<正> Sinee nineteen seventies

image processing teehniques has been widely applieated

the researcbof image transmission using digital techniques is greatly speeded up

and a new reseatrch direqtionof cornputer visiOil is in big progress. It would have great influeces on the developments oftelecommunicatioil theotries and techniques. Due to such a situatiOil

the Jourinal of ChinaInstitute of Commuilications decided in December 1984 to publish a Special Issue on Image