Real-time optical implementation of difference-of-Gaussians wavelets

Ting-Chung Poon; Kwongchoi Caisy Ho

doi:10.1117/12.170060

15 March 1994 Real-time optical implementation of difference-of-Gaussians wavelets

Ting-Chung Poon, Kwongchoi Caisy Ho

Proceedings Volume 2242, Wavelet Applications; (1994) https://doi.org/10.1117/12.170060
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

We propose a hybrid optical/electronic image processing system for the real-time implementation of a wavelet transform. Specifically, the difference-of-Gaussians (DOG) wavelet is synthesized in the hybrid system and used to process an input object. In the implementation, two laser beams with different temporal frequencies are first generated by an acousto-optic modulator. The two optical beams are then combined spatially and used to scan and process the object. The scattered light from the object is then picked up by a photodetector. The photodetector's electrical output signal, after appropriate electronic filtering, represents a scanned and processed version of the original object and can be sent to a monitor for real-time display or to a digital storage device for possible further processing. Because the hybrid system is based on optical scanning, it is an incoherent system and hence has a much better signal-to-noise ratio (SNR) as compared to its coherent counterpart. Experimental results are presented and shown to be in excellent agreement with computer simulations.

Citation Download Citation

Ting-Chung Poon and Kwongchoi Caisy Ho "Real-time optical implementation of difference-of-Gaussians wavelets", Proc. SPIE 2242, Wavelet Applications, (15 March 1994); https://doi.org/10.1117/12.170060

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KEYWORDS

Wavelets

Spatial light modulators

Wavelet transforms

Photodetectors

Computer simulations

Optical scanning systems

Signal processing

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