Explicit signaling of collocated reference pictures for video coding

Explicit signaling of collocated reference pictures for video coding

  • CN 104,969,557 B
  • Filed: 02/01/2013
  • Issued: 11/06/2020
  • Est. Priority Date: 02/04/2012
  • Status: Active Grant
First Claim
Patent Images

1. A method for use in decoding a set of pictures in a video stream, comprising:

  • identifying a current picture of the set of pictures for decoding;

    determining a slice type for the current picture;

    in response to determining that the slice type for the current picture is not a B-type and is an I-type, not looking up an index of a collocated reference picture and not decoding a flag and the index of the collocated reference picture;

    in response to determining that the slice type for the current picture is B type or not B type and not I type,determining which of two reference picture lists to use to identify a collocated reference picture in the group of pictures according to the flag;

    in response to the marked first state, selecting a first reference picture list for identifying the collocated reference picture;

    in response to the marked second state, selecting a second reference picture list for identifying the collocated reference picture;

    determining whether a number of reference pictures in the selected reference picture list is greater than 1;

    in response to the number of reference pictures in the selected reference picture list being greater than 1, decoding an index of the collocated reference picture to identify the collocated reference picture in the selected reference picture list;

    orIn response to the number of reference pictures in the selected reference picture list not being greater than 1, identifying a unique reference picture in the selected reference picture list as the collocated reference picture if it is available or identifying the collocated reference picture in the selected reference picture list using a default value for the index;

    decoding the current picture using the flag and an index of the collocated reference picture.

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