JP3973827B2 - Color adjustment method and apparatus - Google Patents

Color adjustment method and apparatus Download PDF

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JP3973827B2
JP3973827B2 JP2000245942A JP2000245942A JP3973827B2 JP 3973827 B2 JP3973827 B2 JP 3973827B2 JP 2000245942 A JP2000245942 A JP 2000245942A JP 2000245942 A JP2000245942 A JP 2000245942A JP 3973827 B2 JP3973827 B2 JP 3973827B2
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adjustment
color
image
color information
area
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JP2002064842A (en
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孝 清水
豊 荒井
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Sharp NEC Display Solutions Ltd
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NEC Display Solutions Ltd
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  • Image Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Processing Of Color Television Signals (AREA)
  • Color Image Communication Systems (AREA)
  • Controls And Circuits For Display Device (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、パーソナルコンピュータなどの映像信号を表示する画像表示装置の色調整方法に係り、特に複数の色についてそれぞれ独立に調整可能な画像表示装置の色調整方法に関する。
【０００２】
【従来の技術】
近年、液晶モニタやノートパソコン、平面ＴＶなど液晶パネルやプラズマディスプレイを使用した表示装置が急速に普及し、市場からの要求のもと高精細化や高画質化が進んでいる。同時にマルチメディア化の流れから液晶モニタで動画を表示したときの色合い調整やプリンタで印刷した際の色合わせなどの対応をするため、従来からある３原色（赤，緑，青）を独立に調整するだけでなく、より高度な色調整機能を持つ画像表示装置が提案されている。
【０００３】
たとえば、公開特許公報（特開平１１−３０８４７２）では、赤、青、緑、イエロー、シアン、マゼンダの６つの色相と各色相間領域において特定の色相および色相間領域のみを、他の色相に影響を与えることなく調整する装置を実現している。しかし実際に異なる表示特性の液晶パネルの色合いを合わせたり、プリンタの出力画像との色合わせを行う場合において、視覚的に違和感の無い色調整を行なうには原色から中間色まで非常に多くの色、例えば５０色以上について調整を行う必要がある。
【０００４】
従来この色調整を自動化する場合は、図４に示すような方法がとられていた。この図において、制御部３１が調整用画像信号として特定の色、例えば全画面赤一色の映像信号を表示装置３２に出力する。ＲＧＢセンサ３３は画面上の色情報を検出し、Ａ／Ｄコンバータ３４でデジタル信号に変換し制御部３１に出力する。制御部３１は得られた色情報の値を理論値と比較し、同じ値になるように表示装置３２の色調整を制御する。この制御を、調整用画像信号の色を順次変えて約５０色以上について繰り返し行うことにより、異なる表示特性の液晶パネルの色合わせやプリンタの出力画像との色合わせを行う。
【０００５】
【発明が解決しようとする課題】
しかしながら、従来の色調整方法では、多数の色についての調整作業を１色ずつ順に行なっていたため、自動化しても非常に時間がかかるという問題があった。
【０００６】
本発明は、上記問題点に鑑みてなされたもので、その目的は、多数の色についての調整作業を短時間で行う色調整方法を提供することにある。
【０００７】
【課題を解決するための手段】
請求項１記載の発明は、画像表示装置の表示画面に表示される画像の複数の色に対して独立して色調整が可能な色調整方法において、前記表示画面に含まれる複数の領域の各々に対して異なる色情報を有する調整用画像を出力する調整用画像出力過程と、この調整用画像出力過程で出力された画像により表示された画像全体を取り込み、取り込んだ画像全体から前記各領域の色情報を検出する色情報検出過程と、この色情報検出過程で検出された各領域の色情報と、対応する各領域の前記調整用画像の色情報の理論値であって所定の補正値により補正された理論値とが等しくなるように色調整を行う色調整過程とを有し、前記所定の補正値は、前記各領域間で生じる色情報の差分に相当する値であって、前記各領域のすべてに同一色の調整用画像を表示させた場合に所定の一領域を前記調整用画像の色情報と一致するように色調整した場合に他の領域にそれぞれ生じる色情報の値と、前記調整用画像の色情報の理論値との差であることを特徴とする色調整方法である。
【０００８】
請求項２に記載の発明は、前記所定の一領域は、前記表示画面の中央部分の領域であることを特徴とする請求項１に記載の色調整方法である。
【０００９】
請求項３に記載の発明は、前記同一色の調整用画像は、白色の調整用画像であることを特徴とする請求項１又は２に記載の色調整方法である。
【００１０】
請求項４に記載の発明は、画像表示装置の表示画面に表示される複数の色をそれぞれ独立に調整する色調整装置において、前記表示画面に含まれる複数の領域の各々に対して異なる色情報を有する調整用画像を出力する調整用画像出力部と、この調整用画像出力部から出力された画像により表示された画像全体を取り込み、取り込んだ画像全体から前記各領域の色情報を検出する色情報検出部と、この色情報検出部に検出された各領域の色情報と、対応する各領域の前記調整用画像の色情報の理論値であって所定の補正値により補正された理論値とが等しくなるように色調整を行う色調整部とを備え、前記所定の補正値は、前記各領域間で生じる色情報の差分に相当する値であって、前記各領域のすべてに同一色の調整用画像を表示させた場合に所定の一領域を前記調整用画像の色情報と一致するように色調整した場合に他の領域にそれぞれ生じる色情報の値と、前記調整用画像の色情報の理論値との差であることを特徴とする色調整装置である。
【００１１】
請求項５に記載の発明は、前記所定の一領域は、前記表示画面の中央部分の領域であることを特徴とする請求項４に記載の色調整装置である。
【００１２】
請求項６に記載の発明は、前記同一色の調整用画像は、白色の調整用画像であることを特徴とする請求項４又は５に記載の色調整装置である。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照して説明する。
図１は本実施の形態による色調整装置の構成を示した図である。図１において、表示画面の複数の色に対して独立して色調整が可能な、例えば、赤、緑、青の各々独立したゲイン調整だけでなく、その中間色も独立に調整可能な画像表示装置１１と、前記画像表示装置１１の映像情報を取得するＲＧＢセンサ１２と、前記ＲＧＢセンサ１２で取得した画像を図２に示すような所定の領域、後で説明する調整用画像信号に応じた領域に分割し、上記各領域の色情報をデジタル信号に変換する色情報検出部１３と、上記画像表示装置１１に表示させる調整用画像信号を出力し、かつ上記色情報検出部１３からのデジタル信号に変換された各領域の色情報の値と当該各領域に対応する調整用画像信号の色情報の理論値とが等しくなるように画像表示装置１１の色調整を制御する制御部１４とから構成される。
【００１４】
次に、本発明の実施の形態による色調整方法の動作を、図３を参照して詳細に説明する。図３は本実施の形態による色調整方法の動作を示したフローチャートである。
まず制御部１４は調整用画像信号として全画面が単一色、例えば全画面白色の画像信号を出力して画像表示装置１１に表示させる（ステップＳ１）。色情報検出部１３はＲＧＢセンサ１２で取得した画像表示装置１１の表示画面に表示された画像を所定の領域、例えば図２に示すようなｍ画素×ｎラインで示される領域、この図の場合は２５の領域に分割し、各領域の色情報をデジタル信号に変換する（ステップＳ２）。制御部１４は実用において最も重要な上記表示画面の中央部分の領域、例えば図２の領域Ｃの部分の色情報が、調整用画像信号の白色と等しい色情報（理論値）となるように画像表示装置１１の色調整を制御する（ステップＳ３）。上記色調整の制御完了後、再度色情報検出部１３により各領域の色情報を測定し（ステップＳ４）、制御部１４は各領域の色情報と上記調整用画像信号の色情報（調整用画像信号本来の色情報（色温度））との差（色ずれ）の算出を行ない、当該算出された値を各領域の補正値として保持する（ステップＳ５）。次に制御部１４は調整用画像信号として上記各領域ごとに異なる色を出力して画像表示装置１１に表示させる（ステップＳ６）。色情報検出部１３は上記ステップＳ２の動作と同様に各領域の色情報をデジタル信号に変換して制御部１４に出力する（ステップＳ７）。制御部１４は各領域の色情報の値とと、当該領域に対応する調整用画像信号の色情報の理論値を上記補正値で補正した値とが等しくなるように、画像表示装置１１の色調整を制御する（ステップＳ８）。すべての領域についてステップＳ８の動作を繰り返して調整作業を完了する（ステップＳ９）。
【００１５】
また、ステップＳ３において、画面中央部を理論値（最適）に調整するのではなく、各領域の理論値と差（色ずれ）を小さくする、例えば各領域の色ずれの平均値を最小にしたり、各領域の色ずれの値の最大値を小さくするように制御部１４が画像表示装置１１の色調整を制御することにより、ユーザに色ずれを感じさせることを低減する効果が得られる。
【００１６】
【発明の効果】
以上説明したように、本発明の画像表示装置の色調整方法によれば、多数の色についての色調整を、表示画面の色ずれの補正を含み、短時間で行うことができる。
【図面の簡単な説明】
【図１】 本実施の形態による色調整装置の構成を示すブロック図である。
【図２】 本実施の形態による表示画面の各領域の態様を示す図ある。
【図３】 本実施の形態による色調整方法の動作を示したフローチャートである。
【図４】 従来技術による画像表示装置の色調整方法が適用されたシステムの構成図である。
【符号の説明】
１１ 画像表示装置
１２ ＲＧＢセンサ
１３ 色情報検出部
１４ 制御部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color adjustment method for an image display apparatus that displays a video signal such as a personal computer, and more particularly to a color adjustment method for an image display apparatus that can independently adjust a plurality of colors.
[0002]
[Prior art]
In recent years, display devices using a liquid crystal panel and a plasma display such as a liquid crystal monitor, a notebook computer, and a flat-screen TV have been rapidly spread, and high definition and high image quality have been promoted in response to a demand from the market. At the same time, the three primary colors (red, green, and blue) have been adjusted independently in order to support color adjustments when moving images are displayed on the LCD monitor and color adjustments when printed with a printer. In addition, image display devices having more advanced color adjustment functions have been proposed.
[0003]
For example, in Japanese Patent Laid-Open No. 11-308472, six hues of red, blue, green, yellow, cyan, and magenta and only a specific hue and an inter-hue area in each hue area are affected by other hues. The device that adjusts without giving is realized. However, when adjusting the color of the liquid crystal panel with different display characteristics or color matching with the output image of the printer, a very large number of colors from primary colors to intermediate colors can be used to make color adjustments that are not visually uncomfortable. For example, it is necessary to adjust for 50 colors or more.
[0004]
Conventionally, when this color adjustment is automated, a method as shown in FIG. 4 has been employed. In this figure, the control unit 31 outputs a video signal of a specific color, for example, a full-screen red color, to the display device 32 as an adjustment image signal. The RGB sensor 33 detects color information on the screen, converts it to a digital signal by the A / D converter 34, and outputs it to the control unit 31. The control unit 31 compares the obtained color information value with the theoretical value, and controls the color adjustment of the display device 32 so as to be the same value. This control is repeated for about 50 colors or more by sequentially changing the color of the adjustment image signal, thereby performing color matching of the liquid crystal panel having different display characteristics and color matching with the output image of the printer.
[0005]
[Problems to be solved by the invention]
However, in the conventional color adjustment method, since the adjustment work for a large number of colors is sequentially performed one by one, there is a problem that it takes a very long time even if it is automated.
[0006]
The present invention has been made in view of the above problems, and an object thereof is to provide a color adjustment method for performing an adjustment operation for a large number of colors in a short time.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, in the color adjustment method capable of independently performing color adjustment on a plurality of colors of an image displayed on the display screen of the image display device, each of the plurality of regions included in the display screen. An adjustment image output process for outputting an adjustment image having different color information, and an entire image displayed by the image output in the adjustment image output process . a color information detecting step for detecting color information, and color information of each area detected by the color information detecting step, by a predetermined correction value to a theoretical value of color information of the corresponding adjustment image for each area A color adjustment process for performing color adjustment so that the corrected theoretical value becomes equal , and the predetermined correction value is a value corresponding to a difference in color information generated between the regions, For the same color adjustment in all areas When an image is displayed, the color information value generated in each of the other areas when color adjustment is performed so that the predetermined area matches the color information of the adjustment image, and the theory of the color information of the adjustment image It is a color adjustment method characterized by being a difference from a value .
[0008]
The invention according to claim 2 is the color adjustment method according to claim 1 , wherein the predetermined one region is a region of a central portion of the display screen.
[0009]
The invention according to claim 3 is the color adjustment method according to claim 1 or 2 , wherein the adjustment image of the same color is a white adjustment image.
[0010]
According to a fourth aspect of the present invention, in the color adjustment device that independently adjusts a plurality of colors displayed on the display screen of the image display device, different color information for each of the plurality of regions included in the display screen. An adjustment image output unit that outputs an adjustment image having a color, and a color that captures the entire image displayed by the image output from the adjustment image output unit, and detects color information of each region from the entire captured image An information detection unit; color information of each area detected by the color information detection unit; a theoretical value of color information of the image for adjustment in each corresponding area, and a theoretical value corrected by a predetermined correction value ; And a color adjustment unit that performs color adjustment so that the two are equal to each other, and the predetermined correction value is a value corresponding to a difference in color information generated between the regions, and the same color is applied to all the regions. When the adjustment image is displayed Is the difference between the value of the color information respectively generated in another area when color adjustment to a predetermined one region matches the color information of the adjustment image, the theoretical value of the color information of the adjustment image to The color adjusting device is characterized by the above.
[0011]
The invention according to claim 5 is the color adjustment apparatus according to claim 4 , wherein the predetermined one region is a region of a central portion of the display screen.
[0012]
The invention according to claim 6 is the color adjustment apparatus according to claim 4 or 5 , wherein the adjustment image of the same color is a white adjustment image.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a color adjustment apparatus according to the present embodiment. In FIG. 1, an image display device capable of independently adjusting colors for a plurality of colors on the display screen, for example, not only independently adjusting gains of red, green, and blue, but also independently adjusting intermediate colors thereof. 11, an RGB sensor 12 that acquires video information of the image display device 11, an image acquired by the RGB sensor 12, a predetermined area as shown in FIG. 2, an area corresponding to an adjustment image signal described later The color information detection unit 13 that converts the color information of each region into a digital signal, the adjustment image signal to be displayed on the image display device 11, and the digital signal from the color information detection unit 13 And a control unit 14 that controls the color adjustment of the image display device 11 so that the color information value of each area converted into the color information and the theoretical value of the color information of the image signal for adjustment corresponding to each area become equal. Is done.
[0014]
Next, the operation of the color adjustment method according to the embodiment of the present invention will be described in detail with reference to FIG. FIG. 3 is a flowchart showing the operation of the color adjustment method according to this embodiment.
First, the control unit 14 outputs an image signal having a single color, for example, a white color on the entire screen, as the adjustment image signal, and displays it on the image display device 11 (step S1). The color information detection unit 13 displays an image displayed on the display screen of the image display device 11 acquired by the RGB sensor 12 in a predetermined area, for example, an area indicated by m pixels × n lines as shown in FIG. Is divided into 25 areas, and the color information of each area is converted into a digital signal (step S2). The control unit 14 displays the image so that the color information (theoretical value) equal to the white color of the image signal for adjustment is the color information of the central portion of the display screen, which is the most important in practical use, for example, the portion of the region C in FIG. Color adjustment of the display device 11 is controlled (step S3). After completion of the color adjustment control, the color information detection unit 13 measures the color information of each area again (step S4), and the control unit 14 determines the color information of each area and the color information of the adjustment image signal (adjustment image). The difference (color shift) from the original color information (color temperature) of the signal is calculated, and the calculated value is held as a correction value for each region (step S5). Next, the control unit 14 outputs a different color for each region as an adjustment image signal and displays it on the image display device 11 (step S6). The color information detection unit 13 converts the color information of each region into a digital signal and outputs the digital signal to the control unit 14 in the same manner as the operation in step S2 (step S7). The control unit 14 adjusts the color of the image display device 11 so that the value of the color information of each area is equal to the value obtained by correcting the theoretical value of the color information of the image signal for adjustment corresponding to the area with the correction value. The adjustment is controlled (step S8). The adjustment operation is completed by repeating the operation of step S8 for all regions (step S9).
[0015]
In step S3, the central portion of the screen is not adjusted to the theoretical value (optimal), but the difference (color shift) from the theoretical value of each area is reduced, for example, the average value of color shift in each area is minimized. The control unit 14 controls the color adjustment of the image display device 11 so as to reduce the maximum value of the color misregistration value in each region, thereby obtaining an effect of reducing the user's feeling of color misregistration.
[0016]
【The invention's effect】
As described above, according to the color adjustment method of the image display apparatus of the present invention, color adjustment for a large number of colors can be performed in a short time, including correction of color misregistration on the display screen.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a color adjustment apparatus according to an embodiment.
FIG. 2 is a diagram showing an aspect of each area of a display screen according to the present embodiment.
FIG. 3 is a flowchart showing the operation of the color adjustment method according to the present embodiment.
FIG. 4 is a configuration diagram of a system to which a color adjustment method for an image display device according to a conventional technique is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Image display apparatus 12 RGB sensor 13 Color information detection part 14 Control part

Claims (6)

画像表示装置の表示画面に表示される画像の複数の色に対して独立して色調整が可能な色調整方法において、
前記表示画面に含まれる複数の領域の各々に対して異なる色情報を有する調整用画像を出力する調整用画像出力過程と、
この調整用画像出力過程で出力された画像により表示された画像全体を取り込み、取り込んだ画像全体から前記各領域の色情報を検出する色情報検出過程と、
この色情報検出過程で検出された各領域の色情報と、対応する各領域の前記調整用画像の色情報の理論値であって所定の補正値により補正された理論値とが等しくなるように色調整を行う色調整過程とを有し、
前記所定の補正値は、前記各領域間で生じる色情報の差分に相当する値であって、前記各領域のすべてに同一色の調整用画像を表示させた場合に所定の一領域を前記調整用画像の色情報と一致するように色調整した場合に他の領域にそれぞれ生じる色情報の値と、前記調整用画像の色情報の理論値との差であることを特徴とする色調整方法。In a color adjustment method capable of color adjustment independently for a plurality of colors of an image displayed on a display screen of an image display device,
And adjusting an image output step of outputting the adjustment image having a different color information for each of a plurality of areas included in the display screen,
A color information detection process for capturing the entire image displayed by the image output in the image output process for adjustment, and detecting color information of each region from the entire captured image;
The color information of each area detected in this color information detection process is equal to the theoretical value of the color information of the image for adjustment in each corresponding area and corrected by a predetermined correction value. A color adjustment process for performing color adjustment ,
The predetermined correction value is a value corresponding to a difference in color information generated between the areas, and the predetermined area is adjusted when the adjustment image of the same color is displayed in all the areas. A color adjustment method characterized by a difference between a color information value generated in each of the other areas when color adjustment is performed so as to match the color information of the image for adjustment and a theoretical value of the color information of the image for adjustment . 前記所定の一領域は、前記表示画面の中央部分の領域であることを特徴とする請求項１に記載の色調整方法。  The color adjustment method according to claim 1, wherein the predetermined area is an area of a central portion of the display screen. 前記同一色の調整用画像は、白色の調整用画像であることを特徴とする請求項１又は２に記載の色調整方法。  The color adjustment method according to claim 1, wherein the adjustment image of the same color is a white adjustment image. 画像表示装置の表示画面に表示される複数の色をそれぞれ独立に調整する色調整装置において、
前記表示画面に含まれる複数の領域の各々に対して異なる色情報を有する調整用画像を出力する調整用画像出力部と、
この調整用画像出力部から出力された画像により表示された画像全体を取り込み、取り込んだ画像全体から前記各領域の色情報を検出する色情報検出部と、
この色情報検出部に検出された各領域の色情報と、対応する各領域の前記調整用画像の色情報の理論値であって所定の補正値により補正された理論値とが等しくなるように色調整を行う色調整部とを備え、
前記所定の補正値は、前記各領域間で生じる色情報の差分に相当する値であって、前記各領域のすべてに同一色の調整用画像を表示させた場合に所定の一領域を前記調整用画像の色情報と一致するように色調整した場合に他の領域にそれぞれ生じる色情報の値と、前記調整用画像の色情報の理論値との差であることを特徴とする色調整装置。In a color adjustment device that independently adjusts a plurality of colors displayed on a display screen of an image display device,
An adjustment image output unit that outputs an adjustment image having different color information for each of a plurality of regions included in the display screen;
A color information detection unit that captures the entire image displayed by the image output from the adjustment image output unit, and detects color information of each region from the entire captured image;
The color information of each area detected by the color information detection unit is equal to the theoretical value of the color information of the image for adjustment in each corresponding area and corrected by a predetermined correction value. A color adjustment unit for color adjustment ,
The predetermined correction value is a value corresponding to a difference in color information generated between the areas, and the predetermined area is adjusted when the adjustment image of the same color is displayed in all the areas. A color adjustment device characterized by a difference between a color information value generated in each of other areas when color adjustment is performed so as to match the color information of the adjustment image and a theoretical value of the color information of the adjustment image . 前記所定の一領域は、前記表示画面の中央部分の領域であることを特徴とする請求項４に記載の色調整装置。  The color adjustment apparatus according to claim 4, wherein the predetermined area is an area of a central portion of the display screen. 前記同一色の調整用画像は、白色の調整用画像であることを特徴とする請求項４又は５に記載の色調整装置。  The color adjustment apparatus according to claim 4, wherein the adjustment image of the same color is a white adjustment image.
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