000
| 02937cam 2200409zi 4500 |
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001 | 9.891736 |
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003 | CaOODSP |
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005 | 20221107172952 |
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006 | m o d f |
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007 | cr mn||||||||| |
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008 | 200923s1979 onca o f000 0 eng d |
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040 | |aCaOODSP|beng|erda|cCaOODSP |
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043 | |an-cn--- |
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086 | 1 |aCo24-3/8-699-1979E-PDF |
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100 | 1 |aBown, H. G., |eauthor. |
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245 | 10|aPicture description instructions, PDI, for the Telidon videotex system / |cby H.G. Bown, C.D. O'Brien, W. Sawchuk and J.R. Storey. |
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264 | 1|aOttawa : |bCommunications Research Centre, |c1979. |
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300 | |a1 online resource (iii, 71 pages) : |billustrations. |
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336 | |atext|btxt|2rdacontent |
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337 | |acomputer|bc|2rdamedia |
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338 | |aonline resource|bcr|2rdacarrier |
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490 | 1 |aCRC technical note ; |vno. 699-E |
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500 | |aIssued also in French under title: Instructions de description de l'image, IDI, pour le système vidéotex Télidon. |
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500 | |a"Technology and Systems Branch." |
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500 | |a"November 1979." |
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500 | |aDigitized edition from print [produced by Innovation, Science and Economic Development Canada]. |
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500 | |aSome pages rotated in this copy. |
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520 | 3 |a"The Telidon Videotex system is a method by which information can be accessed from central data bases by the general public. By the use of a domestic home television receiver augmented by a micro-computer controlled interface device a user can access pages of graphical and textual information over a public common carrier communications facility such as the telephone network, a cable television line or the data may be even encoded into unused space in a broadcast television signal. In order to transmit information to a Telidon terminal, at minimum bandwidth, and in a manner independent of the type of communications channel, a coding scheme was devised which encodes 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, point by point BIT encoded images and TEXT encoded as ASCII characters. This document provides a detailed specification of this code as well as a description of the principles which make it independent of communications channel and display hardware"--Abstract, page 1. |
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530 | |aIssued also in print format. |
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650 | 5|aTelidon (Data transmission system) |
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650 | 0|aVideotex systems|zCanada. |
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650 | 0|aImage transmission. |
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710 | 2 |aCommunications Research Centre (Canada), |eissuing body. |
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775 | 08|tInstructions de description de l'image, IDI, pour le système vidéotex Télidon / |w(CaOODSP)9.891737 |
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830 | #0|aCRC technical note ;|vno. 699-E.|w(CaOODSP)9.882494 |
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856 | 40|qPDF|s1.69 MB|uhttps://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-8-699-1979-eng.pdf |
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