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11 October 2010 Displacement measurement using phase joint transform correlators
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Since joint transform correlators based on amplitude light modulator have poor light efficiency and low cross-correlation peak, a displacement measurement method based on spatial light modulator is proposed. After the input images were coded by phase spatial light modulator, corresponding displacement between the adjacent two pictures could be detected through the joint transform correlator. Experiments were carried out with under-exposed images. The experimental results showed that phase joint transform correlators had better discrimination. The proposed technique is very effective for motion detection under circumstances of low illumination.
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Peng Ge, Qi Li, Hua-jun Feng, and Zhi-hai Xu "Displacement measurement using phase joint transform correlators", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76562G (11 October 2010);

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