TW379310B - Method and system for measuring the color characteristics of a video display monitor by eyes - Google Patents

Abstract

A Method and system of visual measurement of the color characteristics of monitors , which provides the gray scale for adjustment of the color to a neutral color scale and encountering the white point and also provides 2 patterns for different colors to get the non-linear reference value. Based on the results of the test, the display effect of the monitor is calibrated. The present invention can be operated solely by the image provided without utilizing other instruments or articles. In the testing process, An operation guide on the monitor is given and the user may use a mouse, a keyboard or other input devices for the operation. The system and the method allows unskilled users measure easily the color characteristics of the monitor easily and the adjusted monitor would meet the needs of the user while delivering the display effect demanded by the work environment.

Description

Printed by A7 _____B7_ of the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention () 1. Field of invention · The present invention is widely related to computer monitors using cathode ray tubes (CRT) ((: 0111 卩 1 ^ 61 * (^ 5? 1 & 7), especially the method and system for measuring color characteristics of a video display monitor. 2. BACKGROUND OF THE INVENTION The video display monitor is a heavy equipment of a computer system. The display can only provide correct image information. However, even if they belong to the same type of color display, the physical and electrical characteristics of each display device are not the same. Therefore, each display must be carried out under a specific lighting environment Measurement and correction of color. The color characteristics of the display include the chromaticity of the white point and the non-linearity between the voltage and output brightness of the CRT (η ο η 1 inearity). The two can be separated. Measure: The RGB color of the color on the left display is tristimulvs of that color. values), determined by the conversion, and the conversion between them can be expressed as R a 1 1 a 1 2 a 1 3 XG] = [a 2 1 a 2 2 a2 3] · 1 [Y] ⑴ B a 3 1 a 3 2 a 3 3 z

X = ^ -1 [Y 3 z Among them, RGB is a red, green, and blue color 値, which represents the display on the display 3. This paper size applies the Chinese National Standard (〇 Bi) 8 4 specifications (210 parent 297 mm > (Please read the “Notes on the back page” first to complete this page) .0 Pack. Order

Printed by A7 B7 _._ in the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economy . The matrix is determined by the color coordinates of phosphorus hers and the color coordinates of white point C. Generally, the color coordinates of phosphor are fixed when the display is manufactured. Therefore, the white point of the display determines the RGB of a color. "White point" can be adjusted by circuit hardware or software control. "White point color" The coordinate refers to a color coordinate β of a color that is considered white. Usually, the white point of the display is a color coordinate that adjusts RGB to equal. The white point is visually white, or neutral gray (neutral gray), that is, it has no color component visually. However, the color displayed by the white point of the display will be affected by the ambient light. Therefore, set the RGB of the display to the same value, and it may not be white or neutral gray on the sight. / In the conventional art, measuring the color coordinates of the white point of the display generally uses optical instruments such as a colorimeter (colofimeter), an optical instrument (photometer), or a spectroradiometer to measure the output of the display. Although measuring with optical instruments is accurate, it requires expensive and calibrated instruments, as well as the measurement environment and professional knowledge. Therefore, it is impossible for the average user of the display to perform the measurement or calibration by himself.

Engeldrum et al., In U.S. Patent No. 5,638,117, proposed another method, which uses a display to display a series of images for the user to compare with a matching card for calibration. Although this method dispenses with the measurement of optical instruments, it still requires an additional comparison card, which not only costs, but also has the risk of inconvenience caused by the missing ratio, so it is still not perfect. 4 This paper size applies Chinese National Standard (CNS) A4 (210X297 mm) (please read the precautions on the back before filling this page). Order Φ Printed by the Consumer Standards Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 5 Explanation of the invention () On the other hand, the non-linear characteristic of the display means the relationship between the voltage input to the display and the brightness displayed by the display. This relationship can be described as a power function, that is, brightness =. (Voltage +), and this relationship consists of two parameters such as α, which is called black level error, and r 値, which is a non-linear characteristic. Decide. There are two ways to display the non-linear characteristics of the display: parametric form and tabular form. The former is represented by 値 of α and r, and the latter is represented by multi-point coordinates (voltage, brightness) of the non-linear curve. This Both methods must measure a single point (voltage, brightness). The measurement method can use optical instruments, which are for each voltage. 値 Measure the brightness on the display 同样. Similarly, use optical instruments to measure the Disadvantages. In addition, the use of optical instruments for measurement is a hard-ware-based approch. However, color perception is a human ability, and any judgment of color comes from the final evaluation of human beings. Therefore, A better method is a measurement method and system based on human color perception rather than device dependence. 3. Objects of the invention and description One of the objects of the invention is to disclose a System and method for visually measuring white point of display. One object of the present invention is to propose a system and method for visually measuring display non-linear characteristic. One object of the present invention is to provide a system without optical instrument or reference. A method and system for measuring the color characteristics of a display by comparing objects. One of the objectives of the present invention is to provide a method for calibrating 5 paper sizes in a user's working environment. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) (please (Please read _ read the notes on the back before filling in this page)

Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () Method and system for positive display color characteristics 0 One object of the present invention is to provide a method and system for measuring display color characteristics using a mouse with a spine . According to the present invention, a system for visually measuring the color characteristics of a display includes an image for adjusting its color to look like a neutral gray step, thereby obtaining the white point of the display; the first and second patterns are for adjusting its brightness to make the pattern disappear In the background, the non-linear reference 値 of the first color of the display is obtained; the third and fourth patterns are used to adjust the brightness so that the pattern disappears in the background to obtain the non-linear reference 値 of the second color of the display; and The fifth and sixth patterns are used to adjust the brightness so that the pattern disappears into the background, so as to obtain the non-linear reference frame of the third color of the display. In the embodiment of the present invention, a method for measuring the color characteristics of a display by visual inspection is provided by a computer to provide a gray step. The user adjusts the color to a neutral gray step, thereby finding a white point and providing two patterns for different colors. To obtain a non-linear reference 値. The computer can correct the display of the monitor by itself based on these measurements. With the following embodiments and the accompanying drawings, it will be easier to understand the content and features of the present invention. 4. Brief description of the drawings 4-1 Brief description of the drawings. The first diagram is a schematic diagram of a gray ladder. The second image is a schematic diagram of finding a white point. The third diagram is a schematic diagram of the non-linear reference chirp of the measurement display. 4-2 Description of drawing number 6 This paper size applies Chinese National Standard (CNS) A4 specification (21〇 > < 297mm) (please read the notes on the back first and fill in the same)

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1 2 Gray Ladder 1 6 Instruction 20 Background Printed by the Consumers Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () 1 0 Display 14 Background 18 Press 2 2 Pattern 5. Detailed description The invention is based on lighting. The environment allows users to visually measure the color characteristics of the display, and the computer then uses the measurement to correct the display. The user can perform these measurement operations in the working environment, so the calibrated display completely meets the user's working environment conditions. When the working environment changes, the monitor can be recalibrated. All measurement operations depend on the computer itself, and the user operates on the monitor based on the image provided by the computer > No other instruments or items are required. During the measurement, the computer provides operating instructions on the display at the same time, and the user uses the mouse, keyboard, or other input devices to operate. Finally, the computer will calibrate the display itself based on the measurement results. [Adjust Brightness and Contrast Settings] Use the monitor's screen to adjust brightness and contrast settings. First adjust the contrast setting to the user's favorite setting. Then increase the brightness setting to full scale, and adjust the horizontal and vertical sizes to make the display screen margins appear. Lower the brightness setting again until the edges disappear. Adjust the size and position of the horizontal and vertical dimensions according to the user's preference. The brightness setting is no longer changed after this. [Finding the White Point] Let KXiYlZr) denote a triple excitation 値 with a reference white point. 7 This paper uses Chinese National Standard (CNS) A4 (210 X 297 mm) [[Please read the precautions on the back before filling in this page]

A7 ____B7_ V. Description of the invention () The selection of the white point R in this test is the three white incentives for the desired performance, such as the white point in the image. Finding a white point refers to finding the display R G B 使得 caused by C *, that is, SL, which is white in visual perception. [The relationship with ^ is expressed as Δ__ 1 c * H (2) Use the display to display an image called gray ramp # (gray ramp), the so-called gray step image is a rectangle containing 6 adjacent squares, such as the first As shown in the figure, it is a gray color with 6 different brightness at the reference white point. According to formula (1), for a display with a fixed phosphorus color coordinate, adjusting C of C * changes the displayed RGB. As shown in the second figure, the present invention provides a gray step 12 on the display screen 10 for the user to adjust (C *) until the gray step 12 appears neutral. A neutral gray ladder is a gray ladder that is gray to the viewer. On the display screen 10, in addition to the gray steps 12 in the background 14, there are instructions 16 and buttons 18 to provide user guidance and adjustment operations, respectively. After the user adjusts to obtain a neutral gray step, the system can obtain a white point based on C * in (2). [Reference 2 measurement group] Printed by the Consumer Cooperatives of the Central Bureau of Standards, Ministry of Economic Affairs (please read the precautions on the back before filling out this page) The present invention is a halftone image comparison method. The basic principle is to generate some For images with known brightness, for another image with a known voltage and unknown brightness, find the image with the closest brightness from the previous image to get a set of (voltage, brightness) 値. For thoughts on halftone development, you can refer to, for example, "0; § 巳 1 巳 1 image" published by RC Gonzalez and RE Woods in 1992 < 1 (118〇11- \ ¥ 6816 > | 1 "Processing" for further understanding. 8 This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm). Printed by A7 _B7 _._ in the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. ) Brightness and voltage are usually given a scale ranging from 0 to 1. When the voltage is at the maximum scale, the brightness is also at the maximum scale. Brightness is not affected by non-linearity only when the voltage is 0 or 1. In other words, the display has two levels (0 and 1) that are not affected by non-linear characteristics, and its brightness is correct. Select two different voltages and measure their corresponding brightness to obtain two sets (voltage, brightness) reference进而, then according to these two sets of reference 求 to obtain α and r by mathematical methods, we know its non-linear characteristics. Preferably, the two different voltages selected are close to 0 and 1, respectively. The method of measuring reference 値 in the present invention As shown in the third figure, the system The system provides a background 20 and a pattern 22 on the display screen 10, and then the user adjusts the brightness of the pattern 22 until it disappears in the background 20 to obtain a set of reference frames. Similarly, the system provides different patterns through the above-mentioned Baitong Operation, you can get the second set of reference 値. Repeat the previous steps for the three colors of red, green, and blue, and obtain the reference 値 of the two sisters of three colors. In the same way, during these measurements, the system also provides instructions 16 and buttons 18 to facilitate user operation. Preferably, the user uses a mouse to perform input operations, but it is also feasible to use other input devices, such as a keyboard. . Using the method of image comparison, the operation process is relatively simple and fast without the use of additional instruments, and it can provide complete instructions and guidance using the display, which is very suitable for general users. To summarize the above process, its steps can be expressed as follows · -Step 1: Use the monitor's screen to adjust the brightness and contrast settings "9 This paper size applies to Chinese national standards (CN S) A4 size (210X297mm) (Please read the notes on the back before filling this page)

Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 _B7_ V. Description of the Invention () Step 2: Adjust the color of an image to make it look like a neutral gray wax ladder. Step 3: Adjust the brightness of the first pattern so that it disappears into the background. Step 4: Adjust the brightness of the second pattern so that it disappears into the background. Step 5 ·· Adjust the brightness of the third pattern so that it disappears into the background "Step 0: Adjust the brightness of the fourth pattern so that it disappears into the background. Step 7: Adjust the brightness of the fifth pattern so that it disappears into the background. Step 8: Adjust the brightness of the sixth pattern so that it disappears from the background. In the above process, Step 2 is to find the white point. Step 3 and Step 4 are for the non-linear reference of red. Step 5 and Step Series 6 provides a green non-linear reference frame, and steps 7 and 8 provide a blue non-linear reference frame. The system can self-calibrate according to the halo measurement results, so that the color characteristics of the mouse display achieve the best state for the user in the environment. Those skilled in the art should understand that the above process is only a preferred embodiment, and the sequence of steps is not absolute. For example, the procedure for finding white points (the aforementioned step 2) can measure the non-linear reference 値 (the aforementioned steps 3 to Step 8) is completed after completion. This system and method allow users without professional knowledge to easily measure the color characteristics of the display by themselves, and the corrected display provides the display effect that best suits the test and working environment. The above descriptions illustrate the features of the present invention through the embodiments, and the purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly, rather than to limit the patent scope of the present invention. For those skilled in the art, it is easy to modify the above embodiments without departing from the spirit disclosed by the present invention. Therefore, the present invention should be determined according to the scope of patent application described below. 10 This paper is again applicable to China National Standard (CNS) A4 (210X297 mm) (Please read the precautions on the back before filling this page)

Printed by the Consumers' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs A8 Βδ C8 D8 6. Scope of patent application 1. A method of visually measuring the color characteristics of a display ... The measurement process is performed in a lighted environment. The method includes the following : Provide an image for adjusting its color to look like a neutral gray staircase to obtain the white point of the display; provide the first and second patterns to adjust the brightness so that the pattern disappears into the background, so as to obtain the display A color non-linear reference card; providing third and fourth patterns for adjusting its brightness so that the case disappears into the background, so as to obtain the second β color non-linear reference card of the display; and providing fifth and The sound six pattern is used to adjust its brightness so that the pattern disappears into the background, so as to obtain the non-linear reference frame of the third color of the display. 2. The method described in item 1 of the scope of patent application, further includes the steps of adjusting the brightness and contrast settings using the screen of the display before finding the white point. 3. The method as described in item 2 of the scope of the patent application, wherein the steps of adjusting the brightness and contrast settings include: adjusting the contrast setting to the user's favorite setting; increasing the brightness setting to the maximum level, and adjusting the level and The size of the vertical dimension causes horizontal and vertical edges to appear; lower the brightness setting until the edges disappear; and adjust the size and position of the leech and vertical dimensions according to the user's preference. 4. The method according to item 1 of the patent application, wherein the first to third colors are red, green, and blue. 5. The method described in item 1 of the scope of patent application, including the display guide Η This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page)

Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs of the ABCD. 6. Scope of Patent Application Orders and buttons provide user guidance and operators for adjustment, respectively. 6. The method according to item 5 of the scope of patent application, wherein the user's operation is performed by a mouse. 7. —A method for visually correcting the color characteristics of a display, including the following steps: providing light; providing an image for adjusting its color to look like a neutral gray level #, so as to obtain the white point of the display; providing the first points respectively And the second pattern for adjusting the brightness so that the pattern disappears into the background, so as to obtain the non-linear reference 第一 of the first color of the display; providing the third and fourth patterns respectively for adjusting the brightness so that the pattern disappears into the background, so as to obtain Obtain the display's second color i non-linear reference k; k is used for the fifth and sixth patterns to adjust its brightness so that the pattern disappears into the background, so as to obtain the non-linear reference 値 of the display's third color; and according to the obtained white The dots and the non-linear reference of the first to third colors are corrected for the display. 8. The method described in item 7 of the scope of patent application, including the steps of adjusting the brightness and contrast settings using the screen of the display before all the steps. 9 · As described in item 8 of the scope of the patent application; method; wherein the steps of adjusting the brightness and contrast settings include: ironing the contrast setting to the user's favorite setting; increasing the brightness setting to the maximum value, And adjust the horizontal and vertical size of the large 12 This standard is applicable to China National Standard (CNS) Α4 specifications (210X297 mm) (Please read the precautions on the back before filling this page) f • f. A8 B8 C8 D8 VI. Application The patent scope is small so that horizontal and vertical size edges appear; lower the brightness setting until the edges disappear; and adjust the size and position of the horizontal and vertical sizes according to the user's preference. 10. The method described in item 7 of the scope of patent application, wherein the first to third colors are red, green, and blue. 1 1. The method described in item 7 of the scope of patent application, more tantalum bracket display The instructions and buttons provide users with instructions and operators for sewing adjustment, respectively. 12. The method according to item 7 of the scope of patent application, wherein the operation of the user is performed by using a mouse. 1 3 .- A system for visually measuring the color characteristics of a display. The measurement process is performed in a lighted environment. The system includes: I · A video camera for adjusting its color to look like a neutral gray step, The white point of the display is obtained; the first and second patterns are used to adjust the brightness so that the case disappears into the background, so as to obtain the non-linear reference 第一 of the first color of the display; the third and fourth patterns are changed and adjusted The bright match pattern disappears in the background to obtain the non-linear reference 第二 of the second color of the display; and the fifth and sixth patterns are adjusted for brightness and the pattern disappears in the background to obtain the third color of the display. Non-linear reference 値. Printed by the Men ’s Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the notes on the back before filling this page) 14. For the system described in item 13 of the scope of patent application, the images and patterns covered are provided by the display "" 15. The system described in item 13 of the scope of patent application, including operators who provide instructions and adjustments to the user, respectively, by instructions and series. 1 6, — A method of measuring the white point of the display by visual inspection. The paper size is applicable to China National Standard (CNS) A4 (210X297 mm) A8-88 D8. The method includes: providing an image for adjusting each color to make it look like a neutral gray staircase, so as to obtain the white point of the indicator. 1 7. A method for visually measuring the color non-linearity of a display. The measurement process is performed in a reading environment with light. The method includes the following steps: First and second patterns are provided for adjusting the brightness and the pattern, respectively. Disappear in the background to obtain the non-linear reference of the first color of the display; provide the third and fourth patterns respectively to adjust its bright children so that the pattern disappears into the background to obtain the non-linearity of the second color of the display. The linear reference frame; and the fifth and sixth cases are provided for adjusting the brightness so that the pattern disappears in the threat scene, so as to obtain the non-linear parameter of the third color of the display # 値 6 1 8. The square zinc according to item 7, wherein the first to third colors are red, green, and blue. (Please read the notes on the back before filling in this page) Φ, order.

I I Printed by the Central Standards Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 14 This paper size applies to China National Standard (CNS) A4 (210X297 mm)