Image analysis – Image compression or coding – Transform coding
Patent
1995-07-06
1998-04-14
Boudreau, Leo
Image analysis
Image compression or coding
Transform coding
382251, G06K 900
Patent
active
057402833
ABSTRACT:
Interframe compression of moving image data is achieved by a combination of vector coding and scalar coding of transform coefficient differences formed by the subtraction of previous image transform coefficients from corresponding present image transform coefficients along a Zig-Zag path in the arrays of coefficients. More efficient scalar codes are used instead of vector codes for transmission of coefficient data where the previous image coefficients are non-zero along the path. Vector codes are used where a non-zero value in the previous image transform array has not been established but a non-zero value coefficient occurs in the present image transform array. Vector coding efficiency is improved by modified run length coding.
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Recommendation, H.261--Video codec for audiovisual services at p x 64 kbit/s, CCITT Study Group XV, Geneva Meeting, Jul. 16-27, 1990, pp. 79-108, Report R37, Recomendations of the H-Series, Period 1989-1992, Com XV-R 37-E, Aug. 1990.
Boudreau Leo
Feeney William L.
Rubin, Bednarek & Associates, Inc.
Tadayan B.
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