Author(s) : L. Berc, W. Fenner, R. Frederick, S. McCanne, P. Stewart > Category : PROPOSED STANDARD > Source : Audio/Video Transport > Area : Real-time Applications and Infrastructure > Stream : IETF > Verifying Party : IESG > > _______________________________________________ > Audio/Video Transport Core Maintenance > avt@ietf.org > https://www.ietf.org/mailman/listinfo/avt > -- Magnus Westerlund ---------------------------------------------------------------------- Services, Media and Network features, Ericsson Research EAB/TXM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [AVTCORE] [Technical Errata Reported] RFC2435 (40… RFC Errata System
- Re: [AVTCORE] [Technical Errata Reported] RFC2435… Magnus Westerlund
- Re: [AVTCORE] [Technical Errata Reported] RFC2435… Dale R. Worley
- Re: [AVTCORE] [Technical Errata Reported] RFC2435… Magnus Westerlund
- Re: [AVTCORE] [Technical Errata Reported] RFC2435… Julius Friedman
- Re: [AVTCORE] [Technical Errata Reported] RFC2435… Frederick, Ron
- Re: [AVTCORE] [Technical Errata Reported] RFC2435… Frederick, Ron
- [AVTCORE] [Errata Rejected] RFC2435 (4094) RFC Errata System