Title :
Videophone with DPCM mode
Author :
Zhang, Jia-Mou ; Zhou, Ji-Xin
Author_Institution :
Beijing Univ. of Posts & Telecommun., China
Abstract :
Several high compression rate coding techniques are discussed which are meant to reduce the transmission bit-rate of moving pictures of a videophone to that of a digital baseband of 64 kbps. An experimental system based on a digital pulse code modulation (DPCM) system gave acceptable picture quality at 144 kbps for scenes with moderate motion. The improvement of the system to compress moving images to give a lower bit-rate of 64 kbps is discussed. The main goal is to find a coding method that gives a high compression ratio with low hardware complexity
Keywords :
data compression; encoding; picture processing; pulse-code modulation; videotelephony; 144 kbit/s; 64 kbit/s; DPCM; bit rate reduction; digital baseband; digital pulse code modulation; high compression rate coding; high compression ratio; moving pictures; picture compression; picture quality; transmission bit-rate; videophone; Baseband; Block codes; Computer simulation; Costs; Digital video broadcasting; Discrete cosine transforms; Hardware; ISDN; Telecommunications; Vector quantization;
Conference_Titel :
Computer and Communication Systems, 1990. IEEE TENCON'90., 1990 IEEE Region 10 Conference on
Print_ISBN :
0-87942-556-3
DOI :
10.1109/TENCON.1990.152672
