SCALABLE VIDEO CODING USING INTER-LAYER PREDICTION OF SPATIAL INTRA PREDICTION PARAMETERS

摘要

The coding efficiency of scalable video coding is increased by substituting missing spatial intra prediction parameter candidates in a spatial neighborhood of a current block of the enhancement layer by use of intra prediction parameters of a co-located block of the base layer signal. By this measure, the coding efficiency for coding the spatial intra prediction parameters is increased due to the improved prediction quality of the set of intra prediction parameters of the enhancement layer, or, more precisely stated, the increased likelihood, that appropriate predictors for the intra prediction parameters for an intra predicted block of the enhancement layer are available thereby increasing the likelihood that the signaling of the intra prediction parameter of the respective enhancement layer block may be performed, on average, with less bits.

主权项

1. A scalable video decoder configured to
reconstruct a base layer signal from a coded data stream by
block-wise prediction,a block-wise selection between a spatial intra prediction and a temporal inter-prediction mode, andusing an intra prediction parameter for at least a subset of blocks of the base layer signal for which the spatial intra prediction mode has been selected, reconstruct an enhancement layer signal from the coded data stream by block-wise prediction, a block-wise selection between a spatial intra prediction and a temporal inter-prediction mode, and using an intra prediction parameter for at least a subset of blocks of the enhancement layer signal for which the spatial intra prediction mode has been selected, comprising
checking a neighboring block of the enhancement layer signal, neighboring a current block of the enhancement layer signal, as to whether same has been predicted using a spatial intra prediction mode;comprising, depending on the check,
the intra prediction parameter of the neighboring block in a set of probably advantageous intra prediction parameters for the current block, orthe intra prediction parameter of a block of the base layer signal, which is co-located to the current block, in the set of probably advantageous intra prediction parameters for the current block, anddetermine the intra prediction parameter for the current block based on a syntax element present in the coded data stream for the current block, and the set of probably advantageous intra prediction parameters.