KR20190048918A - Apparatus and Method for measuring Chromatic-luminance and Spectral-radiance simultaneously - Google Patents

Abstract

According to the present invention, a device to simultaneously measure spectral radiation and color brightness includes a measurement module including a colorimeter measuring color brightness, a spectrometer measuring color brightness, and a light divider dividing a beam to make measurement target light reach the colorimeter and the spectrometer at the same time. Therefore, the device is capable of correcting a device faster than an existing brightness photometer.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an apparatus and a method for simultaneously measuring spectral radiation and chromatic luminance,

The present invention relates to an apparatus and a method for simultaneously measuring spectral radiation and chromatic luminance.

The color matching function based on human color recognition is a mathematical function corresponding to red, green, and blue, and is a function of the spectral power distribution function for the color of the object to be inspected Can be combined to calculate the chromatic-luminance. In the color analysis inspection system, the color matching function corresponds to three kinds of filters. These filters are put in front of the optical sensor (CCD camera) so that the three colors can be recognized independently, (Colorimetry of displays, Bentham Instruments Ltd, January 1997, p. 45). A color intensity meter for performing such a color analysis inspection system has been described in KR 10-2015-0137196.

The color luminosity system includes a separate reference system for calibrating the derived color coordinates and color temperature. The color luminance meter including such a reference system has a merit that calibration accuracy is low but calibration can be performed quickly. The spectral radiance spectrometer has a disadvantage in that the measurement speed is low in that spectral information must be derived, instead of being highly accurate in calibration, as compared with the chromatic luminometer.

The present invention provides an apparatus and a method for simultaneously measuring spectral radiation and chromatic luminance.

An apparatus for simultaneously measuring spectral radiance and color luminance according to an embodiment includes a colorimeter for measuring chromaticity luminance, a spectrometer for measuring spectral radiation, a measurement including a light divider for branching a beam so that the measurement target light reaches the chromatic meter and the spectrometer at the same time Module.

A collimating lens that transmits the light to be measured parallel to the optical splitter, and a collimating module including a shutter that can block the light to be measured.

An objective lens, and a lens module including a diaphragm provided on the rear surface of the objective lens.

The lens module may further include an imaging device for confirming an alignment state of the objective lens and the diaphragm.

The measurement module and the collimating module may include a detachable coupling portion.

The lens module and the collimating module may include a detachable coupling portion.

And a communication unit for transmitting the measured information from the measurement module.

According to an embodiment, there is provided a method of assembling an apparatus for simultaneously measuring spectral radiation and chromatic luminance,

Assembling the lens module,

Aligning the lens module,

Assembling the collimating module;

Assembling the collimating module and the lens module;

Aligning the collimating module;

Assembling the measurement module; And

And combining the measuring module with the collimating module.

Wherein the assembling of the lens module comprises assembling an objective lens and a diaphragm,

The step of aligning the lens module may be a step of aligning the objective lens and the diaphragm using an imaging device.

The step of assembling the collimating module may be a step of assembling the collimating lens and the shutter.

The step of assembling the measurement module may be a step of assembling the optical divider, the colorimeter, and the spectrometer.

And combining the communication module after the step of combining the measurement module.

In the method of simultaneously measuring spectral radiation and chromatic luminance according to an exemplary embodiment,

Measuring in a light state using a colorimeter and a spectrometer;

Measuring in a dark state using a colorimeter and a spectrometer;

Deriving a K-factor; And

And correcting the measured value of the colorimeter using a K-factor.

The step of deriving the K-

Deriving a tricolor stimulus value from the spectrometer;

Deriving a tricolor stimulus value from the colorimeter; And

And deriving a K-factor for correcting the tricolor stimulation value of the colorimeter based on the tricolor stimulation value of the spectrometer.

The step of deriving the tricolor stimulus value from the spectrometer may be a step of subtracting the measured value of the darkness from the measured value of the light state to derive the tricolor stimulus value.

The step of deriving the tricolor stimulus value from the colorimeter may be a step of subtracting the measured cancer state value from the measured light state value to derive the tricolor stimulus value.

The present invention provides an apparatus and a method for simultaneously measuring spectral radiation and chromatic luminance, so that it is possible to simultaneously measure spectral radiation and chromatic luminance even in a simple configuration.

The apparatus and method for simultaneously measuring spectral radiation and color luminance according to the present invention can calibrate a measurement apparatus without a separate reference system. The apparatus and method for simultaneously measuring spectral radiation and chromaticity luminance according to the present invention can calibrate the apparatus with high accuracy and can calibrate the apparatus at a higher speed than the conventional spectral radiance meter.

The apparatus and method for simultaneously measuring spectral radiation and color luminance according to the present invention can calibrate a device by deriving a K-factor. The derived K-factor can be continuously used under the same measurement conditions, which can shorten the time required for calibration.

The apparatus for simultaneously measuring spectral radiation and chromaticity luminance according to the present invention is constructed as a module and is easy to assemble and can easily align and change an optical system.

1 is a cross-sectional view showing an apparatus for simultaneously measuring spectral radiation and color luminance according to the present invention.
2 is a perspective view showing an apparatus for simultaneously measuring spectral radiation and color luminance according to FIG.
FIG. 3 is a view schematically showing each module of the apparatus for simultaneously measuring spectral radiation and color luminance according to the present invention.
4 is a flowchart showing a method of assembling and aligning an apparatus for simultaneously measuring spectral radiation and chromaticity luminance according to the present invention.
5 is a flowchart showing a method of simultaneously measuring spectral radiation and chromaticity luminance according to the present invention.
6 is a flowchart showing a K-factor derivation calculation method according to the present invention.

Brief Description of the Drawings The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described in conjunction with the accompanying drawings. It is to be understood, however, that the invention is not limited to the embodiments shown herein but may be embodied in many different forms and should not be construed as being limited to the preferred embodiments of the present invention. do. BRIEF DESCRIPTION OF THE DRAWINGS The above and other aspects of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. .

1 is a cross-sectional view showing an apparatus for simultaneously measuring spectral radiation and color luminance according to the present invention. 2 is a perspective view showing an apparatus 10 for simultaneously measuring spectral radiation and color luminance according to FIG.

1 and 2, an apparatus 10 for measuring spectral radiation and chromaticity luminance simultaneously includes an objective lens 1, an image pickup device 2, an iris 3, a collimating lens 4, a shutter 5, A light splitter 6, a colorimeter 7, a spectrometer 8, and a communication unit 9.

The apparatus 10 for measuring spectral radiance and color luminance simultaneously according to the present embodiment can measure the chromatic brightness of an object with a colorimeter 7 and simultaneously measure spectral radiation with the spectrometer 8. [

The objective lens 1 is an optical element provided on the most object side in the apparatus 10 for simultaneously measuring spectral radiance and color luminance. The objective lens 1 can function to condense the light transmitted from the object. The objective lens 1 may include a lens system composed of a single lens or composed of a plurality of lenses, and is not limited to a specific embodiment.

The imaging apparatus 2 can confirm whether or not the alignment of the objective lens 1 and the diaphragm 3 is correct. The image capturing apparatus 2 may include any optical image capturing apparatus including a CMOS, a CCD, and the like, and is not limited to a specific embodiment. The image captured by the image capturing apparatus 2 may be transmitted to an external control unit (not shown) through the communication unit 9, but the present invention is not limited thereto.

The diaphragm 3 functions to transmit the light condensed from the objective lens 1 to the collimating lens 4. The diaphragm 3 can transmit a part of the light condensed from the objective lens 1 to the image pickup device 2 to enable the diaphragm 3 and the objective lens 1 to be aligned. The diaphragm may be provided at an angle of 45 degrees with respect to the plane of the light transmitted from the objective lens 1, but is not limited thereto. An optical element having a light splitter function may be provided at the center of the diaphragm. An optical element having a light splitter function can transmit a part of light to the collimating lens 4 and transmit a part of light to the image pickup device 2. [ The intensity ratio of the light transmitted to the collimating lens 4 and the light transmitted to the image pickup device 2 can be changed according to the properties of the optical element.

The collimating lens 4 can convert the light passing through the diaphragm 3 into parallel light and transmit it to the light splitter 6. The collimating lens 4 may include any optical element that converts light into parallel light, and is not limited to a specific embodiment.

The shutter 5 is provided on the rear surface of the collimating lens 4 and may have a function of blocking or passing parallel light passing through the collimating lens 4.

The light splitter 6 can transmit a part of the parallel light that has passed through the collimating lens 4 to the chromaticity meter 7 and a part thereof to the spectrometer 8. The light splitter 6 may include, for example, a beam splitter or an optical fiber capable of Y-shaped branching. The light splitter 6 may include an optical element that can divide the light and transmit it in the other direction, and is not limited to the example described above. The colorimeter 7 receives the light and measures the chromatic brightness, and the spectrometer 8 can measure the spectral radiation by receiving the light. The light splitter 6 can be arranged such that the branched light is simultaneously received by the colorimeter 7 and the spectrometer 8.

The colorimeter 7 and the spectrometer 8 can transmit the measured chromatic brightness and spectral radiance information to a control unit (not shown) located inside or outside. For example, the colorimeter 7 and the spectrometer 8 can transmit the chromatic brightness and the spectral radiance information through the communication unit 9.

The communication unit 9 may be any component that transmits information measured by the apparatus 10 for measuring spectral radiance and color luminance according to the present embodiment. For example, the communication unit 9 may be a USB hub, but is not limited thereto.

3 is a schematic view of each module of the apparatus 10 for measuring spectral radiance and color luminance according to the present invention. Referring to FIG. 3, the apparatus 10 for simultaneously measuring spectral radiance and color luminance may include a lens module 11, a collimating module 20, and a measurement module 30. The apparatus for measuring spectral radiance and chromaticity luminance simultaneously 10 according to the present invention includes a module structure classified by function, so that it can be easily separated and assembled, can be easily aligned, and can be easily replaced when required.

The objective lens 1, diaphragm 3, and image pickup device 2 can constitute the lens module 11. The objective lens 1, the diaphragm 3 and the image pickup device 2 may have a coupling structure for constituting the lens module 11 and can easily be coupled to each other through the coupling structure. The objective lens 1, the diaphragm 3 and the image pickup device 2 constitute the lens module 11 so that the optical alignment between the objective lens 1 and the diaphragm 3 is easy and the change of the diaphragm 3 It can be easy. For example, when the diameter of the optical element having the optical splitter function of the diaphragm 3 is changed as required, the modification can be facilitated through such a module configuration.

The collimating lens 4 and the shutter 5 may constitute the collimating module 20. The collimating lens 4 and the shutter 5 may have a coupling structure for constituting the collimating module 20 and can be easily coupled to each other through the coupling structure. The collimating lens 4 and the shutter 5 constitute the collimating module 20 so that the collimating lens 4 and the shutter 5 can be easily changed and other modules (30) can be freely combined and separated.

The light splitter 6, the colorimeter 7 and the spectrometer 8 can constitute a measurement module 30. [ The light divider 6, the colorimeter 7, and the spectrometer 8 may have a coupling structure for constituting the measurement module 30 and can be easily coupled to each other through the coupler. The arrangement for simultaneous measurement of the optical splitter 6 can be facilitated by the optical splitter 6, the colorimeter 7 and the spectrometer 8 constituting the measurement module 30. [

4 is a flowchart showing a method of assembling and aligning an apparatus 10 for simultaneously measuring spectral radiation and color luminance according to the present invention.

In one step, the lens module 11 can be assembled (S101). For example, the objective lens 1 and the diaphragm 3 can be assembled first, and the diaphragm 3 and the imaging device 2 can be assembled.

In the next step, the lens module 11 can be aligned (S102). For example, whether or not the objective lens 1 and the diaphragm 3 are aligned can be confirmed by the imaging device 2 and aligned. For example, the objective lens 1 and the diaphragm 3 can be aligned by placing the diaphragm hole of the diaphragm 3 in the center of the image identified by the imaging device 2. [

In the next step, the collimating module 20 may be assembled (S103). For example, the collimating lens 4 can be assembled to the fixed portion of the shutter 5.

In the next step, the collimating module 20 may be coupled with the lens module 11 (S104). The lens module 11 and the collimating module 20 may include a coupling portion for module coupling.

In the next step, the collimating module 20 may be aligned (S105). It is possible to examine whether or not the collimating module 20 is aligned by inspecting the rate of change of the beam spot size per distance that the parallel light formation of the collimating module 20 is performed correctly.

In the next step, the measurement module 30 can be assembled (S106). The measurement module 30 may be assembled by assembling the chromaticity meter 7 and the spectrometer 8 to the light splitter 6. The light splitter 6 may be arranged to simultaneously irradiate the colorimeter 7 and the spectrometer 8 with a beam.

In the next step, the measuring module 30 may be combined with the collimating module 20 (S107). The jam module 30 and the collimating module 20 may include a coupling for module coupling.

In the next step, the measurement module 30 can be coupled with the communication unit 9 (S108).

5 is a flowchart showing a method of simultaneously measuring spectral radiation and chromaticity luminance according to the present invention.

In one step, the colorimeter and the spectrometer can measure the optical state (S201). The light state may mean a normal state in which a subject to be measured is photographed. For example, a chromatic meter and a spectrometer receive light from a display to be measured, and chromaticity luminance and spectral radiation can be measured.

The next step is to measure the darkness of the colorimeter and the spectrometer (S202). The dark state means a state in which the shutter is closed so that light does not enter the colorimeter and the spectrometer from an external light source. This is because chromaticity and spectral radiation due to the noise signal can be measured in the colorimeter and the spectrometer even in such a dark state. Therefore, in order to obtain the chromaticity luminance and spectral radiance information measured from the object to be measured, it is necessary to subtract the dark state measurement value from the light state measurement value. Accordingly, pure chromaticity luminance and spectral radiance information of the measurement object can be derived through the optical state measurement (S201) and the dark state measurement (S202).

In the next step, it is possible to check whether there is a derived K-factor (S203). The K-factor can refer to a reference parameter for calibrating the measured value of the colorimeter. The apparatus 10 for measuring spectral radiance and chromaticity luminance simultaneously includes the spectrometer 8 and the colorimeter 7 so that the colorimeter 7 is not corrected using a reference system, Can be corrected. Such a K-factor method is more accurate than the reference system and may be faster than the method using only the spectrometer.

If there is no K-factor, a K-factor derivation operation (S204) can be performed. The K-factor derivation operation (S204) will be described later with reference to FIG.

In the next step, if there is a derived K-factor, the colorimeter measurement value correction calculation (S205) may be performed using a K-factor. For example, a calibrated color coordinate value can be obtained by multiplying a color coordinate value measured by a colorimeter by a K-factor value. The specific calibration method may vary depending on how the K-factor value is defined and is not limited to the example described above.

In the next step, the chromatic brightness and spectral radiance valid data can be derived based on the calibrated colorimeter measurement value and the spectrometer measurement value (S206). For example, an LV value, a color coordinate value, a color temperature value, and the like can be derived.

6 is a flowchart showing a K-factor derivation calculation method according to the present invention.

Referring to FIG. 6, the trichromatic stimulus value of the light of the measurement object can be obtained by subtracting the dark state measurement value from the light state measurement value of the colorimeter (S204-1).

In the next step, a pure measurement value of the measurement object can be obtained by subtracting the dark state measurement value from the measurement value of the spectrometer (S204-2).

In the next step, the tricolor stimulus value of the light can be derived based on the pure measurement value of the spectrometer (S204-3).

In the next step, the K-factor can be derived by comparing the tricolor stimulus value of the light of the spectrometer with the tricolor stimulus value of the colorimeter (S204-4). For example, since the measurement accuracy of the spectrometer can be higher than that of the colorimeter, the tricolor stimulus value of the colorimeter can be calibrated based on the tricolor stimulus value of the spectrometer. This correction factor can be defined as a K-factor. For example, the K-factor can be defined as the tricolor reference value of the spectrometer / the tricolor reference value of the colorimeter. The K-factor thus defined can be used to derive the calibrated tricolor reference value by multiplying it with the measured value at a later colorimeter. The K-factor can be determined differently depending on the functional relationship relating the tricolor stimulus value of the spectrometer to the tricolor stimulus value of the colorimeter, and is not limited to the example described above.

The derived K-factor is stored in a memory (not shown) and can be continuously used in shooting under the same measurement conditions.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: Device for simultaneously measuring spectral radiation and color luminance
1: Objective lens
2: Imaging device
3: Aperture
4: Collimating lens
5: Shutter
6:
7: Colorimeter
8: Spectrometer
9:
11: Lens module
20: Collimating module
30: Measurement module

Claims (16)

And a measurement module including a colorimeter for measuring chromatic brightness, a spectrometer for measuring spectral radiation, and a light splitter for dividing the beam so that the light to be measured reaches the chromatic meter and the spectrometer at the same time. The method according to claim 1,
A collimating lens for transmitting the light to be measured in parallel to the optical splitter, and a collimating module including a shutter for blocking the light to be measured. 3. The method of claim 2,
And a lens module including an objective lens and a diaphragm provided on the rear surface of the objective lens. The method of claim 3,
Wherein the lens module further includes an imaging device for confirming an alignment state of the objective lens and the diaphragm. 3. The method of claim 2,
Wherein the measuring module and the collimating module include a coupling part detachable from each other. The method of claim 3,
Wherein the lens module and the collimating module include a coupling part detachable from each other. The method according to claim 1,
And a communication unit for transmitting the measured information from the measurement module. A method of assembling an apparatus for simultaneous spectral radiation and color luminance measurement,
Assembling the lens module,
Aligning the lens module,
Assembling the collimating module;
Assembling the collimating module and the lens module;
Aligning the collimating module;
Assembling the measurement module; And
And combining the collimating module and the measurement module. 9. The method of claim 8,
Wherein the assembling of the lens module comprises assembling an objective lens and a diaphragm,
Wherein the step of aligning the lens module comprises aligning the objective lens and the diaphragm using an imaging device. 9. The method of claim 8,
Wherein the step of assembling the collimating module is a step of assembling the collimating lens and the shutter. 9. The method of claim 8,
And assembling the measurement module is a step of assembling a light divider, a colorimeter, and a spectrometer, wherein the spectroscopic radiation and the chromaticity luminance are simultaneously measured. 9. The method of claim 8,
And combining the communication module after the step of assembling the measurement module. A method for simultaneously measuring spectral radiation and chromatic luminance,
Measuring in a light state using a colorimeter and a spectrometer;
Measuring in a dark state using a colorimeter and a spectrometer;
Deriving a K-factor; And
And correcting the measured value of the colorimeter using a K-factor. 14. The method of claim 13,
The step of deriving the K-
Deriving a tricolor stimulus value from the spectrometer;
Deriving a tricolor stimulus value from the colorimeter; And
And deriving a K-factor for correcting the tricolor stimulus value of the colorimeter based on the tricolor stimulus value of the spectrometer. 15. The method of claim 14,
Wherein deriving the tricolor stimulus value from the spectrometer comprises deriving a tricolor stimulus value by subtracting the dark state measurement value from the light state measurement value. 15. The method of claim 14,
Wherein deriving the tricolor stimulus value from the colorimeter is a step of deriving a tricolor stimulus value by subtracting the dark state measurement value from the light state measurement value.

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