Interframe tri‐level differential coding technique on narrow band transmission for video conference system
Hideyoshi Tominaga, Shohei Takeuchi, Hiroaki Kondo · Systems and Computers in Japan · 1986
Abstract This paper describes the “Interframe Tri‐Level Differential Coding Technique,” where two thresholds are prepared for interframe pixels. A differential trinary plane is constructed, and the information volume is suppressed by transmitting its boundary line information. The proposed coding technique incorporates a dynamic threshold setting algorithm and a coding algorithm for expressing the boundary line of the differential trinary plane by a tree structure. The simulation results are shown. Since this coding method smoothes the source information in capacity‐limited narrow‐band transmission line, its resolution worsens when the image is moving. However, accurate images soon are obtained when a still image is input. This method is suitable for a TV‐conference and a TV‐lecture integrated in the telematique service of 64 × N Kbps ISDN.