Seal imprint recognition with joint transform correlators

Chulung Chen; Jian-Shuen Fang

doi:10.1117/12.403850

10 October 2000 Seal imprint recognition with joint transform correlators

Chulung Chen, Jian-Shuen Fang

Proceedings Volume 4222, Process Control and Inspection for Industry; (2000) https://doi.org/10.1117/12.403850
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China

Abstract

In many commercial applications in Chinese society, seals instead of signatures for person identification are widely used, such as money withdrawing lists, checks, receipts, etc. It needs high rate of correctness. However, it can not be effective if the process of safety validation is inspected merely by human eyes. Also, for safe control and management, in addition to the potential human cheating act, there is also a possible error due to human neglect. Based on the constrained energy minimization joint transform correlator (CEMJTC), we have proposed a prototype Chinese seal recognition system, which combines the advantage of light speed and programmability of computer. The CEM filter designed for optical correlator has the desirable property of sharp peak with low sidelobes levels in the output correlation plane. Th major advantages of the system are alignment simplicity, rotation invariant capability, high discrimination capability and suitability for hybrid optical signal processing.

Citation Download Citation

Chulung Chen and Jian-Shuen Fang "Seal imprint recognition with joint transform correlators", Proc. SPIE 4222, Process Control and Inspection for Industry, (10 October 2000); https://doi.org/10.1117/12.403850

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KEYWORDS

Optical correlators

Joint transforms

Filtering (signal processing)

Fourier transforms

Spatial light modulators

Optical filters

Optical pattern recognition

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