LIBGPIV is software for (Digital) Particle Image Velocimetry (PIV). It contains the core functions for image-processing, image evaluation, validation, post-processing, input/output functions, memory allocation etc.-LIBGPIV is software for (Digital) Particl e Image Velocimetry (PIV). It contains the core functions for image-processing. image evaluation, validation, post-processing, input / output functions. memory allocation etc..