FIXED INTRA RUN-LEVEL MODE FOR CAVLC IN HEVC

• US 20130114687A1
• Filed: 11/10/2011
• Published: 05/09/2013
• Est. Priority Date: 11/07/2011
• Status: Abandoned Application

• Current Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kim, Seung-Hwan, Segall, Christopher A.
• Application Number:
  US13/294,128
• Publication Number:
  US 20130114687A1
• Time in Patent Office: Days
• US Class Current: 375/240.03
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 19/18 the unit being a set of transform coefficients
• CPC Class Codes: H04N 19/625 using discrete cosine transform [DCT]
• CPC Class Codes: H04N 19/93 Run-length coding

Abstract

An electronic device configured for fixed intra run-level mode is described. The electronic device includes a processor and instructions stored in memory that is in electronic communication with the processor. The electronic device obtains a symbol, e.g. a run-lev pair. The electronic device determines whether a fixed intra run-level mode condition is met. If the condition is met, the electronic device uses fixed intra run-level mode to determine a ‘cn’ value for the symbol. If the condition is not met, the electronic device does not use the fixed intra run-level mode to determine the ‘cn’ value for the symbol. The electronic device run-level codes at least a portion of video data based on the determined ‘cn’ value.

Claims

1. An electronic device, comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to;

obtain a run-lev pair;

determine whether to process the run-lev pair in a fixed intra run-level mode;

determine a first cn value for the run-lev pair according to the fixed intra run-level mode if it is determined to process the run-lev pair in the fixed intra run-level mode;

determine a second cn value for the run-lev pair if it is determined not to process the run-lev pair in the fixed intra run-level mode; and

run-level code video data using one of the first and second cn values.

2. The electronic device of claim 1, wherein, if the run-lev pair corresponds to inter information, the second cn value is a different value than the first cn value.

3. The electronic device of claim 1, wherein determine the second cn value for the run-lev pair if it is determined not to process the run-lev pair in the fixed intra run-level mode further comprises:

identify a plurality of mapping algorithms;

select one of the plurality of mapping algorithms according to a particular characteristic of the run-lev pair; and

determine the second cn value using the selected one of the plurality of mapping algorithms.

4. The electronic device of claim 3, wherein determine the first cn value for the run-lev pair according to the fixed intra run-level mode if it is determined to process the run-lev pair in the fixed intra run-level mode further comprises:

employ a particular one of the mapping algorithms for processing the run-lev pair.

5. The electronic device of claim 4, wherein the particular one of the mapping algorithms is employed independently of whether the run-lev pair is associated with the particular characteristic.

6. The electronic device of claim 3, wherein determine the second cn value for the run-lev pair if it is determined not to process the run-lev pair in the fixed intra run-level mode further comprises:

determine whether the run-lev pair corresponds to inter information or intra information;

wherein the selection is based on a result of the inter/intra determination.

7. The electronic device of claim 3, wherein determine the first cn value for the run-lev pair according to the fixed intra run-level mode if it is determined to process the run-lev pair in the fixed intra run-level mode further comprises:

employ a particular one of the mapping algorithms for processing the run-lev pair;

wherein the particular one of the mapping algorithms is employed regardless of whether the run-lev pair corresponds to inter information or intra information.

8. The electronic device of claim 1, wherein the determination of whether to process the run-lev pair in the fixed intra run-level mode is based on at least one of bit rate, resolution, trailing one (TR1), and block type of a block of Transformed and Quantized Coefficients (TQCs) corresponding to the run-lev pair.

9. The electronic device of claim 8, wherein the determination of whether to process the run-lev pair in the fixed intra run-level mode is based on whether the block of TQCs corresponds to a bit rate greater than a first preset threshold.

10. The electronic device of claim 8, wherein the determination of whether to process the run-lev pair in the fixed intra run-level mode is based on whether the block of TQCs corresponds to a resolution greater than a second preset threshold.

11. The electronic device of claim 8, wherein the determination of whether to process the run-lev pair in the fixed intra run-level mode is based on whether the block of TQCs represents luma only.

12. The electronic device of claim 8, wherein the determination of whether to process the run-lev pair in the fixed intra run-level mode is based on whether the block of TQCs includes a trailing one value that is equal to zero.

13. The electronic device of claim 8, wherein determining whether to process the run-lev pair in the fixed intra run-level mode further comprises checking a fixed intra run-level mode flag.

14. The electronic device of claim 13, wherein the instructions are further executable to set the fixed intra run-level mode flag to true if a block of TQCs corresponding to the run-lev pair corresponds to a bit rate greater than a first preset threshold, a resolution greater than a second preset threshold, and corresponds to luma only.

15. The electronic device of claim 14, wherein the instructions are further executable to set the fixed intra run-level mode flag to true if a block of TQCs corresponding to the run-lev pair corresponds to the bit rate greater than the first preset threshold, the resolution not greater than the second preset threshold, and the trailing block of TQCs includes a trailing one equal to zero.

16. An electronic device configured for selective run-level coding (SRLC), comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to;

obtain a block of transformed and quantized coefficients (TQCs);

determine whether to skip run-level coding;

level code any remaining TQCs if it is determined to skip run-level coding;

run-level code one or more TQCs if it is determined not to skip run-level coding; and

level code any remaining TQCs if it is determined not to skip run-level coding;

wherein the instructions are further executable to;

if run-level coding is not skipped, obtain a run-lev pair of the block of TQCs;

determine whether to process the run-lev pair in a fixed intra run-level mode;

determine a first cn value for the run-lev pair according to the fixed intra run-level mode if it is determined to process the run-lev pair in the fixed intra run-level mode;

determine a second cn value for the run-lev pair if it is determined not to process the run-lev pair in the fixed intra run-level mode; and

run-level code video data using one of the first and second cn values.

17. The electronic device of claim 16, wherein, if the run-lev pair corresponds to inter information, the second cn value is a different value than the first cn value.

18. A method, comprising:

obtaining a bit stream;

recovering an input value from the bit stream;

determining whether to process the recovered input value in a fixed intra run-level mode;

determining a first symbol for the recovered input value according to the fixed intra run-level mode if it is determined to process the recovered input value in the fixed intra run-level mode;

determining a second symbol for the recovered input value if it is determined not to process the recovered input value in the fixed intra run-level mode; and

recovering video data using one of the first and second symbols.

19. The method of claim 18, wherein, if the recovered input value does not correspond to intra information, the second symbol is a different value than the first symbol.

20. The method of claim 18, wherein the determination of whether to process the recovered input value in the fixed intra run-level mode is based on at least one of bit rate, resolution, trailing one (TR1), and block type of a block of Transformed and Quantized Coefficients (TQCs) corresponding to the recovered input value.