several features which make it a good choice for this purpose:
* It is fast enough to be used with realtime video: extracting and decoding
from VGA frame takes about 50 ms on a modern x86 core.
* It has a robust and tolerant recognition algorithm. It can correctly
recognise and decode QR codes which are rotated and/or oblique to the
camera. It can also distinguish and decode multiple codes within the same
image.
* It is easy to use, with a simple API described in a single commented header
file (see below for an overview).
* It is small and easily embeddable, with no dependencies other than standard
C functions.
* It has a very small memory footprint: one byte per image pixel, plus a few
kB per decoder object.
* It uses no global mutable state, and is safe to use in a multithreaded
application.
* BSD-licensed, with almost no restrictions regarding use and/or modification.
OK sthen@
