12 January 1993 Tracking speckle patterns with optical correlation
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It has been shown that tracking small particle motion can be accomplished by tracking the speckle pattern is produces. This paper describes various methods of real-time tracking of speckle patterns obtained from ultrasonic flow imaging of blood and tissue motion using optical correlation. Results obtained from a gray scale joint transform correlator utilizing a twisted nematic liquid crystal spatial light modulator and from Sandia Lab's acousto-optical correlator are presented. The experimental results demonstrate the feasibility of real-time tracking with accuracy comparable to that of template matching algorithms currently being implemented in digital hardware.
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Natalie Clark, Michael K. Giles, Sarah H. Harrison, Chris P. Hofer, "Tracking speckle patterns with optical correlation", Proc. SPIE 1772, Optical Information Processing Systems and Architectures IV, (12 January 1993); doi: 10.1117/12.140898; https://doi.org/10.1117/12.140898

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