Cross-correlation and cross-tracking of compressed digital PIV images

Callum Gray

doi:10.1117/12.293389

21 November 1997 Cross-correlation and cross-tracking of compressed digital PIV images

Callum Gray

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.293389
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

One of the major technological difficulties in implementing digital particle image velocimetry (PIV) is associated with acquiring, processing and storing large volumes of image data form high resolution CCD camera(s). Current CCD camera technology provides both very high resolutions and high frame rates typically producing tens of megabytes of data per second. With the need for simultaneous data form two or more image sources the problems of data transmission, processing and storage become extreme. Significant increases in transfer, processing and storage can be achieved by compressing images by removing components of the image that are redundant or of low significance. This paper presents an approach to PIV image compression and methods of processing encoded data. The effect of varying levels of compression on data transfer and processing rates as well as measurements precision is considered and illustrated with results from both real and synthetic image data.

Citation Download Citation

Callum Gray "Cross-correlation and cross-tracking of compressed digital PIV images", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.293389

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