Method and apparatus of depth prediction mode selection

• US 9,503,723 B2
• Filed: 01/10/2014
• Issued: 11/22/2016
• Est. Priority Date: 01/11/2013
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.), Santa Clara University
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.), Santa Clara University
• Inventors: Gu, Zhouye, Zheng, Jianhua, Ling, Nam, Zhang, Philipp
• Primary Examiner(s): Anyikire, Chikaodili E
• Assistant Examiner(s): Kalapodas, Dramos I
• Application Number:
  US14/152,904
• Publication Number:
  US 20140198179A1
• Time in Patent Office: 1,047 Days
• US Class Current: 1/1
• CPC Class Codes: H04N 19/11 among a plurality of spatial predictive coding modes
• CPC Class Codes: H04N 19/124 Quantisation
• 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 19/147 according to rate distortion criteria rate-distortion as a criterion for motion estimation H04N19/567
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/184 the unit being bits, e.g. of the compressed video stream
• CPC Class Codes: H04N 19/597 specially adapted for multi-view video sequence encoding
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

There is disclosed a method, apparatus and computer program product for prediction mode selection for coding a block of a depth map. An ordered list of coding modes is obtained, wherein the ordered list of coding modes comprises a plurality of coding modes each of which is capable of being used for coding of the block. A plurality of depth modeling modes (DMMs) each of which is capable of being used for coding of the block are obtained. And whether a DMM of the plurality of DMMs is to be added into the ordered list of coding modes in accordance with a decision condition is determined.

Claims

1. A method for a pre-selection process in encoding a block of depth data for a video frame, comprising:

obtaining a list including one or more depth data coding modes;

updating the list with at least one or more Depth Modeling Modes (DMMs);

selecting one or more depth data coding modes from the list to encode the block of depth data for the video frame; and

encoding at least one block of depth data for a video frame according to the selection of the one or more depth data coding modes;

when a first mode in the list of the one or more depth data coding modes is not a planar coding mode, and a second mode in the list of the one or more depth data coding modes is a DC mode, adding the one or more DMMs into the list;

when a first mode in the list of the one or more depth data coding modes is a planar coding mode, and a size of a Coding Unit (CU) is larger than 4×

4, adding the one or more DMMs into the list, wherein the block of the depth data comprises one or more CUs;

when a first mode in the list of the one or more depth data coding modes is a planar coding mode, adding the one or more DMMs into the list when a second mode in the list of the one or more depth data coding modes is a DC mode; and

adding a different one or more DMMs into the list when the second mode in the list of the one or more depth data coding modes is not a DC mode.

2. The method of claim 1, further comprising:

not updating the list when not adding the one or more DMMs into the list.

3. The method of claim 1, further comprising:

skipping cost calculation of the list in the encoding process of the depth data when the list being not updated.

4. The method of claim 1, further comprising:

when a first mode in the list of the one or more depth data coding modes is a flat coding mode, adding the one or more DMMs into the list, wherein the flat coding mode comprises a planar mode or a DC mode.

5. The method of claim 1, further comprising:

when a first mode in the list of the one or more depth data coding modes is a planar mode, the one or more DMMs not being added into the list.

6. An apparatus of performing a pre-selection process in encoding a block of depth data for a video frame, comprising:

a memory comprising a plurality of instructions; and

a processor being coupled to the memory and executing the instructions to;

obtain a list including one or more depth data coding modes;

update the list with at least one or more Depth Modeling Modes (DMMs);

select one or more depth data coding modes from the list to encode the block of depth data for the video frame; and

encode at least one block of depth data for a video frame according to the selection of the one or more depth data coding modes;

wherein the processor further executes the instructions to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is not a planar coding mode and a second mode in the list of the one or more depth data coding modes is a DC mode;

wherein the processor further executes the instructions to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar coding mode and a size of a Coding Unit (CU) is larger than 4×

4, wherein the block of the depth data comprises one or more CUs;

wherein the processor further executes the instructions to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar coding mode and when a second mode in the list of the one or more depth data coding modes is a DC mode; and

adding a different one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar coding mode and when the second mode in the list of the one or more depth data coding modes is not a DC mode.

7. The apparatus of claim 6, wherein the processor further executes the instructions not to update the list when the one or more DMMs are not added into the list.

8. The apparatus of claim 6, wherein the processor further executes the instructions to skip cost calculation of the list in the encoding process of the depth data when the list is not updated.

9. The apparatus of claim 6, wherein the processor further executes the instructions to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a flat coding mode, wherein the flat coding mode comprises a planar mode or a DC mode.

10. The apparatus of claim 6, wherein the processor further executes the instructions not to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar mode.

11. An encoder encoding a block of depth data for a video frame, wherein the encoder comprises one or more prediction units (PUs) performing a prediction mode selection in the encoding process for the encoder, and the one or more PUs are configured to:

obtain a list including one or more depth data coding modes, the coding modes being used to code a block of depth data for a video frame;

update the list with at least one or more Depth Modeling Modes (DMMs);

select one or more depth data coding modes from the list to encode the block of depth data for the video frame; and

encode at least one block of depth data for a video frame according to the selection of the one or more depth data coding modes;

wherein the one or more PUs are further configured to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is not a planar coding mode and a second mode in the list of the one or more depth data coding modes is a DC mode;

wherein the one or more PUs are further configured to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar coding mode and a size of a Coding Unit (CU) is larger than 4×

4, wherein the block of the depth data comprises one or more CUs; and

wherein the one or more PUs are further configured to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar coding mode and when a second mode in the list of the one or more depth data coding modes is a DC mode; and

adding a different one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar coding mode and when the second mode in the list of the one or more depth data coding modes is not a DC mode.

12. The encoder of claim 11, wherein the one or more PUs are further configured not to update the list when the one or more DMMs are not added into the list.

13. The encoder of claim 11, wherein the one or more PUs are further configured to skip cost calculation of the list in the encoding process of the depth data when the list is not updated.

14. The encoder of claim 11, wherein the one or more PUs are further configured to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a flat coding mode, wherein the flat coding mode comprises a planar mode or a DC mode.

15. The encoder of claim 11, wherein the one or more PUs are further configured not to add the one or more DMMs into the list when a first mode in the list of the one or more depth data coding modes is a planar mode.