<div><div dir="auto">I cannot remember whether they chose square or rectangular pixels for high definition TV.</div><div dir="auto"><br></div><div dir="auto">I think that rectangular might be preferable, or it might sow confusion where people are asking for the aspect ratio of a pixel.</div><div dir="auto"><br></div><div dir="auto">John</div></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 21, 2020 at 2:16 PM Don Brutzman <<a href="mailto:brutzman@nps.edu">brutzman@nps.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">Thanks Dick. Please share SOED definition of voxel (and url if available) so that we can see if everyone agrees the definition is clear.<br>
<br>
I was in a geospatial meeting earlier today where they announced they were working on a definition for voxel. Will compare when that emerges.<br>
<br>
Point of comparison follows from wiktionary:<br>
<br>
[1] wiktionary: voxel<br>
<a href="https://en.wiktionary.org/wiki/voxel" rel="noreferrer" target="_blank">https://en.wiktionary.org/wiki/voxel</a><br>
<br>
"(computer graphics) the three-dimensional analogue of a pixel; a volume element representing some numerical quantity, such as the colour, of a point in three-dimensional space, used in the visualisation and analysis of three-dimensional (especially scientific and medical) data"<br>
<br>
On 7/21/2020 10:40 AM, Richard F. Puk wrote:<br>
> <br>
> Hi, Don --<br>
> <br>
> Both pixel and voxel are defined in the SOED. However, the definition of pixel is problematical while the definition of voxel is clear and is as intended in the spec. Therefore, the term pixel does need a definition while the definition of voxel is as defined in the SOED and therefore does not need a definition.<br>
<br>
meanwhile, unchanged:<br>
<br>
[2] Extensible 3D (X3D) Part 1: Architecture and base components<br>
clause 3 Terms, definitions, acronyms, and abbreviations, 3.1.53 pixel<br>
<a href="https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/glossary.html#Pixel" rel="noreferrer" target="_blank">https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/glossary.html#Pixel</a><br>
<br>
"one element of an image specified as a matrix of colour elements"<br>
<br>
TODO: we should add lower-case bookmarks as well.<br>
<br>
[3] wiktionary, pixel<br>
<a href="https://en.wiktionary.org/wiki/pixel#English" rel="noreferrer" target="_blank">https://en.wiktionary.org/wiki/pixel#English</a><br>
<br>
1. One of the tiny dots that make up the representation of an image in a computer's memory.<br>
2. One of the squares that make up a pixel art work or a zoomed in image in a computer.<br>
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all the best, Don<br>
-- <br>
Don Brutzman Naval Postgraduate School, Code USW/Br <a href="mailto:brutzman@nps.edu" target="_blank">brutzman@nps.edu</a><br>
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149<br>
X3D graphics, virtual worlds, navy robotics <a href="http://faculty.nps.edu/brutzman" rel="noreferrer" target="_blank">http://faculty.nps.edu/brutzman</a><br>
<br>
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</blockquote></div></div>