METHODS AND APPARATUS FOR ARTIFACT REMOVAL FOR BIT DEPTH SCALABILITY

• US 20100220796A1
• Filed: 10/14/2008
• Published: 09/02/2010
• Est. Priority Date: 10/16/2007
• Status: Active Grant

• Current Assignee: InterDigital Madison Patent Holdings (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Gao, Yong Ying, Wu, Yu Wen, Luo, Jiancong, Yin, Peng
• Granted Patent: US 8,369,422 B2
• Time in Patent Office: Days
• US Class Current: 375/240.290
• CPC Class Codes: H04N 19/134 characterised by the element, parameter or criterion affecting or controlling the adaptive coding
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• 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 19/30 using hierarchical techniques, e.g. scalability H04N19/63 takes precedence
• CPC Class Codes: H04N 19/36 Scalability techniques involving formatting the layers as a function of picture distortion after decoding, e.g. signal-to-noise [SNR] scalability
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• 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
• CPC Class Codes: H04N 19/82 involving filtering within a prediction loop
• CPC Class Codes: H04N 19/86 involving reduction of coding artifacts, e.g. of blockiness

Abstract

There are provided methods and apparatus for artifact removal for bit depth scalability. The method and apparatus utilize an encoder for encoding an enhancement layer for at least a portion of a picture. A deblocking filter is applied at the enhancement layer for bit depth scalability. A decoding method and apparatus are described for decoding an enhancement layer for at least a portion of a picture, wherein the during the decoding process, a deblocking filter is applied at the enhancement layer for bit depth scalability. Furthermore, an encoder and method are described for encoding image data for at least one block of a picture, wherein a deblocking filter removes coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability. A decoding method and apparatus are described for decoding image data for at least one block of a picture, wherein a deblocking filter removes coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability.

Claims

1. An apparatus, comprising:

an encoder for encoding image data for at least one block of a picture, wherein a deblocking filter removes coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability.

2. The apparatus of claim 1, wherein the local inverse tone mapping is block-based, and a block size of the block-based local inverse tone mapping is capable of being a macroblock.

3. The apparatus of claim 2, wherein a boundary strength of the deblocking filter is adjusted based on a threshold that, in turn, is based on a difference of inverse tone mapping parameters for the at least one block and at least one adjacent block with respect to the at least one block.

4. The apparatus of claim 1, wherein a boundary strength of the deblocking filter is adjusted when macroblock-based inverse tone mapping is used for at least one adjacent block with respect to the at least one block.

5. The apparatus of claim 1, wherein a boundary strength of the deblocking filter is adjusted when inverse tone mapping parameters are different for the at least one block and at least one adjacent block with respect to the at least one block.

6. A method, comprising:

encoding image data for at least one block of a picture, wherein said encoding step comprising applying deblocking filtering to remove coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability.

7. The method of claim 6, wherein the local inverse tone mapping is block-based, and a block size of the block-based local inverse tone mapping is capable of being a macroblock.

8. The method of claim 7, wherein a boundary strength of the deblocking filtering is adjusted based on a threshold that, in turn, is based on a difference of inverse tone mapping parameters for the at least one block and at least one adjacent block with respect to the at least one block.

9. The method of claim 6, wherein a boundary strength of the deblocking filtering is adjusted when macroblock-based inverse tone mapping is used for at least one adjacent block with respect to the at least one block.

10. The method of claim 6, wherein a boundary strength of the deblocking filtering is adjusted when inverse tone mapping parameters are different for the at least one block and at least one adjacent block with respect to the at least one block.

11. An apparatus, comprising:

a decoder for decoding image data for at least one block of a picture, wherein a deblocking filter removes coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability.

12. The apparatus of claim 11, wherein the local inverse tone mapping is block-based, and a block size of the block-based local inverse tone mapping is capable of being a macroblock.

13. The apparatus of claim 12, wherein a boundary strength of the deblocking filter is adjusted based on a threshold that, in turn, is based on a difference of inverse tone mapping parameters for the at least one block and at least one adjacent block with respect to the at least one block.

14. The apparatus of claim 11, wherein a boundary strength of the deblocking filter is adjusted when macroblock-based inverse tone mapping is used for at least one adjacent block with respect to the at least one block.

15. The apparatus of claim 11, wherein a boundary strength of the deblocking filter is adjusted when inverse tone mapping parameters are different for the at least one block and at least one adjacent block with respect to the at least one block.

16. The apparatus of claim 11, wherein the deblocking filter is applied inside the motion compensation loop or outside the motion compensation loop.

17. A method, comprising:

decoding image data for at least one block of a picture, wherein said decoding step comprises applying deblocking filtering to remove coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability.

18. The method of claim 17, wherein the local inverse tone mapping is block-based, and a block size of the block-based local inverse tone mapping is capable of being a macroblock.

19. The method of claim 18, wherein a boundary strength of the deblocking filtering is adjusted based on a threshold that, in turn, is based on a difference of inverse tone mapping parameters for the at least one block and at least one adjacent block with respect to the at least one block.

20. The method of claim 17, wherein a boundary strength of the deblocking filtering is adjusted when macroblock-based inverse tone mapping is used for at least one adjacent block with respect to the at least one block.

21. The method of claim 17, wherein a boundary strength of the deblocking filtering is adjusted when inverse tone mapping parameters are different for the at least one block and at least one adjacent block with respect to the at least one block.

22. The method of claim 17, wherein the deblocking filter is applied inside the motion compensation loop or outside the motion compensation loop.

23. A computer-readable storage media having video signal data encoded thereupon, comprising:

image data encoded for at least one block of a picture, wherein the image data is deblocking filtered to remove coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability.

24. A video signal structure for video encoding, decoding, and transport and having video signal data encoded thereupon, comprising:

image data encoded for at least one block of a picture, wherein the image data is deblocking filtered to remove coding artifacts caused by local inverse tone mapping for intra-layer texture prediction for bit depth scalability.