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Initial algorithm research
Some basic background research and a LabVIEW algorithm from another student project: http://math.arizona.edu/~ura-reports/022/Crites.Andrew/piv_report.htm
The standard Matlab toolbox is MatPIV. It no longer seems to exist at its listed home: MatPIV 1.6.1, but I've included a copy from my RoboClam work in the thirdParty folder.
Here's another Matlab implementation: PIVlab: http://pivlab.blogspot.com/. It looks like it might be slightly friendlier, and appears to include tools for generating synthetic images for testing.
Another Matlab toolbox for PIV: http://www.oceanwave.jp/softwares/mpiv/. This one seems to have more documentation than PIVlab.
This is the manual for a standalone tool to generate synthetic images for testing, but it (annoyingly) doesn't include the actual code: http://www.meol.cnrs.fr/LML/EuroPIV2/SIG/doc/SIG_Main.htm
"piv-online" has a wiki with some (mostly dead) links to test sets: http://piv-online.org/wiki/index.php?title=Test_cases
The "pivchallenge" site has some reference images: http://www.pivchallenge.org/
It looks like Matlab support fixed-point arithmetic well: http://www.mathworks.com/help/fixedpoint/gs/use-fixed-point-arithmetic.html