Color reproduction apparatus having plural color reproduction ranges and a color signal-processing method therefor

• US 20060285136A1
• Filed: 03/13/2006
• Published: 12/21/2006
• Est. Priority Date: 06/21/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shin, Yoon-cheol, Choi, Dong-bum
• Granted Patent: US 8,379,038 B2
• Time in Patent Office: Days
• US Class Current: 358/1.900
• 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 5/06 using colour palettes, e.g. look-up tables
• 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 17/02 for colour television signals
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

A color-processing method includes: selecting a target color gamut to produce an input color signal; calculating a mixture ratio enabling primary colors of the target color gamut to be created by mixing primary colors of a color gamut of the color reproduction apparatus to reproduce the input color signal therewith; producing primary colors reconfigured by mixing the primary colors of the color gamut of the color reproduction apparatus according to the calculated mixture ratio; adjusting an illuminant to match an output signal to a color gamut determined by the reconfigured primary colors; and converting the input color signal to match to the primary colors determined by the reconfigured primary colors. Further a user can arbitrarily set a color gamut in a range that a color reproduction apparatus can reproduce regardless of an input color signal without a quantization errors.

Claims

1. A color reproduction apparatus having plural color reproduction ranges, the apparatus comprising:

a selection unit which selects a target color gamut to reproduce an input color signal therein;

a calculation unit which calculates a mixture ratio enabling primary colors of the target color gamut to be created by mixing primary colors of a color gamut of the color reproduction apparatus to produce the input color signal therewith;

a primary color determination unit which produces primary colors reconfigured by mixing the primary colors of the color gamut of the color reproduction apparatus according to the calculated mixture ratio;

a driving unit which adjusts a light amount of an illuminant in order to match the input color signal toan output signal with a color gamut determined by the reconfigured primary colors; and

a display unit which displays the output signal converted from the input signal and matched to the color gamut determined by the reconfigured primary colors.

2. The apparatus as claimed in claim 1, further comprising:

a color-coordinate conversion unit which converts a color coordinate of an input color signal into color coordinate values of a device-independent CIE-XYZ color space, and which provides the converted color coordinate values as the input color signal.

3. The apparatus as claimed in claim 1, wherein the target color gamut is one of a color gamut reproducing an NTSC broadcasting specification, PAL broadcasting specification, an SMPTE-C broadcasting specification, a color gamut reproducing standard color signals of sRGB specification and RGB specification, a color gamut for light emitting diode (LED) display device, and a color gamut set up by a user of the color reproduction apparatus.

4. The apparatus as claimed in claim 1, further comprising:

a storage unit which stores color coordinates of the target color gamut and color coordinates of the primary colors of the color gamut of the color reproducing apparatus.

5. The apparatus as claimed in claim 4, wherein the storage unit stores in a form of a lookup table, the mixture ratio enabling the primary colors of the target color gamut to be produced by mixing the primary colors of the color gamut of the color reproduction apparatus according to the target color gamut that can be selected by the selection unit.

6. The apparatus as claimed in claim 1, wherein the driving unit adjusts the light amount of the illuminant by using a Pulse Width Modulation (PWM) method or an Amplitude Modulation (AM) method according to a driving mode of the color reproduction apparatus.

7. A color-processing method, comprising:

selecting a target color gamut to reproduce an input color signal therein;

calculating a mixture ratio enabling primary colors of the target color gamut to be created by mixing primary colors of a color gamut of the color reproduction apparatus to reproduce the input color signal therewith;

producing primary colors reconfigured by mixing the primary colors of the color gamut of the color reproduction apparatus according to the calculated mixture ratio;

adjusting a light amount of an illuminant in order for the input color signal to match an output signal with a color gamut determined by the reconfigured primary colors; and

converting the input color signal to an output signal which matches the primary colors determined by the reconfigured primary colors.

8. The method as claimed in claim 7, further comprising converting a color coordinate of an input color signal into color coordinate values of a device-independent CIE-XYZ color space, and providing the converted color coordinate values as the input color signal.

9. The method as claimed in claim 7, wherein the target color gamut is one of a color gamut reproducing an NTSC broadcasting specification, a PAL broadcasting specification, and an SMPTE-C broadcasting specification, a color gamut reproducing standard color signals of sRGB specification and RGB specification, a color gamut for an LED display device, and a color gamut set up by a user of the color reproduction apparatus.

10. The method as claimed in claim 7, further comprising storing color coordinates of the target color gamut and color coordinates of the primary colors of the color gamut of the color reproduction apparatus.

11. The method as claimed in claim 10, wherein

the target color gamut can be selected by the user, and

wherein the storing comprises storing in the form of a lookup table, the mixture ratio enabling the primary colors of the target color gamut to be created by mixing the primary colors of the color gamut of the color reproducing apparatus according to the target color gamut.

12. The method as claimed in claim 7, wherein theadjustingthe light amount of the illuminant comprises adjusting the light amount of the illuminant by a Pulse Width Modulation (PWM) method or an Amplitude Modulation (AM) method according to a driving mode of the color reproduction apparatus.