CN107709941B - Optical characteristic measuring device and method for setting optical characteristic measuring device - Google Patents
Optical characteristic measuring device and method for setting optical characteristic measuring device Download PDFInfo
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/38—Photometry, e.g. photographic exposure meter using wholly visual means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters
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Abstract
The optical characteristic measuring device includes: an input unit for inputting the 1 st exposure time and the 1 st cumulative count for measurement using the spectroscopic sensor; a calculation unit that calculates a measurement time (1 st measurement time) of a measurement using the spectroscopic sensor using the input 1 st exposure time and the 1 st cumulative count; and a determination unit configured to determine at least one of the 2 nd exposure time and the 2 nd cumulative count in the measurement using the two-dimensional imaging sensor so as to reduce or eliminate a difference between the 1 st measurement time and a measurement time (2 nd measurement time) of the measurement using the two-dimensional imaging sensor.
Description
Technical Field
The present invention relates to a technique for measuring optical characteristics of a screen of a display, for example.
Background
The optical property measurement device is a device that measures an optical property (e.g., color, brightness, gloss) using an optical sensor. A two-dimensional color measuring instrument is one of optical characteristic measuring devices, and performs measurement relating to the color of a measuring surface. Two-dimensional color measuring instruments are used in various industrial fields, for example, for measuring the chromaticity distribution of a screen of a display.
In view of the characteristic that the spectroscopic sensor can measure the color of a measurement point (in other words, a point region) with high accuracy, there has been proposed a two-dimensional color measuring instrument in which the spectroscopic sensor and an imaging unit that images a two-dimensional color image are combined. For example, patent document 1 discloses a two-dimensional color measuring instrument including: a beam splitter that divides light from a measurement object into two parts; an imaging unit for receiving the one path of light obtained by the two divisions; a spectroscopic sensor for receiving the other path of light obtained by the two divisions; and a calculation unit that calculates a tristimulus value using the spectral distribution of the measurement point measured by the spectral sensor, and calculates a tristimulus value of each pixel using the tristimulus value and data of each pixel of the measurement area imaged by the imaging unit. The imaging unit is a sensor in which a monochrome CCD sensor and a filter approximating a color matching function of an XYZ chromaticity diagram are combined.
According to the two-dimensional color measuring instrument, measurement using an imaging unit including a CCD sensor and measurement using a spectroscopic sensor are performed separately. In the measurement using these optical sensors (CCD sensor, spectroscopic sensor), the exposure time and the number of times of integration are set. The exposure time is the time during which the optical sensor is exposed during the measurement. The two-dimensional color measuring instrument performs a plurality of measurements and accumulates the measured values in each measurement, thereby reducing the error of the measured values. The number of accumulations is the number of accumulated measurements. The measurement value obtained by the integration may be directly sent to the next process, or an average value obtained by dividing the measurement value obtained by the integration by the number of times of integration may be sent to the next process.
The measurement time of the measurement using the optical sensor depends on the exposure time and the number of integration times, and when the exposure time is increased or the number of integration times is increased, the measurement time becomes long. In contrast, when the exposure time is shortened or the number of times of integration is reduced, the measurement time becomes short.
In the two-dimensional color measuring instrument, a predetermined exposure time and an accumulated number of times are set for the imaging unit and the spectroscopic sensor, respectively. The present inventors found that, when a measurer sets the exposure time and the number of accumulations for each of these optical sensors, there is a case where a large difference is generated between the measurement time of measurement using one optical sensor and the measurement time of measurement using another optical sensor. The optical sensor having a short measurement time of the two optical sensors must be on standby during this period. When a large difference occurs between the measurement times of the two optical sensors, the standby time of the optical sensor having a short measurement time becomes long, and the utilization efficiency of the optical sensor deteriorates.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3246021 Specification
Disclosure of Invention
The invention aims to provide an optical characteristic measuring device and a setting method of the optical characteristic measuring device, which can prevent the generation of long standby time in any optical sensor when two optical sensors are used for measuring optical characteristics.
The present invention for achieving the above object provides an optical characteristic measuring apparatus comprising: a 1 st optical sensor that takes a two-dimensional region in a measurement object as a measurement range; a 2 nd optical sensor having a point region included in the two-dimensional region and narrower than the two-dimensional region as a measurement range; an input section to which a 1 st exposure time and a 1 st cumulative count are input with respect to a measurement using one of the 1 st optical sensor and the 2 nd optical sensor; a calculation section that calculates a 1 st measurement time using the 1 st exposure time and the 1 st cumulative number input to the input section, the 1 st measurement time being a measurement time of a measurement using the one optical sensor; and a determination unit configured to determine at least one of a 2 nd exposure time and a 2 nd cumulative count in a measurement using the other of the 1 st optical sensor and the 2 nd optical sensor, in such a manner as to reduce or eliminate a difference between the 1 st measurement time and the 2 nd measurement time, the 2 nd measurement time being a measurement time of the measurement using the other optical sensor.
The above and other objects, features and advantages of the present invention will be further apparent from the following detailed description and the accompanying drawings.
Drawings
Fig. 1 is a block diagram showing the configuration of an optical characteristic measurement device according to the present embodiment.
Fig. 2 is an explanatory diagram for explaining functional blocks of the control processing unit.
Fig. 3 is a graph showing the tristimulus value R, G, B of a certain pixel among the pixels of the measurement region photographed (measured) by the two-dimensional imaging sensor.
Fig. 4 is a graph showing a color matching function of an XYZ chromaticity diagram.
Fig. 5 is a comparison graph comparing a measurement time of a measurement using a spectroscopic sensor and a measurement time of a measurement using a two-dimensional imaging sensor.
Fig. 6 is a flowchart illustrating a process of setting the exposure time and the cumulative count in the measurement using the spectroscopic sensor and the exposure time and the cumulative count in the measurement using the two-dimensional imaging sensor in the control processing section in the present embodiment.
Fig. 7 is a comparison diagram comparing the measurement time of the measurement using the spectroscopic sensor and the measurement time of the measurement using the two-dimensional imaging sensor in the present embodiment.
Fig. 8 is a flowchart illustrating a process of setting, in the control processing unit, the exposure time and the cumulative count in the measurement using the spectroscopic sensor and the exposure time and the cumulative count in the measurement using the two-dimensional imaging sensor in modification 1 of the present embodiment.
Fig. 9 is a 1 st comparison diagram comparing a measurement time of measurement using a spectroscopic sensor and a measurement time of measurement using a two-dimensional imaging sensor in modification 1.
Fig. 10 is a 2 nd comparison diagram comparing the measurement time of the measurement using the spectroscopic sensor and the measurement time of the measurement using the two-dimensional imaging sensor in modification 1.
Fig. 11 is a flowchart illustrating a process of setting, in the control processing unit, the exposure time and the cumulative count in the measurement using the spectroscopic sensor and the exposure time and the cumulative count in the measurement using the two-dimensional imaging sensor in modification 2 of the present embodiment.
Fig. 12 is a graph showing a relationship among exposure time, the number of accumulations, and measurement time in measurement using a spectroscopic sensor.
Fig. 13 is a diagram showing an example of a table used to determine the exposure time and the number of accumulations in the measurement using the two-dimensional imaging sensor.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a block diagram showing the configuration of an optical characteristic measurement device 1 of the present embodiment. The optical characteristic measurement device 1 is a two-dimensional color measuring instrument that measures a light source color, and includes a light receiving unit 2 and a main body unit 3.
The measurement target of the optical characteristic measurement device 1 is the optical characteristics (for example, brightness and color tone) of various light-emitting bodies. The brightness indicates the luminance or luminosity of the light-emitting body. Hue denotes the chromaticity coordinates, dominant wavelength, stimulus purity, correlated color temperature of the illuminant. The measurement target will be described by taking the screen of the flat panel display 4 as an example.
The light receiving unit 2 includes an optical lens 5, a beam splitter 6, a color filter 7, a two-dimensional imaging sensor 8, and a spectroscopic sensor 9. In the present embodiment, the two-dimensional imaging sensor 8 is the 1 st optical sensor, and is the "other optical sensor". The spectroscopic sensor 9 is the 2 nd optical sensor, and is "one optical sensor".
The optical lens 5 focuses light from the screen of the flat panel display 4. The beam splitter 6 (an example of a light dividing unit) divides the focused light into two. To explain in detail, the beam splitter 6 projects a part of the focused light and reflects the rest of the light. The transmitted light was light L1, and the reflected light was light L2. The beam splitter 6 transmits, for example, ten percent of the focused light and reflects ninety percent.
The light path of the light L1 is provided with an RGB color filter 7 and a two-dimensional imaging sensor 8. The color filter 7 is composed of a filter that transmits the R component, a filter that transmits the G component, and a filter that transmits the B component.
The two-dimensional imaging sensor 8 is, for example, a CCD, and is an optical sensor having a two-dimensional area as a measurement range. The two-dimensional imaging sensor 8 receives the light L1 through the color filter 7, captures the light source color of a two-dimensional area (the whole or a part of the screen of the flat panel display 4) as a measurement range, and generates an electric signal S1 (in other words, a measurement value) representing the image thereof.
The spectroscopic sensor 9 is disposed on the optical path of the light L2. The spectroscopic sensor 9 takes a point region included in the two-dimensional region imaged by the two-dimensional imaging sensor 8 as a measurement range. The dot region has a viewing angle of, for example, 0.1 to 3 degrees, which is narrower than the two-dimensional region.
The spectroscopic sensor 9 generates an electric signal S2 (in other words, a measurement value) indicating the intensity level of each wavelength with respect to the incident light L2. Examples of the spectroscopic sensor 9 include a polychromator using a diffraction grating, a polychromator in which a continuous interference film filter and an SPD (silicon photodiode) are combined, and a tristimulus type in which a filter for three colors is rotated to measure color.
The main body 3 includes a signal processing unit 11, a signal processing unit 12, an AD conversion unit 13, an AD conversion unit 14, a control processing unit 15, an input unit 16, and an output unit 17.
The signal processing unit 11 is an analog circuit that performs predetermined processing on the electric signal (measurement value) S1 output from the two-dimensional imaging sensor 8. The signal processing unit 12 is an analog circuit that performs predetermined processing on the electrical signal (measurement value) S2 output from the spectroscopic sensor 9. These predetermined processes include a process of accumulating measured values. The optical characteristic measurement device 1 performs a plurality of measurements, and integrates the measurement values in each measurement to reduce the error of the measurement values.
The electrical signal S1 processed by the signal processing unit 11 is converted from an analog electrical signal to a digital electrical signal D1 by the AD converter 13, and sent to the control processing unit 15. The electrical signal S2 processed by the signal processing unit 12 is converted from an analog electrical signal to a digital electrical signal D2 by the AD converter 14, and sent to the control processing unit 15.
The control Processing Unit 15 is a microcomputer implemented by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and includes a calculation Unit 21, a determination Unit 22, a storage Unit 23, and a color correction Unit 24 as functional blocks, as shown in fig. 2. The details of these blocks will be described later.
Referring to fig. 1, the control processing unit 15 performs various settings, controls, and processes in the measurement of optical characteristics using the optical characteristic measurement apparatus 1. The control processing section 15 sets, for example, the exposure time and the cumulative count in the measurement using the two-dimensional imaging sensor 8 and the exposure time and the cumulative count in the measurement using the spectroscopic sensor 9.
The control processing unit 15 controls, for example, opening and closing of a 1 st shutter (not shown) and a 2 nd shutter (not shown), the 1 st shutter being disposed on the optical path of the light L1 to make the light L1 enter the two-dimensional imaging sensor 8 or to block the light L1 entering the two-dimensional imaging sensor 8, and the 2 nd shutter being disposed on the optical path of the light L2 to make the light L2 enter the spectroscopic sensor 9 or to block the light L2 entering the spectroscopic sensor 9. The 1 st shutter-open time is the exposure time of the two-dimensional imaging sensor 8, and the 2 nd shutter-open time is the exposure time of the spectroscopic sensor 9.
An electronic shutter may be used instead of the 1 st and 2 nd shutters. That is, the control processing section 15 controls the operations of the 1 st electronic shutter that electrically exposes or electrically shuts off the signal from the two-dimensional imaging sensor 8 and the 2 nd electronic shutter that electrically exposes or shuts off the signal from the spectroscopic sensor 9.
The control processing unit 15 controls the opening and closing of the 1 st shutter so as to be the exposure time of the two-dimensional imaging sensor 8 set by the control processing unit 15, and controls the opening and closing of the 2 nd shutter so as to be the exposure time of the spectroscopic sensor 9 set by the control processing unit 15. The control processing unit 15 controls the signal processing unit 11 so as to be the number of times of integration of the two-dimensional imaging sensor 8 set by the control processing unit 15, and controls the signal processing unit 12 so as to be the number of times of integration of the spectroscopic sensor 9 set by the control processing unit 15.
The control processing unit 15 performs the following processing. The digital signal D1 is a signal obtained by performing integration processing (processing of integrating measured values) or the like by the signal processing unit 11, and indicates a tristimulus value R, G, B indicating a color of each pixel for each pixel in a measurement region imaged (measured) by the two-dimensional imaging sensor 8. Fig. 3 is a graph showing a tristimulus value R, G, B of a certain pixel. The horizontal axis represents wavelength and the vertical axis represents relative sensitivity. The digital signal D2 is a signal obtained by performing integration processing or the like by the signal processing unit 12, and indicates the intensity level of each wavelength with respect to light from the spot area measured by the spectroscopic sensor 9. Fig. 4 is a graph showing a color matching function of an XYZ chromaticity diagram. The map is stored in the control processing unit 15 in advance. In fig. 4, the horizontal axis represents wavelength and the vertical axis represents tristimulus values.
The control processing unit 15 calculates a true value of the tristimulus value X, Y, Z indicating the color of the dot region measured by the spectroscopic sensor 9, using the digital signal D2 and the color matching function of the XYZ colorimetric diagram shown in fig. 4. Then, the control processing unit 15 converts the tristimulus value R, G, B indicating the color of each pixel into a true value of the tristimulus value X, Y, Z with respect to the digital signal D1 using the true value of the tristimulus value X, Y, Z calculated as described above. This enables the information indicating the color of each pixel in the measurement region to be changed from tristimulus value R, G, B to the true value of tristimulus value X, Y, Z.
By the above-described processing, the color data of each pixel of the measurement area captured by the two-dimensional imaging sensor 8 is corrected to color data with high accuracy. This process is performed by the color correction section 24 shown in fig. 2. That is, the color correction section 24 corrects the color data of each pixel of the two-dimensional region including the dot region measured by the two-dimensional imaging sensor 8, using the color data of the dot region measured by the spectroscopic sensor 9. Further, a process similar to this process is described in detail in the above-mentioned patent document 1.
The input unit 16 is a device for inputting instructions (commands), data, and the like from the outside to the optical characteristic measurement device 1, and is, for example, a touch panel, a keyboard, or the like. Alternatively, the input unit 16 may be a device that uses an interface unit (such as a USB terminal) for inputting instructions, data, and the like set by an external controller (such as a personal computer) to the optical characteristic measurement device 1, depending on the object to be measured and the measurement conditions. The output unit 17 is a device for outputting commands and data input from the input unit 16, calculation results of the control processing unit 15, and the like, and is a display device such as an LCD (liquid crystal display) and an organic EL display, or a printing device such as a printer.
The measurement time of the measurement using the optical sensor such as the spectroscopic sensor 9, the two-dimensional imaging sensor 8 is determined from the exposure time in the measurement using the optical sensor and the number of times of accumulation of the measurement values output from the optical sensor. In the present embodiment, in order to simplify the determination of the measurement time, the measurement time is expressed by the following formula (1).
Measurement time exposure time × cumulative number … (1)
Consider the following scenario: the measurer operates the input unit 16 (fig. 1) to input the exposure time and the number of times of integration to the optical characteristic measurement device 1 for each of the spectroscopic sensor 9 and the two-dimensional imaging sensor 8, and sets these values in the control processing unit 15, and the optical characteristic measurement device 1 performs measurement using the spectroscopic sensor 9 and measurement using the two-dimensional imaging sensor 8 in accordance with the setting. Since the characteristics of the spectroscopic sensor 9 are different from those of the two-dimensional imaging sensor 8, the exposure time T1 and the cumulative count N1 in the measurement using the spectroscopic sensor 9, and the exposure time T2 and the cumulative count N2 in the measurement using the two-dimensional imaging sensor 8 are input, respectively.
Fig. 5 is a comparison graph comparing the measurement time of the measurement using the spectroscopic sensor 9 and the measurement time of the measurement using the two-dimensional imaging sensor 8. The number of times of measurement using the spectroscopic sensor 9 is N1, and therefore the number of times of measurement is N1. The number of times of accumulation in the measurement using the two-dimensional imaging sensor 8 is N2, so the number of times of measurement thereof is N2.
The spectroscopic sensor measurement time is longer than the two-dimensional imaging sensor measurement time because the exposure time in the measurement using the spectroscopic sensor 9 is longer than the exposure time in the measurement using the two-dimensional imaging sensor 8. The spectroscopic sensor 9 separates the light L2 (fig. 1) into a plurality of wavelength components, so the light amount of each component relatively decreases. Therefore, the exposure time in the measurement using the spectroscopic sensor 9 becomes long.
When the measurement target is low in luminance, the exposure time is long, so that the difference between the exposure time in the measurement using the two-dimensional imaging sensor 8 and the exposure time in the measurement using the spectroscopic sensor 9 becomes large, and the standby time of the two-dimensional imaging sensor 8 becomes long. This deteriorates the utilization efficiency of the two-dimensional imaging sensor 8.
Therefore, in the present embodiment and the modification described later, in order to reduce or eliminate the difference between the measurement time (1 st measurement time) of the measurement using the spectroscopic sensor 9 (one optical sensor) and the measurement time (2 nd measurement time) of the measurement using the two-dimensional imaging sensor 8 (the other optical sensor), the determination unit 22 (fig. 2) determines at least one of the exposure time and the cumulative count in the measurement using the two-dimensional imaging sensor 8 such that the 2 nd measurement time is longer as the 1 st measurement time is longer and the 2 nd measurement time is shorter as the 1 st measurement time is shorter. That is, the 2 nd measurement time as the measurement time of the measurement using the other optical sensor is determined with reference to the 1 st measurement time as the measurement time of the measurement using the one optical sensor.
An optical sensor that is "one optical sensor" of the two optical sensors is predetermined. If the measurer sets the exposure time and the number of accumulations for each of the two optical sensors, the optical sensor whose measurement time becomes long becomes "one optical sensor". This is known in advance from the characteristics of the two optical sensors. In the present embodiment, the spectroscopic sensor 9 is defined as "one optical sensor" and the two-dimensional imaging sensor 8 is defined as "the other optical sensor".
In the present embodiment, the control processing unit 15 sets the exposure time (1 st exposure time) and the cumulative count (1 st cumulative count) in the measurement using the spectroscopic sensor 9 and the exposure time (2 nd exposure time) and the cumulative count (2 nd cumulative count) in the measurement using the two-dimensional imaging sensor 8. Fig. 6 is a flowchart illustrating this process. Fig. 7 is a comparison diagram comparing the measurement time (2 nd measurement time) of the measurement using the spectroscopic sensor 9 and the measurement time (1 st measurement time) of the measurement using the two-dimensional imaging sensor 8 in the state where the setting of step S8 of fig. 6 is performed.
Referring to fig. 6 and 7, the measurer operates the input unit 16 (fig. 1) to input the exposure time T1 (1 st exposure time) and the cumulative count N1 (1 st cumulative count) during measurement using the spectroscopic sensor 9 and the exposure time T2 (2 nd exposure time) during measurement using the two-dimensional imaging sensor 8 to the optical characteristic measurement apparatus 1 (step S1). Set as exposure time T1> exposure time T2. The number of accumulations in the measurement using the two-dimensional imaging sensor 8 (2 nd accumulation number) is set as the variable accumulation number X.
The calculation section 21 (fig. 2) calculates the measurement time of the measurement using the spectroscopic sensor 9 using the exposure time T1 and the cumulative count N1 input to the input section 16 (step S2). According to the above equation (1), the exposure time T1 × the number of integration N1 is the measurement time of the measurement using the spectroscopic sensor 9.
The calculation unit 21 sets the variable integration number X to 2 (step S3), and calculates the measurement time of the measurement using the two-dimensional imaging sensor 8 (step S4). According to the above equation (1), the exposure time T2 × the variable integration number X is a measurement time of measurement using the two-dimensional imaging sensor 8. Here, the measurement time of the measurement using the two-dimensional imaging sensor 8 is exposure time T2 × 2.
The determination section 22 determines whether or not the measurement time of the measurement using the two-dimensional imaging sensor 8 calculated in step S4 exceeds the measurement time of the measurement using the spectroscopic sensor 9 calculated in step S2 (step S5).
When determining that the measurement time of the measurement using the two-dimensional imaging sensor 8 does not exceed the measurement time of the measurement using the spectroscopic sensor 9 (no in step S5), the determination unit 22 sets the variable integration number X to X +1 (step S6), and returns to step S4. Here, X is 3, and the calculation section 21 calculates the measurement time measured using the two-dimensional imaging sensor 8 (exposure time T2 × 3) (step S4).
When determining that the measurement time of the measurement using the two-dimensional imaging sensor 8 exceeds the measurement time of the measurement using the spectroscopic sensor 9 (yes in step S5), the determination unit 22 determines X-1, which is the number obtained by subtracting one from the variable number of integration times X at that point in time, as the number of integration times N2 in the measurement using the two-dimensional imaging sensor 8 (step S7). In this way, the determination section 22 determines the number of accumulations (2 nd accumulation number) in the measurement using the two-dimensional imaging sensor 8 in such a manner as to avoid the measurement time (2 nd measurement time) of the measurement using the two-dimensional imaging sensor 8 from exceeding the measurement time (1 st measurement time) of the measurement using the spectroscopic sensor 9.
The control processing section 15 sets the exposure time T1 and the cumulative count N1 input in step S1 as the exposure time and the cumulative count in the measurement using the spectroscopic sensor 9, and sets the exposure time T2 input in step S1 and the cumulative count N2 determined in step S7 as the exposure time and the cumulative count in the measurement using the two-dimensional imaging sensor 8 (step S8). As shown in fig. 7, the measurement time of the measurement using the two-dimensional imaging sensor 8 is close to the measurement time of the measurement using the spectroscopic sensor 9.
The optical characteristic measurement apparatus 1 measures the optical characteristic of the screen of the flat panel display 4 under the setting of step S8.
The main effects of the present embodiment will be described. In the present embodiment, the measurer determines the exposure time T1 and the cumulative number N1 in the measurement using the spectroscopic sensor 9 and the exposure time T2 in the measurement using the two-dimensional imaging sensor 8 (step S1). Then, the determination section 22 determines the number of times of integration N2 in the measurement using the two-dimensional imaging sensor 8 so as to be a value that is close to the measurement time in the measurement using the spectroscopic sensor 9, of the values of the measurement time in the measurement using the two-dimensional imaging sensor 8, which can be set (step S7). Therefore, according to the present embodiment, since the difference between the measurement time of the measurement using the spectroscopic sensor 9 and the measurement time of the measurement using the two-dimensional imaging sensor 8 can be reduced, it is possible to prevent a long standby time from occurring in any of the optical sensors when the optical characteristics are measured using the two-dimensional imaging sensor 8 and the spectroscopic sensor 9.
The measurement time of the optical characteristic measurement device 1 is limited to the longer one of the measurement time of the measurement using the spectroscopic sensor 9 and the measurement time of the measurement using the two-dimensional imaging sensor 8. According to the present embodiment, since it is possible to avoid that the measurement time of the measurement using the two-dimensional imaging sensor 8 exceeds the measurement time of the measurement using the spectroscopic sensor 9 (step S2) calculated using the exposure time T1 input by the measurer and the cumulative count N1 (step S5, step S7), it is possible to suppress the measurement time of the optical characteristic measurement apparatus 1 from becoming long.
Further, according to the present embodiment, the determination unit 22 can set, as the measurement time of the measurement using the two-dimensional imaging sensor 8, the value closest to the measurement time of the measurement using the spectroscopic sensor 9, from among the values that can be set as the measurement time of the measurement using the two-dimensional imaging sensor 8, by using step S4, step S5, and step S6. Thus, the measurement time of the measurement using the two-dimensional imaging sensor 8 can be increased as much as possible within a range not exceeding the measurement time of the measurement using the spectroscopic sensor 9 (step S7). This can increase the number of times of integration in the measurement using the two-dimensional imaging sensor 8, and therefore can improve the accuracy of the measurement using the two-dimensional imaging sensor 8.
Optical sensors such as the two-dimensional imaging sensor 8 and the spectroscopic sensor 9 generate a larger noise when the luminance of the measurement target is low than when the luminance of the measurement target is high. In addition, in the apparatus for measuring optical characteristics using two optical sensors as in the present embodiment, since noise is generated in each optical sensor, the noise is superimposed and the noise becomes large. Therefore, when the brightness of the measurement target is low, the measurement accuracy may be lowered. According to the present embodiment, since the number of times of integration in the measurement using the two-dimensional imaging sensor 8 can be increased, the accuracy of the measurement using the two-dimensional imaging sensor 8 can be improved.
According to the present embodiment, when the measurement time of the measurement using the spectroscopic sensor 9 is the same as the measurement time of the measurement using the two-dimensional imaging sensor 8 in step S5, no in step S5, yes in step S6, step S4, and step S5, and step S7 are performed. Therefore, the control processing unit 15 sets the exposure times T1 and T2 and the cumulative counts N1 and N2, which are the same as the measurement time measured by the spectroscopic sensor 9 and the measurement time measured by the two-dimensional imaging sensor 8 (step S8). Thus, since the difference between the measurement time of the measurement using the spectroscopic sensor 9 and the measurement time of the measurement using the two-dimensional imaging sensor 8 is eliminated, the standby time does not occur in either the spectroscopic sensor 9 or the two-dimensional imaging sensor 8.
As described above, according to the present embodiment, since the measurement time for the measurement using the two-dimensional imaging sensor 8 can be increased as much as possible, the accuracy of the measurement using the two-dimensional imaging sensor 8 can be improved. As a result, the reproducibility of the optical characteristic measurement device 1 can be improved. The repeatability is a deviation of the measurement value when the optical characteristic measurement device 1 is used to perform a plurality of measurements.
The present embodiment has modification 1 and modification 2. In modification 1, the measurer specifies the exposure time and the cumulative count during measurement using the spectroscopic sensor 9 and the initial value and the cumulative count of the exposure time during measurement using the two-dimensional imaging sensor 8, and the specifying unit 22 (fig. 2) specifies the exposure time during measurement using the two-dimensional imaging sensor 8. In modification 1, the exposure time is determined in consideration of the flat panel display 4 whose measurement object is operated in a predetermined refresh cycle.
In modification 1, a process in which the control processing unit 15 sets the exposure time (1 st exposure time) and the cumulative count (1 st cumulative count) in the measurement using the spectroscopic sensor 9 and the exposure time (2 nd exposure time) and the cumulative count (2 nd cumulative count) in the measurement using the two-dimensional imaging sensor 8 will be described. Fig. 8 is a flowchart illustrating this process. Fig. 9 is a comparison diagram for comparing the measurement time (2 nd measurement time) of the measurement using the spectroscopic sensor 9 and the measurement time (1 st measurement time) of the measurement using the two-dimensional imaging sensor 8 in a state in which the input of step S11 of fig. 8 is performed. Fig. 10 is a comparison diagram for comparing the measurement time of the measurement using the spectroscopic sensor 9 and the measurement time of the measurement using the two-dimensional imaging sensor 8 in the state in which the setting of step S21 of fig. 8 is performed.
Referring to fig. 8, the measurer operates the input unit 16 (fig. 1) to input the exposure time T1 (1 st exposure time) and the cumulative count N1 (1 st cumulative count) during measurement using the spectroscopic sensor 9 and the initial value of the exposure time T2 (2 nd exposure time) and the cumulative count N2 (2 nd cumulative count) during measurement using the two-dimensional imaging sensor 8 to the optical characteristic measurement apparatus 1 (step S11). Set as the initial value of exposure time T1> exposure time T2.
The input unit 16 receives the value of the integral multiple of the refresh cycle of the flat panel display 4 as the initial values of the exposure time T1 and the exposure time T2.
The calculation section 21 (fig. 2) calculates the measurement time of the measurement using the spectroscopic sensor 9 (step S12). This is the same as step S2. Therefore, the exposure time T1 × the cumulative count N1 becomes the measurement time of the measurement using the spectroscopic sensor 9. As shown in fig. 9, the difference between the measurement time of the measurement using the two-dimensional imaging sensor 8 and the measurement time of the measurement using the spectroscopic sensor 9 is large.
The calculation unit 21 sets the magnification x of the initial value of the exposure time T2 to 2 (step S13), and calculates the variable exposure time (step S14). Here, the initial value × 2 of the exposure time T2 is a variable exposure time. Since the initial value is an integral multiple of the refresh period, the variable exposure time is also an integral multiple of the refresh period. The variable exposure time is an exposure time that is a candidate of the exposure time T2. The initial value × magnification x of the exposure time T2 is a variable exposure time.
The calculation section 21 calculates the measurement time of the measurement using the two-dimensional imaging sensor 8 using the variable exposure time calculated in step S14 and the cumulative number of times N2 input in step S1 (step S15). The determination section 22 determines whether or not the measurement time of the measurement using the two-dimensional imaging sensor 8 calculated in step S15 exceeds the measurement time of the measurement using the spectroscopic sensor 9 calculated in step S12 (step S16).
When determining that the measurement time of the measurement using the two-dimensional imaging sensor 8 does not exceed the measurement time of the measurement using the spectroscopic sensor 9 (no in step S16), the determination unit 22 sets the magnification x to x +1 (step S17), and returns to step S14. Here, x becomes 3, and the calculation unit 21 calculates the variable exposure time (initial value × 3 of exposure time T2) (step S14).
When determining that the measurement time of the measurement using the two-dimensional imaging sensor 8 exceeds the measurement time of the measurement using the spectroscopic sensor 9 (yes in step S16), the determination unit 22 sets the magnification x to x-1 (step S18). Thereby, the determination section 22 can determine the exposure time in the measurement using the two-dimensional imaging sensor 8 in such a manner as to avoid the measurement time (2 nd measurement time) of the measurement using the two-dimensional imaging sensor 8 from exceeding the measurement time (1 st measurement time) of the measurement using the spectroscopic sensor 9.
The determination unit 22 determines whether or not the variable exposure time (the initial value of the exposure time T2 × the magnification x determined in step S18) is shorter than the saturated exposure time previously stored in the storage unit 23 (fig. 2) (step S19). The saturation exposure time refers to an exposure time in which the output from the two-dimensional imaging sensor 8 is saturated.
When determining that the variable exposure time is equal to or longer than the saturated exposure time (no in step S19), the determination unit 22 returns to step S18.
When determining that the variable exposure time is shorter than the saturation exposure time (yes in step S19), the determination section 22 determines the variable exposure time as the measured exposure time T2 using the two-dimensional imaging sensor 8 (step S20). Therefore, the determination unit 22 can determine the exposure time T2 from the variable exposure time that is an integral multiple of the refresh cycle.
The control processing section 15 sets the exposure time T1 and the cumulative count N1 input in step S11 as the exposure time and the cumulative count in measurement using the spectroscopic sensor 9, and sets the cumulative count N2 input in step S11 and the exposure time T2 determined in step S20 as the exposure time and the cumulative count in measurement using the two-dimensional imaging sensor 8 (step S21). As shown in fig. 10, the measurement time of the measurement using the two-dimensional imaging sensor 8 is close to the measurement time of the measurement using the spectroscopic sensor 9.
The optical characteristic measurement apparatus 1 measures the optical characteristic of the screen of the flat panel display 4 under the setting of step S21.
The main effects of modification 1 will be described. In the measurement of the screen of the flat panel display 4 operating at a predetermined refresh period (for example, measurement of chromaticity distribution), when the exposure time N1 and the exposure time N2 are not integral multiples of the refresh period, the exposure time N1 does not match the refresh period and the exposure time N2 does not match the refresh period, so the measurement accuracy is lowered. According to modification 2, a value indicating an integral multiple of the refresh cycle of the flat panel display 4 is input to the input unit 16 as the initial values of the exposure time T1 and the exposure time T2 (step S11). Then, an integral multiple of the initial value of the exposure time T2 is determined as the exposure time T2 (step S18, step S19, step S20). Therefore, the exposure time T1 and the exposure time T2 can be made integral multiples of the refresh cycle, and therefore, a decrease in measurement accuracy can be prevented.
When the exposure time T2 exceeds the saturation exposure time, the measurement using the two-dimensional imaging sensor 8 cannot be accurately performed. According to modification 1, the determination section 22 determines a value smaller than the saturated exposure time as the exposure time T2 (step S19, step S20), so the exposure time T2 can be prevented from exceeding the saturated exposure time.
According to modification 1, with step S18, step S19, and step S20, the determination section 22 can determine, as the exposure time T2, the value closest to the saturated exposure time among the values that can be set to the exposure time T2 in measurement using the two-dimensional imaging sensor 8. The exposure time T2 in the measurement using the two-dimensional imaging sensor 8 can be increased as much as possible, so the accuracy of the measurement using the two-dimensional imaging sensor 8 can be improved.
In modification 2, a process in which the control processing unit 15 sets the exposure time (1 st exposure time) and the cumulative count (1 st cumulative count) in the measurement using the spectroscopic sensor 9 and the exposure time (2 nd exposure time) and the cumulative count (2 nd cumulative count) in the measurement using the two-dimensional imaging sensor 8 will be described. Fig. 11 is a flowchart illustrating this process.
The measurer operates the input unit 16 (fig. 1) to input the exposure time T1 (1 st exposure time) and the cumulative count N1 (1 st cumulative count) during measurement using the spectroscopic sensor 9 to the optical characteristic measurement apparatus 1 (step S31).
While the measurement time of the measurement using the spectroscopic sensor 9 is calculated using the formula in the present embodiment and modification 1, the measurement time of the measurement using the spectroscopic sensor 9 is calculated using the graph in modification 2. Fig. 12 shows an example of the graph. Fig. 12 is a graph showing the relationship of the exposure time T1, the cumulative number of times N1, and the measured time of measurement using the spectroscopic sensor 9. The table is stored in the storage unit 23 (fig. 2) in advance. The horizontal axis of the graph represents the exposure time T1. The vertical axis of the graph is the measurement time of the measurement using the spectroscopic sensor 9. The cumulative number of times N1 is 1, 2, or 3, and the exposure time and the measurement time measured by the spectroscopic sensor 9 are shown in each case. In order to simplify fig. 12, the number of times N1 is shown as 3 times, but the storage unit 23 stores a table of the number of times N1 can be set.
For the measurement time of the measurement using the spectroscopic sensor 9, various processing times are considered in addition to the exposure time T1 and the accumulated number of times N1. The various processing times are, for example, the time required for converting the current, which is an electrical signal output from the spectroscopic sensor 9, into a voltage and the time required for switching the gain. By taking various processing times into account in the measurement time, the measurement time can be made more accurate.
According to the graph shown in fig. 12, the measurement time of the measurement using the spectroscopic sensor 9 can be determined (that is, the measurement time can be calculated) by determining the combination of the exposure time T1 and the cumulative number N1. The calculation unit 21 (fig. 2) calculates the measurement time corresponding to the combination of the exposure time T1 and the cumulative count N1 input in step S31, using the table shown in fig. 12 (step S32).
The determination section 22 determines the exposure time N2 and the number of accumulations N2 in the measurement using the two-dimensional imaging sensor 8 using the table shown in fig. 13 and the measurement time calculated in step S32 (i.e., the measurement time of the measurement using the spectroscopic sensor 9) (step S33).
Fig. 13 is a diagram showing an example of a table for determining the exposure time N2 and the cumulative number T2 in the measurement using the two-dimensional imaging sensor 8. This table is stored in the storage unit 23 (fig. 2) in advance.
A plurality of measurement times for measurement using the spectroscopic sensor 9 are set in the table of fig. 13 (for example, a measurement time is set every 1 second). In the table, the exposure time and the accumulated number in the measurement using the two-dimensional imaging sensor 8 assigned to each of these measurement times are set. They have the following relationship. The measurement time of the measurement using the spectroscopic sensor 9 is set to m. The exposure time in the measurement using the two-dimensional imaging sensor 8 allocated to the measurement time m is set to t, and the number of accumulations is set to n. The measurement time of the measurement using the two-dimensional imaging sensor 8 under this condition does not exceed the measurement time m, and is a value closest to the measurement time m among values that can be set as the measurement time of the measurement using the two-dimensional imaging sensor 8. Thereby, the measurement time (2 nd measurement time) of the measurement using the two-dimensional imaging sensor 8 can be increased as much as possible within a range not exceeding the measurement time (1 st measurement time) of the measurement using the spectroscopic sensor 9. Therefore, at least one of the exposure time and the number of times of integration in the measurement using the two-dimensional imaging sensor 8 can be increased, so that the accuracy of the measurement using the two-dimensional imaging sensor 8 can be improved.
The determination section 22 determines the combination of the exposure time and the number of accumulations assigned to the measurement time calculated in step S32 (i.e., the measurement time of the measurement using the spectroscopic sensor 9) as the exposure time T2 (the 2 nd exposure time) and the number of accumulations N2 (the 2 nd accumulation number) in the measurement using the two-dimensional imaging sensor 8 from the table shown in fig. 13 (step S33).
The control processing unit 15 sets the exposure time T1 and the cumulative count N1 input in step S31 as the exposure time and the cumulative count during measurement using the spectroscopic sensor 9, and sets the exposure time T2 and the cumulative count N2 determined in step S33 as the exposure time and the cumulative count during measurement using the two-dimensional imaging sensor 8 (step S34). The optical characteristic measurement apparatus 1 measures the optical characteristic of the screen of the flat panel display 4 under the setting of step S34.
According to modification 2, since the determination unit 22 determines the exposure time T2 and the cumulative count N2 in the measurement using the two-dimensional imaging sensor 8, the trouble of the measurer in determining and inputting the exposure time and the cumulative count can be eliminated in the measurement using the two-dimensional imaging sensor 8.
In the present embodiment, modification 1, and modification 2, the optical characteristic measurement device 1 has been described by taking a two-dimensional color measuring instrument as an example, but the present invention is not limited to this, and may be a two-dimensional luminance meter, for example. In the case of a two-dimensional luminance meter, the color filter 7 (fig. 1) is not provided, and a luminance sensor is provided instead of the spectroscopic sensor 9 (fig. 1).
(summary of the embodiment)
The 1 st aspect of the embodiment provides an optical characteristic measurement device including: a 1 st optical sensor that takes a two-dimensional region in a measurement object as a measurement range; a 2 nd optical sensor having a point region included in the two-dimensional region and narrower than the two-dimensional region as a measurement range; an input section that inputs a 1 st exposure time and a 1 st cumulative count with respect to measurement using one of the 1 st optical sensor and the 2 nd optical sensor; a calculation section that calculates a 1 st measurement time using the 1 st exposure time and the 1 st cumulative number input to the input section, the 1 st measurement time being a measurement time of measurement using the one optical sensor; and a determination unit configured to determine at least one of a 2 nd exposure time and a 2 nd cumulative count in a measurement using the other of the 1 st optical sensor and the 2 nd optical sensor, in such a manner as to reduce or eliminate a difference between the 1 st measurement time and the 2 nd measurement time, the 2 nd measurement time being a measurement time of the measurement using the other optical sensor.
If the specifying unit specifies at least one of the 2 nd exposure time and the 2 nd cumulative count so that the value becomes a value close to the 1 st measurement time among the values that can be set as the 2 nd measurement time, the difference between the 1 st measurement time and the 2 nd measurement time can be reduced. If the determination section determines at least one of the 2 nd exposure time and the 2 nd cumulative count in such a manner that the 2 nd measurement time is the same as the 1 st measurement time, the difference between the 1 st measurement time and the 2 nd measurement time can be eliminated.
In this way, according to the optical characteristic measurement device of the 1 st aspect of the embodiment, it is possible to reduce the difference between the 1 st measurement time, which is the time required for measurement using one optical sensor, and the 2 nd measurement time, which is the time required for measurement using another optical sensor, or to eliminate the difference. Thus, it is possible to prevent a long standby time from being generated in any optical sensor when optical characteristics are measured using two optical sensors.
The following three options are available for the determination unit to determine at least one of the 2 nd exposure time and the 2 nd cumulative count. The specifying unit specifies the 2 nd cumulative count for the 1 st exposure time, the 1 st cumulative count, and the 2 nd exposure time input to the input unit by the measurer, for example. The determination unit determines the 2 nd exposure time at the 1 st exposure time, the 1 st cumulative count, and the 2 nd cumulative count input to the input unit by the measurer. The specifying unit specifies both the 2 nd exposure time and the 2 nd cumulative count under the 1 st exposure time and the 1 st cumulative count input to the input unit by the measurer.
In the above configuration, the specifying unit may specify at least one of the 2 nd exposure time and the 2 nd cumulative count so as to avoid the 2 nd measurement time from exceeding the 1 st measurement time.
The measurement time of the optical characteristic measurement device is limited to the longer of the 1 st measurement time and the 2 nd measurement time. According to this configuration, the 2 nd measurement time can be made not to exceed the 1 st measurement time with respect to the 1 st measurement time determined using the 1 st exposure time and the 1 st cumulative count input by the measurer, so that the measurement time of the optical characteristic measurement apparatus can be suppressed from becoming longer.
In the above configuration, the specifying unit may specify at least one of the 2 nd exposure time and the 2 nd cumulative count so that the value closest to the 1 st measurement time is a value that can be set as the 2 nd measurement time.
According to this configuration, the 2 nd measurement time can be increased as much as possible within a range not exceeding the 1 st measurement time. This makes it possible to increase at least one of the 2 nd exposure time and the 2 nd cumulative count, and therefore, the accuracy of measurement using the other optical sensor can be improved.
In the above configuration, the measurement target is a screen of a display operating at a predetermined refresh cycle, the input unit receives an input of the 1 st exposure time which is an integer multiple of the refresh cycle, and the specifying unit specifies the 2 nd exposure time from variable exposure times which indicate values obtained by multiplying the refresh cycle.
In the measurement of a screen of a display that operates at a predetermined refresh period (for example, measurement of chromaticity distribution), when the exposure time is not an integral multiple of the refresh period, the exposure time does not match the refresh period, so the measurement accuracy is lowered. According to this configuration, since the 1 st exposure time and the 2 nd exposure time can be set to be integral multiples of the refresh cycle, a decrease in measurement accuracy can be prevented.
In the above configuration, the storage unit stores in advance a saturation exposure time in which the output from the other optical sensor is saturated, and the determination unit determines a value smaller than the saturation exposure time as the 2 nd exposure time.
When the 2 nd exposure time exceeds the saturation exposure time, measurement using another optical sensor cannot be accurately performed. With this configuration, the 2 nd exposure time can be prevented from exceeding the saturation exposure time.
In the above configuration, the determination unit may determine a value closest to the saturation exposure time as the 2 nd exposure time.
According to this configuration, since the 2 nd exposure time can be increased as much as possible, the accuracy of measurement using the 2 nd optical sensor can be improved.
In the above configuration, the 1 st optical sensor includes an RGB color filter and a two-dimensional imaging sensor that receives light via the RGB color filter, and the 2 nd optical sensor includes a spectroscopic sensor.
This structure is an example of a combination of the 1 st optical sensor and the 2 nd optical sensor.
In the above configuration, the color correction unit may correct color data of each pixel of the two-dimensional region including the dot region measured by the two-dimensional imaging sensor, using color data of the dot region measured by the spectroscopic sensor.
The structure is a scheme that the optical characteristic measuring device is a two-dimensional color measuring instrument.
In the above configuration, the optical measuring apparatus further includes a light splitting unit that splits the light from the measuring object into two, wherein the 1 st optical sensor is disposed on an optical path of one of the two split lights, and the 2 nd optical sensor is disposed on an optical path of the other of the two split lights.
According to this configuration, the light from the measurement object is sent to the 1 st optical sensor and the 2 nd optical sensor by the light splitting unit.
In accordance with the second aspect of the present invention, there is provided a method for setting an optical characteristic measuring apparatus, comprising: a 1 st optical sensor that takes a two-dimensional region in a measurement object as a measurement range; and a 2 nd optical sensor having a point region included in the two-dimensional region and narrower than the two-dimensional region as a measurement range, wherein the method of setting the optical characteristic measurement device includes: an input step of inputting a 1 st exposure time and a 1 st cumulative number with respect to measurement using one of the 1 st optical sensor and the 2 nd optical sensor; a calculation step of calculating a 1 st measurement time that is a measurement time of the measurement using the one optical sensor, using the 1 st exposure time and the 1 st cumulative number input in the input step; and a determination step of determining at least one of a 2 nd exposure time and a 2 nd cumulative count in a measurement using the other of the 1 st optical sensor and the 2 nd optical sensor, in such a manner as to reduce a difference between the 1 st measurement time and the 2 nd measurement time or eliminate the difference, the 2 nd measurement time being a measurement time of the measurement using the other optical sensor.
The method of setting the optical characteristic measurement device according to embodiment 2 can prevent a long standby time from occurring in any of the optical sensors when measuring optical characteristics using two optical sensors, for the same reason as the optical characteristic measurement device according to embodiment 1.
This application is based on Japanese patent application laid-open No. 2015-123680 filed on 19.6.2015, and the contents thereof are included in this application.
In order to express the present invention, the present invention has been described in the embodiments appropriately and sufficiently with reference to the drawings, but it should be understood that the embodiments can be easily changed and/or modified by those skilled in the art. Therefore, unless a modification or improvement made by a person skilled in the art is a level departing from the scope of claims of the present invention, the modification or improvement is to be construed as being included in the scope of claims.
Industrial applicability of the invention
According to the present invention, an optical characteristic measurement device and a method for setting an optical characteristic measurement device can be provided.
Claims (10)
1. An optical characteristic measurement device is provided with:
a 1 st optical sensor that takes a two-dimensional region in a measurement object as a measurement range;
a 2 nd optical sensor having a point region included in the two-dimensional region and narrower than the two-dimensional region as a measurement range;
an input section to which a 1 st exposure time and a 1 st cumulative count are input with respect to a measurement using one of the 1 st optical sensor and the 2 nd optical sensor;
a calculation section that calculates a 1 st measurement time using the 1 st exposure time and the 1 st cumulative number input to the input section, the 1 st measurement time being a measurement time of a measurement using the one optical sensor; and
and a determination unit configured to determine at least one of a 2 nd exposure time and a 2 nd cumulative count in a measurement using the other of the 1 st optical sensor and the 2 nd optical sensor so as to reduce or eliminate a difference between the 1 st measurement time and the 2 nd measurement time, the 2 nd measurement time being a measurement time of the measurement using the other optical sensor.
2. The optical property measurement device of claim 1,
the determination unit determines at least one of the 2 nd exposure time and the 2 nd cumulative count so as to avoid the 2 nd measurement time from exceeding the 1 st measurement time.
3. The optical property measurement device of claim 2,
the specifying unit specifies at least one of the 2 nd exposure time and the 2 nd cumulative count so that the value closest to the 1 st measurement time is a value that can be set as the 2 nd measurement time.
4. The optical property measurement device according to any one of claims 1 to 3,
the measurement object is a picture of a display operating according to a predetermined refresh period,
the input unit receives an input of the 1 st exposure time which is an integral multiple of the refresh period,
the specifying unit specifies the 2 nd exposure time from variable exposure times that represent values obtained by multiplying the refresh cycle.
5. The optical property measurement device of claim 4,
the optical characteristic measuring apparatus further includes a storage unit that stores in advance a saturation exposure time in which an output from the other optical sensor is saturated,
the determination section determines a value smaller than the saturation exposure time as the 2 nd exposure time.
6. The optical property measurement device of claim 5,
the determination section determines a value closest to the saturated exposure time as the 2 nd exposure time.
7. The optical property measurement device according to any one of claims 1 to 3,
the 1 st optical sensor includes RGB color filters and a two-dimensional imaging sensor receiving light through the RGB color filters,
the 2 nd optical sensor includes a spectroscopic sensor.
8. The optical property measurement device of claim 7,
the optical characteristic measurement device further includes a color correction unit that corrects color data of each pixel of the two-dimensional region including the dot region measured by the two-dimensional imaging sensor, using color data of the dot region measured by the spectroscopic sensor.
9. The optical property measurement device according to any one of claims 1 to 3,
the optical characteristic measuring apparatus further includes a light splitting unit that splits the light from the measurement object into two parts,
the 1 st optical sensor is arranged on the optical path of the one path of light obtained by the two divisions,
the 2 nd optical sensor is disposed on an optical path of the other light obtained by the two divisions.
10. A method for setting an optical characteristic measurement device, the optical characteristic measurement device comprising: a 1 st optical sensor that takes a two-dimensional region in a measurement object as a measurement range; and a 2 nd optical sensor having a point region included in the two-dimensional region and narrower than the two-dimensional region as a measurement range, wherein the method of setting the optical characteristic measurement device includes:
an input step of inputting a 1 st exposure time and a 1 st cumulative number with respect to measurement using one of the 1 st optical sensor and the 2 nd optical sensor;
a calculation step of calculating a 1 st measurement time using the 1 st exposure time and the 1 st cumulative number input in the input step, the 1 st measurement time being a measurement time of measurement using the one optical sensor; and
a determination step of determining at least one of a 2 nd exposure time and a 2 nd cumulative count in a measurement using the other of the 1 st optical sensor and the 2 nd optical sensor, in such a manner as to reduce or eliminate a difference between the 1 st measurement time and the 2 nd measurement time, the 2 nd measurement time being a measurement time of the measurement using the other optical sensor.
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| JP2015-123680 | 2015-06-19 | ||
| PCT/JP2016/065113 WO2016203902A1 (en) | 2015-06-19 | 2016-05-23 | Optical characteristic measuring apparatus and setting method for optical characteristic measuring apparatus |
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| JPH06323910A (en) * | 1993-05-13 | 1994-11-25 | Minolta Camera Co Ltd | Light-source-color colorimeter |
| JP4121724B2 (en) * | 2001-09-04 | 2008-07-23 | コニカミノルタセンシング株式会社 | Reflection characteristic measuring device |
| CN101118222B (en) * | 2006-08-03 | 2012-07-04 | 海德堡印刷机械股份公司 | Color measuring apparatus having differently operating measuring devices |
| JP2008216203A (en) * | 2007-03-07 | 2008-09-18 | Canon It Solutions Inc | Information processor, method of predicting measurement time, program, and recording medium |
| JP2008281536A (en) * | 2007-05-14 | 2008-11-20 | Sharp Corp | Image processing apparatus, image processing program, and imaging device |
| JP2015099074A (en) * | 2013-11-19 | 2015-05-28 | セイコーエプソン株式会社 | Spectrometric measurement apparatus and spectrometric measurement method |
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| JPS6343486A (en) * | 1986-08-11 | 1988-02-24 | Canon Inc | Image pickup device |
| JP2003075271A (en) * | 2001-09-04 | 2003-03-12 | Mitsumi Electric Co Ltd | Pressure-sensitive sensor |
| JP2010271246A (en) * | 2009-05-22 | 2010-12-02 | Sony Corp | Method and device for color luminance measurement |
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