OSIV is a program written to perform cross-correlation analysis of particle image velocimetry (PIV) images. The program was designed to be both very modular and quite efficient. It incorporates most of the tried-and-true algorithms and some of the more recent additions to the PIV toolkit. Importantly, OSIV is released open source so that users may contribute back to the project.

The program is available for download in several forms. The command-line version of the program may be downloaded either as pre-built binary packages or as source code. A Matlab toolbox is also available and may be used with Windows, Mac OS X, or Linux platforms. While the command line version offers some functionality not available in the Matlab toolbox, the Matlab interface is frequently preferred by Windows and Mac OS X users.