CIV project

CIVx (Correlation Imaging Velocimetry) is a free advanced Imaging Velocimetry implementation of Direct-Cross Correlation PIV that relies on generalized pattern matching by direct cross-correlation of pattern boxes between image pairs.

CIVx Key Features

Spatial decoupling of the pattern box in image a from its counterpart in image b

Arbitrary grid definition by user or mesh generator

Advanced mask implementations

Correlation multiplication to reduce spurious vectors

Iterative CIV, taking into account pattern deformation by strain and rotation

Adaptative continuous window shifting to reduce peak-locking effect

Image distortion

Numerical computation can be used as first guess

Standard file format for easy integration with third party solutions

User defined criterions for false vector removal

Graphical interface for automatic distribution of large number of jobs over a network of workstations.

CIVx is portable to most computer architecture and operating systems, including standard solution for windows and linux OS, stand-alone, server, cluster computers.

References:

CIVx system is used at the CORIOLIS turntable in Grenoble, France. As an European Research Infrastructure, several european teams use the PIV system for measurements in the rotating tank.
List of European teams invited since 2000 and projects

Olivier Praud Thesis

Emmanuelle Thivolle-Cazat thesis part 1

Emmanuelle Thivolle-Cazat thesis part 2

Bibliography and Papers
Fincham, A., and G. Spedding, 1997, Low cost, high resolution DPIV for measurement of turbulent fluid flow. Exp. Fluids, 23, 449-462 defined the CIV techniques and several acquisition optimizations.

Fincham A. and Delerce G. (2000) , Advanced optimization of correlation imaging velocimetry algorithms, Experiments in Fluids 29, S13-S22. describe the latest improvements around a hierarchical scheme and images spatial transformations.