JP2019146116A - Color sharing device for multipoint monitor - Google Patents

Abstract

To share colors of a monitor among many points.SOLUTION: A color sharing device 1 for a multi-point monitor includes: a first lens 3 for drawing light from a specific region 22 of a display surface 21 of a monitor 2; a second lens 4 for drawing illumination light; a spectroscope 5 for measuring light from the first lens 3, outputting a first spectrum, and outputting a second spectrum obtained by measuring the illumination light from the second lens 4; a measurement unit 6 near the screen of the monitor 2; and a computer connected to the measurement unit, the computer inputting data from the spectroscope 5 and storing an XYZ value. The computer includes: a calibration part for adjusting a difference in chromaticity of the monitor 2 with reference to the first spectrum; an illumination light correction unit for correcting illumination light by different illumination light with reference to the second spectrum; and a sharing operator for operating the shared XYZ value based on the color temperature of the illumination light used for imaging an object and an RGB image or an XYZ image acquired by the imaging.SELECTED DRAWING: Figure 2

Description

  The present invention makes it possible to perform color management when the location and time at which an image is captured is different and the monitor model for displaying the captured image is different, and the color reproducibility of the monitor deteriorates with time, which has been difficult in the past. The present invention relates to a color sharing device for a multi-point monitor that corrects the above.

  Japanese Patent Application Laid-Open No. H10-228688 discloses an invention related to the deterioration of color reproducibility over time. The calibration device disclosed in Patent Literature 1 is a calibration device that calibrates the image display device based on a measurement value obtained by a measurement unit that optically measures an image displayed on the image display device. A patch image of a predetermined color is displayed on the image display device after being broken, a calculation means for calculating a hue difference between a measurement value by the measurement means and a target value at that time, and the calculation means calculated by the calculation means There is disclosed a calibration device including a control unit that executes the calibration again when the hue difference exceeds a threshold value.

  In Patent Document 2, even if the time zone and place of product imaging differ, a color fidelity ambient light correction device and a color fidelity ambient light correction method that accurately provide color fidelity information to the user and prevent product selection mismatch Techniques related to this are disclosed.

JP 2013-219557 A JP2015-179915A

  Production of industrial products and parts is carried out at various locations in Japan and worldwide due to the ease of location and convenience of market access, and accordingly, business establishments are located in various locations in Japan and around the world. Under such circumstances, when managing the color of products, there are many manufacturers and various specifications for cameras and monitors, and cameras and monitors from various manufacturers are used. When the product image is displayed on the monitor, the color gamut of the camera or monitor is different or the illumination light is different, so the product image color varies at multiple points, making it difficult to control the product color quality. is there

  One of the reasons why product colors cannot be managed accurately at multiple locations is that the type of monitor that reproduces the product image is different, and the color reproduction function deteriorates over time. There are times when it becomes impossible to demonstrate.

  If the monitor has a calibration function, the color will appear stably, but the general monitor does not have such a calibration function, so if the monitor is turned on from morning to evening, the color difference ΔE of the monitor will change. The color difference ΔE may be different by 2 or more. If it is an inexpensive monitor of an ordinary inexpensive personal computer, the color changes at all, and the color difference ΔE may be larger than 2 at least within one day. If so, the color appearance of the product will change completely. Even with the same ambient lighting, the performance of the monitor itself will change. It is necessary to calibrate the monitor at an appropriate time interval, for example, once an hour.

  Under the circumstances where corporate offices and factories are expanding not only in various parts of the country but also overseas, the time and place where the product was imaged differed. In various places in the world, such as the United States and Europe, and if the time is different, the lighting conditions will also be different, so the way they look is unavoidable. There is a demand for a device that has both the function of periodically calibrating the monitor and reading the ambient light. Cameras and monitors used by companies are generally not the same manufacturer or model, and various color gamuts such as RGB, sRGB, Adobe RGB, NTSC, etc. are used. Naturally, the appearance of the color must be different depending on the model and color gamut, complicating the problem of product color inspection.

  The present inventor can monitor even the same product due to differences in monitor types at multiple points, deterioration of color reproduction function due to the lapse of monitor time, and differences in illumination light depending on time, place, etc. The problem that the displayed color must be different has been shared with the calibration function that corrects the monitor's reproduction function and the illumination light correction function according to the illumination light regardless of the monitor model. It is conceived of a color sharing device of a multi-point monitor that can share an accurate image color at multiple points by providing XYZ values.

  That is, the color sharing device for a multi-point monitor according to the present invention includes a first lens that captures light from a specific area of the display screen of the monitor, and a second lens that captures illumination light. A spectroscope that measures light and outputs a first spectrum, and outputs a second spectrum obtained by measuring illumination light from the second lens, and a measuring unit disposed in the vicinity of the specific region, and the measuring unit And a computer for inputting data from the spectroscope, the computer displaying a color chart in the specific area, thereby referring to the first spectrum, and a chromaticity difference of the monitor A calibration unit that adjusts the illumination spectrum, an illumination light correction unit that performs illumination light correction with different illumination light with reference to the second spectrum, and a color temperature of illumination light that images a target object at a specific point; For the imaging Based on the acquired RGB image or XYZ image, and a sharing calculation unit that calculates the XYZ value to be shared, and based on the temperature of the illumination light acquired at one point and the XYZ value At another point, the illumination light correction unit refers to the color temperature under the illumination light at the other point, converts the XYZ values into RGB values, and displays an image corresponding to the RGB values on the monitor. It is characterized by displaying. It is an invention that unifies the appearance of color under illumination light for observing an object.

  The “specific area” may be a fixed area or a variable area. The computer can form a specific area on the display screen of the monitor. For example, it may be provided in the corner of the display screen or may be a full screen.

  “Monitor” refers to a general display device and follows a general interpretation. For example, it has a color gamut such as sRGB, AdobeRGB (registered trademark), NTSC, BT2020. It doesn't matter whether it is an international standard or not.

  “Spectroscope” may be either singular or plural. A mini-spectrometer or a micro-spectrometer is exemplified.

  “Nearby” means that the first lens and the specific region are brought close to each other to the extent that light from the specific region can be detected.

  “Computer” and “color chart” follow a general interpretation. The computer is exemplified by a personal computer, and the color chart is exemplified by a Macbeth chart.

  “Illumination light correction” is correction for correcting a color difference due to a difference in illumination light between points.

  An "RGB image" is an image based on a type of color expression, expressed as a kind of additive mixture that reproduces a wide range of colors by mixing the three primary colors of Red, Green, and Blue. It is an image. For example, RGB color spaces such as sRGB, AdobeRGB (registered trademark), NTSC, BT2020 are included. It doesn't matter whether it is an international standard or not.

  The “XYZ image” is an image in the XYZ color system, and is an image in the CIE-XYZ color system or an equivalent color system. For example, the color system having the color matching function shown in FIG. 8 may be used.

  “Sharing” is intended to share a specific XYZ value among computers at multiple points.

  “Telecommunication line” means a telecommunication means capable of bidirectional communication by wire or wireless.

  The XYZ values are transmitted to another point via a telecommunication line, and the RGB image adjusted by the calibration unit and the illumination light correction unit is displayed on the monitor at the other point.

  “Calibration” refers to the function of a computer that adjusts the chromaticity difference of a monitor.

  The calibration unit creates an RGB initial color chart by referring to the color temperature of the monitor, displays the RGB initial color chart on the monitor, and the second spectrum based on the display screen and the CIE-XYZ system A color generating unit for creating color charts Xi, Yi, Zi (i is the number of colors of the color chart) with reference to the color matching functions XYZ of the color RGB, and RGB with reference to the color charts Xi, Yi, Zi values An RGB-XYZ matrix that is a conversion formula from XYZ to XYZ, and a matrix creation unit that creates an XYZ-RGB matrix that is a conversion formula from XYZ to RGB.

  The illumination light correction unit converts the shared XYZ values into three-band visual sensitivity images S1i, S2i, S3i, and an object for the three-band visual sensitivity images S1i, S2i, S3i. An image creation unit for correcting illumination light of the illumination light for observing the object with respect to the color temperature of the photographed illumination light and creating three-band visual sensitivity images S1i ′, S2i ′, S3i ′, and the three-band vision A conversion unit that converts the sensitivity images S1i ′, S2i ′, and S3i ′ into X′Y′Z ′ values, and the X′Y′Z ′ values using the XYZ-RGB matrix created by the matrix creation unit. A display unit that converts the image into an RGB image for display.

  The measurement unit may switch the light from the first lens and the illumination light from the second lens with an optical path switch, and input the light to the spectrometer.

  The measurement unit may include a first spectrometer that generates the first spectrum and a second spectrometer that generates the second spectrum.

  When displaying the shared XYZ values on a multi-point monitor, the calibration function and the illumination light correction function are used, as is the case where the object is illuminated under the respective illumination light at each point. Make sure that the object is displayed in the correct color.

  According to the present invention, a simple configuration in which a small, lightweight and inexpensive measuring unit is installed in the vicinity of the monitor, and the illumination light color temperature of the shared measurement place and the measured XYZ value are used. The color of the illumination light on the remote side with the calibration function that corrects the display function of the monitor due to the deterioration of the color difference and the color fidelity illumination light correction function according to the illumination light due to the illumination difference depending on the time and place between the remote places The color difference caused by the temperature difference is corrected, and an image that is not affected by the difference in illumination light can be shared, and the product color can contribute to accurate quality control at multiple points.

1 is a system diagram of a color sharing device of a multipoint monitor according to an embodiment of the present invention. Similarly, it is the arrangement | positioning figure 1 of the internal structure of a measurement part, and its periphery. Similarly, it is the arrangement | positioning figure 2 of the internal structure of a measurement part, and its periphery. Similarly, it is the arrangement | positioning figure 3 of the internal structure of a measurement part, and its periphery. Similarly, it is a flowchart of display calibration processed by a computer. Similarly, it is explanatory drawing which shows the preparation process of an RGB-XYZ matrix. Similarly, it is a flowchart of shared XYZ values. Similarly, it is a graph which shows the relationship between the standard sensitivity of a two-dimensional colorimeter, and a wavelength. Similarly, it is a flowchart of XYZ values for illumination light correction.

  A multipoint monitor color sharing system 1 (hereinafter referred to as a system) according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, the system 1 includes a first lens 3 that captures light from a specific area 22 (see FIG. 2) of the display screen 21 of the monitor 2, and a second lens 4 that captures illumination light. A spectroscope 5 that measures light from the first lens 3 and outputs a first spectrum, and outputs a second spectrum that measures illumination light from the second lens 4, and is near the screen of the monitor 2. And a computer 7 connected to the measurement unit 6 for inputting data from the spectrometer 5 and storing XYZ values. The computer 7 refers to the first spectrum and adjusts the chromaticity difference of the monitor 2, and refers to the second spectrum and the illumination light correction unit 72 that performs illumination light correction with different illumination light. And a sharing calculation unit 73 that calculates each XYZ value based on the color temperature of the image based on the color temperature of the illumination light that images the object and the RGB image or XYZ image.

  The color temperature of the illumination light and the XYZ values obtained by imaging the object on the local side, which is a specific point, are transmitted to other points via the telecommunication line 8, and the calibration unit is located on the remote side, which is another point. 71, the RGB image adjusted by the illumination light correction unit 72 and the sharing calculation unit 73 is displayed on the monitor 202. Here, the environment including the computer 7 is referred to as a local side, and the environment including the computer 207 is referred to as a remote side. Details will be described below.

  As shown in FIGS. 2 and 3, the measurement unit 6 switches the light from the first lens 3 and the illumination light from the second lens 4 with an optical path switch 9 (for example, a mirror), 5 is a structure to be input. As shown in FIG. 4, the measurement unit 6 includes a first spectrometer 5 a that generates the first spectrum and a second spectrometer 5 b that generates the second spectrum without using the optical path switch 9. It is good also as a structure. In this case, the first spectroscope 5a and the second spectroscope 5b have the same spectral sensitivity. The first lens 3 and the second lens 4 are installed in the opening of the opposing wall of the casing 61, and the spectroscopes 5, 5 a and 5 b and the optical path switching switch 9 are accommodated in the casing 61. A dome 62 surrounding the second lens 4 is provided.

  When acquiring the first spectrum of the image of the initial color chart displayed on the monitor 2, the light of the monitor 2 is collected from the first lens 3 on the monitor 2 side by switching the optical path switch 9 as shown in FIG. Light and capture the first spectrum from the micro-spectrometer 5. Further, when acquiring the second spectrum of the illumination light on which the measurement unit 6 is placed, the optical path changeover switch 9 is switched as shown in FIG. The illumination light is taken into the vessel 8.

  As the spectroscopes 5, 5a, 5b, micro-spectrometers are preferable. An example is C12666MA manufactured by Hamamatsu Photonics. This is a fingertip-sized ultra-compact spectroscope head that combines MEMS technology and image measurement technology, with a sensitivity wavelength range of 340 to 780 nm and a wavelength resolution of 15 nm max. The object is imaged with a micro-spectrometer, and spectral sensitivity characteristics, that is, relative sensitivity (%), which is a spectrum output value with respect to a wavelength in the sensitivity wavelength range, is obtained.

  The measurement unit 6 is fixed to the front surface of the monitor 2 with a fixture (not shown) or an adhesive layer (not shown).

  Processing performed in the computer 2 will be described. Since the computer 202 includes the same program, the same processing is performed.

  The calibration unit 71 creates an RGB initial color chart, displays the RGB initial color chart on the monitor 2, the second spectrum based on the specific area 22 of the display screen 21, and the CIE-XYZ color matching function XYZ Referring to the color chart Xi, Yi, Zi values (i is the number of colors of the color chart), and a conversion formula from RGB to XYZ with reference to the color chart Xi, Yi, Zi values And a matrix creation unit for creating an XYZ-RGB matrix that is a conversion formula from XYZ to RGB.

  Processing performed by the calibration unit 71 of the computer 7 will be described in detail with reference to FIG. The color gamut of the monitor 2 is detected (S110), and Macbeth chart data that is the RGB initial color chart Ri, Gi, Bi (i = 1 to 24) is created (S120). The Macbeth chart is an array of tile-shaped color samples divided into 4 × 6, and is used to check the color reproducibility of the image system. The Macbeth chart defines XYZ values for each color in the CIE (International Commission on Illumination). The color chart is displayed on the monitor 2 with reference to the data of the RGB initial color chart, and the color is referred to with reference to the second spectrum based on the light from the specific area 22 of the display screen 21 and the color matching function XYZ of the CIE-XYZ system. Forms Xi, Yi, and Zi values are created (S130). In this case, if the optical path selector switch 9 is switched to the monitor 2 side, the second spectrum indicating the color temperature of the color chart of the monitor 2 can be detected, and this is utilized. With reference to the color charts Xi, Yi, and Zi values, an RGB-XYZ conversion matrix is created in advance as a standard matrix in a table format by the least square method (S140). An XYZ-RGB matrix that is an inverse matrix of RGB-XYZ is created (S150).

  The above S120 will be described in detail. As shown in FIG. 6, the initial color chart RGB is displayed in the specific area 22 of the display screen 21 of the monitor 2, and the Macbeth chart color chart displayed on the monitor 2 while synchronizing with the computer 2 is displayed on the first lens 3 of the measuring unit 6. (FIG. 2), the light is collected into the micro-spectrometer 5, and the multiplication value obtained by multiplying the first spectrum of the color chart detected by the micro-spectrometer 5 with the CIE-XYZ color matching functions X, Y, Z is integrated. The color charts Xi, Yi, Zi are calculated (S130). In this way, the RGB and XYZ table shown in FIG. 6 is created.

  In this way, output values for RGB are obtained by the color charts Xi, Yi, Zi. When the color charts Xi, Yi, and Zi are obtained, an RGB-XYZ conversion matrix for obtaining XYZ from RGB is created. Next, with respect to XYZ, this time it is accurately converted to RGB. For example, since the data taken with an XYZ system camera is an XYZ value, accurate XYZ appears. In order to output it to the monitor 2, an accurate matrix of XYZ is displayed in RGB on the monitor 2 by creating an inverse matrix of the RGB-XYZ conversion matrix and creating an XYZ-RGB conversion matrix which is this inverse matrix. That is, by displaying RGB calculated by the RGB-XYZ conversion matrix on the monitor 2, a mechanism for obtaining an accurate XYZ value can be obtained.

ここで、ＸＹＺは３刺激値、ＲＧＢはＣＩＥ−ＲＧＢの値である。

ここで、ｉは１〜２４の整数である。

ここで、Ｅｘは偏差である。

The above S150 will be described in detail using mathematical expressions. In order that the output value corresponding to the RGB value is obtained as an XYZ value, the coefficients a to i of the matrix are calculated by the least square method for minimizing the difference from the value specified by the initial color chart according to Equations 1 to 4. calculate.

Here, XYZ is a tristimulus value, and RGB is a CIE-RGB value.

Here, i is an integer of 1 to 24.

Here, Ex is a deviation.

  Thereby, a matrix for accurately converting RGB values into XYZ values can be obtained.

In order to display the XYZ values on the monitor 2, Equation 5 which is an inverse matrix of Equation 1 is obtained, and the XYZ values can be converted into RGB values by this matrix.

  The above matrix calculation is automatically calibrated according to the time when the characteristics of the monitor 2 change.

  Such a conversion matrix is prepared in advance according to the type of the color gamut of the monitor. Regarding the color gamut of the monitor 2, for example, there are various color gamuts such as RGB, sRGB, Adobe RGB, NTSC, etc., and the conversion matrix from RGB to XYZ or XYZ to RGB corresponds to each color gamut. It is provided. Since any color gamut can be identified, such as RGB, AdobeRGB, NTSC monitor, etc., RGB values corresponding to the color gamut can be obtained. Since data can be created for 24-color data, the color chart data created by the data is output to the specific area 22 in order. The colors may be displayed in order, or all 24 colors may be displayed. The screen changes in the lower corner of the display screen 21.

  The shared computing unit 73 for computing the illuminating light color temperature and the shared XYZ value at the time of measurement at a shared specific point (here, the local side) is provided because of the model and color gamut of the monitor 2. This is because they are not unified in various ways. The RGB camera model is shared, and the XYZ camera model is also shared. The camera may be an XYZ two-dimensional colorimeter, an RGB two-dimensional colorimeter, or a microscope camera. As an example of the XYZ camera, refer to [0031] to [0039] of International Publication No. WO2015 / 141233A1 published by the same applicant. Here, on the computer 7 side, for example, the color temperature of the monitor 2 is D50 (5000K) and the illumination light is D50 (5000K). On the computer 207 side, the color temperature of the monitor 2 is set to D65 (6500K), the illumination light is set to D65 (6500K), and an example in which it is not shared at multiple points will be described.

  For conversion of data captured by an RGB camera from RGB to XYZ, an RGB-XYZ conversion table is created using an XYZ two-dimensional colorimeter described in JP-A-2015-6416. In the color gamut (sRGB, AdobeRGB, BT2020, etc.) of the monitor 2, conversion from RGB having no linearity to XYZ is performed. For details, refer to [0047] to [052] of JP-A-2006-6416, which is common to the applicants. In the case of imaging with an XYZ two-dimensional colorimeter, the RGB-XYZ conversion table is not necessary, and the XYZ values of the captured image are used.

  As shown in FIG. 7, RGB data captured by the RGB camera is captured (S210). Using the two-dimensional colorimeter, conversion from RGB to XYZ at the color temperature D50 is performed, and an XYZ value is calculated (S220). The color temperature and XYZ values of the illumination light at the time of imaging on the local side are transmitted from the computer 7 to the computer 207 via the electric communication line 8 (S230). When a two-dimensional colorimeter is used, the RGB-XYZ conversion table is not used and transmitted as it is.

  The standard sensitivity of the two-dimensional colorimeter is as shown in FIG. An example of the specifications of a two-dimensional color meter is an effective frequency value of about 5 million pixels, an effective area of 9.93 mm x 8.7 mm, an image size of 3.45 μm x 3.45 μm, a video output of 12 bits, a camera interface gigE, the number of frames (during focus adjustment) 3 ~ 7 frames / Sec, shutter speed 1 / 15,600Sec ~ 1 / 15Sec, integration time up to 3 seconds, S / N ratio 60dB or more, lens mount F mount, operating temperature 0 ℃ -40 ℃, operating humidity 20% -80% An example is PPLB-500 manufactured by Paparabo Co., Ltd. The XYZ-S123 image is converted using Equation 8 described later.

  The computer 207 is connected to a monitor 202 having a different color gamut from the monitor 2, and the monitor 202 includes the same measurement unit 207 as the measurement unit 7. Similar to the computer 7, the computer 207 includes a calibration unit 71 that adjusts the chromaticity difference of the monitor 202, an illumination light correction unit 72 that performs illumination light correction with different illumination light with reference to the second spectrum, And a common computing unit 73 for computing the color temperature and the XYZ values of the remote side with the illumination light on the remote side.

  The remote computer 207 receives the color temperature and XYZ values of the illumination light at the time of photographing calculated by the computer 7 via the electric communication line 8. On the computer 207 side, a monitor 202 having a color gamut different from that of the monitor 2 is used. The illumination light is D65 and the conditions are different from those of the illumination light D50 of the local computer 7. Therefore, the illumination light correction is automatically performed by the computer 207 as follows. Since the calibration of the monitor 202 is performed in accordance with the process as described above, the illustration and description are incorporated.

Prior to the description of the illumination light correction process, conversion between the XYZ values and the three-band visual sensitivity images S1i, S2i, S3i (i is the number of pixels of the camera, hereinafter abbreviated as S123 image) will be described. Equation 6 is a forward matrix from S123 to XYZ, and Equation 7 is an inverse matrix from XYZ to S123. Formula 8 shows an example of Formula 7.

  The illumination light correction unit 72 converts the XYZ value into the S123 image, and the color temperature of the illumination light at the time of photographing on the local side and the color temperature of the remote illumination light that receives this with respect to the S123 image XYZ− created by the matrix creation unit, the image creation unit that corrects the illumination light based on the difference between the two, and the image creation unit that creates S123 ′, the conversion unit that converts S123 ′ to the XYZ ′ value, and the X′Y′Z ′ value. A display unit that converts the image into an RGB image using an RGB matrix and displays the image.

  The process shown in FIG. 9 will be described. The color temperature and XYZ values of the illumination light at the time of photographing are received (S310). This XYZ value is converted into an S123 image by the inverse matrix of Equation 7 (S320). An S123 image is created (S330). The illumination light correction is performed on the S123 image based on the difference in the color temperature of the illumination light from the color temperature of the illumination light at the time of photographing (S340). In this case, if the optical path changeover switch 9 is switched to illumination light, the second spectrum indicating the color temperature of the illumination light at the observation point, here the remote side, can be detected. An S123 ′ image after the illumination light correction is created (S350). The S123 image is converted into XYZ ′ values by the forward matrix of Equation 6 (S360). An XYZ ′ image is created. The XYZ ′ image is converted into the RGB image by the XYZ-RGB matrix (see S160) created by the calibration unit 71 (S380). The RGB image is displayed on the monitor 202 (S390).

  The XYZ color system XYZ camera described above is used for the illumination light correction in S340, and details of the gain adjustment of the XYZ camera are described in [0031] to [0031] of International Publication No. WO2015 / 141233A1 shared by the applicant. 14 to 16, or JP-A-2018-4423 [0068] to [0071] and FIGS. 10 to 12, and the adjustment from D65 to D50 is described. In the embodiment, since the illumination light correction processing is performed based on the difference in the color temperature of the illumination light from the color temperature of the illumination light at the time of photographing, the description is used. Thus, by interposing the S123 image, even if it is an RGB image captured at the color temperature of the illumination light at the time of shooting on the local side, which is different from that under the illumination on the remote side that is the observation point, There is an advantage that the monitor 202 can be seen with a color that feels the same as the color seen under the illumination light to be observed.

  Although the same products are currently produced at various factories around the world, including Japan, the products manufactured at each factory are actually manufactured in different colors due to various circumstances. . For this reason, inconvenience occurs due to the difference in color. Therefore, in this embodiment, even when the color temperature A of the lighting of a certain factory A, the color gamut B of the monitor B, the color temperature C of the lighting of some other factory C, and the color gamut D of the monitor D, Since the monitor B and the monitor D can be displayed so as to feel the same color if the target is the same under the respective lighting, when observing a product (actual product) manufactured in the factory C, Thus, there is an effect that the color difference from the color displayed on the monitor D can be confirmed.

  According to the present embodiment described above, the calibration of the multi-point monitors 2 and 202 is periodically performed, and the illumination light is periodically corrected at the multi-points, and these processes are related. In addition, by sharing the shared XYZ values at multiple points, the monitor 2 can feel the same color even if the type of monitor is different at multiple points or the illumination light changes at multiple points. 202, the color of the product can be seen. In this way, it is possible to share an image with little color error.

  Monitors used by business operators can be used stably for color management of products over time, even if the time and place where the product was imaged is different, the product color is the same lighting It can be managed under light, and a great technical effect can be expected such as smooth quality control of industrial products and parts produced on a global scale. For example, the same product (for example, clothes) produced at various factories around the world is displayed on the monitor with the color of the actual product at each local side and the color of the remote product produced at another factory, It is possible to determine in a unified manner whether the actual color and the color of the monitor feel the same. In the global geographical area or a specific geographical area, the actual color can be corrected in the manufacturing process, and the product color variation can be unified.

DESCRIPTION OF SYMBOLS 1 ... Color sharing apparatus 2,202 ... Monitor 21 ... Display screen 22 ... Specific area 3 ... 1st lens 4 ... 2nd lens 5, 5a, 5b ... Spectroscope 6, 206 ... Measurement part 61 ... Case 62 ... Dome 7,207 ... Computer 71 ... Calibration part 72 ... Illumination light correction part 8 ... Electrical communication line 9 ... Optical path switch

Claims (4)

A first lens that captures light from a specific area of the display screen of the monitor; and a second lens that captures illumination light; measures light from the first lens and outputs a first spectrum; A spectroscope that outputs a second spectrum obtained by measuring the illumination light, and a measurement unit disposed in the vicinity of the specific region,
A computer connected to the measurement unit and inputting data from the spectrometer,
The computer
A calibration unit for adjusting a chromaticity difference of the monitor with reference to the first spectrum by displaying a color chart in the specific region;
An illumination light correction unit that performs illumination light correction with different illumination light with reference to the second spectrum;
A sharing calculation unit that calculates the XYZ values to be shared based on the color temperature of the illumination light that images the object and the RGB image or XYZ image acquired by the imaging;
With
Based on the temperature of the illumination light acquired at one point and the XYZ value, at another point, the illumination light correction unit refers to the color temperature under the illumination light at the other point, and the XYZ A color sharing apparatus for a multi-point monitor, which converts a value into an RGB value and displays an image corresponding to the RGB value on the monitor.   The color temperature and XYZ values of the illumination light obtained by imaging the object at the one point are transmitted to another point via an electric communication line, and at the other point, the calibration unit and the illumination light correction unit 2. The color sharing apparatus for a multipoint monitor according to claim 1, wherein the adjusted RGB image is displayed on the monitor. The calibration unit is
A creation unit for creating an RGB initial color chart;
The RGB initial color chart is displayed on the monitor, and the color chart Xi, Yi, Zi values (i is the color chart color) by referring to the second spectrum based on the display screen and the CIE-XYZ system color matching function XYZ. Number.)
Create a matrix by referring to the color chart Xi, Yi, Zi values to create an RGB-XYZ matrix that is a conversion formula from RGB to XYZ and / or an XYZ-RGB matrix that is a conversion formula from XYZ to RGB And
The color sharing device for a multi-point monitor according to claim 1 or 2. The illumination light correction unit is
A conversion unit for converting the shared XYZ values into three-band visual sensitivity images S1i, S2i, S3i;
An image creation unit that performs illumination light correction of illumination light on the three-band visual sensitivity images S1i, S2i, and S3i, and creates three-band visual sensitivity images S1i ′, S2i ′, and S3i ′;
A conversion unit for converting the three-band visual sensitivity images S1i ′, S2i ′, S3i ′ into X′Y′Z ′ values;
A display unit that converts the X′Y′Z ′ value into an RGB image using the XYZ-RGB matrix created by the matrix creation unit;
Multipoint monitor color sharing device with

Images