JP2001174334A - Colorimetric device, colorimetric method, coefficient calculating method, coefficient calculating device, and coefficient calculating program memory medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accurate colorimetric value with a simple device. SOLUTION: This colorimetric device is provided with a spectral reflectance measurement section 20 for radiating the measurement light to a sample to measure the spectral reflectance and a three-stimulus value calculation section 30 calculating W to satisfy the relation W=W0+(Eil-Ecp)×(Wu-Wuv)/Eu, where W is a three-stimulus value obtained when the first and second measurement light are radiated to a fluorescent sample 40 including a fluorescent material, the measured first and second spectral reflectance are inputted, and the observation light is radiated to the fluorescent sample 40, Eil is the observation light excited energy obtained when the fluorescent material is excited by the observation light, Ecp is a prescribed correction coefficient, Eu is the measurement light excited energy obtained when the fluorescent material is excited by the first measurement light, Wu and Wuv are the three-stimulus values obtained when the first measurement light is radiated to the virtual first and second materials, and W0 is the three-stimulus value obtained when the observation light is radiated to the second material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colorimetric apparatus and a colorimetric method for determining a colorimetric value of a color of a sample under predetermined observation light.
The present invention relates to such a colorimetric device, a coefficient calculating method for calculating a correction coefficient used in a colorimetric method, a coefficient calculating device, and a coefficient calculating program storage medium.

[0002]

2. Description of the Related Art For example, a color of a print image created by a printing machine is matched with a color of a hard copy image created by a color printer, or a color of a soft copy image displayed on a monitor is compared with a print image or the like. In order to match the color of the hard copy image, output control values such as a dot area ratio, an exposure intensity, a CRT control signal, and the like in each output device such as a printing machine, a color printer, and a monitor, and the like, are generated by each output device. The correspondence between the color of the image and the colorimetric value is determined in advance, and the output control value of each output device is adjusted using this correspondence so that the colors of the images created by the different output devices match. That is being done. Here, as the colorimetric value of the color of the image, for example, XY
A tristimulus value of the Z system, a tristimulus value of the RGB system, a CIELAB value, and the like can be considered.

In order to perform such adjustments accurately and to realize accurate color matching, it is necessary to accurately obtain the above-mentioned correspondence, and accurate colorimetric values of image colors are required.

In a general colorimetric method, a sample is irradiated with a predetermined measuring light, and the spectral reflectance is measured by spectrophotometrically measuring the reflected light reflected by the sample. Using the light spectrum and the color matching function, the tristimulus value of the color of the sample when the observation light is irradiated is obtained as a colorimetric value. When a CIELAB value is required, a CIELAB value is calculated from the tristimulus values.

However, many printing papers, printing papers, photographic papers and the like contain a fluorescent whitening agent for the purpose of increasing whiteness. This fluorescent whitening agent is a kind of fluorescent substance, and emits visible light fluorescence by absorbing ultraviolet light. For this reason, the apparent spectral reflectance increases by the amount of the fluorescence, and the colorimetric value becomes inaccurate.

[0006]

On the other hand, a colorimetric method for obtaining an accurate colorimetric value in consideration of the amount of fluorescence has been proposed in JP-A-10-176953. In the colorimetry method proposed in this publicity, an ultraviolet cut filter that almost completely cuts off the light component in the ultraviolet region included in the light is used, and the first measurement using the light emitted from a predetermined measurement light source as it is is performed. The light and the second measurement light from which the light component in the ultraviolet region is cut by the ultraviolet cut filter out of the light emitted from the measurement light source are prepared. Then, the first measurement light and the second measurement light are applied to a fluorescent sample containing a fluorescent substance, and an apparent first spectral reflectance and a second spectral reflectance are measured, respectively. Based on the first and second spectral reflectances, the spectra of the first and second measurement lights, and the color matching function, a virtual first substance having the first spectral reflectance as a true reflectance Tristimulus values Xu, Yu, and Zu representing the color of the first substance when the first measurement light is irradiated are calculated, and the virtual second having the second spectral reflectance as a true reflectance. Tristimulus values Xuv, Yuv, Zuv representing the color of the second substance when the first substance is irradiated with the first measurement light
Is also calculated. Also, based on the second spectral reflectance and the spectrum of the predetermined observation light, a tristimulus value X representing the color of the second substance when the second substance is irradiated with the observation light.
0, Y0, and Z0 are also calculated. Further, based on the ultraviolet absorption spectrum of the fluorescent substance contained in the sample and the spectrum of the first measurement light, the measurement light excitation energy Eu at which the fluorescent substance is excited by the first measurement light is calculated, and the ultraviolet absorption energy Eu is calculated. The observation light excitation energy Eil at which the fluorescent substance is excited by the observation light is calculated based on the spectrum and the spectrum of the observation light. Then, for these calculated values, tristimulus values X, Y, and Z representing the color of the fluorescent sample when the observation light is applied to the fluorescent sample are expressed as follows: X = X0 + Eil × (Xu−Xuv) / Eu Y = Y0 + Eil × (Yu−Yuv) / Eu Z = Z0 + Eil × (Zu−Zuv) / Eu The tristimulus values X, Y and Z are calculated so as to satisfy the following relationship.

[0007] According to such a colorimetric method, an accurate colorimetric value can be obtained. However, a colorimetric device for realizing this colorimetric method can be used up to a site where an output device for performing color matching is installed. It is difficult to realize a simple device that can be carried around.

On the other hand, a simple spectral reflectance measuring device provided with an ultraviolet cut filter is commercially available. The ultraviolet cut filter of such a simple spectral reflectance measuring device sufficiently cuts light components in the ultraviolet region. Often cannot. For this reason, if the spectral reflectance measured by this simple spectral reflectance measuring device is used, there is a problem that an accurate colorimetric value cannot be calculated by the above-mentioned relational expression.

In view of the above circumstances, the present invention provides a simple colorimetric device capable of obtaining accurate colorimetric values, a colorimetric method which can be implemented by such a simple colorimetric device, and such a colorimetric device. ,
An object of the present invention is to provide a coefficient calculation method, a coefficient calculation device, and a coefficient calculation program storage medium for calculating a correction coefficient used in a colorimetric method.

[0010]

According to the present invention, there is provided a colorimeter for irradiating a sample with measurement light, and spectrally measuring light reflected by the sample to obtain a spectral reflectance of the sample. The measurement is performed by irradiating the first measurement light having a relatively high light intensity in the ultraviolet region, and the measurement is performed by irradiating the second measurement light having a relatively low light intensity in the ultraviolet region. And a first reflectance measuring unit that irradiates a fluorescent sample containing a fluorescent substance with the first measurement light, and spectrally measures light obtained by mixing reflected light and fluorescence. The first spectral reflectance measured as described above and the second spectral reflectance measuring unit
Is irradiated, and the apparent second spectral reflectance measured by spectrophotometrically measuring the mixed light of the reflected light and the fluorescent light is input, and the predetermined observation light is applied to the fluorescent sample. The tristimulus value X, which represents the color of the fluorescent sample when irradiated,
The tristimulus value W of at least one of Y and Z is
The one tristimulus value W, the observation light excitation energy Eil at which the fluorescent substance contained in the fluorescent sample is excited by the observation light, a predetermined correction coefficient Ecp, and the fluorescent substance contained in the fluorescent sample The virtual first light having the measurement light excitation energy Eu excited by the first measurement light and the same spectral reflectance as the first spectral reflectance as the true spectral reflectance.
Among the tristimulus values Xu, Yu, and Zu representing the color of the first substance when the substance is irradiated with the first measurement light, a tristimulus value Wu corresponding to the one tristimulus value W; The tristimulus value Xuv representing the color of the second measurement light when the second measurement light is irradiated on the virtual second material having the same spectral reflectance as the true spectral reflectance as the second spectral reflectance. , Yuv, Zu
v, the tristimulus value Wu corresponding to the one tristimulus value W
v and the second substance when the second substance is irradiated with the observation light.
The tristimulus value W0 corresponding to the one tristimulus value W among the tristimulus values X0, Y0, Z0 representing the color of the substance is represented by: W = W0 + (Eil−Ecp) × (Wu−Wuv) / Eu (1) A tristimulus value calculation unit that calculates so as to satisfy the following relationship is provided.

According to the colorimeter of the present invention, the correction coefficient Ec
The tristimulus value W is calculated so as to satisfy the above relational expression (1) including p. Since the correction coefficient Ecp is included in the above position in the relational expression (1), the appropriate value of the correction coefficient Ecp is prepared in advance, so that the second
The influence of the light component in the ultraviolet region included in the measurement light can be canceled. That is, an accurate colorimetric value can be obtained even when the spectral reflectance is measured using an ultraviolet cut filter having an insufficient ability to remove light components in the ultraviolet region. However, in the tristimulus value calculating section according to the present invention, the value of the correction coefficient Ecp does not always need to be prepared, and for example, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, or the value of the correction coefficient Ecp is measured. A value such as a value of the ratio to the photoexcitation energy Eu is prepared, and the colorimetric value may be obtained using the value. Hereinafter, the value of the correction coefficient Ecp and the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, which are used for obtaining an accurate colorimetric value, may be referred to as “correction coefficient or the like”.

In the colorimetric method of the present invention for achieving the above object, the light intensity in the ultraviolet region of the two measurement lights having mutually different light intensities in the ultraviolet region is relatively high with respect to the fluorescent sample containing the fluorescent substance. A first measurement step of irradiating a high first measurement light to the first sample, and measuring an apparent first spectral reflectance by spectrophotometrically measuring light mixed with light reflected by the fluorescent sample and fluorescence; The fluorescence sample is irradiated with a second measurement light having a relatively low light intensity in an ultraviolet region among the plurality of measurement lights, and light obtained by mixing light reflected by the fluorescence sample and fluorescence is spectrally measured. A second measuring step of measuring an apparent second spectral reflectance, and a tristimulus value X, Y, Z representing a color of the fluorescent sample when a predetermined observation light is applied to the fluorescent sample. At least one of the tristimulus values W And one tristimulus value W, the observed excitation energy Eil a fluorescent substance contained in the fluorescent sample is excited by the observation light, a predetermined correction coefficient Ecp
And the measurement light excitation energy Eu in which the fluorescent substance contained in the fluorescent sample is excited by the first measurement light, and the same spectral reflectance as the first spectral reflectance measured in the first measurement step. Virtual first having as a spectral reflectance of
Among the tristimulus values Xu, Yu, and Zu representing the color of the first substance when the substance is irradiated with the first measurement light, a tristimulus value Wu corresponding to the one tristimulus value W; When the first measurement light is applied to the virtual second substance having the same spectral reflectance as the true spectral reflectance as the second spectral reflectance measured in the second measuring step, the second spectral reflectance is obtained. The tristimulus value Wuv corresponding to the one tristimulus value W among the tristimulus values Xuv, Yuv, Zuv representing the color of the substance, and the tristimulus value Wuv of the second substance when the observation light is irradiated on the second substance The tristimulus value W0 corresponding to the one tristimulus value W among the tristimulus values X0, Y0, and Z0 representing colors is expressed as: W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
and a tristimulus value calculating step of calculating so as to satisfy u.

On the other hand, the coefficient calculating method according to the present invention for achieving the above object provides the first measuring light having a relatively high light intensity in the ultraviolet region among two predetermined measurement lights having different light intensities in the ultraviolet region.
Irradiates the fluorescent sample containing the fluorescent substance with the measuring light of, and obtains an apparent first spectral reflectance measured by spectrophotometrically measuring light obtained by mixing the reflected light and the fluorescent light of the fluorescent sample. A first spectral reflectance acquisition step to perform
Of the two measurement lights, the light intensity of which is relatively low in the ultraviolet region.
The second spectroscopy obtains the apparent second spectral reflectance measured by irradiating the fluorescent sample with the measurement light of the above and spectrophotometrically measuring the light obtained by mixing the light reflected by the fluorescent sample and the fluorescent light. Reflectance acquisition step, at least one of tristimulus values W among tristimulus values X, Y, and Z representing a color of the fluorescent sample when the fluorescent sample is irradiated with predetermined observation light.
And the tristimulus value W acquired in the tristimulus value acquiring step, the observation light excitation energy Eil in which the fluorescent substance contained in the fluorescent sample is excited by the observation light, The measurement light excitation energy Eu in which the contained fluorescent substance is excited by the first measurement light and the same spectral reflectance as the first spectral reflectance obtained in the first spectral reflectance obtaining step are used as true spectral reflection. Tristimulus values Xu, Y representing the color of a virtual first substance having a ratio when the first measurement light is applied to the virtual first substance
u and Zu, a tristimulus value Wu corresponding to the one tristimulus value W, and the same spectral reflectance as the second spectral reflectance acquired in the second spectral reflectance acquiring step, the true spectral reflectance. The tristimulus value Xuv, which represents the color of the virtual second substance when the first measurement light is applied to the second substance,
A tristimulus value Wuv corresponding to the one tristimulus value W of Yuv and Zuv, and tristimulus values X0, Y0, and Y3 representing colors of the second substance when the second substance is irradiated with observation light. Z
0, a tristimulus value W0 corresponding to the one tristimulus value W
And the correction coefficient Ecp is: W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
u, the value of the correction coefficient Ecp, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu,
At least one of a value of a ratio of a difference between the observation light excitation energy Eil and the correction coefficient Ecp to the measurement light excitation energy Eu, and a coefficient value obtained by combining the correction coefficient Ecp, the observation light excitation energy Eil, and the measurement light excitation energy Eu by four arithmetic operations. A calculating step of calculating the one value.

According to the coefficient calculation method of the present invention, it is possible to calculate the value of the correction coefficient Ecp and the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp using the accurate tristimulus value W. By using the calculated value at the time of colorimetry, an accurate colorimetric value can be obtained.

In the coefficient calculating method according to the present invention, when a plurality of types of fluorescent samples containing different fluorescent substances are present as the fluorescent samples, the first spectral reflectance obtaining step may include the steps of: Acquiring the spectral reflectance measured for each of them; the second spectral reflectance acquiring step also acquires the spectral reflectance measured for each of the plurality of types of fluorescent samples; Is the value of the correction coefficient Ecp, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu,
A value of a ratio of a difference between the observation light excitation energy Eil and the correction coefficient Ecp to the measurement light excitation energy Eu and at least one of mathematically equivalent values are calculated for each of the plurality of types of fluorescent samples. It is desirable that

When the fluorescent substance is different, the absorption spectrum and the fluorescence spectrum are different. For this reason, if the correction coefficient Ecp or the like according to the fluorescent substance contained in the fluorescent data is calculated, the correction according to the fluorescent substance contained in the fluorescent data is required in measuring the color of the fluorescent sample. By using the coefficient Ecp or the like, a colorimetric value representing the color of the fluorescent sample can be accurately obtained. When the types of the fluorescent substances are the same and only the contents are different, an accurate colorimetric value is obtained by the same correction coefficient Ecp or the like.

Further, the coefficient calculation method of the present invention is characterized in that the first
When there are a plurality of combinations having different spectra of the measurement light as combinations of the measurement light and the second measurement light, the first spectral reflectance obtaining step includes the first spectral reflectance acquisition step. The spectral reflectance is measured by irradiating the measurement light, and the second
Is also a step of acquiring the spectral reflectance measured by irradiating the second measurement light of each of the plurality of combinations, and the calculating step includes the value of the correction coefficient Ecp, the observation light excitation energy The value of the difference between Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu, the value of the ratio between the difference between the observation light excitation energy Eil and the correction coefficient Ecp and the measurement light excitation energy Eu, and It is preferable that at least one of mathematically equivalent values is calculated for each of the plurality of combinations.

When the spectrum of the measuring light is different, the amount of light emitted from the fluorescent substance is different. Therefore, if the correction coefficient Ecp or the like according to the combination of the first measurement light and the second measurement light is calculated, the correction coefficient according to the combination of the measurement light is used in measuring the color of the fluorescent sample. An accurate colorimetric value is obtained by using Ecp or the like.

In order to achieve the above object, the coefficient calculating apparatus according to the present invention is characterized in that, out of two predetermined measurement lights having different light intensities in the ultraviolet region, the first measurement light having a relatively high light intensity in the ultraviolet region is: First spectroscopy that irradiates a fluorescent sample containing a fluorescent substance and obtains an apparent first spectral reflectance measured by spectrophotometry of light obtained by mixing light reflected by the fluorescent sample and fluorescence. A reflectance obtaining means for irradiating the fluorescent sample with a second measurement light having a relatively low light intensity in an ultraviolet region of the two measurement lights, and mixing the reflected light and the fluorescence of the fluorescent sample; Obtains an apparent second spectral reflectance measured by spectrophotometry of the second.
Means for acquiring spectral reflectance, tristimulus values X, representing the color of the fluorescent sample when the fluorescent sample is irradiated with predetermined observation light,
A tristimulus value acquiring unit for acquiring at least one of the tristimulus values W of Y and Z; a tristimulus value W acquired by the tristimulus value acquiring unit; and a fluorescent substance contained in the fluorescent sample. Observation light excitation energy Eil excited by the observation light, measurement light excitation energy Eu by which the fluorescent substance contained in the fluorescent sample is excited by the first measurement light, and the first spectral reflectance acquisition means. Tristimulus value representing the color of the first substance when the first measurement light is applied to the virtual first substance having the same spectral reflectance as the first spectral reflectance as the true spectral reflectance X
A true spectral value is obtained by selecting a tristimulus value Wu corresponding to the one tristimulus value W among u, Yu, and Zu and the same spectral reflectance as the second spectral reflectance acquired by the second spectral reflectance acquiring unit. When one of the tristimulus values Xuv, Yuv, Zuv representing the color of the virtual second substance having the reflectivity is irradiated with the first measurement light, the tristimulus value W is one of the tristimulus values Xuv, Yuv, Zuv. A corresponding tristimulus value Wuv and a tristimulus value X0, which represents the color of the second substance when the observation light is irradiated on the second substance,
The correction coefficient Ecp for the tristimulus value W0 corresponding to the one tristimulus value W among Y0 and Z0 is: W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
u, the value of the correction coefficient Ecp, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu,
At least one of a value of a ratio of a difference between the observation light excitation energy Eil and the correction coefficient Ecp to the measurement light excitation energy Eu, and a coefficient value obtained by combining the correction coefficient Ecp, the observation light excitation energy Eil, and the measurement light excitation energy Eu by four arithmetic operations. And a calculating means for calculating the one value.

Further, the coefficient calculation program storage medium of the present invention that achieves the above object provides the first measurement light having a relatively high light intensity in the ultraviolet region among two predetermined measurement lights having different light intensities in the ultraviolet region. The measurement light is applied to the fluorescent sample containing the fluorescent substance, and the apparent first spectral reflectance measured by measuring the light obtained by mixing the light reflected by the fluorescent sample and the fluorescence is measured. A first spectral reflectance obtaining means for irradiating a fluorescent sample with a second measuring light having a relatively low light intensity in an ultraviolet region of the two measuring lights, and mixing the reflected light from the fluorescent sample with the fluorescent light; Second spectral reflectance acquiring means for acquiring an apparent second spectral reflectance measured by spectrophotometrically measuring the color of the fluorescent sample, the color of the fluorescent sample when the fluorescent sample is irradiated with predetermined observation light Of the tristimulus values X, Y, and Z Either even without one of the three stimulus value W
And the tristimulus value W obtained by the tristimulus value obtaining means, the observation light excitation energy Eil at which the fluorescent substance contained in the fluorescent sample is excited by the observation light, The measurement light excitation energy Eu, in which the contained fluorescent substance is excited by the first measurement light, and the same spectral reflectance as the first spectral reflectance acquired by the first spectral reflectance acquiring means are used as true spectral reflection. Tristimulus values Xu, Y representing the color of a virtual first substance having a ratio when the first measurement light is applied to the virtual first substance
u and Zu, the tristimulus value Wu corresponding to the one tristimulus value W, and the same spectral reflectance as the second spectral reflectance acquired by the second spectral reflectance acquiring means, and the true spectral reflectance. The tristimulus value Xu representing the color of the virtual second substance when the first measurement light is applied to the second substance
v, Yuv, Zuv, a tristimulus value Wuv corresponding to the one tristimulus value W, and a tristimulus value X0, which represents the color of the second substance when the second substance is irradiated with observation light. Y
The correction coefficient Ecp for the tristimulus value W0 corresponding to the one tristimulus value W among 0 and Z0 is: W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
u, the value of the correction coefficient Ecp, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu,
At least one of a value of a ratio of a difference between the observation light excitation energy Eil and the correction coefficient Ecp to the measurement light excitation energy Eu, and a coefficient value obtained by combining the correction coefficient Ecp, the observation light excitation energy Eil, and the measurement light excitation energy Eu by four arithmetic operations. A coefficient calculation program including calculation means for calculating one value is stored.

The coefficient calculating device of the present invention and the coefficient calculating program referred to in the present invention are only described here in their basic form, but this is merely to avoid duplication, The devices and the like include not only the above-described coefficient calculation device and coefficient calculation program in the basic mode, but also various types of coefficient calculation devices and coefficient calculation programs corresponding to the respective modes of the coefficient calculation method described above.

Further, in the coefficient calculating apparatus of the present invention and the coefficient calculating program, the same names as those of the tristimulus value obtaining means and the calculating means are given as names of the constituent elements. In the case of a coefficient calculation device, it refers to the combination of software and hardware that perform such an operation, and in the case of a coefficient calculation program, it refers only to the software portion that performs such an operation.

[0023]

Embodiments of the present invention will be described below.

FIG. 1 is a diagram showing an embodiment of the colorimetric apparatus of the present invention.

The colorimetric device 10 is configured by connecting the above-described simple spectral reflectance measuring device 20 and a notebook personal computer 30.

The spectral reflectance measuring device 20 is an example of the spectral reflectance measuring unit according to the present invention. The spectral reflectance measuring device 20 has a predetermined measuring light source in a spectral photometric unit 21 and the measuring light source. Color light 40 on the table 22
And irradiates the patch 41 with the light, and spectrally measures the light reflected by the patch 41 to measure the spectral reflectance of the patch 41. Also, the spectral reflectance measuring device 2
0 is provided with an ultraviolet cut filter for attenuating the intensity of the ultraviolet light, the measurement state in which the light of the measurement light source is directly applied to the patch 41, and the light after the ultraviolet cut filter acts on the light of the measurement light source. The measurement can be performed both in the measurement state in which the patch 41 is irradiated. However, the attenuation of the ultraviolet light by the ultraviolet cut filter is incomplete, and the light after the ultraviolet cut filter acts on the light of the measurement light source contains a considerable amount of ultraviolet light.

The personal computer 30 is an example of the tristimulus value calculating section according to the present invention, and FIG. 2 is a hardware configuration diagram of the personal computer 30. Hereinafter, description will be made with reference to FIGS. 1 and 2.

The personal computer 30 has a main body 31 and a liquid crystal display 3 for displaying an image on a liquid crystal screen 32a in response to an instruction from the main body 31 due to its external configuration.
2. A keyboard 33 for inputting various types of information corresponding to key operations to the main body 31 and an arbitrary position on the liquid crystal screen 32a are designated to input an instruction corresponding to, for example, an icon or the like displayed at that position. Pointing device 34 and a floppy disk 50 loaded with a floppy disk 50 and accessing the loaded floppy disk 50
A drive 35 is provided. The main body 31 has a CD-ROM loading port 31a for loading the CD-ROM 60 in appearance.

As shown in FIG. 2, inside the main body 31,
The CPU 311, which executes various programs, and the programs stored in the hard disk device 313 are read out and read from the CP.
Main memory 312 expanded for execution in U311;
A hard disk drive 313 in which various programs and data are stored, a CD-ROM 60 is loaded, and a CD-ROM drive 315 for accessing the loaded CD-ROM 60 is connected to the spectral reflectance measuring device 20 to measure the spectral reflectance. An I / O interface 316 for receiving measurement data from the device 20 is built in, and these various elements, the liquid crystal display 32, the keyboard 33,
The pointing device 34 and the FD drive 35
They are interconnected via a bus 317.

Here, a program for operating the personal computer 30 as the tristimulus value calculating section according to the present invention is stored in the CD-ROM 60,
The CD-ROM 60 is loaded into a CD-ROM drive 315, and the program stored in the CD-ROM 60 is uploaded to the personal computer 30 and stored in the hard disk device 313. Further, here, the color matching function, the measurement light excitation energy Eu according to the present invention, the correction coefficient Ecp according to the present invention, and the book corresponding to each of a plurality of predetermined types of observation light are transmitted from the floppy disk 50 to the personal computer 30. The observation light excitation energy Eil and the spectrum of each of the plurality of types of observation light according to the present invention are uploaded and stored in the hard disk device 313, and are read into the main memory 312 as needed and used for calculation.

FIG. 3 is a flowchart of color measurement by the color measurement device 10 shown in FIG.

First, the spectral reflectance measuring device 20 shown in FIG.
Thereby, the light of the measurement light source is directly applied to the patch, and the spectral reflectance of the patch 41 is measured (Step S10).
1). Further, the light after the ultraviolet cut filter is applied to the light of the measurement light source is irradiated on the patch 41 by the spectral reflectance measuring device 20, and the spectral reflectance is measured (step S102). The spectral reflectance measured in this manner is an apparent spectral reflectance based on a mixture of the fluorescent light and the reflected light of the fluorescent whitening agent contained in the paper of the chart 40, and is obtained in step S101. The first spectral reflectance is different from the second spectral reflectance obtained in step S102.

These first and second spectral reflectances are input to the personal computer 30 shown in FIG. 1, and based on these spectral reflectances, color matching functions, etc., the same spectral reflectances as the second spectral reflectances. Of the tristimulus values X0, Y0, and Z0 representing the color of a virtual substance having a ratio as a true spectral reflectance when the observation light is irradiated with the observation light, and the tristimulus values generated by the fluorescence of the fluorescent whitening agent The deviations ΔX, ΔY, ΔZ are calculated (step S103). ΔX,
ΔY and ΔZ are tristimulus representing the color of the first substance when the light of the measurement light source is directly irradiated on the virtual first substance having the first spectral reflectance as the true spectral reflectance. The values Xu, Yu, Zu and the color of the second substance when the light of the measurement light source is directly irradiated on the virtual second substance having the second spectral reflectance as the true spectral reflectance. The tristimulus values Xuv, Yuv, Zuv, and the measurement light excitation energy E at which the optical brightener is excited by the light from the measurement light source.
Based on u, it is calculated according to a relational expression of ΔX = (Xu−Xuv) / Eu ΔY = (Yu−Yuv) / Eu ΔZ = (Zu−Zuv) / Eu In the flowchart shown in FIG. 3, the tristimulus values X0, Y0, Z0 and the deviations ΔX, ΔY, ΔZ of the tristimulus values are represented by the tristimulus value X0 and the deviation ΔX of the tristimulus values. Similarly, in the following description, the tristimulus values X, Y, Z, and the like may be represented by the tristimulus values X and the like.

In step S103, the tristimulus values X0, Y0,
After calculating Z0 and the deviation ΔX, ΔY, ΔZ between the tristimulus values, the calculated values and the observation light excitation energy Eil stored in the hard disk device 313 shown in FIG.
And the correction coefficient Ecp, the tristimulus values X, Y, and Z of the color of the patch are calculated as follows: X = X0 + (Eil−Ecp) × ΔX Y = Y0 + (Eil−Ecp) × ΔYZ = Z0 + (Eil−Ecp) ) × ΔZ (Step S104).
As will be described later, an appropriate value is obtained in advance as the correction coefficient Ecp, and by using an equation in which the correction coefficient Ecp exists, the incomplete removal of ultraviolet rays by the ultraviolet cut filter of the spectral reflectance measuring device can be reduced. Correct corrected tristimulus values X, Y, and Z are obtained. FIG.
It is not always necessary to store the value of the correction coefficient Ecp in the personal computer 30 shown in FIG. 2, but the correction coefficient such as the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp is stored. May be used to calculate tristimulus values X, Y, and Z.

The tristimulus values X, Y, and Z calculated by this relational expression are displayed on the liquid crystal screen 32a in association with each patch 41 shown in FIG.

Next, an embodiment of the coefficient calculating apparatus of the present invention for calculating the above-described correction coefficient and the like will be described.

FIG. 4 is a configuration diagram of a coefficient calculation system including an embodiment of the coefficient calculation device of the present invention.

The coefficient calculating system 70 includes a reference colorimetric device 80, a spectral reflectance measuring device 20, and a computer 9
0, and this computer 90 operates as one embodiment of the coefficient calculation device of the present invention.

The reference colorimeter 80 is provided with an ultraviolet cut filter capable of completely cutting off light in the ultraviolet region, and can be accurately determined by the colorimetry method proposed in the above-mentioned Japanese Patent Application Laid-Open No. 10-176953. This is a colorimetric device that can obtain a colorimetric value.

The spectral reflectance measuring device 20 is the same device as the spectral reflectance measuring device 20 shown in FIG.

The computer 90 stores in advance the spectra of each of a plurality of types of observation light, color matching functions, and the like, and stores correction coefficients and the like for the spectral reflectance measuring device 20 in the spectral reflectance measurement. It is calculated based on the spectral reflectance measured by the device 20, the colorimetric value measured by the reference colorimetric device 80, the stored color matching function, and the like. Then, the calculated correction coefficient and the like are stored in the personal computer 30 shown in FIG.

FIG. 5 is an external perspective view of a computer 90 shown by one block in FIG. 4, and FIG. 6 is a hardware configuration diagram of the computer.

Like the personal computer 30 shown in FIG. 1, the computer 90 includes a main body 91, a display 92, a keyboard 93, and a mouse 94 having the same functions as the pointing device 34 shown in FIG. I have. The main body 91 has a floppy disk loading port 91a and a CD-ROM loading port 91b in appearance.

As in the case of the main body 31 shown in FIG. 1, inside the main body 91 shown in FIG.
1, main memory 912, hard disk device 100, CD
-ROM drive 915 is built-in. Also, FD
A drive 914 is also built in, and is connected to the reference colorimeter 80 and the spectral reflectometer 20 (see FIG. 4).
An I / O interface 916 for receiving measurement data from the reference colorimeter 80 and the spectral reflectance measuring device 20 is also provided.

These various elements and the display 92, the keyboard 93 and the mouse 94 are mutually connected via a bus 95.

Here, the CD-ROM 61 stores a coefficient calculation program for operating the computer 90 as a coefficient calculation device.
61 is loaded into the CD-ROM drive 915 and its C
The coefficient calculation program stored in the D-ROM 61 is uploaded to the personal computer 90 and stored in the hard disk device 100.

Here, when one embodiment of the coefficient calculation program according to the present invention is stored in the CD-ROM 61, the CD-ROM 61 corresponds to one embodiment of the coefficient calculation program storage medium of the present invention. When the coefficient calculation program is uploaded and stored in the hard disk device 100, the hard disk device 100 in which the coefficient calculation program is stored also corresponds to an embodiment of the coefficient calculation program storage medium of the present invention. Further, when the coefficient calculation program is downloaded to the floppy disk 51, the floppy disk 51 in which the coefficient calculation program is stored also corresponds to an embodiment of the coefficient calculation program storage medium of the present invention.

FIG. 7 shows a coefficient calculation system 70 shown in FIG.
6 is a flowchart showing a calculation procedure of a correction coefficient and the like according to FIG.

First, the spectral reflectance measuring device 20
The white paper containing the fluorescent whitening agent is irradiated with the light of the measurement light source as it is, and the apparent spectral reflectance of the white paper is measured and acquired by the computer 90 (step S201). Further, the light after the ultraviolet cut filter is applied to the light of the measurement light source is irradiated on the white paper by the spectral reflectance measuring device 20, and the apparent spectral reflectance of the white paper is measured and acquired by the computer 90 ( Step S202). Furthermore, accurate colorimetric values X, Y,
Z is measured by the reference colorimeter 80 and acquired by the computer 90 (step S203).

Then, based on the spectral reflectance measured by the spectral reflectance measuring device 20 and the color matching function prepared in advance, the apparent first spectral reflectance measured in step S201 is calculated. A tristimulus value X representing a color of a virtual first substance having a true spectral reflectance when the light of the measurement light source is directly irradiated on the virtual first substance.
u, Yu, and Zu, and the virtual second substance having the apparent second spectral reflectance measured in step S202 as the true spectral reflectance when the light of the measurement light source is irradiated as it is. Tristimulus value Xu representing the color of the second substance
v, Yuv, Zuv and tristimulus values X0, Y0, Z0 representing the color of the second substance when the second substance is irradiated with predetermined observation light are calculated (step S204).
However, when the tristimulus values X0, Y0, and Z0 representing the color of the second substance when the observation light is irradiated are calculated, the reference colorimetric device 80 and the spectral reflectance measuring device 20 shown in FIG. And a correction coefficient for canceling the difference in the measured values between the measuring instruments due to various factors except the ultraviolet cut filter between the three stimulus values X0, Y0 and Z0 are calculated. A method of obtaining a correction coefficient for canceling a difference between measuring devices will be described later.

Next, the measurement light excitation energy Eu is calculated (step S205). The measurement light excitation energy Eu is a value stored in the personal computer 30 shown in FIG. 1 and used for calculating a colorimetric value, and is obtained in advance here.

By the way, the measurement light excitation energy Eu is
If the spectrum of the light emitted from the measurement light source is known, it can be easily calculated using the absorption spectrum of the optical brightener. However, when a commercially available spectral reflectance measuring device is used as the spectral reflectance measuring device 20 shown in FIG. 1, the spectrum of the light emitted from the measurement light source is often unknown. Therefore, here, the measurement light excitation energy Eu is calculated by the procedure described below.

First, the spectral reflectance of a blank sheet measured when the colorimetric value is obtained by the reference colorimeter 80 is obtained, and the spectral reflectance and the spectrum of the measurement light source of the reference colorimeter 80 are used. Then, the shift ΔX (or ΔY or ΔZ) of the tristimulus value caused by the fluorescence of the fluorescent whitening agent is calculated.

Next, the spectral reflectance of the white paper measured by the spectral reflectance measuring device 20 and the spectrum of a predetermined light source estimated to be the same type of light source as the measuring light source of the spectral reflectance measuring device 20 are calculated. The tristimulus value Xu representing the color of the first substance and the tristimulus value Xuv representing the color of the second substance are calculated using the relational expression of ΔX = (Xu−Xuv) / Eu. The measurement light excitation energy Eu is calculated.

After the measurement light excitation energy Eu is calculated in step S205, the measured light excitation energy Eu, the colorimetric values X, Y, and Z obtained in step S203, and the tristimulus calculated in step S204. Values Xu, Yu, Zu; Xuv, Yuv, Zuv; X0,
A correction coefficient Ecp is given by X = X0 + (Eil−Ecp) × (Xu−Xuv) / E for Y0, Z0 and the observation light excitation energy Eil calculated in advance.
u Y = Y0 + (Eil−Ecp) × (Yu−Yuv) / E
u Z = Z0 + (Eil−Ecp) × (Zu−Zuv) / E
A correction coefficient such as a value of the correction coefficient Ecp or a value of a difference between the observation light excitation energy Eil and the correction coefficient Ecp is calculated so as to satisfy the relationship u (step S20).
6). The correction coefficients and the like calculated in this way are stored in a floppy disk 51 shown in FIG. 6, and the floppy disk 51 is loaded into the personal computer 30 as the floppy disk 50 shown in FIG. Is uploaded.
Then, an accurate colorimetric value is measured by using the correction coefficient and the like.

In the following, a method of obtaining a correction coefficient for canceling the above-described difference between measuring instruments will be described. As such correction coefficients, for example, three types of correction coefficients described below can be considered.

Regardless of which of the three types of correction coefficients can be obtained, first, for a sample containing almost no fluorescent whitening agent, the reference colorimeter 80 shown in FIG.
And the spectral reflectance measuring device 20 measures the spectral reflectance.

When the first correction coefficient is obtained, the ratio of the spectral reflectance measured by each of the reference colorimetric device 80 and the spectral reflectance measuring device 20 is obtained as a function of the wavelength of light. , And this ratio is used as a first correction coefficient.

When the second correction coefficient is obtained, the ratio of the value obtained by integrating the spectral reflectance measured by each of the reference colorimetric device 80 and the spectral reflectance measuring device 20 in the visible light region is obtained. And this ratio is used as a second correction factor.

When the third correction coefficient is determined, the sample under the predetermined observation light source is determined based on the spectral reflectance measured by the reference colorimetric device 80 and the spectral reflectance measured by the spectral reflectance measuring device 20, respectively. The tristimulus value of the color is calculated, and the ratio between the tristimulus value based on the spectral reflectance by the reference colorimeter 80 and the tristimulus value based on the spectral reflectance by the spectral reflectance measurement device 20 is calculated. Is used as a third correction coefficient.

By using these correction coefficients for canceling the difference between the measuring instruments, the above-described correction coefficient Ecp for colorimetry using the spectral reflectance measuring device 20 is used.
Etc. are required accurately.

FIG. 8 is a diagram showing an embodiment of the coefficient calculation program storage medium of the present invention.

FIG. 8 shows the CD-ROM 6 shown in FIG.
1 shows a hard disk device 100 in which a coefficient calculation program stored in No. 1 is installed.

The coefficient calculation program 110 stored in the hard disk device 100 includes the spectral reflectance acquiring means 11.
1, a tristimulus value acquiring means 112, a calculating means 113 and other means are provided. Spectral reflectance acquisition means 11
1 corresponds to steps S201 and S202 in FIG.
The tristimulus value acquiring unit 112 acquires the colorimetric value measured in step S203, and the calculating unit 113 acquires the spectral reflectance measured in step S203.
It is means for executing steps 204 to S206.

Other means constituting the coefficient calculation program 110 shown in FIG. 8 include, for example, means for downloading the calculated correction coefficients and the like to a floppy disk.

[0066]

As described above, according to the colorimetric apparatus and the colorimetric method of the present invention, accurate colorimetric values can be obtained with a simple colorimetric apparatus.

Further, according to the coefficient calculating method and the coefficient calculating apparatus of the present invention, it is possible to calculate the correction coefficient used in such a color measuring apparatus and the color measuring method.

Further, the coefficient calculation program stored in the coefficient calculation program storage medium of the present invention can operate a computer system as such a coefficient calculation device.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a colorimetric device of the present invention.

FIG. 2 is a hardware configuration diagram of the personal computer shown in FIG.

FIG. 3 is a flowchart of a color measurement performed by the color measurement device.

FIG. 4 is a configuration diagram of a coefficient calculation system including an embodiment of a coefficient calculation device according to the present invention.

FIG. 5 is an external perspective view of the computer shown by one block in FIG.

FIG. 6 is a hardware configuration diagram of a computer shown by one block in FIG.

FIG. 7 is a flowchart illustrating a calculation procedure of a correction coefficient and the like by the coefficient calculation system.

FIG. 8 is a diagram showing an embodiment of a coefficient calculation program storage medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Colorimeter 20 Spectral reflectance measuring device 21 Spectrophotometer 22 Table 30 Personal computer 31 Main body 31a CD-ROM loading port 32 Liquid crystal display 32a Liquid crystal screen 33 Keyboard 34 Pointing device 35 FD drive 40 Color chart 41 Patch 50, 51 Floppy Disk 60, 61 CD-ROM 70 Coefficient calculation system 80 Reference colorimeter 90 Computer 91 Main body 91a Floppy disk loading port 91b CD-ROM loading port 92 Display 93 Keyboard 94 Mouse 95 Bus 100 Hard disk device 110 Coefficient calculation program 111 Spectral reflectance Acquisition means 112 Tristimulus value acquisition means 113 Calculation means 311,911 CPU 312 Main memory 313 Hard disk drive 315 915 CD-ROM drive 316,916 I / O interface 317 bus 914 FD drive

Claims (7)

[Claims] 1. A method for measuring a spectral reflectance of a sample by irradiating the sample with measurement light and spectrally measuring light reflected by the sample. The first light having a relatively high light intensity in an ultraviolet region. A spectral reflectance measuring unit capable of performing both a measurement performed by irradiating the measurement light of the above and a measurement performed by irradiating the second measurement light having a relatively low light intensity in the ultraviolet region; The sample is irradiated with the first measurement light by the spectral reflectance measuring unit, and the apparent first spectral reflectance measured by spectrophotometrically measuring the mixed light of the reflected light and the fluorescent light, An apparent second spectrum measured by irradiating the fluorescent sample with the second measurement light by the spectral reflectance measuring unit and spectrally measuring light obtained by mixing reflected light and fluorescence. The reflectance and the input are input, and a predetermined observation light irradiates the fluorescent sample. At least one of the tristimulus values X, Y, and Z representing the color of the fluorescent sample at the time of the emission, the one tristimulus value W and the fluorescence contained in the fluorescent sample. An observation light excitation energy Eil at which a substance is excited by the observation light;
A predetermined correction coefficient Ecp, a measurement light excitation energy Eu for exciting a fluorescent substance contained in the fluorescent sample by the first measurement light, and a true spectral reflectance equal to the first spectral reflectance. The one of the tristimulus values Xu, Yu, and Zu representing the color of the first substance when the first measurement light is applied to the virtual first substance having a reflectance. And the tristimulus value Wu corresponding to the first measurement light when the first measurement light is applied to a virtual second substance having the same spectral reflectance as the second spectral reflectance as a true spectral reflectance. Tristimulus values Xuv, Yu representing the color of the second substance
v, Zuv, a tristimulus value Wuv corresponding to the one tristimulus value W, and a tristimulus value X0, representing a color of the second substance when the second substance is irradiated with the observation light. Y0,
A tristimulus value W corresponding to the one tristimulus value W in Z0
0 and W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
and a tristimulus value calculation unit that calculates so as to satisfy the relationship u. 2. A fluorescent sample containing a fluorescent substance is irradiated with a first measurement light having a relatively high light intensity in an ultraviolet region among two measurement lights having different light intensities in an ultraviolet region. A first measurement step of measuring an apparent first spectral reflectance by spectrophotometrically measuring light mixed with light reflected by the fluorescent sample and fluorescence, and for the fluorescent sample, The apparent second spectral reflectance is measured by irradiating a second measurement light having a relatively low light intensity in an ultraviolet region and spectrally measuring light obtained by mixing light reflected by the fluorescent sample and fluorescence. A second measurement step of performing at least one tristimulus value W among tristimulus values X, Y, and Z representing a color of the fluorescent sample when a predetermined observation light is applied to the fluorescent sample; The one tristimulus value W,
Observation light excitation energy Eil at which the fluorescent substance contained in the fluorescent sample is excited by the observation light, a predetermined correction coefficient Ecp, and the fluorescent substance contained in the fluorescent sample is excited by the first measurement light. The first measurement is performed on a virtual first substance having, as a true spectral reflectance, the measured light excitation energy Eu and the same spectral reflectance as the first spectral reflectance measured in the first measuring step. A tristimulus value Xu, which represents the color of the first substance when irradiated with light.
A tristimulus value Wu corresponding to the one tristimulus value W of Yu and Zu, and a second tristimulus value Wu measured in the second measurement step.
The tristimulus value Xuv representing the color of the second substance when the first measurement light is irradiated on the virtual second substance having the same spectral reflectance as the true spectral reflectance of the second substance. , Y
uv, Zuv, a tristimulus value Wuv corresponding to the one tristimulus value W, and a tristimulus value X0, which represents a color of the second substance when the second substance is irradiated with the observation light. Y
0, Z0 and the tristimulus value W0 corresponding to the one tristimulus value W, W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
a tristimulus value calculating step of calculating so as to satisfy u. 3. A first measurement light having a relatively high light intensity in an ultraviolet region among two predetermined measurement lights having different light intensities in an ultraviolet region is irradiated on a fluorescent sample containing a fluorescent substance, A first spectral reflectance obtaining step of obtaining an apparent first spectral reflectance measured by spectrophotometrically measuring light obtained by mixing light reflected by the fluorescent sample and fluorescent light; The second measurement light, of which the light intensity in the ultraviolet region is relatively low, is irradiated on the fluorescent sample, and apparently, the mixed light of the reflected light and the fluorescent light of the fluorescent sample is measured by spectrophotometry. A second spectral reflectance acquiring step of acquiring a second spectral reflectance of the three stimulus values X, Y, and Z representing the color of the fluorescent sample when the fluorescent sample is irradiated with predetermined observation light. Acquire at least one tristimulus value W Tristimulus value obtaining step, and the three tristimulus values W obtained by the stimulus value obtaining step, the observed excitation energy Eil a fluorescent substance contained in the fluorescent sample is excited by the observation light
And a measurement light excitation energy Eu in which a fluorescent substance contained in the fluorescent sample is excited by the first measurement light.
Irradiating the first measurement light to a virtual first substance having, as a true spectral reflectance, the same spectral reflectance as the first spectral reflectance acquired in the first spectral reflectance acquiring step. Tristimulus values Xu, Y representing the color of the first substance when
u and Zu, the true stimulus reflectance Wu corresponding to the one stimulus value W and the same spectral reflectance as the second spectral reflectance acquired in the second spectral reflectance acquiring step. Tristimulus value X representing the color of the second substance when the first measurement light is applied to the virtual second substance having the ratio
a tristimulus value Wuv corresponding to the one tristimulus value W among uv, Yuv, and Zuv, and a tristimulus value representing a color of the second substance when the second substance is irradiated with the observation light. X
Of the 0, Y0, Z0 and the tristimulus value W0 corresponding to the one tristimulus value W, the correction coefficient Ecp is expressed as: W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
u, the value of the correction coefficient Ecp, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu,
At least one of a value of a ratio of a difference between the observation light excitation energy Eil and the correction coefficient Ecp to the measurement light excitation energy Eu, and a coefficient value obtained by combining the correction coefficient Ecp, the observation light excitation energy Eil, and the measurement light excitation energy Eu by four arithmetic operations. A coefficient calculating method, comprising a calculating step of calculating the one value. 4. A plurality of types of fluorescent samples containing different fluorescent substances are present as the fluorescent samples, and the first spectral reflectance obtaining step includes the step of obtaining spectral reflectances measured for each of the plurality of types of fluorescent samples. The second spectral reflectance obtaining step also obtains the spectral reflectance measured for each of the plurality of types of fluorescent samples, and the calculating step calculates a value of a correction coefficient Ecp, The value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu, the value of the ratio of the difference between the observation light excitation energy Eil and the correction coefficient Ecp and the measurement light excitation energy Eu, And correction coefficient Ec
4. The method according to claim 1, wherein at least one of the values of coefficients obtained by combining p, observation light excitation energy Eil, and measurement light excitation energy Eu by four arithmetic operations is calculated for each of the plurality of types of fluorescent samples. 3. The coefficient calculation method according to 3. 5. A combination of the first measurement light and the second measurement light includes a plurality of combinations having different spectra of the measurement light, and the first spectral reflectance obtaining step includes: Acquiring the measured spectral reflectance by irradiating the first measurement light of each of the combinations; and the second spectral reflectance obtaining step also includes irradiating the second measurement light of each of the plurality of combinations. And calculating the measured spectral reflectance. The calculating step includes calculating a value of the correction coefficient Ecp, a value of a difference between the observation light excitation energy Eil and the correction coefficient Ecp, and a ratio of the correction coefficient Ecp to the measurement light excitation energy Eu. , The value of the ratio between the difference between the observation light excitation energy Eil and the correction coefficient Ecp and the measurement light excitation energy Eu, and the correction coefficient Ec
4. The method according to claim 3, wherein at least one of the values of coefficients obtained by combining p, observation light excitation energy Eil, and measurement light excitation energy Eu by four arithmetic operations is calculated for each of the plurality of combinations. Coefficient calculation method described. 6. A first measurement light having a relatively high light intensity in an ultraviolet region among two predetermined measurement lights having different light intensities in an ultraviolet region is irradiated on a fluorescent sample containing a fluorescent substance, First spectral reflectance acquiring means for acquiring an apparent first spectral reflectance measured by spectrophotometrically measuring light obtained by mixing light reflected by the fluorescent sample and fluorescent light; The second measurement light, of which the light intensity in the ultraviolet region is relatively low, is irradiated on the fluorescent sample, and the apparent light measured by spectrophotometrically mixing the light reflected by the fluorescent sample and the fluorescent light is mixed. A second spectral reflectance acquisition unit configured to acquire the second spectral reflectance, the tristimulus values X, Y, and Z representing the color of the fluorescent sample when the fluorescent sample is irradiated with predetermined observation light. A triangulation for acquiring at least one of the tristimulus values W Value acquisition means,
And a tristimulus value W obtained by the tristimulus value obtaining means, and an observation light excitation energy Eil at which a fluorescent substance contained in the fluorescent sample is excited by the observation light.
And a measurement light excitation energy Eu in which a fluorescent substance contained in the fluorescent sample is excited by the first measurement light.
Irradiating the first measurement light to a virtual first substance having the same spectral reflectance as the first spectral reflectance acquired by the first spectral reflectance acquiring unit as a true spectral reflectance. Tristimulus value Xu, representing the color of the first substance when
The true stimulus reflectance is obtained by selecting the tristimulus value Wu corresponding to the one tristimulus value W from Yu and Zu and the same spectral reflectance as the second spectral reflectance acquired by the second spectral reflectance acquiring means. The tristimulus value W of the tristimulus values Xuv, Yuv, Zuv representing the color of the virtual second substance having the ratio when the first measurement light is applied to the virtual second substance.
And one of the tristimulus values W0 of the tristimulus values X0, Y0, and Z0 representing the color of the second substance when the observation light is applied to the second substance. And the correction coefficient Ecp with respect to the tristimulus value W0 corresponding to W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
u, the value of the correction coefficient Ecp, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu,
At least one of a value of a ratio of a difference between the observation light excitation energy Eil and the correction coefficient Ecp to the measurement light excitation energy Eu, and a coefficient value obtained by combining the correction coefficient Ecp, the observation light excitation energy Eil, and the measurement light excitation energy Eu by four arithmetic operations. A coefficient calculating device comprising a calculating means for calculating one value. 7. A first measurement light having a relatively high light intensity in an ultraviolet region among two predetermined measurement lights having different light intensities in an ultraviolet region is irradiated on a fluorescent sample containing a fluorescent substance, First spectral reflectance acquiring means for acquiring an apparent first spectral reflectance measured by spectrophotometrically measuring light obtained by mixing light reflected by the fluorescent sample and fluorescent light; The second measurement light, of which the light intensity in the ultraviolet region is relatively low, is irradiated on the fluorescent sample, and the apparent light measured by spectrophotometrically mixing the light reflected by the fluorescent sample and the fluorescent light is mixed. A second spectral reflectance acquisition unit configured to acquire the second spectral reflectance, the tristimulus values X, Y, and Z representing the color of the fluorescent sample when the fluorescent sample is irradiated with predetermined observation light. A triangulation for acquiring at least one of the tristimulus values W Value acquisition means,
And a tristimulus value W obtained by the tristimulus value obtaining means, and an observation light excitation energy Eil at which a fluorescent substance contained in the fluorescent sample is excited by the observation light.
And a measurement light excitation energy Eu in which a fluorescent substance contained in the fluorescent sample is excited by the first measurement light.
Irradiating the first measurement light to a virtual first substance having the same spectral reflectance as the first spectral reflectance acquired by the first spectral reflectance acquiring unit as a true spectral reflectance. Tristimulus value Xu, representing the color of the first substance when
The true stimulus reflectance is obtained by selecting the tristimulus value Wu corresponding to the one tristimulus value W from Yu and Zu and the same spectral reflectance as the second spectral reflectance acquired by the second spectral reflectance acquiring means. The tristimulus value W of the tristimulus values Xuv, Yuv, Zuv representing the color of the virtual second substance having the ratio when the first measurement light is applied to the virtual second substance.
And one of the tristimulus values W0 of the tristimulus values X0, Y0, and Z0 representing the color of the second substance when the observation light is applied to the second substance. And the correction coefficient Ecp with respect to the tristimulus value W0 corresponding to W = W0 + (Eil−Ecp) × (Wu−Wuv) / E
u, the value of the correction coefficient Ecp, the value of the difference between the observation light excitation energy Eil and the correction coefficient Ecp, the value of the ratio between the correction coefficient Ecp and the measurement light excitation energy Eu,
At least one of a value of a ratio of a difference between the observation light excitation energy Eil and the correction coefficient Ecp to the measurement light excitation energy Eu, and a coefficient value obtained by combining the correction coefficient Ecp, the observation light excitation energy Eil, and the measurement light excitation energy Eu by four arithmetic operations. A coefficient calculation program storage medium, wherein a coefficient calculation program including calculation means for calculating one value is stored.