Methods and systems for entropy coder initialization

Patent metadata

Field	Value
Publication number	US-9313514-B2
Application number	US-89677810-A
Country	US
Kind code	B2
Filing date	Oct 1, 2010
Priority date	Oct 1, 2010
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Aspects of the present invention are related to systems and methods for initialization of entropy encoders and decoders.

First claim

What is claimed is:

1. A method for decoding a video frame in a video sequence, the method comprising:
receiving a slice header and information including: (i) first information indicating a number of second regions in a first region, and (ii) second information indicating an offset of an i-th second region from an (i−1)th second region in a bitstream, wherein the video frame includes one or more of the first regions and one or more the second regions;
identifying a slice type of a slice;
receiving a flag with only one of: (i) a first value indicating first initialization information and (ii) a second value indicating second initialization information;
initializing a Context-Adaptive Binary Arithmetic Coding (CABAC) context associated with the slice type using the initialization method which is selected using the identified slice type and the received flag; and
decoding the video frame using the identified slice type and the received flag; wherein
in a case that the identified slice type indicates a B-slice type and the value of the flag is equal to the first value, the step of initializing the CABAC context associated with the slice type uses a first initialization method; and
in a case that the identified slice type indicates the B-slice type and the value of the flag is equal to the second value, the step of initializing the CABAC context associated with the slice type uses a second initialization method.

2. The method of claim 1 , wherein the flag is provided in the slice header.

Assignees

• Misra Kiran
• Segall Christopher A
• Sharp Kk

Inventors

• Misra Kiran
• Segall Christopher A

Classifications

• H04N19/13 Primary

  Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC] · CPC title

• H04N19/436 Primary

  using parallelised computational arrangements · CPC title

• H04N19/197

  including determination of the initial value of an encoding parameter (H04N19/56 takes precedence) · CPC title

• H04N19/174

  the region being a slice, e.g. a line of blocks or a group of blocks · CPC title

• H04N19/124

  Quantisation · CPC title