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Proceedings Paper

Photorefractive crystals for real-time image processing
Author(s): Ken Y. Hsu; Shiuan-Huei Lin; Tai Chiung Hsieh; LongJang Hu; T. S. Yeh; H. P. Lin; Chia-Hui Lin; S. L. Tu; Sheng-Jehn Yang; Shu-En Hsu
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Paper Abstract

Heavily iron doped lithium niobate photorefractive crystals are grown and characterized. The crystals have high diffraction efficiency and fast temporal response and hence are suitable for real-time image processing. Three applications of thin Fe: LiNb03 plates are demonstrated: the joint-transform correlator, the optical perception, and the hybrid image classifier. In the first and third systems, the heavily doped (0.5% mole) crystals are used. These crystals have fast temporal response (300-400 msec) and thus provide a means for real time optical processing. In the second system, a slightly light doped (0.1% mole) crystal is used. It has relatively long (> 1 minute) response time and is used for recording the dynamic memory in a neural network. Image recognition by these three systems are presented.

Paper Details

Date Published: 28 April 1994
PDF: 17 pages
Proc. SPIE 10270, Photorefractive Materials, Effects, and Applications: A Critical Review, 102700D (28 April 1994); doi: 10.1117/12.178619
Show Author Affiliations
Ken Y. Hsu, National Chiao Tung Univ. (Taiwan)
Shiuan-Huei Lin, National Chiao Tung Univ. (Taiwan)
Tai Chiung Hsieh, National Chiao Tung Univ. (Taiwan)
LongJang Hu, Chung Shan Institute of Science and Technology (Taiwan)
T. S. Yeh, Chung Shan Institute of Science and Technology (Taiwan)
H. P. Lin, Chung Shan Institute of Science and Technology (Taiwan)
Chia-Hui Lin, Chung Shan Institute of Science and Technology (Taiwan)
S. L. Tu, Chung Shan Institute of Science and Technology (Taiwan)
Sheng-Jehn Yang, Chung Shan Institute of Science and Technology (Taiwan)
Shu-En Hsu, Chung Shan Institute of Science and Technology (Taiwan)


Published in SPIE Proceedings Vol. 10270:
Photorefractive Materials, Effects, and Applications: A Critical Review
Pochi Yeh; Claire Gu, Editor(s)

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