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

[Raffaele.Vitulli at esa.int]

Dear working group,

the simplified version of the FLEX encoder will have some impacts on our
implementation, we are working on this but it should be easily solved in a
few days.
Regarding  the coding effectiveness of the simplified version, I propose to
discuss the results at the next WG meeting.

Regards

R. Vitulli




From:	"Kiely, Aaron B (332B)" <aaron.b.kiely at jpl.nasa.gov>
To:	"sls-mhdc at mailman.ccsds.org" <sls-mhdc at mailman.ccsds.org>
Date:	08/03/2017 19:06
Subject:	[Sls-mhdc] Entropy Coder Simplification (MHDC-A-1610-5(a)(3))
Sent by:	"SLS-MHDC" <sls-mhdc-bounces at mailman.ccsds.org>



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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