[OPTICAL REVIEW Vol. 5, No. 3 (1998) 152-157]

Image Compression Using an Improved Optical Inner Product Processor

Takeshi HASHIMOTO, Ikutoshi FUKUSHIMA, Mitsuru NAMIKI and Kimiaki YAMAMOTO

Research Group 4, Advanced Technology Research Center, Olympus Optical Co., Ltd., 2-3, Kuboyama-cho, Hachioji, Tokyo, 192-8512 Japan

(Received March 4, 1998; Accepted April 14, 1998)

We show a prototype of a coding system for image compression using vector quantization with an optical inner product processor, whose accuracy is improved by the applying data transformation method. We also present compression effects for gray-scaled images by this system. The system can compress 256×56× bits image data within 1.2 seconds under 0.18 compression ratio with an adequate quality.

Key words : optical analog processing, inner product processing, image encoding, image compression, vector quantization