US 9,813,722 B2
Video encoding and decoding
Miska Matias Hannuksela, Tampere (FI)
Assigned to Nokia Technologies Oy, Espoo (FI)
Filed by Nokia Technologies Oy, Espoo (FI)
Filed on Dec. 1, 2014, as Appl. No. 14/556,504.
Claims priority of provisional application 61/910,616, filed on Dec. 2, 2013.
Prior Publication US 2015/0156501 A1, Jun. 4, 2015
Int. Cl. H04N 19/30 (2014.01); H04N 19/172 (2014.01); H04N 19/50 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/30 (2014.11) [H04N 19/70 (2014.11); H04N 19/50 (2014.11)] 18 Claims
OG exemplary drawing
 
1. A method comprising:
encoding pictures into a bitstream, the bitstream comprising at least two scalability layers, pictures being associated with access units and pictures being associated individually with one of the at least two scalability layers;
indicating in the bitstream inter-layer prediction dependencies, indicative of direct reference layers, if any, of a first scalability layer and indirect reference layers, if any, of the first scalability layer, a direct reference layer being such that a picture associated with the direct reference layer is useable as a reference picture for prediction of a picture associated with the first scalability layer, and an indirect reference layer being such that a picture associated with an indirect reference layer is unusable as a reference picture for prediction of a picture associated with the first scalability layer but useable as a reference picture for prediction of a picture associated with a direct or indirect reference layer of the first scalability layer;
selecting an earlier picture in decoding order as a basis for deriving picture order count (POC) related variables for a current picture based on a pre-defined algorithm, the current picture being associated with a current scalability layer,
wherein the earlier picture is the closest preceding picture, in decoding order, to the current picture among a set of pictures that are associated with the current scalability layer or any direct or indirect reference layer of the current scalability layer, and
wherein the method further comprises as a part of or in connection with encoding the current picture into the bitstream:
determining that POC values are to be reset;
encoding into the bitstream an indication of resetting POC values; and
using the earlier picture in deriving a value decremented from POC values of all of a plurality of pictures in a decoded picture buffer.