<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">Hi Everyone,</div><div class=""><br class=""></div><div class="">Happily, Ian is correct and no change is needed to the Blue Book. Hopefully this incident can serve as a cautionary reminder of just how dangerous it is to spend too many hours staring at the Green Book.</div><div class=""><br class=""></div><div class="">Mark, when D=3, the test for setting the value of k can never produce a value of k=2 (see Annex F of the Green Book). It can produce a value of k=1, but the standard does not allow it. So all samples for an image with D=3 will be encoded as low-entropy samples. Performance would be better if we allowed k=1 in this case, but that would be one more code option to implement for negligible benefit.</div><div class=""><br class=""></div><div class="">Aaron</div><div class=""><br class=""></div><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Aug 4, 2021, at 7:48 AM, Wong, Englin (GSFC-5670) <<a href="mailto:mark.wong@nasa.gov" class="">mark.wong@nasa.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class="WordSection1"><p class="MsoNormal">Hi Aaron, <o:p class=""></o:p></p><p class="MsoNormal"><o:p class=""> </o:p></p><p class="MsoNormal">Is it correct to assume for D=3 case defined in current definition
<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">k_z(t)=2</span>, although rare, the compression is not optimal under the high entropy mode? Or, possibly not compressing?<o:p class=""></o:p></p><p class="MsoNormal">I agree with the changes proposed to put D=3 to be all low entropy samples if high entropy condition is rare. Also, I agree the note in
<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">5.4.3.3.5.1.4 needs to be updated as well.</span><o:p class=""></o:p></p><p class="MsoNormal"><o:p class=""> </o:p></p><p class="MsoNormal">Best,<b class=""><i class=""><span style="font-size: 10pt; font-family: "Calibri Light", sans-serif;" class=""><o:p class=""></o:p></span></i></b></p><p class="MsoNormal"><b class=""><i class=""><span style="font-size: 10pt; font-family: "Calibri Light", sans-serif;" class="">Mark Wong</span></i></b><span style="font-size: 10pt; font-family: "Calibri Light", sans-serif;" class="">
<o:p class=""></o:p></span></p><p class="MsoNormal"><i class=""><span style="font-size: 8pt; font-family: "Calibri Light", sans-serif;" class="">NASA GSFC Flight Microwave & Telecommunication Systems Branch<o:p class=""></o:p></span></i></p><p class="MsoNormal"><i class=""><span style="font-size: 8pt; font-family: "Calibri Light", sans-serif;" class="">Phone: 1-301-286-6549
<o:p class=""></o:p></span></i></p><p class="MsoNormal"><o:p class=""> </o:p></p>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in" class=""><p class="MsoNormal"><b class="">From:</b> SLS-DC <<a href="mailto:sls-dc-bounces@mailman.ccsds.org" class="">sls-dc-bounces@mailman.ccsds.org</a>> <b class="">On Behalf Of
</b><a href="mailto:Gian.Paolo.Calzolari@esa.int" class="">Gian.Paolo.Calzolari@esa.int</a><br class="">
<b class="">Sent:</b> Wednesday, August 4, 2021 4:26 AM<br class="">
<b class="">To:</b> Roberto.Camarero@esa.int<br class="">
<b class="">Cc:</b> sls-dc@mailman.ccsds.org; SLS-DC <sls-dc-bounces@mailman.ccsds.org><br class="">
<b class="">Subject:</b> [EXTERNAL] Re: [SLS-DC] 123B2 Corrigendum<o:p class=""></o:p></p>
</div><p class="MsoNormal"><o:p class=""> </o:p></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">Just an hint.</span>
<br class="">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">We have already a Technical Corrigendum 3 to CCSDS 123.0-B-2, Issued February 2019 and I fear the (unwritten) rule is that 3 is the maximum number of corrigenda.</span>
<br class="">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">Therefore you better check with Tom (cc'ed here) about this.</span>
<br class="">
<br class="">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">CIao</span> <br class="">
<br class="">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">Gian Paolo</span> <br class="">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">(Not AD :o)</span> <br class="">
<br class="">
<br class="">
<br class="">
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class="">From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class=""><a href="mailto:Roberto.Camarero@esa.int" class="">Roberto.Camarero@esa.int</a></span>
<br class="">
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class="">To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">"Kiely, Aaron B (US 332B)" <<a href="mailto:aaron.b.kiely@jpl.nasa.gov" class="">aaron.b.kiely@jpl.nasa.gov</a>></span>
<br class="">
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class="">Cc: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">"<a href="mailto:sls-dc@mailman.ccsds.org" class="">sls-dc@mailman.ccsds.org</a>" <<a href="mailto:sls-dc@mailman.ccsds.org" class="">sls-dc@mailman.ccsds.org</a>></span>
<br class="">
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class="">Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">04-08-21 09:52</span>
<br class="">
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class="">Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">Re: [SLS-DC] 123B2 Corrigendum</span>
<br class="">
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class="">Sent by: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">"SLS-DC" <<a href="mailto:sls-dc-bounces@mailman.ccsds.org" class="">sls-dc-bounces@mailman.ccsds.org</a>></span>
<o:p class=""></o:p></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif" class="">Dear Aaron, dear all,</span><span style="font-size:12.0pt" class="">
<br class="">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class=""><br class="">
Good catch Aaron.</span><span style="font-size:12.0pt" class=""> </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class=""><br class="">
My only question would be if we are not missing a definition for t>0 and D=3 in that case, in which k_z(t)=1 should be used according to Annex F in the Green Book.</span><span style="font-size:12.0pt" class="">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class=""><br class="">
If not, I understand that by this change we force D=3 samples to be encoded with low entropy codes only. In that case we should probably also change Annex F and the Note in 5.4.3.3.5.1.4 to "When D<=3, the condition...".</span><span style="font-size:12.0pt" class="">
<br class="">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class=""><br class="">
Kind regards,</span><span style="font-size:12.0pt" class=""> <br class="">
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class=""><br class="">
Roberto</span><span style="font-size:12.0pt" class=""> <br class="">
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From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">"Kiely, Aaron B (US 332B)" <<a href="mailto:aaron.b.kiely@jpl.nasa.gov" class="">aaron.b.kiely@jpl.nasa.gov</a>></span><span style="font-size:12.0pt" class="">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class=""><br class="">
To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">"<a href="mailto:sls-dc@mailman.ccsds.org" class="">sls-dc@mailman.ccsds.org</a>" <<a href="mailto:sls-dc@mailman.ccsds.org" class="">sls-dc@mailman.ccsds.org</a>></span><span style="font-size:12.0pt" class="">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class=""><br class="">
Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">08/04/2021 12:52 AM</span><span style="font-size:12.0pt" class="">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class=""><br class="">
Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">[SLS-DC] 123B2 Corrigendum</span><span style="font-size:12.0pt" class="">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F" class=""><br class="">
Sent by: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif" class="">"SLS-DC" <<a href="mailto:sls-dc-bounces@mailman.ccsds.org" class="">sls-dc-bounces@mailman.ccsds.org</a>></span><span style="font-size:12.0pt" class="">
</span><o:p class=""></o:p></p>
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<tt class="">Dear Working Group,</tt><br class="">
<br class="">
<tt class="">There is a minor issue with 123B2.</tt><br class="">
<br class="">
<tt class="">The NOTE in 5.4.3.3.5.2 of 123B2 states that, “For high-entropy samples, it can be shown that k_z(t)>=2.” In fact, as the standard is written this isn’t true, it’s just extremely rare – it can only happen when bit depth is D=3. (See Annex F of the Green
Book.)</tt><br class="">
<br class="">
<tt class="">We intended for the idea of this note to be normative, eliminating the need to implement a code that would be used only for a very special case. I believe we should request a corrigendum to do the following:</tt><br class="">
<tt class=""> 1. In 5.4.3.3.5.2, change</tt><br class="">
<tt class=""> k_z(t) is the largest positive integer k_z(t)<=max{D-2,2}, such that…</tt><br class="">
<tt class=""> to</tt><br class="">
<tt class=""> k_z(t) is the largest integer 2<=k_z(t)<=max{D-2,2}, such that…</tt><br class="">
<tt class=""> 2. Delete the NOTE in 5.4.3.3.5.2.</tt><br class="">
<tt class=""> 3. In 5.4.3.3.5.1.4, change</tt><br class="">
<tt class=""> For t>0…</tt><br class="">
<tt class=""> to</tt><br class="">
<tt class=""> For t>0 and D>3, …</tt><br class="">
<br class="">
<tt class="">Please let me know if this looks right, and if we have consensus I’ll forward this to the Editor and Area Director.</tt><br class="">
<br class="">
<tt class="">Thanks,</tt><br class="">
<tt class="">Aaron[attachment "smime.p7s" deleted by Roberto Camarero/estec/ESA] </tt><br class="">
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