Entropy coding for video encoding and decoding
Encoding or decoding syntax information associated with video information can involve identifying a coding context associated with a syntax element of a current coding unit of the video information, wherein the identifying occurs without using a syntax element of a neighboring block, and encoding or decoding the syntax element of the current coding unit based on the coding context.
1 . A method for decoding syntax information associated with video information comprising:
selecting a coding context associated with a syntax element of a coding unit of the video information, the syntax element of the coding unit comprising an adaptive motion vector resolution flag and wherein the coding context is selected among two coding contexts and the selecting is based on determining an affine mode of the coding unit and independently of an adaptive motion vector resolution flag of a neighboring block of the coding unit;
decoding the syntax element of the coding unit based on the coding context; and
decoding the coding unit based on the syntax element.
2 . The method of claim 1 , wherein the syntax element of the coding unit further comprises a skip mode flag, a triangular prediction mode, a current picture referencing mode, an adaptive loop filter mode, a partitioning mode, or an affine mode.
3 . The method of claim 1 , wherein selecting based on determining an affine mode of the coding unit uses only an inter-affine flag.
4 . The method of claim 1 , wherein the coding context is selected using an OR value of the corresponding syntax elements of a left neighboring block of the coding unit and of a neighboring block above the coding unit.
5 . The method of claim 1 , wherein the coding context is selected using an AND value of the corresponding syntax elements of a left neighboring block of the coding unit and of a neighboring block above the coding unit.
6 . A non-transitory computer readable medium storing executable program instructions to cause a computer executing the instructions to perform a method according to claim 1 .
7 . An apparatus for decoding syntax information associated with video information comprising:
one or more processors configured to:
select a coding context associated with a syntax element of a coding unit of the video information, the syntax element of the coding unit comprising an adaptive motion vector resolution flag and wherein the coding context is selected among two coding contexts based on a determination of an affine mode of the coding unit and independently of an adaptive motion vector resolution flag of a neighboring block of the coding unit;
decode the syntax element of the coding unit based on the coding context; and
decode the coding unit based on the syntax element.
8 . The apparatus of claim 7 , wherein selecting based on determining an affine mode of the coding unit uses only an inter-affine flag.
9 . The apparatus of claim 7 , further comprising:
at least one of (i) an antenna configured to receive a signal, the signal including data representative of the video information, (ii) a band limiter configured to limit the received signal to a band of frequencies that includes the data representative of the video information, or (iii) a display configured to display an image from the video information.
10 . The apparatus of claim 9 , wherein the apparatus comprises one of a television, a television signal receiver, a set-top box, a gateway device, a mobile device, a cell phone, a tablet, or other electronic device.
11 . The apparatus of claim 7 , wherein the syntax element of the coding unit further comprises a skip mode flag, a triangular prediction mode, a current picture referencing mode, an adaptive loop filter mode, a partitioning mode, or an affine mode.
12 . The apparatus of claim 7 , wherein the one or more processors are further configured to select the coding context using an OR value of the corresponding syntax elements of a left neighboring block of the coding unit and of a neighboring block above the coding unit.
13 . The apparatus of claim 7 , wherein the one or more processors are further configured to select the coding context using an AND value of the corresponding syntax elements of a left neighboring block of the coding unit and of a neighboring block above the coding unit.
14 . A method for encoding syntax information associated with video information comprising:
selecting a coding context associated with a syntax element of a coding unit of the video information, the syntax element of the coding unit comprising an adaptive motion vector resolution flag and wherein the coding context is selected among two coding contexts and the selecting is based on determining an affine mode of the coding unit and independently of an adaptive motion vector resolution flag of a neighboring block of the coding unit;
encoding the syntax element of the coding unit based on the coding context; and
encoding the coding unit based on the syntax element.
15 . The method of claim 14 , wherein selecting based on determining an affine mode of the coding unit uses only an inter-affine flag.
16 . The method of claim 14 , wherein the syntax element of the coding unit further comprises of a skip mode flag, a triangular prediction mode, a current picture referencing mode, an adaptive loop filter mode, a partitioning mode, or an affine mode.
17 . A non-transitory computer readable medium storing data generated according to the method of claim 14 and representing a bitstream, formatted to include syntax elements and encoded image information.
18 . An apparatus for encoding syntax information associated with video information comprising:
one or more processors configured to:
select a coding context associated with a syntax element of a coding unit of the video information, the syntax element of the coding unit comprising an adaptive motion vector resolution flag and wherein the coding context is selected among two coding contexts based on a determination of an affine mode of the coding unit and independently of an adaptive motion vector resolution flag of a neighboring block of the coding unit;
encode the syntax element of the coding unit based on the coding context; and
encode the coding unit based on the syntax element.
19 . The apparatus of claim 18 , wherein selecting based on determining an affine mode of the coding unit uses only an inter-affine flag.