Encoder and decoder and methods thereof for encoding/decoding a picture of a video sequence

摘要

An object of the embodiments is to achieve an improved reference picture handling. That is achieved by taking into account whether the reference pictures in the decoded picture buffer are long-term reference pictures or short-term reference pictures when determining how they should be marked when the information of the reference picture set is received. The reference pictures are marked as “used for short-term reference” or “used for long-term reference” in the Decoded Picture Buffer (DPB) depending on whether they are included as short-term pictures or long-term pictures in the RPS of a current picture.

主权项

1. A method, performed by a decoder, for managing reference pictures to be used for decoding an encoded representation of a picture of a video sequence, the method comprising:
decoding a reference picture set received from an encoder, wherein the reference picture set comprises information about the reference pictures to be kept in a decoded picture buffer; decoding a Picture Order Count (POC) value indicated in the reference picture set; determining if the POC value indicated in the reference picture set corresponds to a short-term reference picture or a long-term reference picture; if the POC value indicated in the reference picture set corresponds to a long-term reference picture:
if there is a long-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set, keeping the long-term reference picture in the decoded picture buffer as a long-term reference picture;if there is a short-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set and there is not a long-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set, marking the short-term reference picture in the decoded picture buffer as a long-term reference picture and keeping it in the decoded picture buffer; if the POC value indicated in the reference picture set corresponds to a short-term reference picture:
if there is a short-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set, keeping the short-term reference picture in the decoded picture buffer as a short-term reference picture.