Encoder and decoder and methods thereof for encoding/decoding a picture of a video sequence
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsJonatan SAMUELSSON, Rickard SJÖBERG
Life of this patent
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Abstract
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.
Claims8
A decoder for managing reference pictures to be used for decoding an encoded representation of a picture of a video sequence, the decoder configured to:
- decode, from a slice header, a plurality of Picture Order Count (POC) values;
- for each POC value of the plurality of POC values:
- if the POC value indicates a long-term reference picture and there is a reference picture in a decoded picture buffer (DPB) with a POC value that matches the POC value, then include the matching reference picture in the DPB in a long-term reference picture set;
- and
- otherwise, if the POC value indicates a short-term reference picture and there is a reference picture in the DPB with a POC value that matches the POC value, then include the matching short-term reference picture in the DPB in a short-term reference picture set;
- and
- mark all pictures in the DPB that are not included in either the long-term reference picture set or the short-term reference picture set as unused for reference.
A method for managing reference pictures to be used for decoding an encoded representation of a picture of a video sequence, the method being implemented in a decoder, the method comprising:
- decoding, from a slice header, a plurality of Picture Order Count (POC) values;
- for each POC value of the plurality of POC values:
- if the POC value indicates a long-term reference picture and there is a reference picture in a decoded picture buffer (DPB) with a POC value that matches the POC value, then including the matching reference picture in the DPB in a long-term reference picture set;
- and
- otherwise, if the POC value indicates a short-term reference picture and there is a reference picture in the DPB with a POC value that matches the POC value, then including the matching short-term reference picture in the DPB in a short-term reference picture set;
- and
- marking all pictures in the DPB that are not included in either the long-term reference picture set or the short-term reference picture set as unused for reference.
Dependencies are inferred from the claim text.