METHOD AND APPARATUS FOR VIDEO CODING

• US 20140098883A1
• Filed: 10/08/2013
• Published: 04/10/2014
• Est. Priority Date: 10/09/2012
• Status: Abandoned Application

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Hannuksela, Miska Matias, Rusanovskyy, Dmytro
• Application Number:
  US14/048,650
• Publication Number:
  US 20140098883A1
• Time in Patent Office: Days
• US Class Current: 375/240.16
• CPC Class Codes: H04N 19/597 specially adapted for multi-view video sequence encoding
• CPC Class Codes: H04N 19/80 Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation H04N19/635, H04N19/86 take precedence

Abstract

There are disclosed various methods, apparatuses and computer program products for video encoding and decoding. In some embodiments information on a sampling grid of a current view component and information on a sampling grid of a reference view component is obtained and is used to select one or more resampling filter parameters for filtering at least a part of the reference view component to be used in one or more of inter-view prediction and view synthesis prediction of the current view component. In some embodiments the difference between the vertical sampling grid position of an interpolated reference view component and the vertical sampling grid position of the current view component is used to compensate a motion vector offset to be used in inter-view prediction of the current view component.

Claims

1. A method comprising:

obtaining information on a sampling grid of a current view component;

obtaining information on a sampling grid of a reference view component; and

performing one or more of the following;

using the obtained information to select one or more resampling filter parameters for filtering at least a part of the reference view component to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.

2. The method according to claim 1 further comprising:

obtaining information on a vertical sampling grid position of the reference view component;

obtaining information on a vertical sampling grid position of the current view component;

using the obtained information to select one or more resampling filter parameters for filtering the reference view component to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.

3. The method according to claim 2 further comprising:

providing an indication of the vertical sampling grid position of one or more of the reference view component and the current view component in a bitstream.

21. A computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause an apparatus to at least perform the method of claim 1.

4. A method comprising:

obtaining information on a vertical sampling grid position of a reference view component;

obtaining information on a vertical sampling grid position of the current view component;

determining the difference between the vertical sampling grid position of the reference view component and the vertical sampling grid position of the current view component;

using the difference to compensate a motion vector offset to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.

5. The method according to claim 4 further comprising one or more of the following:

providing an indication of the motion vector offset in a bitstream;

providing an indication indicative of the vertical sampling grid position of the current view component relative to the vertical sampling grid position of the reference view.

6. The method according to claim 4 further comprising:

concluding that the vertical sampling grid position of the reference view component differs from the vertical sampling grid position of the current view component;

wherein the method further comprises selecting an initial context for adaptive entropy coding of motion vector difference in such a manner that the initial context matches the difference in vertical sampling grid position.

7. The method according to claim 4 further comprising:

omitting the vertical motion vector difference coding in inter-view prediction and/or view synthesis prediction and/or inter-component motion prediction; and

deriving a vertical motion vector component to be equal to a vertical offset derived from the difference of the vertical sampling grid position between the current view component and the reference view component.

8. The method according to claim 7 further comprising:

using the vertical motion offset when accessing a residual of a predicted view component or a residual block for a predicted block.

9. The method according to claim 7 further comprising:

using the vertical motion offset, when the vertical motion offset has a non-integer value in full sample units, to interpolate a residual prior to using the residual for prediction of the residual information of the current view component or a block being encoded.

22. A computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause an apparatus to at least perform the method of claim 4.

10. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to:

obtain information on a sampling grid of a current view component;

obtain information on a sampling grid of a reference view component;

use the obtained information to select one or more resampling filter parameters for filtering at least a part of the reference view component to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.

11. The apparatus according to claim 10, said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to:

obtain information on a vertical sampling grid position of the reference view component;

obtain information on a vertical sampling grid position of the current view component;

use the obtained information to select one or more resampling filter parameters for filtering the reference view component to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.

12. The apparatus according to claim 11, said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to:

provide an indication of the vertical sampling grid position of one or more of the reference view component and the current view component in a bitstream.

13. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to:

obtain information on a vertical sampling grid position of a reference view component;

obtain information on a vertical sampling grid position of the current view component;

determine the difference between the vertical sampling grid position of the reference view component and the vertical sampling grid position of the current view component;

use the difference to compensate a motion vector offset to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.

14. The apparatus according to claim 13, said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to perform one or more of the following:

provide an indication of the motion vector offset in a bitstream.

provide the indication indicative of the vertical sampling grid position of the current view component relative to the vertical sampling grid position of the reference view.

15. The apparatus according to claim 13, said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to:

conclude that the vertical sampling grid position of the reference view component differs from the vertical sampling grid position of the current view component;

wherein said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to select an initial context for adaptive entropy coding of motion vector difference in such a manner that the initial context matches the difference in vertical sampling grid position.

16. The apparatus according to claim 13, said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to:

omit the vertical motion vector difference coding in inter-view prediction and/or view synthesis prediction and/or inter-component motion prediction; and

derive a vertical motion vector component to be equal to a vertical offset derived from the difference of the vertical sampling grid position between the current view component and the reference view component.

17. The apparatus according to claim 16, said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to:

use the vertical motion offset when accessing a residual of a predicted view component or a residual block for a predicted block.

18. The apparatus according to claim 16, said at least one memory stored with code thereon, which when executed by said at least one processor, further causes the apparatus to:

use the vertical motion offset, when the vertical motion offset has a non-integer value in full sample units, to interpolate a residual prior to using the residual for prediction of the residual information of the current view component or a block being encoded.

19. The apparatus according to claim 13 comprising a communication device comprising:

a user interface circuitry and user interface software configured to facilitate a user to control at least one function of the communication device through use of a display and further configured to respond to user inputs; and

a display circuitry configured to display at least a portion of a user interface of the communication device, the display and display circuitry configured to facilitate the user to control at least one function of the communication device.

20. The apparatus according to claim 19, said communication device comprising a mobile phone.

23. An apparatus comprising:

means for obtaining information on a sampling grid of a current view component;

means for obtaining information on a sampling grid of a reference view component;

means for using the obtained information to select one or more resampling filter parameters for filtering at least a part of the reference view component to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.

24. An apparatus comprising:

means for obtaining information on a vertical sampling grid position of a reference view component;

means for obtaining information on a vertical sampling grid position of the current view component;

means for determining the difference between the vertical sampling grid position of the reference view component and the vertical sampling grid position of the current view component;

means for using the difference to compensate a motion vector offset to be used in one or more of inter-view prediction and view synthesis prediction of the current view component.