Methods and systems for tone mapping messaging

• US 8,194,997 B2
• Filed: 12/04/2006
• Issued: 06/05/2012
• Est. Priority Date: 03/24/2006
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Segall, Christopher A., Kerofsky, Louis Joseph, Lei, Shawmin
• Primary Examiner(s): Bhatnagar, Anand
• Assistant Examiner(s): BLOOM, NATHAN J
• Application Number:
  US11/566,657
• Publication Number:
  US 20070223813A1
• Time in Patent Office: 2,010 Days
• Field of Search: 382128-132, 382/254, 382/274, 382/276, 382/305, 382/232, 707/201, 707/602, 358/1.9, 358/1.13, 358/3.27, 358/516, 345/112, 345/131, 345/139, 345/147, 345/439, 345/432, 345/581, 345/601, 345/589, 345/582, 703/3, 348/223.1, 348/390.1, 348/425.1, 348/441
• US Class Current: 382/274
• CPC Class Codes: H04N 1/6027 Correction or control of colour gradation or colour contrast H04N1/6058 takes precedence

Abstract

Embodiments of the present invention comprise methods and systems for signaling tone map data to an image recipient.

Claims

1. A system for converting a video from a first dynamic range to a second dynamic range, said system comprising:

a. a receiver for receiving said video and for receiving a message, wherein said message comprises;

i) a plurality of tone maps, each for use in converting said video from said first dynamic range to said second dynamic range, said first dynamic range and said second dynamic range each represented by respectively different bit-depths, wherein each of said tone maps is defined by a model identifier (ID) and at least one model parameter, and each of said tone maps is associated with a tone map ID, which identifies the purpose of the associated tone map, where said plurality of tone maps includes at least two types selected from the group of;

(1) linear mapping with clipping;

(2) a sigmoidal model;

(3) a user-defined look-up table; and

(4) a piecewise linear model;

b. a selector for selecting a first tone map, from said plurality of tone maps, to apply to said video; and

c. a tone map processor for applying said first tone map to said video, thereby producing a tone-mapped video.

2. A system as described in claim 1, wherein said plurality of tone maps comprises a linear map with clipping, a sigmoidal map, a user-defined lookup table map, and a piecewise linear map.

3. A system as described in claim 1 further comprising a transmitter for transmitting said tone-mapped video.

4. A system as described in claim 1, wherein said message is a Supplemental Enhancement Information (SEI) message.

5. A system as described in claim 1, wherein said message further comprises a tone map cancel flag for canceling the persistence of a previous tone map message.

6. A system as described in claim 1, wherein said message further comprises a tone map repetition period message.

7. A system as described in claim 1, wherein said message allows said selector to select said first tone map so that said first tone map corresponds to a recipient device dynamic range.

8. A system as described in claim 1, wherein said selector selects said first tone map according to at least one recipient preference.

9. A method for converting a video from a first dynamic range to a second dynamic range, said method comprising:

a. receiving a message and a video at a receiver, wherein said message comprises more than one tone map model identifier (ID), wherein each of said more than one tone map model ID is associated with a respectively different tone map, and said message further comprises, for each of said more than one tone map model ID, at least one model parameter for said associated tone map;

b. determining a first tone map to apply to said video having said first dynamic range from said more than one tone map model ID, wherein said first tone map maps said first dynamic range to said second dynamic range, said first dynamic range and said second dynamic range each represented by respectively different bit-depths;

c. constructing said first tone map using said at least one model parameter associated with said first tone map; and

d. applying said first tone map to said video, thereby producing a video with said second dynamic range.

10. A method as described in claim 9, wherein said second dynamic range corresponds to a recipient device dynamic range.

11. A method as described in claim 9, wherein said message allows said determining to be based on recipient preferences.

12. A method as described in claim 9, wherein said message is a Supplemental Enhancement Information (SEI) message.

13. A method as described in claim 9, wherein each of said more than one tone map ID identifies a dynamic range for said tone map.

14. A method as described in claim 9, wherein said tone map represented by the selected said more than one tone map model ID is a tone map selected from the group consisting of a linear map with clipping, a sigmoidal map, a user-defined lookup table map, and a piecewise linear map.

15. A method as described in claim 9, wherein said message further comprises a tone map cancel flag for canceling the persistence of a previous tone map message.

16. A method as described in claim 9, wherein said message further comprises a tone map repetition period message.

17. A method as described in claim 9 further comprising receiving a bitstream, wherein said bitstream comprises said video with said first dynamic range.

18. A method as described in claim 17, wherein said bitstream further comprises said message.

19. A method as described in claim 9 further comprising transmitting said video with said second dynamic range.

20. A method as described in claim 17 further comprising transmitting said video with said second dynamic range.

21. A method for signaling tone map data from a video encoder to a video recipient, said method comprising:

a. establishing more than one tone map, each for use in converting said a video from a first dynamic range to a second dynamic range, said first dynamic range and said second dynamic range each represented by respectively different bit-depths;

b. representing each of said more than one tone map with a model identifier (ID) and at least one model parameter; and

c. sending a video and a message to a receiver, wherein said message comprises said tone map model ID and said at least one model parameter associated with said tone map model ID, wherein said recipient may use said tone map model ID and said at least one model parameter to identify a said tone map to apply to said video.

22. A method as described in claim 21 wherein said message is a Supplemental Enhancement Information (SEI) message.

23. A method as described in claim 21 wherein said at least one tone map comprises a linear map with clipping, a sigmoidal map, a user-defined lookup table map and a piecewise linear map.

24. A method as described in claim 21 further comprising a tone map ID for each of said at least one tone maps, wherein said tone map ID identifies a dynamic range for its associated tone map.

25. A method as described in claim 21 wherein said message is transmitted outside the bitstream in which said video is transmitted.

26. A method as described in claim 21 wherein said message further comprises a tone map cancel flag for canceling the persistence of a previous tone map message.

27. A method as described in claim 21 wherein said message further comprises a tone map repetition period message.

28. A method as described in claim 21, wherein said message allows said recipient to select one of said plurality of tone maps that corresponds to a recipient device dynamic range.

29. A method as described in claim 21, wherein said message allows said recipient to select one of said plurality of tone maps that corresponds to at least one recipient preference.