WO2005062628A1 - 表示デバイスの色表示方式 - Google Patents
表示デバイスの色表示方式 Download PDFInfo
- Publication number
- WO2005062628A1 WO2005062628A1 PCT/JP2004/019312 JP2004019312W WO2005062628A1 WO 2005062628 A1 WO2005062628 A1 WO 2005062628A1 JP 2004019312 W JP2004019312 W JP 2004019312W WO 2005062628 A1 WO2005062628 A1 WO 2005062628A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- color
- display device
- values
- rgb
- value
- Prior art date
Links
- 238000012937 correction Methods 0.000 claims abstract description 14
- 230000009021 linear effect Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 abstract description 6
- 230000005284 excitation Effects 0.000 description 21
- 239000003086 colorant Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 4
- 238000009125 cardiac resynchronization therapy Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
- G09G5/04—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using circuits for interfacing with colour displays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/67—Circuits for processing colour signals for matrixing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Definitions
- the present invention relates to a color display method in a color gamut of a display device, and particularly to a high-accuracy display method.
- RGB color systems and XYZ color systems are well known as color systems.
- actual monochromatic light is used as the primary stimulus, and the actual color is defined by combining those primary stimulus values.
- This color system has the following drawbacks: the ability to represent colors in association with physical coloring substances.
- the present invention converts the input gradation value of the XYZ color system to the RGB color system so that when an image signal of the XYZ color system is input, the distortion error due to nonlinearity or the like is minimized.
- a correction device that includes a system with a high-fidelity color reproduction function that accurately converts image signals into RGB color system image values and outputs RGB color system image signals output from this correction device And a display device for displaying an image.
- the correction device When the number of bits of data to be used is n, the correction device outputs a color signal C (X, ⁇ , Z) that can take an arbitrary gradation value of 0— (2 n ⁇ 1) to the display device.
- Means for converting to an RGB linear value using an XYZ value corresponding to (2 n -1) which is the maximum gradation value of each of RGB, R, R at an operating point d of the display device corresponding to the RGB linear value, G and B ddd are obtained from the measured values, and corresponding (X, Y, Z), (X, Y), (X, Y, Z) rd rd rd gd gd, Zgd bd od bd values are created in advance.
- X aX + bX + cX
- Feedback means for returning the calculation results a, b, and c to execute the calculation by the calculation means again when the determination means determines that the value is out of the range;
- the display device is a CRT, LCD, or Any type of display device, such as a PDP.
- the present invention provides data that changes. Based on this, the display color can be accurately reproduced. Further, according to the present invention, since strict calibration is not required for the display device, there is an effect that display colors can be faithfully reproduced by an extremely simple method. However, measuring equipment for tristimulus values needs to have appropriate accuracy. Furthermore, since the display device may be an LCD, a CRT, or a PDP, the method of the present invention can be applied to all kinds of display devices regardless of the configuration principle, as long as additive color mixing can be realized. The effect is that it can be applied.
- FIG. 1 Measurement showing the relationship between the input values of RGB signals to the display device and the Y stimulus values on the XYZ color system (described as RLinear, Glinear, and BLinear) for each of the RGB tristimulus values. An example.
- FIG. 2 is an explanatory diagram in which the maximum values of stimulus values X, ⁇ , and Z are set to 1 and the relationship between RGB and XYZ is normalized and shown on a log-logarithmic axis.
- FIG. 3 is a flowchart of a system for executing color reproduction of a display color with high fidelity.
- FIG. 4 is a system diagram showing a block configuration of a display device equipped with a high-fidelity color reproduction system.
- FIG. 1 shows a measurement example showing a relationship between an input value of an RGB signal to a display device and a stimulus value on the XYZ color system for each of the three stimulus values of RGB.
- (a) is for R (red)
- (b) is for G (green)
- (c) is for B (blue).
- the n-bit digital excitation voltage (or excitation current) changes in one step from 0— (2 n — 1).
- Table 1 below is an example showing the relationship between the value of the input excitation voltage, the X, ⁇ , Z stimulus values, and the luminance.
- the color (C) is generally calculated using the tristimulus values of the three primary colors R (red), G (green), and B (blue) when the color is displayed, as shown in the following equation (1). expressed.
- X, X, and X are the R, G, and B components of the stimulus value X, and ⁇ , ⁇ , and Y are the respective components.
- R, G, and ⁇ components of the stimulus value Y, and ⁇ , ⁇ , and ⁇ are the R, G, and ⁇ components of the stimulus value ⁇ ⁇ ⁇ ⁇ , respectively.
- the chromaticity of a primary color changes according to the gradation of an excitation value such as an excitation voltage or an excitation current, but the gradation of the excitation value ranges from 0 to (2 n -1).
- R, G, and B represent the ratio of the luminance of the primary colors when the color C is displayed, and are analog values between 0 and 1, respectively.
- this is also referred to as a linear value.
- equation (2) in matrix form gives the following equation (3) c
- the chromaticity changes in the halftone gradation reproduction characteristics for each of the red, green, blue, and three primary colors.
- the ratio of the tristimulus values does not change even if the display device is ideally linear and the excitation gradation values are different, the color tristimulus obtained by adding these three tristimulus values is used.
- the intense value should have a ratio that matches the tristimulus value of color C shown in equation (1).
- the sum of the tristimulus values of the respective gradation values determined in this manner is different from the calculated color C and the actual color C. They do not match, and the tristimulus values at this time do not match those calculated.
- equation (6) is expressed in matrix form, the following equations (7) and (8) are obtained.
- Equation (7) is a relational expression for obtaining X, Y, and Z using the tristimulus values of the display device closer to the respective tristimulus values for the three primary colors when displaying color C.
- the coefficients a, b, and c represent the luminance ratio of the R, G, and B primary colors at that time, they can be considered as modified linears (Ra, Gb, Be).
- the halftone reproducibility characteristic is determined by the relationship of the following equation (9) with respect to the gradation value that the display device can take for each.
- the tristimulus values for each of the three primary colors when the color C thus obtained is displayed are (Xrd, Yrd, Zrd,), (Xgd, Ygd, Zgd,), (Xbd, Ybd, Zbd,)
- the sum of the tristimulus values thus obtained is closer to the actual tristimulus value of the color C than the sum of the tristimulus values obtained assuming a linear relationship.
- FIG. 3 is a diagram showing an operation flowchart of a system for executing color reproduction of display colors with high fidelity according to the above-described method.
- the color C (X, Y, Z) signal is converted to the RGB display system using the X, ⁇ , and Z of each of the three primary colors when the maximum gradation value of the display device is (2 n — 1), Find the value of the RGB display system at this time. Therefore, the values of (Xrd, Yrd, Zrd), (Xgd, Ygd, Zgd), and (Xbd, Ybd, Zbd) corresponding to these are obtained, and using these values, X, ⁇ , Calculate Z. Using the obtained X, ⁇ , and Z again, repeat the above calculation until a, b, and c are all close to 1 and have been determined to be a force.
- FIG. 4 shows an example in which an image signal having display values of X, ⁇ ⁇ , and Z is input, and after passing through the system having the high-fidelity color reproduction function described above, the display values of R, G, and B are changed. Display the image signal
- FIG. 2 is a system diagram of an image display showing a block configuration of a display device to be displayed.
- 1 is a correction device including a system having a high-fidelity color reproduction function
- 2 is a display device.
- the correction device 1 accurately converts the input gradation value of the XYZ color system to the RGB color system and outputs an image signal of the RGB color system. Includes systems with faithful color reproduction.
- the display device 2 receives an RGB color system image signal output from the correction device 1 and displays an image.
- the color display method of the present invention can be applied to display devices of all types, and thus is suitable for application not only to CRTs but also to LCDs and PDPs.
- the color display method of the display device according to the present invention can be used for various types of display devices. Therefore, all kinds of display devices can be widely used in fields where high-fidelity color reproduction is required.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Biomedical Technology (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Controls And Circuits For Display Device (AREA)
- Processing Of Color Television Signals (AREA)
- Facsimile Image Signal Circuits (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005516521A JP4122381B2 (ja) | 2003-12-24 | 2004-12-24 | 表示デバイスの色表示方式 |
EP04807669.9A EP1701554B1 (en) | 2003-12-24 | 2004-12-24 | Color display system with accurate conversion between the RGB and XYZ colorimetric systems |
US11/472,604 US7453610B2 (en) | 2003-12-24 | 2006-06-22 | Color display system and image transforming device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003427660 | 2003-12-24 | ||
JP2003-427660 | 2003-12-24 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/472,604 Continuation-In-Part US7453610B2 (en) | 2003-12-24 | 2006-06-22 | Color display system and image transforming device |
Publications (1)
Publication Number | Publication Date |
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WO2005062628A1 true WO2005062628A1 (ja) | 2005-07-07 |
Family
ID=34708904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/019312 WO2005062628A1 (ja) | 2003-12-24 | 2004-12-24 | 表示デバイスの色表示方式 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7453610B2 (ja) |
EP (1) | EP1701554B1 (ja) |
JP (1) | JP4122381B2 (ja) |
WO (1) | WO2005062628A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI408670B (zh) * | 2010-03-17 | 2013-09-11 | Top Victory Invest Ltd | 用於顯示器色彩校正的查找表產生方法 |
KR20130066129A (ko) * | 2011-12-12 | 2013-06-20 | 삼성디스플레이 주식회사 | 백라이트 유닛 및 이의 구동 방법 |
EP2955711B1 (en) | 2014-05-09 | 2018-11-21 | Ams Ag | Method for calibrating a color space transformation, method for color space transformation and color control system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0998444A (ja) * | 1995-10-02 | 1997-04-08 | Canon Inc | 画像処理方法および装置 |
JPH09200790A (ja) * | 1995-12-30 | 1997-07-31 | Samsung Electron Co Ltd | 2次元の色度分割を用いる色処理方法及びその装置 |
EP1271465A2 (en) | 2001-06-22 | 2003-01-02 | Eastman Kodak Company | Method for calibrating, characterizing and driving a color flat panel display |
JP2003323610A (ja) * | 2002-03-01 | 2003-11-14 | Nec Corp | プロジェクタの色補正方法および色補正装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1153444C (zh) * | 1995-10-02 | 2004-06-09 | 佳能株式会社 | 图象处理装置及方法 |
JPH11112819A (ja) * | 1997-09-30 | 1999-04-23 | Fuji Photo Film Co Ltd | 色変換ルックアップテーブル並びにその作成方法および装置並びにそれを用いた画像の色変換方法および装置 |
-
2004
- 2004-12-24 JP JP2005516521A patent/JP4122381B2/ja active Active
- 2004-12-24 EP EP04807669.9A patent/EP1701554B1/en not_active Expired - Fee Related
- 2004-12-24 WO PCT/JP2004/019312 patent/WO2005062628A1/ja active Application Filing
-
2006
- 2006-06-22 US US11/472,604 patent/US7453610B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0998444A (ja) * | 1995-10-02 | 1997-04-08 | Canon Inc | 画像処理方法および装置 |
JPH09200790A (ja) * | 1995-12-30 | 1997-07-31 | Samsung Electron Co Ltd | 2次元の色度分割を用いる色処理方法及びその装置 |
EP1271465A2 (en) | 2001-06-22 | 2003-01-02 | Eastman Kodak Company | Method for calibrating, characterizing and driving a color flat panel display |
JP2003323610A (ja) * | 2002-03-01 | 2003-11-14 | Nec Corp | プロジェクタの色補正方法および色補正装置 |
Non-Patent Citations (1)
Title |
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See also references of EP1701554A4 |
Also Published As
Publication number | Publication date |
---|---|
US20060268301A1 (en) | 2006-11-30 |
EP1701554A1 (en) | 2006-09-13 |
EP1701554A4 (en) | 2010-03-03 |
EP1701554B1 (en) | 2013-06-19 |
JPWO2005062628A1 (ja) | 2007-12-13 |
JP4122381B2 (ja) | 2008-07-23 |
US7453610B2 (en) | 2008-11-18 |
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