[Sls-mhdc] Entropy Coder Simplification (MHDC-A-1610-5(a)(3))

[Camarero Roberto]

Dear all,

Giving the little penalty showed in the paper, I'm more concerned about having a faster encoder than anything else.
The potential limitations addressed here do not seem to impact the way this standard will be used, at least for CNES needs (i.e. pixel-to-pixel quantization and/or for our typical bitrates).

My position is that I would prefer the adoption of this encoder too.

Regards 

Roberto

PS: Aaron, do you have a preliminary schedule for the next meeting? We are asked to book our flights as soon as possible in order to get lower fares! Thanks in advance!


 

-----Message d'origine-----
De : SLS-MHDC [mailto:sls-mhdc-bounces at mailman.ccsds.org] De la part de Kiely, Aaron B (332B)
Envoyé : mercredi 8 mars 2017 19:06
À : sls-mhdc at mailman.ccsds.org
Objet : [Sls-mhdc] Entropy Coder Simplification (MHDC-A-1610-5(a)(3))

Dear Working Group,

In response to action item MHDC-A-1610-5(a)(3), I have uploaded to the CWE the following document:
	CWE Private / 123.1-B / EntropyCoder-Simplification.pdf

The document describes Ian’s idea of a way to simplify the FLEX Interleaved Entropy Coder (IEC), completely eliminating the queue(!), and presents some performance results comparing compression effectiveness of the original and simplified IECs.

We have not implemented this in hardware, but I’ve discussed it with the person who did our FPGA implementation of the original FLEX entropy coder, and his impression is that this simplified version should be much faster.

My opinion is that this simplification addresses the desire of the WG to have a faster entropy coder, and the coding effectiveness of this simplified version is acceptable. So my recommendation is that we adopt this.

Please let me know your opinion.

I think a key question is whether the simplified entropy coder would prevent (or make it very difficult for) us to implement any of the optional features under consideration (relative error preservation, HVS quantization, rate control). I hope that those of you who are experts on these features can comment on whether the simplified IEC raises concerns.

Can reach a consensus by email in the next week or so?

Regards,
Aaron

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