SYSTEM AND METHOD FOR MATCHING COLORS ON DISPLAYS WITH DIFFERENT MODULATION TRANSFER FUNCTIONS

• US 20100134529A1
• Filed: 06/29/2007
• Published: 06/03/2010
• Est. Priority Date: 06/29/2007
• Status: Abandoned Application

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Correa, Carlos, Doser, Ingo Tobias, Gu, Xueming Henry
• Application Number:
  US12/452,361
• Publication Number:
  US 20100134529A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 9/646 for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Abstract

A system and method for adjusting modulation transfer function includes a color correction module configured to adjust source picture content based upon a reference display to output color corrected picture content. A modulation frequency function (MTF) simulation module is configured to receive the color corrected picture content and simulate the reference display using the color corrected picture content for a display with MTF characteristics different than the reference display.

Claims

1. A method for adjusting a modulation transfer function comprising:

color correcting a source picture content based upon a reference display; and

simulating the reference display by applying a compensated modulation transfer function (MTF) to the color corrected picture content for a display with different MTF characteristics than the reference display.

2. The method of claim 1, further comprising determining MTF settings for a plurality of display types using a single master for the color corrected picture content.

3. The method of claim 1, wherein applying the compensated MTF includes applying an inverse function of an MTF specification for simulating the reference display.

4. The method of claim 1, wherein simulating includes using multiple reference display and comparing images of the multiple reference displays to derive an MTF specification for simulating a display with different MTF behavior.

5. The method of claim 1, wherein the multiple reference displays include a split screen image.

6. The method of claim 1, further comprising generating multiple master copies for the color corrected picture content.

7. The method of claim 6, wherein the multiple master copies for the color corrected picture content include one master generated by the color correcting step and one master generated by the simulating step.

8. The method of claim 1, wherein simulating includes generating metadata based upon color correction settings, the metadata being transmitted to an MTF simulator for content consumers such that the MTF simulator reconstructs MTF characteristics for a given display device.

9. The method of claim 1, further comprising performing a subsequent color correction process where the subsequent color correction process is preceded by a previous color correction process, the previous color correction process providing color corrected picture content for a display with MTF characteristics similar to an additional reference display, and the subsequent color correction process employing the MTF simulation module to provide color corrected picture content for a display with MTF characteristics different than the reference display.

10. The method of claim 9, further comprising color transforming simulation metadata from the step of simulating and color change metadata from the subsequent color correction to manipulate content for a display with different MTF characteristics than the reference display.

11. The method of claim 10, further comprising manipulating an output from the previous color correction process to provide a signal for display.

12. A system for adjusting a modulation transfer function comprising:

a color correction unit configured to adjust source picture content based upon a reference display to output color corrected picture content; and

a compensation unit configured to receive the color corrected picture content and transform the color corrected picture content for a display with modulation transfer function (MTF) characteristics that are different than the reference display.

13. The system of claim 12, further comprising simulation unit coupled to the color correction unit to store color correction metadata used to transform the color corrected picture content by the compensation unit.

14. A system for adjusting a modulation transfer function comprising:

a color correction unit configured to adjust source picture content based upon a reference display to output color corrected picture content; and

a simulation unit configured to receive the color corrected picture content and simulate the reference display using the color corrected picture content for a display with modulation frequency function (MTF) characteristics different than the reference display.

15. The system of claim 14, wherein the simulation unit outputs color corrected picture content to a display with MTF characteristics that are the same as the reference display.

16. The system of claim 14, wherein the simulation unit outputs color corrected picture content to a display with MTF characteristics that are different than the reference display.

17. The system of claim 14, further comprising an additional reference display wherein the reference display and the additional reference display are used to determine MTF settings that are acceptable for both the reference display and the additional reference display.

18. The system of claim 17, wherein the reference display and the additional reference display comprise a single display device having a split screen image.

19. The system of claim 14, wherein the simulation module provides metadata based upon color correction settings, the metadata being transmitted to a simulator for content consumers such that the simulator reconstructs MTF characteristics for a given display device.

20. The system of claim 14, wherein the color correction process unit performs an initial color correction process and a subsequent color correction is subsequently provided, the initial color correction process providing color corrected picture content for a display with MTF characteristics the same as an additional reference display, and the subsequent color correction process employing the simulation unit to provide color corrected picture content for a display with MTF characteristics different than the reference display.

21. The system of claim 20, further comprising a color transform module configured to receive simulation metadata from the simulator unit and color change metadata from the subsequent color correction to manipulate content for a display with different MTF characteristics than the reference display.

22. The system as recited in claim 21, wherein the color transform unit manipulates an output from the previous color correction process to provide a signal for display.

23. The system of claim 21, wherein the color transform unit receives as input a spatial transform specification, and a color transform specification and outputs a color transform to adjust a display image.

24. The system of claim 23, wherein the spatial transform specification includes inverted MTF simulation information, and the spatial transform specification, and the color transform specification include transform coefficients for adjusting frequency bands.

25. The system of claim 24, wherein the coefficients are stored in look up tables.