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<div class="moz-cite-prefix">A similar term to 'reversible' is
'lossless', contrasted with 'lossy'. <br>
<br>
Translations across natural languages (between humans) are
inherently lossy, and for other than the simplest texts,
irreversible. <br>
<br>
Image transformation processes are often characterized as either
lossy (and probably irreversible) or lossless. An example of
lossy transformation is image digitization, for example where a
scanner converts an analog image to a pixel stream. A lossless
image transformation is only possible with images 'born digital',
where the full content, including annotations and metadata, of the
original image is preserved and can be exploited to create an
exact copy of the original.<br>
<br>
Terry<br>
<br>
On 11/20/2016 2:19 AM, John Garrett wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">Sorry. Forgot
to say that one to one mapping being discussed is between
the entities in the new representation and the equivalent
entities in the original representation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">For example,
the ‘A’ character in Unicode has a one to one mapping back
to the ‘A’ character in ASCII.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Wishing you
prosperity and peace,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-JOhn <o:p></o:p></span></p>
<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> John Garrett
[<a class="moz-txt-link-freetext" href="mailto:garrett@his.com">mailto:garrett@his.com</a>] <br>
<b>Sent:</b> Sunday, November 20, 2016 2:15 AM<br>
<b>To:</b> 'MOIMS-Data Archive Ingestion'
<a class="moz-txt-link-rfc2396E" href="mailto:moims-dai@mailman.ccsds.org"><moims-dai@mailman.ccsds.org></a><br>
<b>Subject:</b> RE: [Moims-dai] Question about Reversible
Transformation<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I think the
explanation of Reversible Transformation with examples later
in the document is helpful in understanding what is meant.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">It might help
to replace ‘entity’ with ‘component’ or ‘item’ or ‘thing’ or
‘object’.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">For version 3
that we are working on now. I think I might drop the second
‘resulting’ and ‘base’ in an updated definition. Would that
change anyone’s understanding the term?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Wishing you
prosperity and peace,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-JOhn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> MOIMS-DAI [<a
moz-do-not-send="true"
href="mailto:moims-dai-bounces@mailman.ccsds.org"><a class="moz-txt-link-freetext" href="mailto:moims-dai-bounces@mailman.ccsds.org">mailto:moims-dai-bounces@mailman.ccsds.org</a></a>]
<b>On Behalf Of </b>Caillet Claire<br>
<b>Sent:</b> Thursday, November 17, 2016 4:17 AM<br>
<b>To:</b> MOIMS-Data Archive Ingestion <<a
moz-do-not-send="true"
href="mailto:moims-dai@mailman.ccsds.org"><a class="moz-txt-link-abbreviated" href="mailto:moims-dai@mailman.ccsds.org">moims-dai@mailman.ccsds.org</a></a>><br>
<b>Subject:</b> [Moims-dai] Question about Reversible
Transformation<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Once again, in the translation work of the
OAIS, we have some questions. It is about the definition of
the <b>Reversible Transformation</b> (A Transformation in
which the new representation defines a set (or a subset) of
resulting entities that are equivalent to the resulting
entities defined by the original representation. This means
that there is a one-to-one mapping back to the original
representation and its set of base entities.).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What is meant by “resulting entities” and
“base entities” ? Is the one-to-one mapping between the
original representation and its base entities or between the
new and the original representation base entities ?<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="color:black;mso-fareast-language:FR"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR">Thanks
for you help.<o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:6.0pt"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">_______________________________________________________________________</span><span
style="mso-fareast-language:FR" lang="FR"><o:p></o:p></span></p>
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src="cid:part4.07030102.09020500@comcast.net"
v:shapes="Image_x0020_1" align="left" height="46"
hspace="12" width="42"><!--[endif]--><b><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:FR"
lang="FR">Claire Caillet<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;mso-fareast-language:FR"
lang="FR">CNES</span></b><span
style="font-size:8.0pt;mso-fareast-language:FR" lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">DCT/PS/TVI</span><span
style="mso-fareast-language:FR" lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR"> </span><span style="mso-fareast-language:FR"
lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">Centre Spatial de Toulouse</span><span
style="mso-fareast-language:FR" lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">Tel.: +33 5 61 28 14 38<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="IT">e-mail : <a moz-do-not-send="true"
href="mailto:claire.caillet@cnes.fr">claire.caillet@cnes.fr</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="IT"> </span><span style="mso-fareast-language:FR"
lang="IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">18 Avenue Edouard Belin </span><span
style="mso-fareast-language:FR" lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">31 401 Toulouse Cedex 4<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">FRANCE<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:FR"
lang="FR">_______________________________________________________________________</span><span
style="mso-fareast-language:FR" lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
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