05991447 is referenced by 258 patents and cites 10 patents.

A system for coding of digital video images such as bi-directionally predicted video object planes (B-VOPs), in particular, where the B-VOP and/or a reference image used to code the B-VOP is interlaced coded. For a B-VOP macroblock which is co-sited with a field predicted macroblock of a future anchor picture, direct mode prediction is made by calculating four field motion vectors, then generating the prediction macroblock. The four field motion vectors and their reference fields are determined from (1) an offset term of the current macroblock's coding vector, (2) the two future anchor picture field motion vectors, (3) the reference field used by the two field motion vectors of the co-sited future anchor macroblock, and (4) the temporal spacing, in field periods, between the current B-VOP fields and the anchor fields. Additionally, a coding mode decision process for the current MB selects a forward, backward, or average field coding mode according to a minimum sum of absolute differences (SAD) error which is obtained over the top and bottom fields of the current MB.

Title
Prediction and coding of bi-directionally predicted video object planes for interlaced digital video
Application Number
8/944118
Publication Number
5991447
Application Date
October 6, 1997
Publication Date
November 23, 1999
Inventor
Ajay Luthra
San Diego
CA, US
Xuemin Chen
San Diego
CA, US
Robert O Eifrig
San Diego
CA, US
Agent
Ralph F Hoppin
Barry R Lipsitz
Assignee
General Instrument Corporation
PA, US
IPC
G06K 9/00
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