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29 November 2000 Particle velocity computation using a phase-only filter
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This paper introduces two new concepts into the field of particle image velocimetry. Traditionally, a particle image velocimeter is based on correlation operation between multiply exposed images. Cross-correlation operation is same as classical matched filtering (CMF) operation, which suffers from low peak intensity and power efficiency. Phase only filter (POF), because of its power efficiency and sharp correlation peak has been used extensively for pattern recognition. We propose to introduce POF instead of CMF for tracking high-speed particles. In addition, a powerful approach for particle tracking is introduced which involves tracking the particle in nine-directions. To track displacement of particles further away from original location, the original image is correlated with eight blocks around the original block. This enable us to track higher velocity particles. The method involves correlating two pictures taken some time apart. Phase only filter is used to correlate the original image with its time and space- shifted version to determine the velocity of the particles.
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Abdul Ahad Sami Awwal, Syed M. Munir, and Mohammad Kamrul Islam "Particle velocity computation using a phase-only filter", Proc. SPIE 4114, Photonic Devices and Algorithms for Computing II, (29 November 2000);

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