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    REDUNDANT AREA CODING SYSTEM (REARCS)

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    ITC_1972_72-11-1.pdf
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    Author
    Maier, James L.
    Gardenhire, Lawrence
    Affiliation
    Rome Air Development Center
    Harris Intertype Corporation
    Issue Date
    1972-10
    
    Metadata
    Show full item record
    Rights
    Copyright © International Foundation for Telemetering
    Collection Information
    Proceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
    Publisher
    International Foundation for Telemetering
    Journal
    International Telemetering Conference Proceedings
    Abstract
    Redundant area coding was proposed in an Air Force patent, James Maier inventor, to relieve the long integration time required to transmit a reconnaissance photograph through narrow-band communication circuits where upper limits of 4800 to 9600 bits/second prevail. Further development by Radiation Systems Division was funded by Rome Air Development Center’s Reconnaissance and Intelligence Division. Mr. Lawrence Gardenhire developed the analysis curves used. As redundant area coding was conceived, unimportant areas were reduced by applying different orders of resolution throughout one frame of imagery, by blanking redundant areas, or by applying encoding so one frame could consist of areas basically unchanged and areas coded to represent special land such as Forest or desert. What evolved were techniques of applying redundant reduction algorithms in both areas, producing a low/ high resolution picture. Where 3 to 1 reduction ratios were optimum for an average “busy” picture, reduction ratios exceeding 10 to I have been realized. A 9 x 9 inch, 2000 x 2000, 6-bit grey level picture that required 42 minutes to send at a 9600-bit/ second rate, or about 14 minutes for a 3 to 1 reduction, can now be sent in 5 to 6 minutes. A 10 to 1 reduction ratio makes transmitting imagery through existing ground circuits more of a reality and fulfills user requirements.
    Sponsors
    International Foundation for Telemetering
    ISSN
    0884-5123
    0074-9079
    Additional Links
    http://www.telemetry.org/
    Collections
    International Telemetering Conference Proceedings, Volume 08 (1972)

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