WEIGHTED PREDICTION FOR SCREEN CONTENT CODING AND MULTI-LAYER CODING

• US 20170244966A1
• Filed: 02/16/2017
• Published: 08/24/2017
• Est. Priority Date: 02/20/2016
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Joshi, Rajan Laxman, Wang, Ye-Kui, Rapaka, Krishnakanth, Karczewicz, Marta
• Application Number:
  US15/434,957
• Publication Number:
  US 20170244966A1
• Time in Patent Office: Days
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/126 Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/187 the unit being a scalable video layer
• CPC Class Codes: H04N 19/30 using hierarchical techniques, e.g. scalability H04N19/63 takes precedence
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/597 specially adapted for multi-view video sequence encoding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

A device for coding multi-layer video data is configured to determine a picture order count (POC) value for a current picture; determine a POC value for a reference picture; determine a layer identification (ID) value for the current picture; determine a layer ID value for the reference picture; conditionally receive a flag indicating whether weighted prediction is enabled or disabled by receiving the flag in response to at least one of two conditions being true and not receive the flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

Claims

1. A method of decoding multi-layer video data, the method comprising:

determining a picture order count (POC) value for a current picture of the multi-layer video data;

determining a POC value for a reference picture of the current picture;

determining a layer identification (ID) value for the current picture;

determining a layer ID value for the reference picture;

conditionally receiving a flag indicating whether weighted prediction is enabled or disabled, wherein conditionally receiving the flag comprises receiving the flag in response to at least one of two conditions being true and not receiving the flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture; and

decoding a block of the multi-layer video data of the current picture based on a determination of whether weighted prediction is enabled or disabled.

2. The method of claim 1, further comprising:

in response to receiving the flag and the flag indicating weighted prediction is enabled, receiving one or more weighted prediction parameters; and

predicting a block of the current picture using a weighted prediction process.

3. The method of claim 1, further comprising:

in response to receiving the flag and the flag indicating weighted prediction is disabled, decoding the current picture without receiving one or more weighted prediction parameters.

4. The method of claim 1, further comprising:

in response to not receiving the flag as a result of the two conditions being false, decoding the current picture without receiving one or more weighted prediction parameters.

5. The method of claim 1, wherein a first value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for a luma component of the current picture are present and a second value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for the luma component of the current picture are not present.

6. The method of claim 1, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for a luma component of the current picture, the method further comprising:

conditionally receiving a second flag indicating whether weighted prediction is enabled or disabled for a chroma component of the current picture, wherein conditionally receiving the second flag comprises receiving the second flag in response to at least one of two conditions being true and not receiving the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

7. The method of claim 1, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for reference pictures of a first reference picture list, the method further comprising:

conditionally receiving a second flag indicating whether weighted prediction is enabled or disabled for reference pictures of a second reference picture list, wherein conditionally receiving the second flag comprises receiving the second flag in response to at least one of two conditions being true and not receiving the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

8. The method of claim 1, further comprising:

receiving the multi-layer video data at a receiver of a wireless communication device;

storing the multi-layer video data in a memory of the wireless communication device; and

processing the multi-layer video data on one or more processors of the wireless communication device.

9. The method of claim 8, wherein the wireless communication device comprises a telephone handset and wherein receiving the multi-layer video data at the receiver of the wireless communication device comprises demodulating, according to a wireless communication standard, a signal comprising the multi-layer video data.

10. A device for decoding multi-layer video data, the device comprising:

a memory configured to store the multi-layer video data;

one or more processors configured to;

determine a picture order count (POC) value for a current picture of the multi-layer video data;

determine a POC value for a reference picture of the current picture;

determine a layer identification (ID) value for the current picture;

determine a layer ID value for the reference picture;

conditionally receive a flag indicating whether weighted prediction is enabled or disabled, wherein to conditionally receive the flag the one or more processors are further configured to receive the flag in response to at least one of two conditions being true and not receive the flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture; and

decode a block of the multi-layer video data of the current picture based on a determination of whether weighted prediction is enabled or disabled.

11. The device of claim 10, wherein the one or more processors are further conjured to:

in response to receiving the flag and the flag indicating weighted prediction is enabled, receive one or more weighted prediction parameters; and

predict a block of the current picture using a weighted prediction process.

12. The device of claim 10, wherein the one or more processors are further conjured to:

in response to receiving the flag and the flag indicating weighted prediction is disabled, decode the current picture without receiving one or more weighted prediction parameters.

13. The device of claim 10, wherein the one or more processors are further conjured to:

in response to not receiving the flag as a result of the two conditions being false, decode the current picture without receiving one or more weighted prediction parameters.

14. The device of claim 10, wherein a first value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for a luma component of the current picture are present and a second value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for the luma component of the current picture are not present.

15. The device of claim 10, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for a luma component of the current picture, the, wherein the one or more processors are further conjured to:

conditionally receive a second flag indicating whether weighted prediction is enabled or disabled for a chroma component of the current picture, wherein to conditionally receive the second flag the one or more processors are further configured to receive the second flag in response to at least one of two conditions being true and not receive the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

16. The device of claim 10, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for reference pictures of a first reference picture list, wherein the one or more processors are further conjured to:

conditionally receive a second flag indicating whether weighted prediction is enabled or disabled for reference pictures of a second reference picture list, wherein to conditionally receive the second flag the one or more processors are further configured to receive the second flag in response to at least one of two conditions being true and not receiving the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

17. The device of claim 10, wherein the device comprises a wireless communication device, further comprising a receiver configured to receive an encoded bitstream, comprising the multi-layer video data.

18. The device of claim 17, wherein the wireless communication device comprises a telephone handset and wherein the receiver is configured to demodulate, according to a wireless communication standard, a signal comprising the encoded bitstream.

19. An apparatus for decoding multi-layer video data, the device comprising:

means for determining a picture order count (POC) value for a current picture of the multi-layer video data;

means for determining a POC value for a reference picture of the current picture;

means for determining a layer identification (ID) value for the current picture;

means for determining a layer ID value for the reference picture;

means for conditionally receiving a flag indicating whether weighted prediction is enabled or disabled, wherein the means for conditionally receiving the flag comprises means for receiving the flag in response to at least one of two conditions being true and means for not receiving the flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture; and

means for decoding a block of the multi-layer video data of the current picture based on a determination of whether weighted prediction is enabled or disabled.

20. The apparatus of claim 19, further comprising:

means for receiving one or more weighted prediction parameters in response to receiving the flag and the flag indicating weighted prediction is enabled; and

means for predicting a block of the current picture using a weighted prediction process.

21. The apparatus of claim 19, further comprising:

means for decoding the current picture without receiving one or more weighted prediction parameters in response to receiving the flag and the flag indicating weighted prediction is disabled.

22. The apparatus of claim 19, further comprising:

means for decoding the current picture without receiving one or more weighted prediction parameters in response to not receiving the flag as a result of the two conditions being false.

23. The apparatus of claim 19, wherein a first value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for a luma component of the current picture are present and a second value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for the luma component of the current picture are not present.

24. The apparatus of claim 19, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for a luma component of the current picture, the apparatus further comprising:

means for conditionally receiving a second flag indicating whether weighted prediction is enabled or disabled for a chroma component of the current picture, wherein the means for conditionally receiving the second flag comprises means for receiving the second flag in response to at least one of two conditions being true and means for not receiving the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

25. The apparatus of claim 19, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for reference pictures of a first reference picture list, the apparatus further comprising:

means for conditionally receiving a second flag indicating whether weighted prediction is enabled or disabled for reference pictures of a second reference picture list, wherein the means for conditionally receiving the second flag comprises means for receiving the second flag in response to at least one of two conditions being true and means for not receiving the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

26. A computer readable storage medium storing instructions that when executed by one or more processors cause the one or more processors to:

determine a picture order count (POC) value for a current picture of the multi-layer video data;

determine a POC value for a reference picture of the current picture;

determine a layer identification (ID) value for the current picture;

determine a layer ID value for the reference picture;

conditionally receive a flag indicating whether weighted prediction is enabled or disabled, wherein to conditionally receive the flag the instructions cause the one or more processors to receive the flag in response to at least one of two conditions being true and not receive the flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture; and

decode a block of the multi-layer video data of the current picture based on a determination of whether weighted prediction is enabled or disabled.

27. The computer readable storage medium of claim 26, storing further instructions that when executed by the one or more processors cause the one or more processors to:

in response to receiving the flag and the flag indicating weighted prediction is enabled, receive one or more weighted prediction parameters; and

predict a block of the current picture using a weighted prediction process.

28. The computer readable storage medium of claim 26, storing further instructions that when executed by the one or more processors cause the one or more processors to:

in response to receiving the flag and the flag indicating weighted prediction is disabled, decode the current picture without receiving one or more weighted prediction parameters.

29. The computer readable storage medium of claim 26, further comprising:

in response to not receiving the flag as a result of the two conditions being false, decode the current picture without receiving one or more weighted prediction parameters.

30. The computer readable storage medium of claim 26, wherein a first value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for a luma component of the current picture are present and a second value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for the luma component of the current picture are not present.

31. The computer readable storage medium of claim 26, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for a luma component of the current picture, the computer readable medium storing further instructions that when executed by the one or more processors cause the one or more processors to:

conditionally receive a second flag indicating whether weighted prediction is enabled or disabled for a chroma component of the current picture, wherein to conditionally receive the second flag the instructions cause the one or more processors to receive the second flag in response to at least one of two conditions being true and not receive the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

32. The computer readable storage medium of claim 26, wherein the flag indicating whether weighted prediction is enabled or disabled comprises a first flag, and wherein the first flag indicates whether weighted prediction is enabled or disabled for reference pictures of a first reference picture list, the computer readable medium storing further instructions that when executed by the one or more processors cause the one or more processors to:

conditionally receive a second flag indicating whether weighted prediction is enabled or disabled for reference pictures of a second reference picture list, wherein to conditionally receive the second flag the instructions cause the one or more processors to receive the second flag in response to at least one of two conditions being true and not receive the second flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture.

33. A method of encoding multi-layer video data, the method comprising:

determining a picture order count (POC) value for a current picture of the multi-layer video data;

determining a POC value for a reference picture of the current picture;

determining a layer identification (ID) value for the current picture;

determining a layer ID value for the reference picture;

conditionally generating, for inclusion in an encoded bitstream of the multi-layer video data, a flag indicating whether weighted prediction is enabled or disabled, wherein conditionally generating the flag comprises generating the flag in response to at least one of two conditions being true and not generating the flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture; and

outputting the encoded bitstream of multi-layer video data.

34. The method of claim 33, further comprising:

in response to generating the flag and the flag indicating weighted prediction is enabled, generating one or more weighted prediction parameters for inclusion in the encoded bitstream of multi-layer video data.

35. The method of claim 33, further comprising:

in response to not generating the flag as a result of the two conditions being false, generating the encoded video bitstream of multi-layer video data for the current picture without including one or more weighted prediction parameters.

36. The method of claim 33, wherein a first value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for a luma component of the current picture are present in the encoded bitstream of multi-layer video data and a second value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for the luma component of the current picture are not present in the encoded bitstream of multi-layer video data.

37. The method of claim 33, further comprising:

storing the multi-layer video data in a memory of a wireless communication device;

processing the multi-layer video data on one or more processors of the wireless communication device; and

transmitting an encoded bitstream comprising the multi-layer video data from a transmitter of the wireless communication device;

38. The method of claim 37, wherein the wireless communication device comprises a telephone handset and wherein transmitting the encoded bitstream at the transmitter of the wireless communication device comprises modulating, according to a wireless communication standard, a signal comprising the encoded bitstream.

39. A device for encoding video data, the device comprising:

a memory configured to store multi-layer video data;

one or more processors configured to;

determine a picture order count (POC) value for a current picture of the multi-layer video data;

determine a POC value for a reference picture of the current picture;

determine a layer identification (ID) value for the current picture;

determine a layer ID value for the reference picture;

conditionally generate, for inclusion in an encoded bitstream of the multi-layer video data, a flag indicating whether weighted prediction is enabled or disabled, wherein to conditionally generate the flag the one or more processors are configured to generate the flag in response to at least one of two conditions being true and not generate the flag in response to the two conditions being false, the two conditions being (1) the POC value of the current picture is not equal to the POC value of the reference picture, and (2) the layer ID value for the current picture is not equal to the layer ID value for the reference picture; and

output the encoded bitstream of multi-layer video data.

40. The device of claim 39, wherein the one or more processors are further configured to:

in response to generating the flag and the flag indicating weighted prediction is enabled, generate one or more weighted prediction parameters for inclusion in the encoded bitstream of multi-layer video data.

41. The device of claim 39, wherein the one or more processors are further configured to:

in response to not generating the flag as a result of the two conditions being false, generate the encoded video bitstream of multi-layer video data for the current picture without including one or more weighted prediction parameters.

42. The device of claim 39, wherein a first value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for a luma component of the current picture are present in the encoded bitstream of multi-layer video data and a second value for the flag indicating whether weighted prediction is enabled or disabled indicates weighting factors for the luma component of the current picture are not present in the encoded bitstream of multi-layer video data.

43. The device of claim 39, wherein the device comprises a wireless communication device, further comprising a transmitter configured to transmit an encoded bitstream comprising the multi-layer video data.

44. The device of claim 43, wherein the wireless communication device comprises a telephone handset and wherein the transmitter is configured to modulate, according to a wireless communication standard, a signal comprising the encoded bitstream.