TELIDON VIDEOTEX PRESENTATION LEVEL PROTOCOL: AUGMENTED PICTURE DESCRIPTION INSTRUCTIONS

Authors
  1. O'Brien, C.D.
  2. Bown, H.G.
  3. Smirle, J.C.
  4. and others
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN)
Abstract
The Telidon Videotex system is a method by which information and transactional services can be accessed from information sources by the general public. By the use of a domestic home television receiver typically augmented by a micro-computer controlled interface device, a user can access pages of graphical and textual information over public common carrier communications facilities including the telephone network, a cable television line or encoded into unused space in a broadcast television signal. In order to transmit information to a Telidon terminal at a minimum bandwidth, and in a manner independent of the type of communications channel, a coding scheme has been devised which permits the encoding of a picture into the geometric drawing elements which compose it. These "Picture Description Instructions" are an alpha-geometric coding model and are based on the primitives of POINT, LINE, ARC, RECTANGLE, POLYGON and INCREMENT. TRUNCATED
Report Number
TN-709-E —
Date of publication
15 Feb 1982
Number of Pages
182
DSTKIM No
82-02624
CANDIS No
37003
Format(s):
Hardcopy;Originator's fiche received by DSIS

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