Tone mapping for bit-depth scalable video codec

Patent metadata

Field	Value
Publication number	US-9338475-B2
Application number	US-14813108-A
Country	US
Kind code	B2
Filing date	Apr 16, 2008
Priority date	Apr 16, 2008
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A scalable video codec may convert lower bit depth video to higher bit depth video using decoded lower bit depth video for tone mapping and tone mapping derivation. The conversion can also use the filtered lower bit depth video for tone mapping and tone mapping derivation.

First claim

What is claimed is:

1. A method comprising:
using decoded, lower bit depth video for inverse tone mapping for higher bit depth encoding; and
using an analysis of neighboring pixels for inverse tone mapping.

2. The method of claim 1 including increasing the bit depth of encoded baseline layer video information.

3. The method of claim 2 including providing said increased bit depth video information to an enhancement layer encoder.

4. The method of claim 1 including using self-deriving decoding.

5. The method of claim 1 including using a decoded, lower bit depth video for tone mapping derivation.

6. The method of claim 1 including using a decoded output of a baseline layer encoder for inverse tone mapping.

7. The method of claim 1 including using co-located pixels in lower and higher bit depth video for tone mapping derivation.

8. The method of claim 1 including using filtered pixels in lower bit depth video for tone mapping derivation.

9. The method of claim 1 including filtering the decoded, lower bit depth video before inverse tone mapping.

10. The method of claim 1 including developing a tone mapping look-up table with said neighboring pixels and co-located pixels in said lower and higher bit depth video.

11. An apparatus comprising:
a lower bit depth encoder having encoded and decoded video outputs;
a device to increase the bit depth of encoded video information using video from said decoded video output; and
an inverse tone mapper to analyze neighboring pixels.

12. The apparatus of claim 11 wherein said device includes an inverse tone mapper.

13. The apparatus of claim 11 wherein said apparatus is an encoder.

14. The apparatus of claim 11 wherein said apparatus includes a decoder.

15. The apparatus of claim 14 wherein said decoder is self-deriving.

16. The apparatus of claim 11 including a baseline encoder coupled to said device.

17. The apparatus of claim 12 including a filter to filter said decoded video output.

18. The apparatus of claim 17 including an enhancement layer encoder coupled to said filter.

19. The apparatus of claim 18 including an inverse tone mapper and a tone mapper derivation, wherein an output of said filter is coupled to the inverse tone mapper and the tone mapper derivation.

20. A video encoder comprising:
a baseline layer encoder having a decoded output;
an inverse tone mapper to use neighboring pixel analysis coupled to said decoded output; and
an enhancement layer encoder coupled to said inverse tone mapper.

21. The encoder of claim 20 including a tone mapper derivation coupled to said baseline layer encoder, said tone mapper derivation coupled to said inverse tone mapper and to a source of enhancement layer video.

22. The encoder of claim 21 wherein said inverse tone mapper derivation to develop a tone mapper look-up table using pixels in a baseline layer video and an enhancement layer video.

23. The encoder of claim 21 , said inverse tone mapper to use co-located pixels in said baseline layer and said enhancement layer video.

24. The encoder of claim 22 , said inverse tone mapper derivation to develop a tone mapper look-up table using neighboring pixels in said baseline layer video and said enhancement layer video.

25. The encoder of claim 20 including a filter coupled to said decoded output.

26. The encoder of claim 25 wherein said inverse tone mapper is coupled to an output of said filter.

27. The encoder of claim 26 including a tone mapper derivation coupled to the output of said filter.

Assignees

• Chiu Yi-Jen
• Xu Lidong
• Jiang Hong
• Intel Corp

Inventors

• Chiu Yi-Jen
• Xu Lidong
• Jiang Hong

Classifications

• H04N19/44

  Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder · CPC title

• H04N19/182

  the unit being a pixel · CPC title

• H04N19/80 Primary

  Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation (H04N19/635, H04N19/86 take precedence) · CPC title

• H04N19/184

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

• H04N19/187

  the unit being a scalable video layer · CPC title