JP2020085740A - Color measuring device, and determination device of achieving degree of processing - Google Patents

Abstract

To provide a determination device for determining the achieving degree of a predetermined processing at a high accuracy.SOLUTION: A determination device determines the achieving degree of a predetermined processing with test paper having a color region in which the color changes in accordance with the achieving degree of a predetermined processing. The determination device includes: measuring means for measuring an optical characteristic value of a measurement region including the color region of test paper; holding means for holding determination information showing the relationship between the area of the color region and the optical characteristic value in the measurement region, for each of a plurality of achieving degrees of the predetermined processing; and determining means for determining the achieving degree of the predetermined processing, on the basis of the optical characteristic value of the measurement region of the test paper measured by the measuring means and the determination information.SELECTED DRAWING: Figure 6

Description

The present invention relates to a color measurement technique and a technique for determining the degree of achievement of a predetermined process.

BACKGROUND ART The object to be sterilized in a container is sterilized by exposing the object to be sterilized to an atmosphere such as high-pressure steam or hydrogen peroxide. At this time, a chemical indicator for sterilization (hereinafter, CI) is used in order to easily determine the degree of achievement of the sterilization process on the sterilization target. The CI has a discolored area that discolors in accordance with the degree of achievement of the conditions required for sterilization treatment with a sterilizing agent (steam, hydrogen peroxide, etc.). The degree of achievement of the sterilization process is performed by determining the color change in the CI discolored area, but an erroneous determination may occur in the visual determination. Therefore, Patent Document 1 discloses a measuring device which optically measures the degree of achievement of the sterilization process by reading the color of the CI discolored area.

JP, 2003-325646, A

The CI discolored area may be formed in a character shape or a plurality of dot shapes in order to allow the user to recognize the discolored area. When the color of such a CI discoloration area is measured by the measuring device disclosed in Patent Document 1, it is measured according to the ratio of the discoloration area (colorimetry target area) included in the measuring area of the measuring device and the background thereof. The results (colorimetric results) may differ. This leads to an erroneous determination of the degree of achievement of a predetermined process such as a sterilization process. In order to reduce the probability of erroneous determination, it is necessary to suppress the deterioration of the accuracy of the color measurement result even if the ratio of the background included in the measurement region changes.

The present invention provides a determination device that determines the degree of achievement of a predetermined process with high accuracy. The present invention also provides a colorimetric device that can suppress a decrease in the accuracy of the colorimetric result even if the ratio of the background included in the measurement region changes.

According to one aspect of the present invention, the determination device that determines the degree of achievement of the predetermined process with a test paper having a color-changing area in which the color changes according to the degree of achievement of the predetermined processing is Measuring means for measuring the optical characteristic value of the measurement area including, for each of the plurality of achievement degree of the predetermined processing, holds determination information indicating the relationship between the area of the color change area and the optical characteristic value in the measurement area. A holding unit, a determination unit that determines the degree of achievement of the predetermined process based on the optical characteristic value of the measurement region of the test paper measured by the measurement unit and the determination information. It is characterized by

According to the present invention, the degree of achievement of a predetermined process can be determined with high accuracy. Further, according to the present invention, even if the ratio of the background included in the measurement region changes, it is possible to suppress a decrease in accuracy of the color measurement result.

The block diagram of the determination device by one Embodiment. FIG. 6 illustrates a CI according to one embodiment. Explanatory drawing of the determination method of the achievement degree by one Embodiment. FIG. 6 is a diagram showing a relationship between CI and a measurement region according to an embodiment. The figure which shows the spectral reflectance of the color of a discoloration area|region about several area ratios of the groundwork in a measurement area|region. The figure which shows the determination information by one Embodiment. FIG. 6 illustrates a CI according to one embodiment. The figure which shows the spectral reflectance of the color of the discoloration area|region in each achievement degree. The figure which shows the determination information by one Embodiment. FIG. 6 illustrates a CI according to one embodiment.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. The following embodiments are exemplifications, and the present invention is not limited to the contents of the embodiments. Further, in each of the following drawings, components that are not necessary for explaining the embodiment are omitted from the drawings.

<First embodiment>
FIG. 1A and FIG. 1B are a side view and a front view of a determination device 1 for determining the degree of achievement of sterilization processing according to this embodiment. Further, FIG. 1C is a cross-sectional view taken along line AA of FIG. The determination device 1 includes an insertion portion 4 of the CI 2 and a pair of conveyance rollers 6 that conveys the CI 2 inserted in the insertion portion 4 to a downstream measurement position. As shown in FIG. 1(A), when the measurer inserts CI2 from the insertion section 4, the conveyance roller pair 6 conveys CI2 to the measurement position shown by the solid line in FIG. 1(C). The spectrometer 3 is arranged on the opposite side of the measurement position. The spectrometer 3 irradiates the surface of the CI 2 with the light 7 and receives the reflected light to measure the spectral reflectance of the CI 2 in the discolored region. After the measurement, the CI 2 is ejected from the determination device 1 by the reverse rotation of the transport roller pair 6. The control unit 8 controls the determination device 1. The control unit 8 includes a storage unit 9 that holds various types of information used for determining the degree of achievement of color measurement and sterilization processing, and an arithmetic processing unit 10 that performs various types of arithmetic processing. The determination device 1 also includes a display unit 5. The control unit 8 divides the determination result, for example, the degree of achievement of the sterilization process into predetermined stages, and displays it on the display unit 5 as the sterilization level.

FIG. 2 shows a CI 2 according to this embodiment. CI2 is a sheet-shaped test paper, and has a discolored area 21 whose surface is chemically treated. In the example of FIG. 2, the discolored area 21 is a character portion displayed with the English character "TEST". The color of the discolored area 21 changes according to the degree of achievement of the sterilization process. As shown in FIG. 3, in the present embodiment, the color change area 21 of the CI2 is the color C#1 in the initial state, and changes from the color C#2 to the color C#9 according to the degree of achievement of the sterilization process. Finally, the color C#10 is assumed to be constant. Hereinafter, the condition achievement level when the color is C#k (k is an integer from 1 to 10) is referred to as the achievement level #k. It should be noted that the color of the discolored area 21 is not one of a predetermined number of colors (10 in FIG. 3, C#1 to C#10) as shown in FIG. 3, but colors C#1 to C#. It changes continuously to 10. That is, the color change area 21 can also take a color between the color C#m (m is an integer from 1 to 9) and the color C#m+1. In the present embodiment, the degree of achievement of the sterilization process is evaluated in 9 stages. Specifically, when the color of the discolored area 21 measured by the spectrometer 3 is within the range of C#m to C#m+1, the sterilization level is determined to be level #m. Then, for example, the levels #8 and #9 are set to the OK level, and the levels #1 to #7 are set to the NG level. Therefore, the level #m of the sterilization processing means that the degree of achievement of the sterilization processing is within the range of #m to #m+1.

Here, the region of CI2 (hereinafter, measurement region) measured by the spectrometer 3 is a part of the color change region 21 of CI2. FIG. 4 shows an example of the relationship between the measurement area 31 and the color change area 21. In the present embodiment, as shown in FIG. 4, it is assumed that the measurement region 31 is located in the vicinity of the vertical line of the character “T” when the CI 2 is transported to the measurement position by the transport roller pair 6. However, the relative positional relationship between the measurement region 31 and the CI2 may be different for each measurement due to variations in the transport state of the CI2 to the measurement position, variations in the size of the individual CI2, and the like. For example, in some cases, the area indicated by the dotted rectangle in FIG. 4 can be the measurement area. Here, the spectral reflectance measured by the spectrometer 3 differs depending on the area of the discoloration area 21 (character portion) in the measurement area 31 and the area size of the base region (portion having no character). Therefore, in the present embodiment, a lookup table (LUT) described below is created as determination information, and the created LUT is stored in the storage unit 9 of the control unit 8 in advance. Then, the arithmetic processing unit 10 of the control unit 8 determines the level of sterilization processing using the LUT. The method of creating the LUT will be described below.

First, the spectral reflectance of only the background portion of CI2 (100% of the background) and the spectral reflectance of only the discolored area 21 (character portion) (0% of the background) for each of 10 achievement levels #1 to #10, That is, the spectral reflectances of the colors C#1 to C#10 are measured. Then, for each of the achievement levels #1 to #10, the spectral reflectance of the background portion (100% of the background) and the spectral reflectance of the color C#k (k is an integer from 1 to 10) (0% of the background) are calculated. , Divided into a predetermined number at equal intervals. In this embodiment, the area is divided into 10 areas. As a result, for each achievement level, as shown in FIG. 5, the ratio of the base is 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%. The spectral reflectance at each% can be obtained. Note that the table in FIG. 5 is for one achievement level, and in the present embodiment, the achievement level is 10 levels, so the table in FIG. 5 is obtained for each of the achievement levels #1 to #10. Then, a color space value (hereinafter referred to as a color value) L*a*b* is obtained from the spectral reflectance of each background ratio of each achievement level, and the LUT shown in FIG. 6 is generated. As shown in FIG. 6, the LUT is information indicating the relationship between the ratio of the area of the base (or the area of the color changing area 21) in the measurement area 31 and the color value for each of the plurality of achievement levels of the sterilization process.

Next, a method of determining the level of sterilization processing based on the LUT shown in FIG. 6 will be described. First, the control unit 8 measures the spectral reflectance of the measurement area 31 on the CI 2 with the spectrometer 3, and obtains the color value Ct as the measurement result. The control unit 8 obtains the color difference ΔE* between the color value Ct and each color value of the LUT, and determines the achievement level and the base ratio corresponding to the color value of the LUT having the smallest color difference. For example, it is assumed that the smallest color difference from the measured color value Ct is the color value with the achievement level #2 and the background ratio of 20%. In this case, the control unit 8 tentatively determines that the color value Ct is either in the range of achievement level #1 to achievement level #2 or in the range of achievement level #2 to achievement level #3. The control unit 8 also determines that the ratio of the background is 20%. The control unit 8 determines whether it is in the range of achievement level #1 to achievement level #2 or in the range of achievement level #2 to achievement level #3. Therefore, the background ratio of the color value Ct and the achievement level #1 is determined. The color difference ΔE*1 with respect to the color value of 20% is compared with the color difference ΔE*3 with respect to the color value Ct and the color value with the background ratio of the achievement level #3 of 20%. The reason for obtaining the color difference from the color value of the LUT having the background ratio of 20% is that the background ratio that minimizes the color difference from the measured color value Ct was 20%. For example, when ΔE*1 is 12.7 and ΔE*3 is 13.5, the control unit 8 selects the achievement level #1 having a smaller color difference, and thus the color value Ct is the achievement level #1. The range between 1 and achievement level #2, that is, level #1 is finally determined.

If the degree of achievement #1 is that the color difference from the color value Ct is the smallest, the control unit 8 makes a final determination of level #1 without performing a preliminary determination. Similarly, when it is the achievement level #10 that the color difference from the color value Ct becomes the minimum, the control unit 8 makes the final determination of the level #9 without performing the provisional determination. On the other hand, for the achievement level that minimizes the color difference from the color value Ct, if both the achievement level lower than the achievement level and the achievement level higher than the achievement level exist in the LUT, the control unit 8 performs the above-described main determination. Further, when the color difference from the color value Ct is the smallest at 100% of the background, there is a high possibility that the discoloration area 21 is not included in the measurement area 31, so the control unit 8 determines that there is a measurement error. The fact can be displayed on the display unit 5.

With the above configuration, it is possible to suppress the influence of the CI2 base in the measurement region 31 and accurately determine the degree of achievement of the sterilization process. That is, the degree of achievement of the sterilization process can be accurately determined regardless of the shape of the discolored region 21 of the CI 2 used. In the present embodiment, as shown in FIG. 3, the level of sterilization processing was judged at 9 levels. However, the sterilization process can also be determined in 10 stages of achievement level #1 to achievement level #10. In this case, for example, the achievement level at which the color difference from the color value Ct is minimized can be directly used as the achievement level of the sterilization process. Further, in this embodiment, the color value is used for the LUT, and the achievement level of the sterilization process is determined based on the color value and the LUT measured by the spectrometer 3. However, it is also possible to adopt a configuration in which any optical characteristic value obtained from the spectral reflectance is used. Further, the spectral reflectance itself can be used as the optical characteristic value. Further, the control unit 8 can also determine the degree of achievement based on one color value Ct obtained by one measurement by the spectrometer 7 or can determine the achievement level of the plurality of color values Ct obtained by a plurality of measurements by the spectrometer 7. The degree of achievement can also be determined based on the average value.

Note that, for example, the determination device 1 can be configured by a device that determines the level of achievement and a color measurement device that transmits a color measurement result to the device. The configuration of the color measurement device is similar to that of the determination device 1 shown in FIG. The color measurement device, in the columns labeled Achievement Level #1 to Achievement Level #10 shown in FIG. 6, replaces the achievement levels #1 to #10 with the color change area 21 (color measurement target area) in the achievement level. It holds an LUT that stores color values. Hereinafter, the color values (10) stored in the LUT instead of the achievement levels #1 to #10 will be referred to as reference color values. Then, the control unit 8 of the color measurement device measures the spectral reflectance of the measurement region 31 on the CI 2 with the spectrometer 3, and obtains the color value Ct as the measurement result. The control unit 8 obtains the color difference ΔE* between the color value Ct and each color value of the LUT, and determines the reference color value corresponding to the color value of the LUT having the smallest color difference. Then, this reference color value is output as a colorimetric result to a device that determines the level of achievement. With this configuration, even if the ratio of the background included in the measurement region 31 changes, it is possible to prevent the accuracy of the color measurement result from being degraded.

In addition to the color measurement result, the color measurement device can output the ratio of the base determined from the LUT to the device that determines the achievement level of the sterilization process. Then, the device that determines the achievement level determines the achievement level of the sterilization process based on the color measurement result or both the color measurement result and the ratio of the base. Note that the LUT held by the color measurement device is not limited to one that indicates the color value corresponding to the combination of the reference color value and the base ratio. For example, the LUT held by the color measuring device may be one that indicates an arbitrary optical characteristic value corresponding to the combination of the reference color value and the base ratio. Further, the spectral reflectance itself can be used as the optical characteristic value.

<Second embodiment>
Next, the second embodiment will be described focusing on the differences from the first embodiment. FIG. 7 shows CI 2 according to the present embodiment. In the CI 2 according to the present embodiment, the color change area 21 is configured as a plurality of dots.

Also in this embodiment, the spectral reflectance of only the base and the spectral reflectance of only the color-changed area 21 at each achievement level are measured in advance. FIG. 8 shows the measurement result. Subsequently, two wavelengths of the first wavelength and the second wavelength are selected based on the measurement results of the spectral reflectance of the discolored area 21 in the base and each achievement level. Note that how to select the first wavelength and the second wavelength will be described later. In this example, 450 nm is selected as the first wavelength and 530 nm is selected as the second wavelength. Then, for each achievement level, the difference between the spectral reflectance of the base and the spectral reflectance of the color changing area 21 at the first wavelength is obtained as the first difference. Similarly, for each achievement level, the difference between the spectral reflectance of the background and the spectral reflectance of the color changing area 21 at the second wavelength is obtained as the second difference. Then, for each achievement level, determination information indicating the ratio of the first difference and the second difference at the same achievement level is created. FIG. 9 shows the determination information. The determination information shown in FIG. 9 and the background information indicating the spectral reflectance of the background at the first wavelength and the second wavelength are stored in the control unit 8 in advance as an LUT.

Next, a method of determining the sterilization level based on the LUT including the background information and the determination information shown in FIG. 9 will be described. First, the control unit 8 measures the spectral reflectance of the measurement region 31 on the CI 2 with the spectrometer 3. Subsequently, the control unit 8 sets the first difference, which is the difference between the spectral reflectance of the background at the first wavelength indicated by the background information and the spectral reflectance of the first wavelength among the measured spectral reflectances, and the background information. The second difference, which is the difference between the spectral reflectance of the base at the second wavelength and the spectral reflectance of the second wavelength among the measured spectral reflectances, is obtained. Then, the control unit 8 determines the level of the sterilization processing by comparing the ratio between the first difference and the second difference with the determination information shown in FIG. 9. For example, when the obtained ratio of the first difference and the second difference is 0.88, it is determined to be level #3 because it is between the achievement level #3 and the achievement level #4. The configuration may be such that the achievement level #3 closest to 0.88 is determined.

Subsequently, a method of selecting the first wavelength and the second wavelength will be described. First, the first wavelength and the second wavelength are selected so that the ratio between the first difference and the second difference in each achievement level is different. By using the ratio of the first difference at the first wavelength and the second difference at the second wavelength thus selected, the influence of the dot pattern in the measurement region 31 and the area ratio of the base is canceled, and the measurement is performed. The sterilization level can be accurately determined regardless of the size of the discolored area 21 in the area 31.

Therefore, as shown in FIG. 8, the first wavelength and the second wavelength are set so that the difference between the spectral reflectance of the base at the first wavelength and the spectral reflectance of the base at the second wavelength becomes smaller than the third predetermined value. You can choose. Thereby, the influence of the area ratio of the base in the measurement region 31 can be further suppressed. Then, for example, with respect to the first wavelength, a wavelength from which a difference in spectral reflectance due to any two achievements is smaller than a first predetermined value is selected, and regarding the second wavelength, spectral reflections due to any two achievements are selected. The wavelength is selected such that the difference in the ratio is larger than the second predetermined value. Thereby, the ratio of the first difference and the second difference can be made different.

Note that, for example, in the vicinity of the wavelength of 500 nm and in the vicinity of the wavelength of 600 nm in FIG. 8, the spectral reflectance varies depending on the degree of achievement, but the spectral reflectance changes largely due to the wavelength variation. When the second wavelength is selected from the wavelengths in such a region, the dispersion of the measurement result of the spectral reflectance increases for each measurement. Therefore, the second wavelength can be selected from a region in which the change (slope) of the spectral reflectance due to the change in wavelength is smaller than the second change amount, for example, the region from wavelength 520 nm to wavelength 570 nm in FIG. .. In the present embodiment, the variation amount means the variation amount of the spectral reflectance with respect to the variation of the wavelength determined from the graph showing the relationship between the wavelength and the spectral reflectance shown in FIG. In other words, for each degree of achievement, the second wavelength is selected so that the difference between the maximum value and the minimum value of the spectral reflectance within the predetermined wavelength range centered on the second wavelength is within the fourth predetermined value. You can

In FIG. 8, in the wavelength region (wavelength 460 nm or less and wavelength 650 or more) in which the difference in spectral reflectance due to the degree of achievement is small, the change in spectral reflectance due to the change in wavelength is small. That is, in FIG. 8, there is no wavelength range in which the difference in spectral reflectance due to the degree of achievement is small, but the change in spectral reflectance due to the change in wavelength is large. However, even if there is such a wavelength range, if the first wavelength is selected from such a wavelength range, the variation in the measurement result of the spectral reflectance between measurements becomes large. Therefore, also for the first wavelength, it is possible to select from a region in which the change in the spectral reflectance due to the change in the wavelength is smaller than the first change amount. In other words, for each achievement level, the first wavelength should be selected so that the difference between the maximum value and the minimum value of the spectral reflectance within the predetermined wavelength range centered on the first wavelength is within the fifth predetermined value. You can The same applies to the spectral reflectance of the base.

<Other forms>
It should be noted that the CI 2 having the plurality of dot-shaped discolored regions 21 shown in the second embodiment can be used for the determination of the degree of achievement of the sterilization process according to the first embodiment. Similarly, the CI 2 having the character-like discolored region 21 shown in the first embodiment can be used to determine the degree of achievement of the sterilization process according to the second embodiment. More generally, in each of the above-described embodiments, the degree of achievement of the sterilization process can be determined by suppressing the influence of the area of the base in the measurement region 31, so that the shape of the color changing region 21 is not limited, and the color change of any shape is possible. CI2 with region 21 can be used. For example, CI2 shown in FIG. 10 can be used to determine the degree of achievement of the sterilization process according to the first embodiment and the second embodiment. In CI 2 of FIG. 10, the character (numeral) “0” and the character “X” are formed on the background, and the character “X” is the discolored area 21. On the other hand, the character "0" indicates the color of the color-change area 21 at a predetermined achievement level and serves as a reference when visually determining the color of the color-change area 21.

Further, in each of the above-described embodiments, the CI 2 has the discolored area 21 of a color different from that of the base, and the color of the discolored area 21 changes according to the degree of achievement of the sterilization process. The color of the discolored area 21 includes transparency. That is, the case where the discolored area 21 is initially transparent and a color appears depending on the degree of achievement of the sterilization treatment is also included in the "discolored" or "color change" of the discolored area 21 in the present invention. Similarly, in the case where the discoloration area 21 is not initially transparent, but the discoloration area 21 becomes transparent depending on the degree of achievement of the sterilization process, the "discoloration" or "color change" of the discoloration area 21 in the present invention. "include. Further, the base portion may be transparent.

Further, for example, the color of the discolored area 21 may be initially the same as the background color. Furthermore, it is not necessary for the entire discolored area 21 to discolor uniformly depending on the degree of achievement of the sterilization process. For example, the entire discolored area 21 may initially be the same as the background color, and the length portion depending on the degree of achievement of sterilization may be changed to a color different from the background. Note that the discolored area 21 may initially have a portion different from the background color, and the length of the portion different from the background color may be longer depending on the degree of achievement of the sterilization process. On the contrary, as the degree of achievement of the sterilization treatment becomes higher, the length of the portion different from the background color may become shorter.

Further, in each of the above-described embodiments, the present invention has been described by taking the determination device that determines the degree of achievement of the sterilization process as an example. However, the present invention can be applied to the determination of the degree of achievement of any treatment in which a test paper having a discolored area whose color changes according to the degree of achievement of treatment is used. Furthermore, the color measurement device described in the first embodiment can be used for color measurement of an arbitrary color measurement object.

The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. It can also be realized by the processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

3: spectrometer, 9: storage unit, 8: control unit

Claims (17)

A determination device for determining the degree of achievement of the predetermined processing by a test paper having a color-changing area in which the color changes in accordance with the degree of achievement of the predetermined processing,
Measuring means for measuring the optical characteristic value of the measurement area including the color change area of the test paper,
For each of the plurality of achievement levels of the predetermined process, a holding unit that holds determination information indicating the relationship between the area of the color-change region and the optical characteristic value in the measurement region,
Based on the optical characteristic value of the measurement area of the test paper measured by the measuring means, and the determination information, the determination means to determine the degree of achievement of the predetermined processing,
A determination device comprising: The determination device according to claim 1, wherein the optical characteristic value of the measurement region is a spectral reflectance of the measurement region. The determination device according to claim 1, wherein the optical characteristic value of the measurement region is a color value obtained from the spectral reflectance of the measurement region. The determining means determines, out of the optical characteristic values indicated by the determination information, a first optical characteristic value that is closest to the optical characteristic value of the measurement area of the test paper measured by the measuring means, and determines the first optical characteristic value. The determination device according to any one of claims 1 to 3, wherein the achievement level of the predetermined process is determined based on a first achievement level corresponding to a characteristic value. In the case where, among the plurality of achievement levels, there are both a second achievement level having a higher achievement level of the predetermined process and a third achievement level having a lower achievement level of the predetermined process than the first achievement level, And a second optical characteristic value when the area of the color change area in the measurement area is the first area corresponding to the first optical characteristic value at the second achievement level indicated by the determination information. , Which is the third achievement level indicated by the determination information, and which is closer to the first optical characteristic value than the third optical characteristic value when the area of the color changing area in the measurement area is the first area If it is determined that the second optical characteristic value is closer to the first optical characteristic value than the third optical characteristic value, the achievement level of the predetermined process is in the range of the first achievement level to the second achievement level. And the third optical characteristic value is closer to the first optical characteristic value than the second optical characteristic value, the achievement degree of the predetermined process is in the range of the first achievement degree to the third achievement degree. The determination device according to claim 4, wherein the determination device determines that it is inside. A determination device for determining the degree of achievement of the predetermined processing by a test paper having a color-changing area in which the color changes in accordance with the degree of achievement of the predetermined processing,
Measuring means for measuring the spectral reflectance of the measurement area including the color change area of the test paper,
Background information indicating a first spectral reflectance at a first wavelength and a second spectral reflectance at a second wavelength of the undercoat of the test paper, and, for each of a plurality of achievement levels of the predetermined process, the discoloration corresponding to the achievement level. A first difference between the spectral reflectance of the color of the area at the first wavelength and the first spectral reflectance, and a spectral reflectance of the color of the color-change area corresponding to the degree of achievement at the second wavelength and the second Holding means for holding determination information indicating a ratio between the second difference from the spectral reflectance and;
A third difference between the first spectral reflectance and the spectral reflectance at the first wavelength measured by the measuring unit, and the second spectral reflectance and the spectral reflectance at the second wavelength measured by the measuring unit. Determination means for determining the degree of achievement of the predetermined process based on the ratio to the fourth difference and the determination information;
A determination device comprising: The determining means determines the achievement level of the predetermined process based on the achievement level corresponding to the ratio closest to the ratio of the third difference and the fourth difference among the ratios indicated by the determination information. The determination device according to claim 6, which is characterized in that. The said 1st wavelength is a wavelength with which the difference of the spectral reflectance of each of several color of the said discoloration area|region corresponding to the said several achievement degree becomes smaller than a 1st predetermined value, It is characterized by the above-mentioned. The determination device described. 9. The second wavelength is a wavelength at which a difference in spectral reflectance of each of the plurality of colors in the color changing region corresponding to the plurality of achievements is larger than a second predetermined value. The determination device according to any one of claims. 10. The change amount of the spectral reflectance of the color with respect to the color of the color change region of each of the plurality of achievement levels is smaller than the first change amount at the first wavelength, according to any one of claims 6 to 9. The determination device according to item 1. 11. Regarding the color of the color change area of each of the plurality of achievement levels, the change amount of the spectral reflectance of the color due to the wavelength is smaller than the second change amount at the second wavelength. The determination device according to item 1. The determination device according to any one of claims 6 to 11, wherein a difference between the first spectral reflectance and the second spectral reflectance is smaller than a third predetermined value. The determination device according to claim 1, wherein the predetermined process is a sterilization process. Measuring means for measuring the optical characteristic value of the measurement region including the color measurement target region,
For each of the plurality of reference colors, a holding unit that holds determination information indicating the relationship between the area of the color measurement target region in the measurement region and the optical characteristic value,
Based on the optical characteristic value of the measurement region measured by the measuring unit, and the determination information, as a color measurement result of the color measurement target region, a selection unit for selecting one of the plurality of reference colors,
A colorimetric device characterized by being equipped with. The color measurement device according to claim 14, wherein the optical characteristic value of the measurement region is a spectral reflectance of the measurement region. The colorimetric apparatus according to claim 14, wherein the optical characteristic value of the measurement region is a color value obtained from the spectral reflectance of the measurement region. The selecting means determines, out of the optical characteristic values indicated by the determination information, a first optical characteristic value that is closest to the optical characteristic value of the measurement region measured by the measuring means, and corresponds to the first optical characteristic value. The colorimetric apparatus according to claim 14, wherein a reference color to be selected is selected.

Images