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Rev

$\begingroup$ Thanks! A quick check of references in your first link (Wikipedia's AR Tag) shows that with all the error correction and removal of eight-fold ambiguity (rotation/mirror) those 36 bits only encode a number between 0 and 2047 if I understand correctly, but I'm not sure if reversing image value (positive/negative, light/dark) is used to get the top 1024 values or not. $\endgroup$
– uhoh
Commented Sep 22, 2019 at 23:08
$\begingroup$ @uhoh - it is definitely not a QR code $\endgroup$
– Rory Alsop ♦
Commented Sep 23, 2019 at 4:24

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