WO2015051497A1 - Compatible slice segment header - Google Patents

Abstract

This contribution proposes to move syntax elements related to Three-Dimensional High Efficiency Video Coding (3D-HEVC) from slice segment header to slice segment header extension. In this way, slice segment header in 3D-HEVC can be compatible with that in HEVC.

Description

COMPATIBLE SLICE SEGMENT HEADER

TECHNICAL FIELD

[0001] The invention relates generally to Three-Dimensional (3D) video processing. In particular, the presented invention relates to High Efficiency Video Coding (HEVC) compatible slice segment header in 3D-HEVC.

BACKGROUND

[0002] In the current 3D-HEVC, some syntax elements related to 3D-HEVC is signalled in slice segment header (SSH) as depicted in Table 1. MvHevcCompatibilityFlag is set equal to (!vps_extension2_flag). Since vps_extension2_flag is signaled in 3D-HEVC but not in HEVC, an HEVC conformance decoder cannot parse SSH in 3D-HEVC correctly.

Table 1. Syntax elements related to 3D-HEVC in slice segment header

SUMMARY [0003] In light of the previously described problems, an HEVC compatible slice segment header coding method in 3D-HEVC is proposed. It is proposed to move syntax elements related to 3D-HEVC from slice segment header to slice segment header extension. In this way, slice segment header in 3D-HEVC can be compatible with that in HEVC.

[0004] Other aspects and features of the invention will become apparent to those with ordinary skill in the art upon review of the following descriptions of specific embodiments.

BRIEF DESCRIPTION OF DRAWINGS

The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

[0005] Fig. 1 is a diagram illustrating the parsing process for SSH and SSHE in 3D-HEVC as proposed.

DETAILED DESCRIPTION

[0006] The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

[0007] It is proposed to signal syntax elements related to 3D-HEVC in slice segment header extension (SSHE) instead of slice header segment as depicted in Table 2 and Table 3. In the proposed HEVC compatible design, SSH in 3D-HEVC can be parsed by an HEVC conformance decoder, thus the SSH coding/parsing module in HEVC can be reused by 3D-HEVC. Fig.l demonstrates the proposed parsing process for SSH and SSHE in 3D-HEVC.

[0008] It is also proposed that syntax elements related to depth coding in 3D- HEVC should not be signalled in SSH. Similarly, they should be signalled in SSHE.

Table 4 shows an exemplary syntax element: depth_coding_tool_flag. Table 2. Proposed SSH

Table 3. Proposed SSHE

slice segment header extension( ) { Descr iptor if( !( weighted_pred_flag && slice type = = P ) &&

!( weighted bipred flag && slice type = = B ) &&

layer id && !MvHevcCompatibilityFlag )

{

slice ic enable flag u(l) if( slice ic enable flag )

slice ic disable merge zero idx flag u(l)

}

}

Table 4. An exemplary SSHE for depth coding slice segment header extension( ) { Descri ptor if( isDepth)

depth coding tool flag u(l)

...

}

Claims

1. A method of signaling slice segment header (SSH) in 3D-HEVC compatible with that HEVC, wherein a conformance decoder:

a) parses a slice segment header (SSH) of a 3D video bitstream using a decoding module conformed to 2D video decoding;

b) parses slice-level-syntax elements corresponding to coding tools related to interview coding or depth coding in a slice segment header extension (SSHE) of the 3D video bitstream; and

c) decodes the 3D video bitstream according to information parsed from the SSH and SSHE.

2. The method as claimed in claim 1, wherein SSH in 3D-HEVC can be parsed correctly by an HEVC conformance decoder.

3. The method as claimed in claim 1, wherein a 3D-HEVC conformance decoder can use the SSH parsing module in HEVC to parse SSH.

4. The method as claimed in claim 1, wherein a 3D-HEVC conformance encoder can use the SSH coding module in HEVC to code SSH.

5. The method as claimed in claim 1, wherein syntax elements related to 3D- HEVC are not signalled in SSH.

6. The method as claimed in claim 1, wherein syntax elements related to 3D- HEVC can be signalled in a slice segment header extension (SSHE).

7. The method as claimed in claim 6, wherein syntax elements related to 3D- HEVC can be signalled in one or more than one SSHEs. For example, there may be two extensions for a slice segment header, noted as SSHEl and SSHE2. syntax elements related to 3D-HEVC can be signalled in SSHEl, or in SSHE2, or both.

8. The method as claimed in claim 5-claim7, wherein syntax elements related to 3D-HEVC includes but not limited to slice ic enable flag and slice ic disable merge zero idx flag.

9. The method as claimed in claim 1, wherein an HEVC conformance decoder can ignore any syntax elements related to 3D-HEVC in SSH or SSHE.

10. The method as claimed in claim 5- claim 9, wherein syntax elements related to 3D-HEVC includes but not limited to:

syntax elements related to interview coding; and

syntax elements related to depth coding.