JP2010256899A - Calibration system and method for calibrating display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a calibration system and a method for calibrating colors of a display. <P>SOLUTION: The calibration system creates a transform model for performing color transformation between a first color space and a second color space. Three first target curves are defined and transformed by the transform model to create three lookup tables. The display is calibrated based on the three lookup tables. Consequently the color temperature of the display may be substantially constant for every gray scales. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to display calibration systems and methods, and more particularly, to a calibration system and method for calibrating display colors.

  In recent years, display technology has become increasingly advanced and flat displays have replaced most traditional cathode ray tube (CRT) displays. Among such flat displays, the thin film transistor liquid crystal display (TFT-LCD) is the most popular. In addition to thin film transistor liquid crystal displays, plasma displays and organic light emitting diode (OLED) displays are becoming increasingly popular. The display portion of a flat display includes a pixel array, which is typically a matrix array and is driven by a driver. The driver drives the corresponding pixel based on the arranged video data. Thus, under the control of the driver, the pixel can display a specific color at a specific time. However, in order to see the ideal color to the naked eye, the color displayed by the pixel still needs to be calibrated (eg, calibration with a gamma curve).

  Please refer to FIG. FIG. 1 is a relationship diagram between a gray scale in a traditional flat display and two color values x and y in a CIExyY color space. The vertical axis represents two color values x and y, and the horizontal axis represents gray scale. A curve 260 and a curve 262 correspond to the color values x and y, respectively, and the color values x and y are measured when the flat display is displaying a pattern. Each pattern has a corresponding gray scale, and this gray scale is a scale on the horizontal axis of FIG. Each pattern may be a black pattern, a gray pattern, or a white pattern. For example, the corresponding gray scale of the black pattern is 0, the corresponding gray scale of the white pattern is 255, and the corresponding gray scale of the gray pattern is 1 to 254. In an ideal situation, the two measured color values x and y are fixed values, otherwise the color temperature corresponding to the gray scale will be different. In other words, if the measured color values x and y are non-fixed values, the color temperature of each gray scale is also non-fixed, so that the colors displayed by the flat display lack consistency.

  Patent Document 1 and Patent Document 2 corresponding thereto disclose a video display apparatus, a video processing method, and a computer-readable interface capable of performing appropriate color reproduction so as to save the storage capacity. This video display device uses the first color corrector to refer to the three-dimensional color correction table based on the characteristic values of the video display device, thereby obtaining the color characteristics of the video display device and the reference color characteristics. In addition, an expected color correction is performed on the input video data. In addition, the video display device uses the second color corrector to refer to the one-dimensional color correction table, corrects the layer based on the application environment, and predicts input video data. Apply color correction.

  Patent Document 3 and Patent Document 4 corresponding thereto disclose a method of color calibration, which includes a plurality of sets of gray scale values of light sources displayed on a display by a color measurement system, and Selecting each grayscale representation value, performing a numerical calculation on each of the light selection data for each color, obtaining a fitting curve function that curve fits with the grayscale value data in each interval; and Using this fitting curve function, the matching gray scale expression value of the gray scale value in the interval is obtained and a comparison table is created, and the gamma curve of the gray scale data of the normalized image is set to a preset target. In order to correspond to the curve, first, the two curves are logarithmized and the corrected grayscale signal is obtained according to the above-mentioned comparison table. And display outputs the gray scale signal this modified to exhibit a distribution of gray scale.

Taiwan Patent No. I231715 US Patent No. 7079155 Taiwan Patent No. I283852 US Pat. No. 7,375,854

  It is an object of the present invention to provide a method for calibrating a display, and in particular to provide a method for maintaining the color temperature at a substantially constant value when the display displays each gray scale.

  Another object of the present invention is to provide a system for calibrating the color of the display, and in particular to provide a system that maintains the color temperature at a substantially constant value when the display displays each grayscale. .

  Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

  In order to achieve one or some or all of the above or other objectives, in one embodiment of the invention, a method for calibrating a display is provided. The method includes the steps of measuring the display using a measurement unit when the display displays three primary color patterns based on the three primary color image data sets, and generating three first measurement data sets; When displaying a black pattern based on the black image data collection, the display unit is measured using the measurement unit to generate a second measurement data collection, and the three first measurement data collections are processed using the processing unit. A step of creating a conversion model based on the second measurement data collection, the three primary color image data collections, and the black image data, and when the display displays a plurality of gray scale patterns based on the plurality of gray image data collections, Measuring the display using the measurement unit, generating a plurality of third measurement data sets, and a processing unit; Using the second measurement data collection and the third measurement data collection to create three first primary display curves, and using the conversion model, the three first primary display curves are Converting to a native display curve, defining three final target curves using a processing unit, and using a processing unit to define three final target curves based on three final target curves and three second native display curves. Creating a lookup table, providing the input video data collection to the processing unit, converting the input video data collection into a calibration video data collection based on the three lookup tables, and calibration Displaying a calibration image on a display based on the image data collection.

  In one embodiment of the present invention, a calibration system for calibrating a display is provided. The calibration system includes a measurement unit and a processing unit. The measurement unit measures the display when the display displays a plurality of patterns based on the plurality of video data collections, and generates a plurality of measurement data collections. The processing unit is coupled to the measurement unit, creating a conversion model and three lookup tables. Among them, the processing unit creates a conversion model based on three first measurement data collections, one second measurement data collection, three primary color video data collections and one black video data collection, of which three displays. When displaying the three primary color patterns based on one primary color image data set, the measurement unit generates three first measurement data sets by measuring the display, and the display is based on the black video data set. When the black pattern is displayed, the measurement unit generates a second collection of measurement data by measuring the display, of which the processing unit uses the conversion model to generate three first native display curves. The second primary display curve, and the processing unit determines that the three primary sources are based on the second measurement data set and the plurality of third measurement data sets. When the display curve is created and the display displays multiple grayscale patterns based on multiple gray video data collections, the measurement unit generates multiple third measurement data collections by measuring the display The processing unit defines three final target curves, and the processing unit creates three reference tables based on the three final target curves and the three second native display curves, Converts the input video data collection to the calibration video data collection based on the three lookup tables, and the processing unit outputs the calibration video data collection to the display and calibrates the display to the display based on the calibration video data collection. Display video.

  In one embodiment of the invention, the aforementioned processing unit comprises a signal generator, which is coupled to a display and outputs a video data collection to the display.

  In one embodiment of the present invention, the three primary color video data collections are a red video data collection, a green video data collection, and a blue video data collection, respectively, and the three primary color patterns are a red pattern, A green pattern and a blue pattern, the display displays a red pattern based on the red video data collection, the display displays a green pattern based on the green video data collection, and the display displays the blue video data collection. Based on this, a blue pattern is displayed.

  In one embodiment of the present invention, each gray image data set includes a first color subset, a second color subset, and a third color subset, and the first color subset, the second color subset, and the third color subset. The three pixel values of the subset are equal.

  In one embodiment of the present invention, the processing unit described above determines three final target curves by standardizing three second target curves, and the processing unit uses the conversion model to generate three first target curves. Into three second target curves.

  In one embodiment of the present invention, the processing unit zooms the three second target curves based on the ratio between the standard level of the three second target curves and the maximum of the three maximum levels. To standardize the three second target curves.

  In one embodiment of the present invention, when the processing unit defines two first target curves of the three first target curves, the processing unit determines the other first target curve of the three first target curves. And CIExyY color space based on three color values x, y and z.

  In one embodiment of the present invention, the processing unit zooms the gamma curve based on the maximum level of the first primary display curve of the three first primary display curves, thereby causing the other Define a single target curve.

  In one embodiment of the present invention, the other first target curve described above is a curve of the stimulus value Y in the CIE 1931 XYZ color space.

  In one embodiment of the present invention, the aforementioned processing unit calculates a compensation ratio based on the conversion model and the three maximum levels of the three final target curves, and the processing unit displays a display based on the compensation ratio. Increase the power of the light source.

The foregoing embodiments of the present invention have at least one of the following advantages. The conversion model is created in order to perform color conversion between the first color space and the second color space. Using the conversion model, three lookup tables are generated by defining and converting the three first target curves. The display is calibrated based on a lookup table so that for each grayscale, the color temperature displayed on the display can be maintained at a substantially constant value.
In order to make the above features and advantages of the present invention more apparent, examples will be given below and described in detail with reference to the drawings.

FIG. 6 is a relationship diagram between a gray scale in a conventional flat display and two color values x and y in a CIExyY color space. FIG. 3 is a functional block diagram of a calibration system and a display according to an embodiment of the present invention. 4 is a flowchart of a method for calibrating a display according to an embodiment of the present invention. It is a figure which shows how the measurement data collections 351-354 are produced | generated by measuring the test patterns 341-344 displayed on a display based on one Example of this invention. It is a figure which shows how measurement data collection MD1-MD255 is produced | generated by measuring the test patterns GP1-GP255 displayed on a display based on one Example of this invention. It is a figure explaining three first native display curves based on one example of the present invention. It is a figure explaining three first native display curves based on one example of the present invention. It is a figure explaining three first native display curves based on one example of the present invention. It is a figure explaining three 2nd native display curves based on one example of the present invention. It is a figure explaining three 2nd native display curves based on one example of the present invention. It is a figure explaining three 2nd native display curves based on one example of the present invention. It is a figure explaining three final target curves based on one Example of this invention. It is a figure explaining three final target curves based on one Example of this invention. It is a figure explaining three final target curves based on one Example of this invention. FIG. 6 illustrates an exemplary embodiment of the present invention when fixing a gamma curve with a color temperature of 6500K and a gamma value of 2.2. It is a figure explaining how three final target curves are created based on other examples of the present invention. It is a figure explaining the method of creating one of three reference tables based on one Example of this invention. FIG. 6 is a diagram illustrating how a processing unit performs color calibration on a display using three lookup tables. FIG. 6 is an explanatory diagram illustrating a relationship between a gray scale and two color values x and y of a display according to an embodiment of the present invention. FIG. 6 is another diagram illustrating the relationship between grayscale and two color values x, y of a display according to one embodiment of the present invention.

  The above-described and other technical contents, features, and effects related to the present invention will become apparent from the detailed description of the preferred embodiments with reference to the accompanying drawings. The directional terms mentioned in the present invention, such as up, down, left, right, front, back, etc., are only for reference to the direction of the attached drawings. Accordingly, the directional terminology used is used for purposes of explanation and is not intended to limit the invention.

と表示される。パラメータＲ、Ｇ及びＢは、それぞれ、映像データ集Ｓ_Ｇの赤、青、緑色の画素値を表す。また、測定データ集Ｓ_Ｍは、ＣＩＥ １９３１ ＸＹＺ色空間のデータであり、且つ、
（外２）

と表示される。そのうち、パラメータＸ、Ｙ及びＺは、それぞれ、測定データ集Ｓ_Ｍの三つの刺激値（ｔｒｉｓｔｉｍｕｌｕｓ ｖａｌｕｅｓ）Ｘ、Ｙ及びＺを表す。ＣＩＥ １９３１ ＸＹＺ色空間は、国際照明委員会（Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｃｏｍｍｉｓｓｉｏｎ ｏｎ Ｉｌｌｕｍｉｎａｔｉｏｎ：ＣＩＥ）により、西暦１９３１年に作られたものである。 Please refer to FIG. FIG. 2 is a functional block diagram of a calibration system 280 and a display 270 according to one embodiment of the present invention. The calibration system 280 is for performing color calibration on the display 270. The display 270 is, for example, a thin film liquid crystal display (TFT-LCD), an organic light emitting diode (OLED) display, a plasma display, or a cathode ray tube (CRT) display. Calibration system 280 includes a measurement unit 282 and a processing unit 284. In this embodiment, the measurement unit 282 is a video sensing device that can sense the color of the display 270. For example, the measurement unit 282 may be a display color analyzer whose model number is CA-210 manufactured by KONICA MINOLTA. However, the measurement unit of the present invention is not limited to this. In addition, the processing unit 284 may be a computer, a personal digital assistant (PDA), a set-top box, or the like. The processing unit 284 is coupled to the measurement unit 282 and the display 270, and the processing unit 284 includes a signal generator 286. Correlation signal generator 286 is coupled to a display 270, and the signal generator 286 outputs the video data concentrator _{S G} on the display 270, the display 270, based on the received output image data concentrator _{S G} Display the pattern. In this embodiment, the signal generator 286 is a display card, for example. However, the present invention is not limited to this. Display 270 when viewing the pattern on the basis of the input data current S _G, the measurement unit 282 may measure display 270, also generates measurement data collection S _M. In this embodiment, the video data collection _SG is RGB color video data, and
(Outside 1)

Is displayed. Parameters R, G and B, respectively, represent the red image data concentrator S _G, blue and green pixel values. In addition, the measurement data collection _{S M} is the data of the CIE 1931 XYZ color space, and,
(Outside 2)

Is displayed. Of these, the parameters X, Y and Z, respectively, represent three stimulus values of the measurement data collection _{S M (tristimulus values) X,} Y and Z. The CIE 1931 XYZ color space was created in 1931 AD by the International Commission on Illumination (CIE).

  Please refer to FIG. FIG. 3 is a flowchart of a method for calibrating a display according to an embodiment of the present invention. In step S302, the processing unit 284 creates a conversion model 288 for performing color conversion between the first color space and the second color space. In the present embodiment, the first color space is an RGB color space, and the RGB color space is defined by three primary colors of red, blue, and green. The second color space is the CIE 1931 XYZ color space. However, the present invention is not limited to this. For example, the first color space and the second color space are RGB color space, Adobe RGB color space, sRGB color space, CIE 1931 XYZ color space, IE xyY color space, CIE 1960 color space, CIE 1964 color space, and CIE 1976. Two different color spaces selected from the color space may be used. In one embodiment of the present invention, an exemplary color conversion model formula created by the processing unit 284 between the RGB color space and the CIE 1931 XYZ color space is expressed as follows:

そのうち、パラメータＯ_Ｒ、Ｏ_Ｇ及びＯ_Ｂは、それぞれ、映像データ集Ｓ_Ｇの画素値が赤、青、緑色の三原色に対する偏移量を表す。パラメータＣ_１１〜Ｃ_１３、Ｃ_２１〜Ｃ_２３及びＣ_３１〜Ｃ_３３は、転換モデル中の転換マトリックス
（外３）

の係数である。

Among them, the parameter _O R, _{O G,} and _{O B,} respectively, the pixel value of the image data concentrator _{S G} represents the shift amount of red, blue, for green triplet. Parameter _{C 11 ~C 13, C 21 ~C} 23 and _C 31 _{-C 33} are converted matrix in transformation model (outer 3)

Is the coefficient.

と表示される。三つの原色パターン３４１〜３４３は、ディスプレイ２７０に同期又は順次に表示されることができる。ディスプレイ２７０に三つの原色パターン３４１〜３４３を表示するときに、測定ユニット２８２を用いてディスプレイ２７０を測定することにより、三つの第一測定データ集３５１〜３５３を生成する。この実施例において、三つの第一測定データ集３５１〜３５３は、それぞれ、
（外５）

と表示される。具体的に言えば、ディスプレイ２７０は赤色パターン３４１を表示するときに、測定ユニット２８２は測定データ集
（外６）

を生成し、ディスプレイ２７０は緑色パターン３４２を表示するときに、測定ユニット２８２は測定データ集
（外７） Please refer to FIG. 2 and FIG. Prior to creating the conversion model 288, the signal generator 286 transmits the three primary color video data collections 331 to 333 to the display 270, and the display 270 is based on the received three primary color video data collections 331 to 333. Three primary color patterns 341 to 343 are displayed. The three primary color video data collections 331 to 333 are a red video data collection 331, a green video data collection 332, and a blue video data collection 333, respectively. The three primary color patterns 341 to 343 represent a red video pattern 341, a green pattern 342, and a blue pattern 343, respectively. Among them, the display 270 displays the red pattern 341 based on the red video data collection 331, displays the green pattern 342 based on the green video data collection 332, and displays the blue pattern 343 based on the blue video data collection 333. indicate. In this embodiment, the three primary color image data collections 331 to 333 are RGB color image data collections,
(Outside 4)

Is displayed. The three primary color patterns 341 to 343 can be displayed on the display 270 synchronously or sequentially. When the three primary color patterns 341 to 343 are displayed on the display 270, three first measurement data collections 351 to 353 are generated by measuring the display 270 using the measurement unit 282. In this embodiment, the three first measurement data collections 351 to 353 are respectively
(Outside 5)

Is displayed. Specifically, when the display 270 displays the red pattern 341, the measurement unit 282 displays the measurement data collection (outside 6).

When the display 270 displays the green pattern 342, the measurement unit 282 collects the measurement data (outside 7).

を生成し、且つ、ディスプレイ２７０は青色パターン３４３を表示するときに、測定ユニット２８２は測定データ集
（外８）

を生成する。数式（１）により、三つの原色映像データ集３３１〜３３３と三つの第一測定データ集３５１〜３５３との間の関係は、次のように表れる。

And when the display 270 displays the blue pattern 343, the measurement unit 282 may collect the measurement data (outside 8).

Is generated. The relationship between the three primary color image data collections 331 to 333 and the three first measurement data collections 351 to 353 is expressed by the following equation (1).

また、黒色映像データ集３３４がディスプレイ２７０に伝送され、ディスプレイ２７０に、黒色映像データ集３３４に従って黒色パターン３４４を表示させる。この実施例において、黒色映像データ集３４４は、
（外９）

と表示される。ディスプレイ２７０は黒色パターン３４４を表示するときに、測定ユニット２８２はディスプレイ２７０を測定し、また、第二測定データ集３５４を生成する。この実施例において、第二測定データ集３５４は、
（外１０）

と表示される。数式（１）により、黒色映像データ集３３４と第二測定データ集３５４との間の関係は、次のように表れる。

Further, the black image data collection 334 is transmitted to the display 270, and the black pattern 344 is displayed on the display 270 according to the black image data collection 334. In this embodiment, the black image data collection 344 is
(Outside 9)

Is displayed. When the display 270 displays the black pattern 344, the measurement unit 282 measures the display 270 and generates a second measurement data collection 354. In this embodiment, the second measurement data collection 354 is:
(Outside 10)

Is displayed. The relationship between the black image data collection 334 and the second measurement data collection 354 is expressed by the following equation (1).

測定データ集のパラメータ
（外１１）

は、既に知られたものであるので、処理ユニット２８４は、数式（２）〜（５）に基づいて、パラメータＣ_１１〜Ｃ_１３、Ｃ_２１〜Ｃ_２３、Ｃ_３１〜Ｃ_３３、Ｏ_Ｒ、Ｏ_Ｇ及びＯ_Ｂを算出できる。これにより、処理ユニット２８４は、三つの第一測定データ集３５１〜３５３、第二測定データ集３５４、三つの原色映像データ集３３１〜３３３及び黒色映像データ集３３４に基づいて、転換モデル２８８を作成する。一つの例示的な転換モデル２８８は、次のように表れる。

Measurement data collection parameters (outside 11)

Since those that were already known, the processing unit 284, based on the equation (2) to (5), the parameter _{C 11 ~C 13, C 21 ~C} 23, C 31 ~C 33, O R, the O _G and _{O B} can be calculated. As a result, the processing unit 284 creates the conversion model 288 based on the three first measurement data collections 351 to 353, the second measurement data collection 354, the three primary color video data collections 331 to 333, and the black video data collection 334. To do. One exemplary transformation model 288 appears as follows:

再び図３を参照する。転換モデル２８８が作成された後に、処理ユニット２８４は、ステップＳ３０４において、ディスプレイ２７０の三つの第一原生表示曲線を作成する。ディスプレイ２７０の三つの第一原生表示曲線を作成する前に、処理ユニット２８４の信号生成器２８６は、複数の灰色映像データ集をディスプレイ２７０に伝送する。図２と図５を参照する。信号生成器２８６は、複数の灰色映像データ集ＴＰ１〜ＴＰ２５５をディスプレイ２７０に伝送し、これにより、ディスプレイ２７０は、複数の灰色映像データ集ＴＰ１〜ＴＰ２５５に基づいて複数のグレースケールパターンＧＰ１〜ＧＰ２５５を表示する。この実施例において、灰色映像データ集ＴＰ１〜Ｔｐ２５５は、ＲＧＢ色系における映像データであり、且つ、それぞれ、
（外１２）

・・・及び
（外１３）

と表示される。具体的に言えば、マトリックス
（外１４）

の中のパラメータＲ、Ｇ及びＢは、それぞれ、映像データ集Ｓ_Ｇの中の第一色サブセット、第二色サブセット及び第三色サブセットの三つの画素値を表す。そのうち、マトリックス（外１５）

の中の符号Ｒは、赤色の第一色サブセットの画素値を表し、マトリックス
（外１６）

Refer to FIG. 3 again. After the conversion model 288 is created, the processing unit 284 creates three first native display curves on the display 270 in step S304. Prior to creating the three first native display curves of display 270, signal generator 286 of processing unit 284 transmits a plurality of gray video data collections to display 270. Please refer to FIG. 2 and FIG. The signal generator 286 transmits the plurality of gray image data collections TP1 to TP255 to the display 270, so that the display 270 receives the plurality of grayscale patterns GP1 to GP255 based on the plurality of gray image data collections TP1 to TP255. indicate. In this embodiment, the gray image data collections TP1 to Tp255 are image data in the RGB color system, and
(Outside 12)

... and (outside 13)

Is displayed. Specifically, matrix (outside 14)

The parameters R, G and B in each represent the first color subset, three pixel values of the second color subsets and third color subset of video data concentrator S _G. Among them, matrix (outside 15)

The symbol R in represents the pixel values of the first color subset of red, and the matrix (outside 16)

の中の符号Ｇは、緑色の第二色サブセットの画素値を表し、且つ、マトリックス
（外１７）

の中の符号Ｂは、青色の第三色サブセットの画素値を表す。また、灰色映像データ集ＴＰ１〜ＴＰ２５５は、第一色サブセット、第二色サブセット及び第三色サブセットにある三つの画素値が等しい。例えば、一つ目の灰色映像データ集ＴＰ１の三つの画素値は全て１であり、二つ目の灰色映像データ集ＴＰ２の三つの画素値は全て２であり、三つ目の灰色映像データ集ＴＰ３の三つの画素値は全て３であり、これ以降は、類似する。また、ディスプレイ２７０は、一つ目の灰色映像データ集ＴＰ１に基づいてグレースケールパターンＧＰ１を表示し、二つ目の灰色映像データ集ＴＰ２に基づいてグレースケールパターンＧＰ２を表示し、且つ、三つ目の灰色映像データ集ＴＰ３に基づいてグレースケールパターンＧＰ３を表示し、これ以降は、類似する。灰色映像データ集ＴＰ１〜ＴＰ２５５は、ディスプレイ２７０に同期又は順次に表示されることができる。ディスプレイ２７０はグレースケールパターンＧＰ１〜ＧＰ２５５を表示するときに、測定ユニット２８２はディスプレイ２７０を測定し、複数の第三測定データ集ＭＤ１〜ＭＤ２５５を生成する。ディスプレイ２７０はグレースケールパターンＧＰ１を表示するときに、測定ユニット２８２はディスプレイ２７０を測定することにより、測定データ集ＭＤ１を生成し、ディスプレイ２７０はグレースケールパターンＧＰ２を表示するときに、測定ユニット２８２はディスプレイ２７０を測定することにより、測定データ集ＭＤ２を生成し、これ以降は、類似する。この実施例において、第三測定データ集ＭＤ１〜ＭＤ２５５は、色空間ＣＩＥ １９３１ ＸＹＺにおけるデータであり、且つ、それぞれ、
（外１８）

・・・及び
（外１９）

と表示される。

The symbol G in represents the pixel values of the green second color subset and the matrix (outside 17)

The symbol B in represents the pixel values of the blue third color subset. Further, the gray image data collections TP1 to TP255 have the same three pixel values in the first color subset, the second color subset, and the third color subset. For example, all three pixel values of the first gray image data collection TP1 are 1, all three pixel values of the second gray image data collection TP2 are 2, and the third gray image data collection TP1. The three pixel values of TP3 are all 3, and the subsequent values are similar. The display 270 displays the grayscale pattern GP1 based on the first gray image data collection TP1, displays the grayscale pattern GP2 based on the second gray image data collection TP2, and includes three A gray scale pattern GP3 is displayed based on the gray image data collection TP3 of the eyes, and the subsequent processes are similar. The gray image data collections TP1 to TP255 can be displayed on the display 270 synchronously or sequentially. When the display 270 displays the gray scale patterns GP1 to GP255, the measurement unit 282 measures the display 270 and generates a plurality of third measurement data collections MD1 to MD255. When the display 270 displays the grayscale pattern GP1, the measurement unit 282 generates the measurement data collection MD1 by measuring the display 270, and when the display 270 displays the grayscale pattern GP2, the measurement unit 282 By measuring the display 270, a measurement data collection MD2 is generated, and the subsequent processes are similar. In this embodiment, the third measurement data collections MD1 to MD255 are data in the color space CIE 1931 XYZ, and
(Outside 18)

... and (outside 19)

Is displayed.

と第三測定データ集
（外２１）

に基づいてディスプレイ２７０の三つの第一原生表示曲線を作成する。図６Ａ〜図６Ｃを参照する。図６Ａ〜図６Ｃは、本発明の実施例により、三つの第一原生表示曲線３６１〜３６３を説明する図である。三つの第一原生表示曲線３６１〜３６３の縦軸は、それぞれ、ＣＩＥ １９３１ ＸＹＺ色空間の三つの刺激値Ｘ、Ｙ及びＺを表す。三つの第一原生表示曲線３６１〜３６３の横軸は、灰色映像データ集ＴＰ１〜ＴＰ２５５のうち一つのグレースケール、又は、黒色映像データ集３３４のグレースケールに対応する指数を表す。例えば、測定ユニット２８２は、第ｎ個のグレースケールパターンＧＰｎを測定した後に、測定ユニット２８２は、第三測定データ集ＭＤ１〜ＭＤ２５５のうち対応する一つの第三測定データ集（即ち、第ｎ個の第三測定データ集ＭＤｎ）を生成し、そのうち、測定データ集ＭＤｎは、
（外２２）

と表示されることができる。よって、指数ｎ及び測定データ集
（外２３）

により、原生表示曲線３６１のノードＡ、原生表示曲線３６２のノードＢ及び原生表示曲線３６３のノードＣを定位することができる。また、測定データ集
（外２４）

により、図６Ａ〜図６Ｃの原点を決定することができ、且つ、図６Ａ〜図６Ｃの原点は、それぞれ、（０，Ｘ_０）、（０，Ｙ_０）及び（０，Ｚ_０）と表示される。 In step S304, the processing unit 284, the second measurement data collection (outside 20)

And third measurement data collection (outside 21)

Based on the above, three first native display curves of the display 270 are created. Please refer to FIG. 6A to FIG. 6C. 6A to 6C are diagrams illustrating three first native display curves 361 to 363 according to an embodiment of the present invention. The vertical axes of the three first primary display curves 361 to 363 represent the three stimulus values X, Y, and Z in the CIE 1931 XYZ color space, respectively. The horizontal axis of the three first primary display curves 361 to 363 represents an index corresponding to one gray scale of the gray image data collections TP1 to TP255 or the gray scale of the black image data collection 334. For example, after the measurement unit 282 measures the n-th gray scale pattern GPn, the measurement unit 282 performs one third measurement data collection (that is, the n-th measurement data collection) among the third measurement data collections MD1 to MD255. Of the third measurement data collection MDn), of which the measurement data collection MDn is
(Outside 22)

Can be displayed. Therefore, index n and measurement data (outside 23)

Thus, the node A of the native display curve 361, the node B of the native display curve 362, and the node C of the native display curve 363 can be localized. In addition, collection of measurement data (outside 24)

6A to 6C can be determined, and the origins of FIGS. 6A to 6C are (0, X ₀ ), (0, Y ₀ ) and (0, Z ₀ ), respectively. Is displayed.

は、
（外２６）

に転換されることができる。即ち、
（外２７）

である。よって、処理ユニット２８４は、転換モデル２８８により、三つの第一原生表示曲線３６１〜３６３を三つの第二原生表示曲線３７１〜３７３に転換することができる。 Refer to FIG. 3 again. In step S306, the processing unit 284 uses the conversion model 288 to convert the three first native display curves 361 to 363 into three second native display curves. Please refer to FIG. 7A to FIG. 7C. 7A to 7C are diagrams illustrating three second native display curves 371 to 373 according to an embodiment of the present invention. The vertical axes of the three second native display curves 371 to 373 represent the pixel values R, G, and B in RGB color space vision, respectively, and the horizontal axes of the second native display curves 371 to 373 are RGB Represents the primitive pixel values R, G and B of the color space. For example, the corresponding primitive pixel values of node D of the native display curve 371, node E of the native display curve 372, and node F of the native display curve 373 are n, and at the same time, , Corresponding to the visual pixel values Rn, Gn and Bn, respectively. Measurement data collection (outside 25) by conversion model 288

Is
(Outside 26)

Can be switched to. That is,
(Outside 27)

It is. Therefore, the processing unit 284 can convert the three first native display curves 361 to 363 into the three second native display curves 371 to 373 using the conversion model 288.

  Refer to FIG. 3 again. In step S308, the processing unit 284 defines three final target curves 381-383. After the color calibration of display 270 is over, the three final target curves 381-383 described above can be used to display most characteristics of display 270 after calibration. The horizontal axes of FIGS. 8A to 8C represent red, green, and blue input pixel values, respectively, and the vertical axes of FIGS. 8A to 8C respectively represent red and green that are visually displayed on the display 270. Represents a blue pixel value.

  In an embodiment of the present invention, when the processing unit 284 defines three final target curves 381 to 383, first, the processing unit 284 converts the three first target curves into three second target curves, The processing unit 284 then standardizes the three second target curves, thereby obtaining the three final target curves. Please refer to FIG. The processing unit 284 converts the three first target curves 391-393 into three second target curves 401-403, after which the processing unit 284 normalizes the three second target curves 401-403, thereby Three final target curves 381 to 383 are obtained. Three first target curves 391 to 393 represent the three stimulus values X, Y, and Z that the display 270 after color calibration exhibits. In this embodiment, the first target curve 392 has been converted from a gamma curve. For example, a gamma curve having a gamma value of 2.2 is defined as follows.

そのうち、Ｖ_ＩＮは、ガンマ曲線の入力であり、Ｖ_ＯＵＴは、ガンマ曲線の出力であり、０≦Ｖ_ＩＮ≦１、且つ、０≦Ｖ_ＯＵＴ≦１である。

Among them, V _IN is an input of a gamma curve, V _OUT is an output of the gamma curve, and 0 ≦ V _IN ≦ 1 and 0 ≦ V _OUT ≦ 1.

  In this embodiment, the processing unit 284 defines the first target curve 392 by zooming the gamma curve based on the maximum value of the first characteristic display curve 362. Among them, the first characteristic curve 362 corresponds to the first target curve 392, and the first target curve 392 appears as follows.

この実施例において、Ｙｔ_２５５は、特性表示曲線３６２の刺激値Ｙの最大値（即ち、Ｙｔ_２５５＝Ｙ_２５５）に等しく、ｎは指数の値を表し、Ｙｔ_ｎは、指数がｎに等しいときに、第一目標曲線３９２の対応する刺激値Ｙを表す。

In this example, Yt ₂₅₅ is equal to the maximum stimulus value Y of the characteristic curve 362 (ie, Yt ₂₅₅ = Y ₂₅₅ ), n represents the exponent value, and Yt _n is the exponent equal to n. Represents the corresponding stimulus value Y of the first target curve 392.

  After the processing unit 284 has defined the first target curve 392, the processing unit 284 determines the other two first based on the first target curve 392 and the color values x, y, z of the three CIE xyY color spaces. Target curves 391 and 393 are defined. According to the CIE xyY color space standard, the three color values x, y, and z are expressed as follows.

よって、刺激値ＸとＺは、次のように表れる。

Therefore, the stimulus values X and Z are expressed as follows.

この実施例において、ディスプレイ２７０に一致の色温度を持たせるために、色値ｘ、ｙ、ｚは、固定値を要する。色値ｘ、ｙ、ｚは固定値であるので、その他の二つの第一目標曲線３９１と３９３は、それぞれ、次のように表れる。

In this embodiment, the color values x, y, and z require fixed values in order for the display 270 to have the same color temperature. Since the color values x, y, and z are fixed values, the other two first target curves 391 and 393 are expressed as follows.

処理ユニット２８４は三つの第一目標曲線３９１〜３９３を定義した後に、処理ユニット２８４は転換モデル２８８を再び用いて三つの第一目標曲線３９１〜３９３を三つの第二目標曲線４０１〜４０３に転換する。よって、図９の三つの第二目標曲線４０１〜４０３の画素値Ｒｔ_ｎ、Ｇｔ_ｎ及びＢｔ_ｎは、次の式により算出できる。

After processing unit 284 defines three first target curves 391-393, processing unit 284 again uses conversion model 288 to convert three first target curves 391-393 into three second target curves 401-403. To do. Therefore, the pixel values Rt _n , Gt _n and Bt _n of the three second target curves 401 to 403 in FIG. 9 can be calculated by the following formula.

なお、三つの第二目標曲線４０１〜４０３の最大値は、２５５（即ち、ＲＧＢ色系の標準レベル）より大きくなる可能性がある。この場合は、前述の標準レベルに合わせるよう三つの第二目標曲線４０１〜４０３がズーミングされることができる。処理ユニット２８４により三つの第二目標曲線４０１〜４０３をズーミングする前に、処理ユニット２８４においてズーミング比が定義される。本実施例において、前述のズーミング比は、前述の標準レベルが三つの第二目標曲線４０１〜４０３の三つの最大レベルのうち最大値に対する比と等しい。例えば、この実施例において、三つの第二目標曲線４０１〜４０３の最大レベルは、それぞれ、２６５、２５５及び２４０であれば、三つの第二目標曲線４０１〜４０３の最大レベルのうち最大値は、２６５である。標準レベルは２５５（即ち、２^８−１）であるので、ズーミング比は、２５５／２６５である。具体的に言えば、三つの最終目標曲線３８１〜３８３は、それぞれ、次のように表われる。

Note that the maximum values of the three second target curves 401 to 403 may be larger than 255 (that is, the standard level of the RGB color system). In this case, the three second target curves 401 to 403 can be zoomed to match the aforementioned standard level. Before zooming the three second target curves 401-403 by the processing unit 284, a zooming ratio is defined in the processing unit 284. In the present embodiment, the zooming ratio is equal to the ratio of the standard level to the maximum value among the three maximum levels of the three second target curves 401 to 403. For example, in this embodiment, if the maximum levels of the three second target curves 401 to 403 are 265, 255, and 240, respectively, the maximum value among the maximum levels of the three second target curves 401 to 403 is H.265. Since the standard level is 255 (ie 2 ⁸ -1), the zooming ratio is 255/265. Specifically, the three final target curves 381 to 383 are represented as follows.

そのうち、パラメータＲ_ｓは、前述のズーミング比を表す。

Among them, the parameter R _s represents the zooming ratio described above.

FIG. 9 is a diagram illustrating an exemplary embodiment of the present invention when the color temperature is fixed at 6500K and the gamma value of the gamma curve is fixed at 2.2. In other embodiments of the present invention, the processing unit 284 can generate various three final target curves based on various demands for display 270 color calibration. For example, the display 270 may be a special display, and the display 270 may satisfy a standard of medical digital video and communication (Digital Imaging and Communications in Medicine, DICOM). Please refer to FIG. FIG. 10 is a diagram for explaining three first target curves 411 to 413 of the DICOM display. The processing unit 284 converts the three first target curves 411 to 413 to the three second target curves 421 to 423 using the conversion model 288, and then, based on the zooming ratio described above, the three second target curves. Zooming is performed on 421 to 423. In this embodiment, the zooming ratio is 255/336. In FIG. 10, the pixel values Rt ′ _n , Gt ′ _n and B′t _n of the three second target curves 421 to 423 can be calculated by the following equations.

また、三つの最終目標曲線４３１〜４３３は、それぞれ、次のように表れることができる。

Further, the three final target curves 431 to 433 can be expressed as follows.

そのうち、パラメータＲ′_ｓは、本実施例のズーミング比を表す。

Of these, the parameter R ′ _s represents the zooming ratio of the present embodiment.

  Please refer to FIG. 2 and FIG. 3 again. After creating the three final target curves, the processing unit 284 creates three lookup tables 291-293 based on the three final target curves and the three second native display curves. For example, in the embodiment of FIGS. 7A-7C and FIG. 9, the processing unit 284 may have three lookup tables 291-293 based on three final target curves 381-383 and three second native display curves 371-373. Create Specifically, the processing unit 284 creates the first reference table 291 based on the final target curve 381 and the second native display curve 371, and the processing unit 284 determines the final target curve 382 and the second native display curve. The second reference table 292 is created based on 372, and the processing unit 284 creates the third reference table 293 based on the final target curve 383 and the second native display curve 373. The three reference tables 291 to 293 are used when calibrating the red, green, and blue colors of the display 270, respectively. FIG. 11 is a diagram for explaining the creation of one of the three lookup tables 291 to 293 according to the embodiment of the present invention. In FIG. 11, one of the three final target curves 381 to 383 is drawn on the right side of the figure, one of the three second native display curves 371 to 373 is drawn in the middle of the figure, and The correspondence reference table created by the processing unit 284 is drawn on the left side of the figure. FIG. 11 illustrates the correspondence between the input pixel value and the display pixel value of the final target curve. The reference table, the second native display curve, and the final target curve in FIG. 11 all correspond to the same color (for example, red, green, and blue). According to the final target curve shown in FIG. 11, when the input pixel value is 130, the corresponding display pixel value is 102. As shown in FIG. 11, the calibration pixel value of the second native display curve corresponding to the display pixel value 102 is 128. This allows the processing unit 284 to create a relationship between the input pixel value 130 and the calibration pixel value 128 in the lookup table. Similarly, the processing unit 284 can create a relationship between more input pixel values and calibration pixel values in the lookup table. After the relationship between the input pixel value and the calibration pixel value is created in the three lookup tables, the processing unit 284 converts the received input video data collection into the calibration video data collection based on the three lookup tables. To do.

Please refer to FIG. After the processing unit 284 receives the input video data collection S _in , the processing unit 284 converts the input video data collection S _in into a calibration video data collection S _cb based on the three lookup tables 291-293. The calibration video data collection S _cb may be transmitted to the display 270, thereby causing the display 270 to display the calibration video 440 based on the calibration video data collection S _cb .

  Please refer to FIG. FIG. 13 is a diagram illustrating the relationship between grayscale and the two color values x and y of the display 270 according to an embodiment of the present invention. Among them, the vertical axis represents color values x and y, respectively, and the horizontal axis represents gray scale. A curve 450 corresponds to the color value y, and a curve 452 corresponds to the color value x. As shown in the figure, the two color values x and y are maintained substantially coincident values. Therefore, the color temperature of each gray scale of the display 270 is substantially fixed.

  Refer to FIG. FIG. 14 is another exemplary diagram illustrating the relationship between the gray scale and the two color values x, y of the display 270, according to one embodiment of the present invention. The vertical axis represents two color values x and y, and the horizontal axis represents gray scale. A curve 460 corresponds to the color value y, and a curve 462 corresponds to the color value x. The two color values x and y are maintained at a substantially constant value, whereby the color temperature of each gray scale of the display 270 is substantially fixed.

Refer to FIG. 2 again. In an embodiment of the present invention, the display 270 is a liquid crystal display (LCD) having a light source 272. The light source 272 is a backlight module. When the display 270 is turned on, the backlight module provides a backlight to the display 270. Three second target curves 401 to 403 or 421 to 423 zoomed (ie, standardized) by the processing unit 284 based on the mathematical expressions (17) to (19) or (21) to (23) The value (Rf _n , Gf _n , Bf _n ) or (Rf ′ _n , Gf ′ _n , Bf ′ _n ) is the pixel value (Rt _n , Gt _n , Bt _n ) or (Rt ′ _n , Gt ′ _n , Bt ′ _N ) is smaller. Therefore, the video displayed on the display 270 may be blacker than the video that the user wants to see. The processing unit 284 transmits a control signal Sc to the backlight module 272 in order to increase the power of the backlight module 272 in order to compensate for the luminance difference between the displayed video and the video that the user wants to see. Thereby, the video image displayed on the display 270 becomes brighter and can satisfy the user's needs.

In an embodiment of the present invention, the processing unit 284 generates the control signal Sc based on the three maximum levels of the three final target curves. Please refer to FIG. If the three maximum levels of the three final target curves 381 to 383 are, for example, 255, 245, and 231, the three maximum levels of the three final target curves 381 to 383 and the three correspondences are obtained according to Equation (1). The relationship between the stimulus values (X _m , Y _m , Z _m ) to be expressed can be expressed as follows.

この実施例において、三つの最終目標曲線３８１〜３８３の三つの最大レベルは、例えば、２５５、２４５及び２３１であり、三つの対応する刺激値（Ｘ_ｍ、Ｙ_ｍ、Ｚ_ｍ）は、例えば、１４６、１６１及び８５である。これにより、処理ユニット２８４は、
（外２８）

（即ち、
（外２９）

である補償比を得ることができる。具体的に言えば、補償比は、刺激値Ｙ_ｍに関係する。処理ユニット２８４は、補償比
（外３０）

に基づいて制御信号Ｓｃを生成し、これにより、ディスプレイ２７０に表示される映像の輝度は、バックライトモジュール２７２のパワーの増加により高くなる。バックライトモジュール２７２のパワーが増加した後に、ディスプレイ２７０の刺激値ＹはＹ_２５５と等しく、且つ、ディスプレイ２７０に表示される映像に充分な輝度を持たせ、また、ユーザに見たい映像が見えるようになる。

In this example, the three maximum levels of the three final target curves 381-383 are, for example, 255, 245 and 231 and the three corresponding stimulus values (X _m , Y _m , Z _m ) are, for example, 146, 161 and 85. This allows the processing unit 284 to
(Outside 28)

(I.e.
(Outside 29)

A compensation ratio can be obtained. Specifically, the compensation ratio is related to the stimulus value Y _m. The processing unit 284 has a compensation ratio (outside 30)

Based on the control signal Sc, the luminance of the video displayed on the display 270 becomes higher due to the increase in the power of the backlight module 272. After the power of the backlight module 272 is increased, the stimulus value Y of the display 270 is equal to Y ₂₅₅ , and the image displayed on the display 270 has sufficient luminance so that the user can see the desired image. become.

Similarly, in FIG. 10, three stimulation values (X ′ _m , Y ′ _m , Z ′ _m ) corresponding to the three maximum levels of the three final target curves 431 to 433 are also obtained by the equation (1). . That is:

この場合、刺激値Ｙ′_ｍは、１３５．９７と等しいので、補償比は、
（外３１）

（即ち、
（外３２）

と等しい。よって、ディスプレイ２７０に表示される映像と、ユーザが見たい映像との間の輝度の差は、補償比
（外３３）

により補償されることができる。

In this case, since the stimulus value Y ′ _m is equal to 135.97, the compensation ratio is
(Outside 31)

(I.e.
(Outside 32)

Is equal to Therefore, the difference in luminance between the video displayed on the display 270 and the video that the user wants to see is the compensation ratio (outside 33).

Can be compensated.

  In summary, the above-described embodiment of the present invention has at least one of the following advantages. In the foregoing embodiment of the present invention, a conversion model is created, and color conversion between the first color space and the second color space is performed by the conversion model. The three first native display curves are created based on the measurement data collection. Among these, the above-described measurement data collection is obtained by measuring the display by the measurement unit when the display displays three primary color patterns, a black pattern, and a plurality of gray scale patterns. Thereafter, the three first native display curves are converted into three second native display curves by the above-described conversion model, and further, the display in the second color space is displayed by the three second primary display curves. Create characteristics. Then, the three final target curves and the three second native display curves are used to create three display color calibration reference tables, and the three reference tables are used to calibrate the display, thereby The gray scale color temperature can have a substantially constant value. In addition, the power of the light source (eg, backlight module) of the display can be adjusted based on the compensation ratio, so that the difference in brightness between the video displayed on the display and the video that the user wants to see. Can be compensated.

  Although the present invention has been disclosed above based on the preferred embodiments described above, the preferred embodiments described above are not intended to limit the present invention, and those skilled in the art will understand the spirit of the present invention. As long as the scope of the present invention is not deviated, minor modifications and color changes can be made to the present invention. Therefore, the protection scope of the present invention is based on what is defined in the appended claims. In addition, any embodiment or claim of the present invention need not achieve all of the objects, advantages or features disclosed in the present invention. Further, the abstract part and the title of the invention are only for assisting the search of documents, and do not limit the scope of rights of the present invention.

260 Color value x in CIExyY color space
262 Color value y in CIExyY color space
270 Display 272 Light source 280 Calibration system 282 Measurement unit 284 Processing unit 286 Signal generator 288 Conversion model 291 First reference table 292 Second reference table 293 Third reference table 331 Red video data collection 332 Green video data collection 333 Blue video data collection 334 Black image data collection 341 Red pattern 342 Green pattern 343 Blue pattern 344 Black pattern 351 First measurement data collection 352 First measurement data collection 353 First measurement data collection 354 Second measurement data collection 361-363 First primary display curve 371 -373 Second native display curve 381-383, 431-433 Final target curve 391-393, 411-413 First target curve 401-403, 421-423 Second target curve 440 Calibration image 450, 452, 4, 0,462 curve Sc control signal S _G output image data concentrator S _M measurement data concentrator S302~S312 flowchart step TP1~TP255 gray video data concentrator MD1~MD255 third measurement data collection GP1~GP255 grayscale X ₀ ~X _255, Y _{0 to} Y ₂₅₅ , Z _{0 to} Z ₂₅₅ : Stimulus values in CIE 1931 XYZ color space R _n , G _n , B _n : Visual pixel values in RGB color space Xt, Yt, Zt: Stimulus values Rt, Gt, Bt: Three primary color pixel values S _in : Input video data collection S _cb : Calibration video data collection

Claims (19)

A method for calibrating a display comprising:
When the display displays three primary color patterns based on three primary color image data collections, measuring the display by a measurement unit to generate three first measurement data collections;
Measuring the display by the measurement unit when the display displays a black pattern based on a black image data collection, and generating a second measurement data collection;
Processing unit to create a conversion model based on the three first measurement data collections, the second measurement data collection, the three primary color image data collections, and the black image data;
When the display displays a plurality of grayscale patterns based on a plurality of gray image data collections, the display unit measures the display and generates a plurality of third measurement data collections;
Generating three first native display curves based on the second measurement data collection and the third measurement data collection by the processing unit;
Converting the three first native display curves into three second native display curves according to the conversion model;
Defining three final target curves by the processing unit;
Creating three lookup tables by the processing unit based on the three final target curves and the three second native display curves;
Providing input video data collection to the processing unit;
Converting the input video data collection into a calibration video data collection based on the three lookup tables;
Displaying calibration video on the display based on the calibration video data collection;
Including a method. The three primary color video data collections are a red video data collection, a green video data collection and a blue video data collection, respectively, and the three primary color patterns are a red pattern, a green pattern and a blue pattern, respectively. The display displays the red pattern based on the red video data collection, the display displays the green pattern based on the green video data collection, and the display displays the blue video data collection. Based on the blue pattern,
The method of claim 1. Each of the plurality of gray image data collections includes a first color subset collection, a second color subset collection, and a third color subset collection, and the first color subset collection, the second color subset collection, and the first color subset collection. The three pixel values of the three-color subset collection are equal.
The method of claim 1. The step of defining the three final target curves by the processing unit comprises:
Standardizing three second target curves by the processing unit to obtain the three final target curves;
Converting the three first target curves into the three second target curves according to the conversion model;
including,
The method of claim 1. The processing unit zooms the three second target curves based on a ratio between a standard level of the three second target curves and a maximum value among the three maximum levels, and the three second target curves. Standardize the target curve,
The method of claim 4. When the processing unit defines two first target curves out of the three first target curves, the processing unit includes other first target curves and CIE xyY colors out of the three first target curves. Define based on the three color values x, y, z of the space,
The method of claim 4. The processing unit zooms a gamma curve based on a maximum level of one of the three first native display curves and defines the other first target curve line;
The method of claim 6. The other first target curve is a curve of the stimulus value Y in the CIE 1931 XYZ color space.
The method of claim 7. The method further comprises:
Calculating a compensation ratio based on the three maximum levels of the conversion model and the three final target curves;
Increasing the power of the light source of the display based on the compensation ratio;
including,
The method of claim 4. A calibration system for calibrating a display,
A measuring unit that measures the display when generating a plurality of patterns based on a plurality of video data collections and generates a plurality of measurement data collections;
A processing unit coupled to the measurement unit to create a conversion model and three lookup tables;
Including
The processing unit creates the conversion model based on three first measurement data collections, one second measurement data collection, three primary color image data collections and one black image data, wherein the display is When displaying three primary color patterns based on three primary color image data collections, the measurement unit measures the display to generate the three first measurement data collections, and the display uses the black video data sets. When displaying a black pattern based on a collection, the measurement unit measures the display and generates the second measurement data collection;
The processing unit converts three first native display curves into three second native display curves according to the conversion model, and the processing unit is based on the second measurement data collection and a plurality of third measurement data collections. The three first primary display curves and when the display displays a plurality of gray scale patterns based on a plurality of gray image data collections, the measurement unit measures the display, The third measurement data collection of
The processing unit defines three final target curves, and the processing unit creates the three lookup tables based on the three final target curves and the three second native display curves; and
The processing unit converts the input video data collection into a calibration video data collection according to the three lookup tables, and the processing unit outputs the calibration video data collection to the display, and the calibration unit outputs the calibration video data collection to the display. Display calibration video based on video data collection,
Calibration system. The processing unit includes a signal generator, and the signal generator is coupled to the display and outputs a video data collection to the display.
The calibration system according to claim 10. The three primary color video data collections are a red video data collection, a green video data collection and a blue video data collection, respectively, and the three primary color patterns are a red pattern, a green pattern and a blue pattern, respectively. The display displays the red pattern based on the red video data collection, the display displays the green pattern based on the green video data collection, and the display displays the blue video data collection. Based on the blue pattern,
The calibration system according to claim 10. Each of the plurality of gray image data collections includes a first color subset collection, a second color subset collection, and a third color subset collection, and the first color subset collection, the second color subset collection, and the first color subset collection. The three pixel values of the three-color subset collection are equal.
The calibration system according to claim 10. The processing unit standardizes three second target curves to determine the three final target curves, and the processing unit converts the three first target curves to the three second target curves according to the conversion model. To
The calibration system according to claim 10. The processing unit zooms the three second target curves based on a ratio between a standard level of the three second target curves and a maximum value among the three maximum levels, and the three second target curves. Standardize the target curve,
The calibration system of claim 14. When the processing unit defines two first target curves out of the three first target curves, the processing unit includes other first target curves and the CIE xyY color space out of the three first target curves. Define based on three color values x, y, z
The calibration system of claim 14. The processing unit zooms a gamma curve based on a maximum level of one of the three first native display curves and defines the other first target curve;
The calibration system of claim 16. The other first target curve is a curve of the stimulus value Y in the CIE 1931 XYZ color space.
The calibration system of claim 17. The processing unit calculates a compensation ratio based on the conversion model and the three maximum levels of the three final target curves, and the processing unit increases the power of the light source of the display based on the compensation ratio. ,
The calibration system of claim 14.

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