Abstract
A new algorithm has been developed which enables automatic 2D-velocity measurement within a very short time. The algorithm consists of a high speed calculation of cross-correlation between two pictures, and new methods of removing erroneous vectors.The method is examined to measure a rotation of a turn table, a natural convection in a tank and a sudden expansion flow in a channel. The typical analysis time which depends on analysis conditions and pictures, is 2-4 seconds to obtain 100 vectors from a couple of 200×240 bi-levelyzed pictures.The programs coded in C runs on a simple 16bit peraonal computer system with a image capture board.
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