Photorefractive crystals for real-time image processing

Ken-Yuh 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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1 Scopus citations


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: LiNbO 3 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.

Original languageEnglish
Article number102700D
Pages (from-to)204-220
Number of pages17
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 11 Jul 1993
EventPhotorefractive Materials, Effects, and Applications: A Critical Review 1993 - San Diego, United States
Duration: 11 Jul 199316 Jul 1993


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