Chen YS, Zheng SH, Li DH. Effective hybrid processor to compute image moments for pattern recognition.
OPTICS LETTERS 1991;
16:654-656. [PMID:
19774028 DOI:
10.1364/ol.16.000654]
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Abstract
A hybrid optical-digital processor is presented for computing the invariant moments of images in real time, which consists of a holographic mask, two lenses, a charge-coupled-device detector, and a microcomputer. The processor is tested by inputting some roman letters, and the produced results show that the invariant moments of a letter are approximately independent of shift and rotation and that the moments are distinct with different letters.
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