Advanced bi-directional predictive coding of interlaced video

Abstract

For interlaced B-fields or interlaced B-frames, forward motion vectors are predicted by an encoder / decoder using forward motion vectors from a forward motion vector buffer, and backward motion vectors are predicted using backward motion vectors from a backward motion vector buffer. The resulting motion vectors are added to the corresponding buffer. Holes in motion vector buffers can be filled in with estimated motion vector values. An encoder / decoder switches prediction modes between fields in a field-coded macroblock of an interlaced B-frame. For interlaced B-frames and interlaced B-fields, an encoder / decoder computes direct mode motion vectors. For interlaced B-fields or interlaced B-frames, an encoder / decoder uses 4 MV coding. An encoder / decoder uses 'self-referencing' B-frames. An encoder sends binary information indicating whether a prediction mode is forward or not-forward for one or more macroblocks in an interlaced B-field. An encoder / decoder uses intra-coded B-fields [BI-fields'].

Description

[0001] related application [0002] This application claims benefit to U.S. Provisional Patent Application No. 60 / 501,081, entitled "Video Encoding and Decoding Tools and Techniques," filed September 7, 2003, which is incorporated by reference combined here. [0003] The following co-pending U.S. patent applications are related to this application and are hereby incorporated by reference: 1) Serial No. 10 / 622,378 entitled "Advanced Bi-Directional Predictive Coding of Video Frames" and published at U.S. Patent Application filed July 18, 2003; 2) Serial No. 10 / 622,284 entitled "Intraframe and Interframe Interlace Coding and Decoding" and filed July 18, 2003 3) U.S. Patent Application Serial No. 10 / 622,841 entitled "Coding of Motion Vector Information" (Coding of Motion Vector Information) and filed on July 18, 2003; 4) Serial No. 10 / 857,473 US patent application entitled "Predicting Motion Vectors for Fields of Forward-predicted Interlaced Video Frames" and filed May 27, 2004. ...

AI Technical Summary

Problems solved by technology

This motion vector prediction fails in many cases to adequately predict the motion vectors for the macroblocks of the fields of an interlaced video frame

Images