LIN JIAN-LIANG (CN)
ZHANG KAI (CN)
AN JICHENG (CN)
LIN JIAN-LIANG (CN)
ZHANG KAI (CN)
| WO2007110757A2 | 2007-10-04 |
| US20120075436A1 | 2012-03-29 | |||
| CN101292538A | 2008-10-22 | |||
| CN102257818A | 2011-11-23 | |||
| KR20060108475A | 2006-10-18 |
| CLAIMS I . A method of reference view selection for multi-view video coding or 3D video coding, used for inter-view motion prediction (IVMP) and inter-view residual prediction (IVRP), comprising determining a reference view for performing IVMP and IVRP. 2. The method as claimed in claim 1, the reference view for IVMP and IVRP is unified. 3. The method as claimed in claim 1, the reference view is a reference picture in current reference picture lists. 4. The method as claimed in claim 1, the reference view is signaled in a bitstream. 5. The method as claimed in claim 4, first information is signaled to indicate which reference picture list is selected, and second information is signaled to indicate which reference picture in the reference picture list indicated by the first information is used as the reference view for IVMP and IVRP. 6. The method as claimed as claim 5, the first information is transmitted only when the slice type is B slice. 7. The method as claimed in claim 4, the reference view is signaled in slice level. 8. The method as claimed in claim 4, the reference view is signaled in video, view, picture, sequence level, or LCU, CU, PU level, including VPS, SPS, PPS or PS. 9. The method as claimed in claim 3, the reference view is the same inter-view reference picture for every slice in one picture. 10. The method as claimed in claim 1, the reference view selection is according to a fixed algorithm. I I . The method as claimed in claim 10, the reference view is the view with index equal to 0. 12. The method as claimed in claim 10, the reference view is the view that is included in one of the reference lists with the smallest view index. 13. The method as claimed in claim 10, the reference view is the view that closest to a current view (in terms of view index) that is included in one of the reference lists. 14. The method as claimed in claim 10, the reference view is implicitly derived by both encoder and decoder. 15. The method as claimed in claim 14, wherein the reference view is implicitly derived by the encoder and decoder according to view ID. 16. The method as claimed in claim 4, wherein the reference view is not signaled if there are no more than one inter- view reference in reference lists. |
PREDICTION
TECHNICAL FIELD The invention relates generally to Three-Dimensional (3D) video processing. In particular, the present invention relates to methods for reference view derivation for inter-view motion prediction (IVMP) and inter-view residual prediction (IVRP).
BACKGROUND
3D video coding is developed for encoding or decoding video data of multiple views simultaneously captured by several cameras. Since all cameras capture the same scene from different viewpoints, multi-view video data contains a large amount of inter-view redundancy. To exploit the inter-view redundancy, additional tools which employ DV such as inter-view motion prediction (IVMP), and inter-view residual prediction (IVRP), have been integrated to conventional 3D-HEVC (High Efficiency Video Coding) or 3D-AVC (Advanced Video Coding) codec.
When IVMP is applied for a current prediction unit (PU), a disparity vector (DV) is firstly derived for current PU and then the motion information of the reference block in the reference view that is referenced by the DV is used for predicting the motion information of the current PU. When IVRP is applied for a current PU, a DV is firstly derived for a current PU and the residual block in the reference view that is referenced by the DV is used for predicting the residual of the current PU.
Therefore, the IVMP needs to access the motion data in the reference view, and the IVRP needs to access the residual data in the reference view.
In current HTM6.0, the reference view for IVMP is the view that is included in one of the reference lists with the smallest view index. On the other hand, the reference view for IVRP is the view with index equal to 0. The IVRP is currently combined with IVMP in merge mode, therefore the reference view for IVMP and IVRP should be the same.
In order to unify these two kinds of reference view, facilitate the management of decoded motion and residual data, and provide more flexibility for reference view selection, a more general reference view selection approach is proposed.
SUMMARY
This invention proposes to unify the reference view for IVMP and IVRP by providing the syntax to identify the picture of reference view from the reference lists and prohibiting the reference view to change on every slice. The proposed method has benefits for the management of decoded motion and residual data, and provides more flexibility for reference view selection, with little impact on coding efficiency.
This invention also proposes to unify the reference view for IVMP and IVRP by the fixed reference view selection algorithm instead of explicit signaling, such as either one of the current reference view selection algorithm for IVMP or IVRP.
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:
Fig.l is a diagram illustrating the proposed new syntax according to an embodiment of the invention.
DETAILED DESCRIPTION
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.
The situation of the reference view selection here is similar to that of the collocated reference picture selection in HEVC. Therefore, imitating the collocated reference picture selection, it is proposed to signal the reference view in slice header from the reference lists since the reference view choice must be available to every slice to preserve error resiliency, and semantically restrict the selection to always point to the same inter-view reference picture for every slice in a picture since the frequent reference view changes will create a performance burden for decoder. The proposed syntax table is shown in Fig. 1.
The new syntax element simply gives the reference index of the reference view picture, from list 0 in P slices and from either list 0 or list 1 (according to refoiew Jrom O Jlag) in B slices. This value is semantically restricted to always point to the same inter-view reference picture for every slice in a picture.
This invention also proposes to unify the reference view for IVMP and IVRP by the fixed reference view selection algorithm instead of explicit signaling, such as either one of the current reference view selection algorithm for IVMP or IVRP.
The reference view selection methods described above can be used in a video encoder as well as in a video decoder. Embodiments of disparity vector derivation methods according to the present invention as described above may be implemented in various hardware, software codes, or a combination of both. For example, an embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein. An embodiment of the present invention may also be program codes to be executed on a Digital Signal Processor (DSP) to perform the processing described herein. The invention may also involve a number of functions to be performed by a computer processor, a digital signal processor, a microprocessor, or field programmable gate array (FPGA). These processors can be configured to perform particular tasks according to the invention, by executing machine-readable software code or firmware code that defines the particular methods embodied by the invention. The software code or firmware codes may be developed in different programming languages and different format or style. The software code may also be compiled for different target platform. However, different code formats, styles and languages of software codes and other means of configuring code to perform the tasks in accordance with the invention will not depart from the spirit and scope of the invention.
The invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described examples are to be considered in all respects only as illustrative and not restrictive. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
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