A hardware motion compensator for a videoconferencing codec

Author

Parke, I.

Author_Institution

Visual Telecommun. Div., British Telecom Res. Lab., Ipswich, UK

fYear

1990

fDate

33154

Firstpage

42522

Lastpage

42526

Abstract

In December 1984 a CCITT specialists group was formed to standardise video coding at rates between 384 and 2048 kbit/s for video telephony. After much computer simulation work in many countries a combination of interframe prediction and hybrid transform coding was chosen for further investigation with real-time hardware. Several organisations in Europe, Japan and the USA began construction of flexible test-beds to permit verification, optimisation and enhancement of the algorithm. The algorithm performed well and it was decided to extend the range of bit rates down to 64 kbit/s. An outline diagram of the encoder is shown. International tests of this revised algorithm took place towards the end of 1989. The countries involved were Germany, Japan, UK and USA. The recommendation is known as H.261

Keywords

codecs; computerised picture processing; encoding; teleconferencing; videotelephony; 384 to 2048 kbit/s; 64 kbit/s; CCIT recommendation H.261; Europe; Germany; Japan; UK; USA; algorithm; computer simulation; encoder; hardware motion compensator; hybrid transform coding; interframe prediction; test-beds; video coding; video telephony; videoconferencing codec;

fLanguage

English

Publisher

iet

Conference_Titel

Applications of Motion Compensation, IEE Colloquium on

Conference_Location

London

Type

conf

Filename

190610