Methods and apparatus for video coding and decoding with reduced bit-depth update mode and reduced chroma sampling update mode

Patent metadata

Field	Value
Publication number	US-9510016-B2
Application number	US-73713209-A
Country	US
Kind code	B2
Filing date	Jun 11, 2009
Priority date	Jun 12, 2008
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

Methods and apparatus are provided for video coding and decoding with reduced bit-depth update mode and reduced chroma sampling update mode. An apparatus includes an encoder for encoding at least a portion of a picture using at least one of a reduced bit-depth update mode and a reduced chroma sampling update mode that respectively reduces at least one of a bit-depth and a chroma sampling of a residue signal corresponding to the portion.

First claim

The invention claimed is:

1. An apparatus for video encoding, comprising:
an encoder for encoding at least a portion of a picture in video encoding that provide a single bitstream for the picture, wherein the encoder, if the picture is a predesignated reference picture, encodes the portion using at least one of a full bit-depth and a full chroma sampling, and if the picture is not the reference picture, encodes the portion using at least one of a reduced bit-depth update mode and a reduced chroma sampling update mode that respectively reduces at least one of a bit-depth and a chroma sampling of a residue signal corresponding to the portion,
wherein at least one of intra prediction and motion compensation are performed for the portion using at least one of a full bit-depth and a full chroma-sampling and wherein the portion is reconstructed by increasing the at least one of the bit-depth and the chroma sampling of the residue signal.

2. The apparatus of claim 1 , wherein said encoder signals parameters for at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode to a corresponding decoder at least one of a macroblock level, a slice level, a picture level, and a sequence level.

3. The apparatus of claim 2 , wherein the signaled parameters are associated with at least one of the reference picture and a reference picture list.

4. The apparatus of claim 1 , wherein at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode is enabled based on at least one of a coded picture type and picture characteristics.

5. A method for video encoding, comprising:
encoding at least a portion of a picture in video encoding that provide a single bitstream for the picture, wherein if the picture is a predesignated reference picture, the portion is encoded using at least one of a full bit-depth and a full chroma sampling, and if the picture is not the reference picture, the portion is encoded using at least one of a reduced bit-depth update mode and a reduced chroma sampling update mode that respectively reduces at least one of a bit-depth and a chroma sampling of a residue signal corresponding to the portion,
wherein at least one of intra prediction and motion compensation are performed for the portion using at least one of the full bit-depth and the full chroma-sampling and wherein the portion is reconstructed by increasing the at least one of the bit-depth and the chroma sampling of the residue signal.

6. The method of claim 5 , wherein said encoding step comprises signaling parameters for at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode to a corresponding decoder at least one of a macroblock level, a slice level, a picture level, and a sequence level.

7. The method of claim 6 , wherein the signaled parameters are associated with at least one of the reference picture and a reference picture list.

8. The method of claim 5 , wherein at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode is enabled based on at least one of a coded picture type and picture characteristics.

9. An apparatus for video decoding, comprising:
a decoder for decoding at least a portion of a picture from a single bitstream compressed using a video compression scheme that provides only the single bitstream for the picture, wherein the decoder, if the picture is a predesignated reference picture, decodes the portion using at least one of a full bit-depth and a full chroma sampling, and if the picture is not the reference picture, decodes the portion using at least one of a reduced bit-depth update mode and a reduced chroma sampling update mode that respectively increases at least one of a bit-depth and a chroma sampling of a residue signal corresponding to the portion,
wherein at least one of intra prediction and motion compensation are performed for the portion using at least one of the full bit-depth and the full chroma-sampling and wherein the portion reconstructed by increasing the at least one of the bit-depth and the chroma sampling of the residue signal.

10. The apparatus of claim 9 , wherein said decoder at least one of decodes and derives parameters for at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode from at least one of a macroblock level, a slice level, a picture level, and a sequence level.

11. The apparatus of claim 10 , wherein the parameters are associated with at least one a reference picture and a reference picture list.

12. The apparatus of claim 9 , wherein at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode is enabled based on at least one of a coded picture type and picture characteristics.

13. A method for video decoding, comprising:
decoding at least a portion of a picture from a single bitstream compressed using a video compression scheme that provides only the single bitstream for the picture, wherein if the picture is a predesignated reference picture, the portion is decoded using at least one of a full bit-depth and a full chroma sampling, and if the picture is not the reference picture, the portion is decoded using at least one of a reduced bit-depth update mode and a reduced chroma sampling update mode that respectively increases at least one of a bit-depth and a chroma sampling of a residue signal corresponding to the portion,
wherein at least one of intra prediction and motion compensation are performed for the portion using at least one of the full bit-depth and the full chroma-sampling and wherein the portion reconstructed by increasing the at least one of the bit-depth and the chroma sampling of the residue signal.

14. The method of claim 13 , wherein said decoding step comprises at least one of decoding and deriving parameters for at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode from at least one of a macroblock level, a slice level, a picture level, and a sequence level.

15. The method of claim 14 , wherein the parameters are associated with at least one a reference picture and a reference picture list.

16. The method of claim 13 , wherein at least one of the reduced bit-depth update mode and the reduced chroma sampling update mode is enabled based on at least one of a coded picture type and picture characteristics.

Assignees

• Gomila Cristina
• Divorra Escoda Oscar
• Yin Peng
• Sole Joel
• Thomson Licensing

Inventors

• Gomila Cristina
• Divorra Escoda Oscar
• Yin Peng
• Sole Joel

Classifications

• H04N19/59 Primary

  involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution · CPC title

• H04N19/61

  in combination with predictive coding · CPC title

• H04N19/186 Primary

  the unit being a colour or a chrominance component · CPC title

• H04N19/157

  Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter · CPC title

• H04N19/184

  the unit being bits, e.g. of the compressed video stream · CPC title