Television – Bandwidth reduction system – Data rate reduction
Patent
1997-11-12
1999-12-28
Britton, Howard
Television
Bandwidth reduction system
Data rate reduction
348390, 348845, H04N 726
Patent
active
060088532
ABSTRACT:
This invention is a method of decoding a stream of video image data transmitted as independent image frames consisting of plural marcoblocks transmitted in a nonsequential order. The method defines a sub-frame corresponding to a proper subset of the full frame. The method determines if a currently received macroblock is within the sub-frame. The method decodes the sub-frame. The sub-frame may be decoded at less than or equal to the frame rate of the video image data. A table has one entry for each macroblock that stores a transmission order within the video frame for the corresponding macroblock. The method determine if a current macroblock is within the sub-frame by reading the table. Each macroblock consists of a plurality of contiguous blocks and includes luminance data for any included blocks and chrominance data for the macroblock as a whole. The method optionally decodes the luminance data for each included block and ignores the chrominance data. The method decodes the sub-frame employing only data prior to an end of data marker or the end of a data group allocated to that block, and ignores data following an end of data marker. The method may also decode a full frame of video image data at a full frame decode rate less than the sub-frame decode rate. The method preferably employs a digital camcorder to generate the stream of video image data and a notebook computer for decoding and display.
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patent: 4222076 (1980-09-01), Knowlton
patent: 5150432 (1992-09-01), Ueno
patent: 5508743 (1996-04-01), Iizuka
patent: 5614952 (1997-03-01), Boyce
patent: 5907361 (1999-05-01), Okada
patent: 5930526 (1999-07-01), Iverson
patent: 5951140 (1990-08-01), Ueno
Aggarwal Manoj
Flinchbaugh Bruce E.
Narayan Ajai
Britton Howard
Donaldson Richard L.
Laws Gerald E.
Marshall, Jr. Robert D.
Texas Instruments Incorporated
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