Video coding system using implied reference frames

摘要

A video coding/decoding system builds implied reference frames from a plurality of reference frames developed during coding. Coded data of reference pictures are decoded and stored in a reference picture cache. An implied reference frame may be derived from a plurality of reference frames and may be stored in the reference picture cache. Thereafter, coding of new input data may proceed using the implied reference frame as a source of prediction. The method may be used to identify visual elements such as background elements that may persist in video over a longer period that can be captured by the system under conventional reference frames assembly and eviction. Implied reference frames may be built at both an encoder and a decoder to serve as sources of prediction.

主权项

1. A video coder management method, comprising:
decoding coded data of a plurality of reference pictures, the coded reference picture data having been transmitted in a channel between an encoder and a decoder, storing the decoded reference pictures in a reference picture cache, building a new, implied reference picture from a plurality of the stored reference pictures, and storing the newly built implied reference picture in the reference picture cache, wherein the method is executed at an encoder and the reference picture cache storing the reference pictures and implied reference picture is located at the encoder, transmitting a message to a decoder commanding the decoder to derive an implied reference frame, and predictively coding a new input frame with reference to the stored implied reference picture only after receipt of an acknowledgment to the message from the decoder.