Teiji Okamoto

A compacting technologies for small size personal facsimile

A small sized facsimile machine with a high picture quality and with good gray-level image processing capabilities was developed. This facsimile machine contains a compact mechanism with one major and two rollers, and a single chip system control LSI including 2-kB memory. A compact mechanism with one motor and two rollers tends to cause faulty compensation of shading distortion. A new method was developed for shading compensation to solve this problem. >

Still video transceiver over the general telephone networks

A description is given of a still video transceiver that transmits full-colour still pictures to anywhere in the world over the general world-wide telephone networks. The system uses highly efficient picture coding that compresses picture data to about 3 bit/pixel with little degradation of quality. This accomplished by the combination of discrete cosine transform (DCT) and entropy coding. Highly reliable transmission under bad telephone-line conditions is realized by the combination of retransmission and fallback techniques. Experimental results of the data compression and transmission of a standard picture by the still video transceiver system are shown. >