Patent Document ID: 20150023409
Application ID: 14511200
Patent Status: 0

Claim One:
1. Decoder for reconstructing a picture from a datastream into which the picture is coded in units of slices into which the picture is partitioned, wherein the decoder is configured to decode the slices from the datastream in accordance with a slice order and the decoder is responsive to a syntax element portion within a current slice of the slices, so as to decode the current slice in accordance with one of at least two modes, and in accordance with a first of the at least two modes, decode the current slice from the datastream using context adaptive entropy decoding comprising a derivation of contexts across slice boundaries, a continuous update of symbol probabilities of the contexts and an initialization of the symbol probabilities depending on saved states of symbol probabilities of a previously decoded slice, and in accordance with a second of the at least two modes, decode the current slice from the datastream using context adaptive entropy decoding with restricting the derivation of the contexts so as to not cross the slice boundaries, a continuous update of symbol probabilities of the contexts and an initialization of the symbol probabilities independent on any previously decoded slice.