METHOD, APPARATUS AND SYSTEM FOR PROVIDING COLOR GRADING FOR DISPLAYS

• US 20100265264A1
• Filed: 12/21/2006
• Published: 10/21/2010
• Est. Priority Date: 12/21/2006
• Status: Active Grant

• Current Assignee: InterDigital Madison Patent Holdings (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Zwing, Rainer, Lee, Bongsun, Stauder, Jurgen, Ollivier, Pierre Jean, Sterling, Michael Allan, Doser, Ingo Tobias, Correa, Carlos, Gu, Xueming Henry
• Granted Patent: US 9,654,751 B2
• Time in Patent Office: Days
• US Class Current: 345/590
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/346 for systems having a bit-mapped display memory
• CPC Class Codes: H04N 1/6052 Matching two or more picture signal generators or two or more picture reproducers
• CPC Class Codes: H04N 1/6058 Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
• CPC Class Codes: H04N 1/6088 by viewing conditions, i.e. conditions at picture output
• CPC Class Codes: H04N 21/23439 for generating different versions
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

A method, apparatus and system for providing color grading or color correction for displays includes a plurality of virtual device models where each virtual device model has a virtual model specification (VMS) which controls a display feature. Each display includes a display specification including a display requirement or requirements. An apparatus of the present invention is configured to compare the display feature of at least one VMS against the display requirement of the display specification to determine a best match therebetween to select a virtual device model to control a display picture. Color correction is further provided in post production using the VMS to provide consistency across multiple display types.

Claims

1. A system for adjusting display picture, comprising:

a plurality of virtual device models, each virtual device model having at least one virtual model specification (VMS) which controls a display feature;

a display including a display specification including at least one display requirement; and

a picture selector configured to compare the display feature of at least one VMS against the display requirement of the display specification to determine a best match therebetween to select a virtual device model to control a display picture.

2. The system as recited in claim 1, wherein the picture selector is integrated in the display.

3. The system as recited in claim 1, wherein the picture selector is a stand-alone device.

4. The system as recited in claim 1, wherein the picture selector is integrated in a picture source device.

5. The system as recited in claim 1, wherein the display features include at least one of:

display brightness, display color gamut, surround brightness, contrast ratio, color accuracy, color gamut, electrical-optical transfer function (gamma), average picture level dependent luminance transfer function, dithering level, picture size and viewing distance, motion behavior, and spatial resolution.

6. The system as recited in claim 1, wherein the picture selector includes a decision matrix configured to score each display feature to each display requirement to select the virtual device model to control the display picture.

7. The system as recited in claim 6, wherein the decision matrix includes weights to provide a level of importance for each display requirement.

8. The system as recited in claim 1, wherein the plurality of virtual device models is configured to cover a plurality of display types.

9. The system as recited in claim 1, wherein each of the plurality of virtual device models is configured to cover a plurality of display types and conditions.

10. The system as recited in claim 1, further comprising a special virtual device model configured to cover a selected display to provide a given consistency on the display.

11. A method for adjusting a display picture, comprising:

receiving virtual device models;

comparing the virtual device models to display requirements for a particular display to select a best virtual device model based on a score; and

rendering a display picture in accordance with the best virtual device model.

12. The method as recited in claim 11, wherein comparing includes generating a decision matrix to determine the score.

13. The method as recited in claim 12, wherein generating includes weighting features of the display requirements to provide a weighted score.

14. The method as recited in claim 11, further comprising generating a plurality of virtual device models by calibrating a plurality of display types under a plurality of conditions.

15. The method as recited in claim 11, further comprising generating the virtual device models to cover a plurality of display types and conditions.

16. The method as recited in claim 11, further comprising generating one virtual device model to cover a plurality of display types and conditions.

17. The method as recited in claim 11, further comprising generating a special virtual device model to cover a special display condition and provide a given effect on a display.

18. A method for color correction, comprising:

representing a display or a class of displays on which content is to be displayed by generating at least one virtual device model for color correction;

adjusting the at least one virtual device model for color correction for the display or the class of displays by emulating representative displays for proof viewing of one of a display effect and a color decision; and

storing the virtual device models in accordance with the display effect or color decision.

19. The method as recited in claim 18, further comprising employing a warning tool to check differences between an image rendered on a first representative display type versus a second representative display type.

20. The method as recited in claim 18, wherein the at least one virtual device model includes at least one of:

display brightness, display color gamut, surround brightness, contrast ratio, color accuracy, color gamut, electrical-optical transfer function (gamma), average picture level dependent luminance transfer function, dithering level, picture size and viewing distance, motion behavior, spatial resolution, hue and saturation.

21. The method as recited in claim 18, wherein adjusting includes adjusting the at least one virtual device model to provide one of the display effect and color decision consistently on a plurality of display types and conditions.

22. The method as recited in claim 18, wherein adjusting includes generating a special virtual device model to cover a special display condition and provide a given effect on a display.

23. The method as recited in claim 18, wherein adjusting includes making several versions of a feature, and color correcting each version in accordance with individual virtual device models to be made available for consumer viewing on a plurality of displays and conditions.

24. A display unit, comprising:

a display including a display specification including at least one display requirement;

a picture selector configured to compare at least one virtual model specification (VMS) against the at least one display requirement of the display specification to determine a best match therebetween to select a virtual device model to control a display picture.

25. The display unit as recited in claim 24, wherein the display specification includes requirements for at least one of:

display brightness, display color gamut, surround brightness, contrast ratio, color accuracy, color gamut, electrical-optical transfer function (gamma), average picture level dependent luminance transfer function, dithering level, picture size and viewing distance, motion behavior, and spatial resolution.

26. The display unit as recited in claim 25, wherein the picture selector includes a decision matrix configured to score each display feature of the VMS to each display requirement to select the virtual device model to control the display picture.

27. The display unit as recited in claim 26, wherein the decision matrix includes weights to provide a level of importance for each display requirement.

28. The display unit as recited in claim 24, wherein each virtual device model is configured to cover a plurality of display types and conditions.