WO2015133476A1

WO2015133476A1 - Spectroradiometer

Info

Publication number: WO2015133476A1
Application number: PCT/JP2015/056218
Authority: WO
Inventors: 直樹野呂; 洋平高良; 史識安藤; 雄大藤森
Original assignee: エバ・ジャパン株式会社; 直樹野呂
Priority date: 2014-03-03
Filing date: 2015-03-03
Publication date: 2015-09-11
Also published as: JP6068375B2; JP2015166682A

Abstract

[Problem] To provide a spectroradiometer with which it is possible within a brief period of time to acquire spectral information for each pixel of a wide range, and to interconvert between color displays in any color system. [Solution] This device has: a two-dimensional image pickup detector which, through pickup of an image, is impinged upon by a beam of light traveling from a subject and diffused by optical elements, and the pick-up detector acquiring an electrical signal based on the impinging light; a moving means for integrally moving an arrangement in a subsequent stage from the objective lens in a prescribed direction, and moving the image pickup location in the prescribed direction; a means for synchronized control of image pickup and movement of the moving means; a means for creating, on the basis of the signal, first data that includes one-dimensional spatial information pertaining to the image pickup location and wavelength information, and creating, from the first data at each image pickup location, second data that includes two-dimensional spatial information and one-dimensional wavelength information; a means for creating a spectral image of each wavelength from the second data; a means for acquiring the spectral radiance in each pixel of spectral images; and a means for creating an image according to a prescribed color system from a spectral image, and performing a color computation process on this image to create an image of a prescribed display method.

Description

Spectral radiance meter

The present invention relates to a spectral radiance meter, and more particularly to a spectral radiance meter that measures a region including an object to be measured and acquires color information of the region.

In conventional color analysis display, color coordinate notation (such as CIEXYZ) based on RGB obtained by multiplying spectral information obtained by a spectral radiance meter by experimentally obtained human visibility is widely used. However, these color coordinate notations are based on data obtained by statistically processing the influence of psychological states and individual differences, and cannot cope with individual diversity.

Specifically, the color matching function that is the basis of all color spaces is a characteristic of a virtual observer called a standard observer based on statistical processing of psychological experiment results. There are individual differences due to the lens yellowing due to, and intra-individual variation due to the effect of macular pigment on the retina. When such variations in the color matching function cannot be ignored, when two types of stimuli are presented, even if the same color is perceived by the standard observer, a different color appears to another person (observer metamerism) ) Occurs.

Here, in order not to generate such observer metamerism, for example, a technique using spectral image information is known.

Such a technique is disclosed, for example, in Non-Patent Document 1, and by reproducing the spectral distribution of the reflected light from the real object using spectral image information and a corresponding multi-primary color display (spectral color reproduction), The observer can recognize the real object and the image on the display as the same color.

Such technology using spectral image information is expected to be applied to fields that require high-precision color matching between different media, such as color matching for telemedicine, artwork archives, clothing / interior / prints, etc. The

In addition, the conventional color analysis display uses different color analysis display methods depending on the industry and country, so it is difficult to compare each other, and the compatibility between each color analysis display method is difficult, and it is difficult to handle. It had been.

Further, since the conventional spectral radiance meter can only measure an average value of one point or a fixed space region (for example, an angle of view of 10 ° or less), for example, an object to be measured (hereinafter referred to as an object to be measured) In order to obtain spectral information in the two-dimensional space of the surface of the object, the spectral radiance meter or the object must be scanned to measure enormous points on the object surface. In other words, it takes a lot of time to obtain color information on the surface of the object, and it has been pointed out as a problem that it is substantially impossible.
Furthermore, when acquiring spectral information of a certain spatial region, the spectral information within the captured angle of view is averaged, so in the spectral information of the object surface created by acquiring such spectral information, the spatial information It has been pointed out that a difference in color information for each detail (one pixel) cannot be grasped, and the object surface cannot be accurately evaluated.

The present invention has been made in view of the various problems of the conventional techniques as described above, and its object is to perform color display and mutual conversion by an arbitrary color system without loss of information. It is intended to provide a spectral radiance meter that can be used.

In addition, an object of the present invention is to easily and quickly acquire spectroscopic information for each pixel in a two-dimensional space that is wider than a region measurable by a conventional spectral radiance meter. The present invention intends to provide a spectral radiance meter capable of satisfying the requirements.

In order to achieve the above object, the present invention provides a two-dimensional imaging detector that captures an entire predetermined measurement region including an object while moving the imaging position by moving the configuration subsequent to the objective lens. Two-dimensional spectral data having one-dimensional spatial information and one-dimensional wavelength information is acquired by (area sensor).

The one-dimensional wavelength information includes several tens of wavelengths in the wavelength range from ultraviolet to infrared (eg, 200 nm to 13 μm) including visible light visible to humans with a wavelength resolution of 0.1 nm to 100 nm. High-wavelength-resolved spectroscopic information (hyperspectral data) that splits into several hundred bands was used.

Then, the acquired two-dimensional spectral data at each imaging position is integrated to create three-dimensional spectral data having two-dimensional spatial information and one-dimensional wavelength information, and the spectrum for each wavelength is created from the generated three-dimensional spectral data. An image (hyperspectral image) was created.

After that, the spectral radiance, spectral luminance, spectral reflectance or spectral transmittance for each pixel in the created spectral image is calculated, and the spectral radiance value at each pixel is calculated as a stimulus value of a predetermined color system. An image (hereinafter, referred to as a “color space image”) in which each pixel of the two-dimensional space image is stored with a stimulus value of the color system is converted to a color that has been converted into a predetermined color system A color analysis image obtained by color calculation processing of the spatial image is displayed on the display unit by a predetermined display method.

Thereby, in the present invention, imaging of the entire predetermined measurement region including the object and acquisition of spectral radiance for each pixel of the spectral image acquired by imaging can be executed in a short time.

Specifically, the spectral radiance for each pixel in a wide two-dimensional space can be acquired in a few seconds if it is a VGA size, for example.

Furthermore, in the present invention, by making the spectral radiance a common color space, it is possible to perform color display and mutual conversion by various existing color systems without losing color information, Accurate color reproduction and information transmission can be performed regardless of individual differences between individuals in the illumination light, display environment, and visual characteristics, and intra-individual variations.

Thus, according to the present invention, uniform and objective color analysis display can be performed.

That is, according to the present invention, a light beam from an object incident through an objective lens is incident by being dispersed in a direction orthogonal to a predetermined direction by a dispersion optical element by photographing, and a signal based on the incident light beam is acquired. The two-dimensional imaging detector and the configuration provided downstream from the objective lens are integrally moved in the predetermined direction, so that the imaging position photographed by the two-dimensional imaging detector is set in the predetermined direction. Based on the signal, the moving means for moving, the first control means for controlling the timing of photographing of the two-dimensional imaging detector, the second control means for controlling the movement of the moving means, and the signal at the photographing position. Two-dimensional spectral data having one-dimensional spatial information and one-dimensional wavelength information is created, and two-dimensional spatial information and one-dimensional wavelength information are obtained from the two-dimensional spectral data at each photographing position. Spectral data creation means for creating three-dimensional spectral data, first image creation means for creating a spectral image for each wavelength from the three-dimensional spectral data, and acquisition for acquiring spectral radiance at each pixel of the spectral image Means and color space conversion processing of the spectral image to create a color space image by a predetermined color system, color calculation processing of the color space image to create a color analysis image, and the color analysis image And a second image creating means for converting the image into a display by a predetermined display method.

Further, the present invention is the above-described invention, wherein the two-dimensional imaging detector is detachable together with the optical element including the objective lens and the dispersion optical element, and the two-dimensional imaging detector and the optical element are By exchanging, it is possible to change the wavelength range, the wavelength resolution, and the number of spatial pixels that can be photographed.

In the present invention described above, the moving means is a precision linear motion stage.

Further, according to the present invention, a light beam from an object incident through an objective lens is dispersed and incident in a direction orthogonal to a predetermined direction by a dispersion optical element by photographing, and a signal based on the incident light beam is acquired. A two-dimensional imaging detector, a control means for controlling the timing of imaging of the two-dimensional imaging detector, and a two-dimensional image having one-dimensional spatial information and one-dimensional wavelength information at the imaging position based on the signal. Spectral data creating means for creating spectral data, creating three-dimensional spectral data having two-dimensional spatial information and one-dimensional wavelength information from the two-dimensional spectral data at each imaging position, and wavelength from the three-dimensional spectral data A first image creating means for creating a spectral image for each, an obtaining means for obtaining spectral radiance at each pixel of the spectral image, and a color space conversion process for the spectral image. A color space image based on a predetermined color system, color calculation processing on the color space image to generate a color analysis image, and converting the color analysis image into a display by a predetermined display method; An image creating means, and moving the positional relationship with the object in the predetermined direction so that the object is photographed while changing the photographing position in the predetermined direction. .

Since the present invention is configured as described above, there is an excellent effect that color display and mutual conversion by an arbitrary color system can be performed without loss of information.

Further, since the present invention is configured as described above, it has an excellent effect that spectral information for each pixel in a wide two-dimensional space can be acquired easily and in a short time. .

FIG. 1A is a schematic configuration explanatory view of a spectral radiance meter according to the present invention, and FIG. 1B is a view as seen from an arrow A in FIG. FIG. 2 is an explanatory diagram of a block configuration of the control unit. FIG. 3 is a flowchart showing a processing routine of imaging processing in the spectral radiance meter. FIG. 4 is a flowchart showing a processing routine of measurement processing in the spectral radiance meter. FIG. 5 is a flowchart showing the processing routine of the calibration process. 6A is an RGB image of a leaf bundle photographed by the spectral radiance meter according to the present invention, and FIG. 6B is a predetermined wavelength (band) created by the spectral radiance meter according to the present invention. 6 (c) is a graph showing the spectral reflectance, and FIG. 6 (d) shows the spectral image shown in FIG. 6 (b) as the stimulus value of the XYZ color system. 6 (e) is an image obtained by converting and displaying the spectral image shown in FIG. 6 (b) into xy chromaticity coordinates (x value). FIG. 7 is a schematic configuration explanatory diagram of a modification of the spectral radiance meter according to the present invention. FIG. 8 is a schematic configuration explanatory diagram of a modification of the spectral radiance meter according to the present invention. FIG. 9 is a schematic configuration explanatory diagram of a modification of the spectral radiance meter according to the present invention. FIG. 10A is an explanatory diagram of a pair of achromatic prisms arranged in the initial state, and FIG. 10B is a view taken in the direction of arrow B in FIG. (C) is explanatory drawing of a pair of achromatic prism of the state which functions as a parallel plane board, and FIG.10 (d) is C arrow line view of FIG.10 (c). 11 (a) and 11 (b) are schematic configuration explanatory views of a modification of the spectral radiance meter according to the present invention.

Hereinafter, an example of an embodiment of a spectral radiance meter according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a schematic structural explanatory view of a spectral radiance meter according to the present invention, and FIG. 1B is a view as viewed in the direction of arrow A in FIG. FIG. 2 is a block diagram illustrating the control unit.

The spectral radiance meter 10 shown in FIG. 1 includes an objective lens 12 that receives a light beam from a predetermined measurement region including an object 200, a precision linear motion stage 14 that moves in the Y-axis direction in an XYZ orthogonal coordinate system, A slit plate 16 disposed so that a slit opening 16a extending in the Z-axis direction is positioned on the image plane of the objective lens 12, and a collimating lens 18 that collimates the light beam that has passed through the slit opening 16a; On the image plane of the imaging lens 22, the dispersion optical element 20 that disperses the parallel light from the collimating lens 18 in the Y-axis direction, the imaging lens 22 that forms an image of the light beam emitted from the dispersion optical element 20, The two-dimensional imaging detection unit 24, the precision linear motion stage 14, and the two-dimensional imaging detection unit 24, which are arranged so that the detection unit 24a is located, are controlled and the two-dimensional imaging detection unit 24 is controlled. It is constituted by a control unit 26 for processing the al outputted information.

More specifically, the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detection unit 24 are fixedly disposed on the precision linear motion stage 14. Along with the movement in the Y-axis direction, the movement in the Y-axis direction is integrated.

It should be noted that since the precision linear motion stage 14 can use a conventionally known technique, a detailed description thereof will be omitted.

The slit plate 16 is disposed so that the light beam from the objective lens 12 passes through a slit opening 16a extending in the Z-axis direction.

Further, the dispersion optical element 20 can use, for example, a diffraction grating, a prism, or a grism. The grism is a direct-view diffraction grating that combines a transmission diffraction grating and a prism.

The diffraction grating, prism, or grism is disposed so as to disperse the incident light beam in the X-axis direction perpendicular to the Z-axis direction that is the extension direction of the slit opening 16a.

The objective lens 12, the slit plate 16, the collimating lens 18, the dispersion optical element 20, and the imaging lens 22 are configured to be exchangeable as appropriate.

The two-dimensional imaging detector 24 is an area sensor in which the detection unit 24a is arranged in parallel with the Z axis and the Y axis (that is, parallel to the primary image plane and parallel to the YZ plane).

The two-dimensional imaging detector 24 has a replaceable configuration, and the two-dimensional imaging detector 24 used in the spectral radiance meter 10 according to the present invention has a spatial pixel number of 1 to 29 million pixels. The obtainable wavelength range is 200 nm to 13 μm, and the wavelength resolution is 0.1 nm to 100 nm.

Therefore, in the spectral radiance meter 10, the wavelength range, wavelength resolution, and number of spatial pixels in the acquired spectral image can be changed.

That is, in the spectral radiance meter 10, the two-dimensional imaging detector 24 having a different wavelength range, wavelength resolution, number of spatial pixels, and the like is replaced, and the objective lens 12, the slit plate 16, the collimating lens 18, the dispersion optical element 20, and the like. By appropriately replacing the imaging lens 22, it is possible to change the wavelength range that can be photographed, wavelength resolution, the number of spatial pixels, and the like.

Further, the control unit 26 is connected to the precision linear motion stage 14 and the two-dimensional imaging device 24, and is configured by, for example, a microcomputer or a general-purpose personal computer.

Then, the control unit 26 moves the imaging control unit 30 that controls the timing at which the two-dimensional imaging detector 24 acquires an electrical signal (that is, the timing for imaging) and the precision linear motion stage 14 in the Y-axis direction. The movement control unit 32 that controls the direction, the amount of movement, and the timing of movement, the spectral data creation unit 34 that creates spectral data based on the electrical signal from the two-dimensional imaging detector 24, and the spectral data creation unit 34 A spectral image is created based on the spectral data obtained, the created spectral image is converted into a predetermined color system, and then color calculation processing is performed to obtain a color analysis image. And an image creation unit 36 for outputting an image processed by the display method to a display unit (not shown).

More specifically, when the information indicating that the precision linear motion stage 14 is moved is output from the movement control unit 32, the imaging control unit 30 performs imaging in the two-dimensional imaging detector 24 (that is, electric in the two-dimensional imaging detector). Signal is acquired, and information indicating that photographing has been performed is output to the movement control unit 32.

Further, the imaging control unit 30 determines whether or not the precision linear motion stage 14 has been moved until the imaging position in the predetermined measurement region including the object 200 reaches the imaging end position, and the imaging end position is determined from the movement control unit 32. When the information indicating that the movement has been performed is output, the photographing process is terminated after photographing.

The movement control unit 32 moves the precision linear motion stage 14 in the Y-axis direction within a predetermined imaging area including the one end 200c in the Y-axis direction of the object 200 and the other end 200d. It is sequentially moved at a predetermined interval according to the slit width. Thereby, the photographing position in the predetermined measurement area is moved in the Y-axis direction.

More specifically, the movement control unit 32 moves the precise linear motion stage 14 so that the photographing position of the two-dimensional imaging detector 24 becomes the photographing start position when the operator gives an instruction to start photographing. Information indicating that the stage 14 has been moved is output to the imaging control unit 30.

Then, when the information indicating that photographing has been performed is output from the photographing control unit 30, the movement control unit 32 moves the precision linear motion stage 14 at a predetermined interval corresponding to the slit width of the slit opening 16a. Information indicating that the linear motion stage 14 has been moved is output to the imaging control unit 30.

In addition, when the precise linear motion stage 14 is moved until the photographing position of the two-dimensional imaging detector 24 reaches the photographing end position, the movement control unit 32 outputs information to the photographing control unit 30 that it has moved to the photographing end position. .

Further, the spectral data creation unit 34 creates and creates two-dimensional spectral data having one-dimensional spatial information and one-dimensional wavelength information based on the electrical signal output from the two-dimensional imaging detector 24. The dimensional spectral data is output to and stored in the storage unit 52 provided in the control unit 26.

Note that the one-dimensional wavelength information created based on the electrical signal output from the two-dimensional imaging detector 24 has a predetermined wavelength range of 200 nm to 13 μm and a wavelength resolution of 0.1 nm to 100 nm. This is high-wavelength-resolved spectroscopic information split into several hundred bands with a predetermined wavelength resolution.

Further, the spectral data creation unit 34 uses the two-dimensional spectral data stored in the storage unit 52 to complete two-dimensional spatial information and one-dimensional wavelength information (high wavelength resolution spectroscopy) when imaging at all imaging positions is completed. Information) is generated, and the generated three-dimensional spectral data is output to the storage unit 52 and stored therein.

The image creation unit 36 creates a spectral image creation unit 38 that creates a spectral image for each wavelength based on the three-dimensional spectral data created by the spectral data creation unit 34, and the spectral image created by the spectral image creation unit 38. A color analysis image creating unit 40 that performs conversion to a predetermined color system, performs color calculation processing to create a color analysis image, and performs processing for displaying the created color analysis image by a predetermined display method Has been.

More specifically, the spectroscopic image creation unit 38 performs three-dimensional spectroscopic data spectrally divided into several hundred bands with a predetermined wavelength range of 200 nm to 13 μm and a predetermined wavelength resolution within a range of 0.1 nm to 100 nm. Based on the above, a spectral image for each band (each wavelength) is acquired.

Further, the color analysis image creation unit 40 performs calibration processing for performing dark noise correction processing, inter-image sensitivity deviation correction processing, luminance calibration processing, and light source correction processing on the spectral image created by the spectral image creation unit 38. The spectral luminance (cd / m ² · nm) is calculated from the unit 42 and the spectral radiance (W / sr · m ² · nm) calculated at the time of the luminance calibration processing, and a sensitivity correction coefficient and luminance calibration which will be described later are calculated. A calculation unit 44 for calculating a coefficient, a spectral reflectance, and the like; and a spectral image for each wavelength for which the spectral radiance of each pixel is calculated are converted into a predetermined color system, color calculation processing is performed, and a color analysis image is converted A color analysis image acquisition unit 50 that performs processing for generating and displaying the generated color analysis image by a predetermined display method is configured.

The calibration processing unit 42 performs dark noise correction (dark correction) processing for removing noise caused by dark current in the two-dimensional imaging detector 24. Further, in order to correct the sensitivity deviation for each pixel of the two-dimensional imaging detector 24, the sensitivity deviation correction process between pixels is performed on the spectral image subjected to the dark noise correction process using the sensitivity correction coefficient. Further, the luminance calibration processing is performed on the spectral image that has been subjected to the inter-pixel sensitivity deviation correction processing using the luminance calibration coefficient. Furthermore, a light source correction process is performed for correcting the illumination unevenness of the light source light in the space in the spectral image subjected to the dark noise correction process and obtaining the spectral reflectance or the spectral transmittance of the object 200.

Here, the dark noise correction data used in the dark noise correction process is obtained by performing the photographing with the two-dimensional imaging detector 24 in the light-blocking state before the measurement of the object 200. This is spectral image data for each wavelength created based on the data. Note that the shooting procedure at this time is the same as the shooting process described later.

Further, the sensitivity correction coefficient is obtained by photographing light source light (hereinafter, referred to as “uniform standard light source”) in which the spatial distribution of radiance is made uniform by an integrating sphere or the like before measuring the object 200. 3D spectroscopic data. Note that the shooting processing procedure at this time is the same as the shooting processing described later.

That is, the sensitivity correction coefficient is a specified pixel (single pixel or average of a plurality of pixels) in a spectral image for each wavelength based on three-dimensional spectral data obtained by photographing a uniform standard light source with the two-dimensional imaging detector 24. 3) Spectral data having a correction coefficient for each pixel of the spectral image for each wavelength by calculating the correction coefficient for each pixel by dividing the reference value by the output value of each pixel. Created as The calculation of the sensitivity correction coefficient is performed by the calculation unit 44 and is output to and stored in the storage unit 52.

Further, the luminance calibration coefficient is obtained by photographing a light source light (hereinafter referred to as “spectral radiance standard light source”) having a spectral radiance value before measurement of the object 200. This is one-dimensional data created based on the data. Note that the shooting procedure at this time is the same as the shooting process described later.

That is, the luminance calibration coefficient is one-dimensional data corresponding to each wavelength, and the spectral radiance value obtained for each wavelength of the spectral radiance standard light source is obtained by photographing the spectral radiance standard light source. A luminance calibration coefficient having a conversion coefficient for each wavelength is created by dividing by the output value of a designated pixel (which may be a single pixel or an average of a plurality of pixels) in each spectral image. Note that the calculation of the luminance calibration coefficient is performed by the calculation unit 44 and output to the storage unit 52 for storage.

Further, the light source data is created as three-dimensional spectroscopic data acquired by photographing the reflected light obtained by irradiating the light source light to a reflection standard such as a standard white plate before observing the object 200. Note that the shooting processing procedure at this time is the same as the shooting processing described later. The light source light is light from a light source provided separately from the spectral radiance meter used for measurement using the spectral radiance meter.

Furthermore, the spectral reflectance or spectral transmittance R (λ) of each pixel in the spectral image for each wavelength (λnm) is expressed by the following equation.
R (λ) = C (λ) / E (λ)
R (λ): Spectral reflectance or spectral transmittance for each pixel of the spectral image C (λ): Output value of each pixel of the spectral image for each wavelength acquired by measurement of the object 200 E (λ): Light source Output value of pixel corresponding to C (λ) of spectral image for each wavelength of data

Note that such light source data and spectral reflectance or spectral transmittance are calculated by the calculation unit 44 and output to the storage unit 52 for storage.

The calculation unit 44 calculates the spectral luminance L (λ) (cd / m ² · nm) from the spectral radiance Le (λ) (W / sr · m ² · nm) in the spectral image for each wavelength processed by the calibration processing unit 42. nm).

Specifically, it is calculated by the following formula.
L (λ) = Km × Le (λ) × V (λ)
L (λ): Spectral luminance (cd / m ² · nm) for each pixel of the spectral image
Le (λ): Spectral radiance (W / sr · m ² · nm) for each pixel of the spectral image
V (λ): CIE standard spectral luminous efficiency Km: Maximum luminous efficacy (683lm · W ⁻¹ )

As for the method for calculating the spectral luminance from such spectral radiance, conventionally known techniques (for example, Japanese Society for Color Science (ed.), “New Color Science Handbook (Third Edition)”, University of Tokyo Press, pp. 51-53, 2011.), detailed description thereof will be omitted.

The color analysis image acquisition unit 50 is set using spectral radiance, spectral luminance, spectral reflectance, and the like in each pixel of the spectral image for each wavelength acquired by measurement of the object 200 processed in the calibration processing unit 42. Color space conversion processing is performed for conversion to the specified color system.

Specifically, using color matching functions corresponding to the color systems stored in advance in the storage unit 52, color calculation is performed on the spectral image for each wavelength for which the spectral radiance of each pixel has been calculated. To obtain a color space image having a stimulus value in a color system of a predetermined standard for each pixel. In this color space conversion processing, spectral luminance may be used in the process, but basically processing is performed using spectral radiance.

That is, in this color space conversion process, conversion to an arbitrary color space can be performed by changing the color matching function or constant according to the color system. For example, conversion to the XYZ color system is as follows: It is as follows.

X, Y and Z are tristimulus values, and

Is a color matching function, and Δλ is a wavelength interval.

In the case of an object color, it is calculated by the following formula.

X, Y and Z are tristimulus values, and

Is a color matching function, Δλ is a wavelength function, k is a coefficient for matching with a corresponding photometric unit, and S (λ) is a relative spectral radiance of the light source light. It is.

Further, the color analysis image acquisition unit 50 performs a color calculation process on the acquired color space image using a conversion function stored in advance in the storage unit, so that a color analysis value (for example, a color analysis value corresponding to the purpose) is obtained. A color analysis image having a chromaticity coordinate value and a color rendering evaluation number) in each pixel is acquired.

For example, conversion coefficients to xy chromaticity coordinates are as follows.

Note that x (λ), y (λ), and z (λ) are xy chromaticity coordinates,

Is a color matching function.

In addition, conventionally known techniques (for example, the Japan Color Society (ed.), “New Color Science Handbook (3rd edition)”, University of Tokyo Press, pp. 81-86, 2011.) are used for such methods. Therefore, the detailed description will be omitted.

Then, the color analysis image acquisition unit 50 performs a process of converting the acquired color analysis image into a display by a predetermined display method. As such a predetermined display method, various display methods can be used. For example, there is a display method in which a color gradation is assigned to each intensity on the color coordinate to form a gradation image.

The color system standards include, for example, JIS standards (Japanese Industrial Standards), NDS standards (Ministry of Defense standards), ISO standards (International Standard Organization), CIE standards (International Lighting Commission), ASTM standards (ASTM International). ), IEC standard (International Electrotechnical Commission), ANSI C78.377 (American Standards Association), NTSC color standard, Pantone, RAL, NCS (Natural Color System), XYZ (Yxy) color system (CIE color system), RGB color system, L ^* u ^* v ^* color system, L ^* a ^* b ^* color system, L ^* c ^* h ^* color system, Hunter Lab color system, Munsell color system, Ostwald color system , DIN color system, PCCS color system (Nippon Color Co., Ltd. color scheme), DIC color guide, Japan Paint Manufacturers Association standard color, HSV color space, HLS color space, CMYK color space , CMY color space, RGBA color space, RGB color space, sRGB / AdobeRGB color space, sYcc color space, xvYcc color space, YCbCr color space, architectural design color chart, paint color sample book, etc. The display is not limited to the above, and color display by the color systems of various existing standards is possible.

In the above configuration, when the color information of the object 200 is measured by the spectral radiance meter 10 according to the present invention, first, one end of the object 200 in the Z-axis direction by the two-dimensional imaging detector 24. The operator gives an instruction to start measurement in a state where 200a and the other end 200b can be photographed.

When the operator gives an instruction to start measurement, the control unit 26 starts imaging processing.

Here, the flowchart of FIG. 3 shows the detailed processing contents of the imaging process in the spectral radiance meter 10 according to the present invention. In this imaging process, first, the imaging position by the two-dimensional imaging detector 24 is determined. The precision linear motion stage 14 is moved so as to coincide with the imaging start position (step S302).

This imaging start position is set in advance, and is, for example, one end in the Y-axis direction in a predetermined measurement area including the object 200.

That is, in the process of step S302, the movement control unit 32 moves the precision linear motion stage 14 to a position where the imaging position coincides with the imaging start position by the two-dimensional imaging detector 24, and the precision linear motion stage 14 is Information indicating that it has moved is output to the imaging control unit 30.

Next, the imaging control unit 30 executes processing for imaging in the two-dimensional imaging detector 24 (step S304).

That is, in the process of step S304, the imaging control unit 30 performs imaging (acquisition of electric signals) in the two-dimensional imaging detector 24 and outputs information indicating that imaging has been performed to the movement control unit 32.

Specifically, for example, when a light beam from the other end 200d of the target 200 in the Y-axis direction is incident on the two-dimensional imaging detector 24 by photographing, the two-dimensional imaging detector 24 receives the light of the incident light. The intensity distribution is converted into an electrical signal, and this electrical signal is output to the spectral data creation unit 34.
Thereafter, the spectral data creating unit 34 creates two-dimensional spectral data having one-dimensional spatial information and one-dimensional wavelength information based on the electrical signal output from the two-dimensional imaging detector 24. The created two-dimensional spectroscopic data is output to and stored in the storage unit 52.

Then, when shooting is performed by the two-dimensional imaging detector 24, the movement control unit 32 moves the precision linear motion stage 14 at a predetermined interval (step S306).

That is, in the process of step S306, the movement control unit 32 moves the precision linear motion stage 14 at a predetermined interval and outputs information to the imaging control unit 30 that the precision linear motion stage 14 has moved. To do.

At this time, when the precise linear motion stage 14 is moved until the photographing position of the two-dimensional imaging detector 24 reaches the photographing end position, the movement control unit 32 outputs information indicating that it has moved to the photographing end position. The Rukoto.

Thereafter, the imaging control unit 30 determines whether or not the precise linear motion stage 14 has moved until the imaging position of the two-dimensional imaging detector 24 reaches the imaging end position (step S308).

Note that this photographing end position is set in advance, and is, for example, the other end in the Y-axis direction in a predetermined photographing region.

That is, in the determination process of step S308, the imaging control unit 30 determines whether information indicating that the movement control unit 32 has moved to the imaging end position has been output.

That is, in the determination process in step S308, if the information indicating that the movement control unit 32 has moved to the shooting end position is not output, the shooting position of the two-dimensional imaging detector 24 is set to the shooting end in the shooting control unit 30. It is determined that the precision linear motion stage 14 has not moved until the position is reached. On the other hand, when the information indicating that the movement control unit 32 has moved to the photographing end position is output, the precise linear motion stage 14 until the photographing position of the two-dimensional imaging detector 24 reaches the photographing end position in the photographing control unit 30. Is determined to have moved.

If it is determined in step S308 that the imaging linear motion stage 14 has not moved until the imaging position of the two-dimensional imaging detector 24 reaches the imaging end position, the process returns to step S304, and the process of step S304. Perform the following processing.

On the other hand, if it is determined in step S308 that the linear motion stage 14 has moved until the imaging position of the two-dimensional imaging detector 24 reaches the imaging end position, the two-dimensional imaging detector 24 at the imaging end position. Then, photographing (acquisition of electrical signals) is performed (step S310), and this photographing process is terminated.

When the photographing process is completed, the measurement process is started next.

Here, the flowchart of FIG. 4 shows the detailed processing contents of the measurement process in the spectral radiance meter 10 according to the present invention. In this measurement process, first, each spectral position is taken by the spectral data creation unit 34. 2D spectroscopic data having 1D spatial information and 1D wavelength information (high wavelength resolution spectroscopic information) acquired in step 2 is integrated to obtain 2D spatial information indicating information in a predetermined measurement region and 1D Three-dimensional spectroscopic data having wavelength information is created (step S402).

Next, the spectral image creation unit 38 creates a spectral image (hyperspectral image) for each wavelength in the created three-dimensional spectral data (step S404), and then performs calibration processing for the created spectral image for each wavelength. This is performed (step S406).

Here, FIG. 5 shows a flowchart showing the detailed processing contents of the calibration processing. In this calibration processing, first, dark noise correction processing is performed (step S502).

That is, in the process of step S502, the dark noise correction process is performed using the dark noise correction data created in advance and stored in the storage unit 52.

Specifically, in the calibration processing unit 42, the dark noise correction data of the corresponding wavelength with respect to the output value in each pixel of the spectral image for each wavelength acquired by photographing the object 200 created in the process of step S404. The output value of the corresponding pixel in is subtracted.

Next, a sensitivity deviation correction process between pixels is performed on the spectral image for each wavelength subjected to the dark noise correction process in this way (step S504).

That is, in the processing of step S504, the sensitivity correction that has been created in advance and stored in the storage unit 52 for each pixel of the spectral image for each wavelength that has undergone dark noise correction processing in the calibration processing unit 42. Multiply by a coefficient.

Thereafter, a luminance calibration process is performed on the spectral image for each wavelength subjected to the inter-pixel sensitivity deviation correction process (step S506).

That is, in the process of step S506, the calibration processing unit 42 creates and stores in advance in the storage unit 52 the pixel output value of the spectral image for each wavelength subjected to the inter-pixel sensitivity deviation correction processing. Multiply by the luminance calibration factor. In addition, what was obtained by multiplying the luminance calibration coefficient indicates the spectral radiance at each pixel of the spectral image for each wavelength.

Then, the calculation unit 44 calculates the spectral luminance at each pixel of the spectral image for each wavelength from the acquired spectral radiance at each pixel of the spectral image for each wavelength (step S508), and the analysis processing at step S408. Proceed to processing.

In the process of step S508, the light source correction process (step S408) is performed. In the calibration processing unit 42, each pixel of the spectral image for each wavelength subjected to the dark noise correction process acquired in the process of step S502. The output value of the corresponding pixel in the spectral image of the wavelength corresponding to the light source data is divided from the output value of the light source data, and the light source correction process is performed, so that the spectral for each pixel in the spectral image for each wavelength of the object 200 is obtained. Obtain reflectance or spectral transmittance.

Next, the color analysis image acquisition unit 50 acquires a color space image (step S410).

That is, in the process of step S410, the spectral radiance, spectral luminance, and spectral reflectance or spectral transmittance of each pixel are stored in the storage unit 52 for the spectral images for each wavelength. A color space image represented by a color system of a preset standard is acquired using a color matching function corresponding to each color system.

Thereafter, the obtained color space image is subjected to color calculation processing using a conversion function stored in advance in the storage unit 52 to obtain a color analysis image (step S412). A process of converting to display by the display method is performed, and the result is output to a display unit (not shown) (step S414), and the measurement process is terminated. A display unit (not shown) performs display based on the information output by the process of step S414.

Here, an experimental result of an experiment in which the object 200 is measured using the spectral radiance meter 10 according to the present invention will be described.

Using a leaf bundle in which fresh leaves (natural leaves) and artificial leaves (shaped leaves) are mixed as an object, this leaf bundle is treated with halogen light (light from a light source provided separately from the spectral radiance meter 10). ) Left below.

Then, halogen light was irradiated obliquely from above, and measurement was performed with the spectral radiance meter 10 from a distance of 45 cm in front.

In the measurement process, color analysis is performed based on the spectrum information after the calibration process, and color information in a two-dimensional space of a predetermined imaging region including the object 200 is displayed as an image in FIGS. ) (C) (d) (e).

6A shows an RGB image of a leaf bundle photographed by the spectral radiance meter 10, and FIG. 6B shows a predetermined wavelength created by the spectral radiance meter 10. (Band) shows a spectral image, FIG. 6 (c) shows a graph showing the spectral reflectance of the spectral image, and FIG. 6 (d) shows FIG. An image obtained by converting the spectral image shown in b) into a stimulus value of the XYZ color system (X value) is shown, and FIG. 6E shows the spectral image shown in FIG. An image converted to chromaticity coordinates (x value) is shown.

In FIG. 6C, the spectral reflectance R (λ) is calculated for each pixel of the spectral image, and the spectral reflectance of the pixel (which may be an average of a plurality of pixels) designated by the operator is displayed in a graph. It is.

FIG. 6D shows a color space image having the spectral radiance of each pixel in the spectral image for each wavelength, the color operator using the color matching function, and the stimulus value of the XYZ color system for each pixel. Among them, an image in which only the X value is displayed with a color gradation according to intensity.

Furthermore, FIG. 6 (e) performs color calculation processing on the acquired XYZ color space image using a conversion function to acquire a color analysis image having xy chromaticity coordinate values in each pixel, of which x value Is an image displayed with color gradation according to intensity.

As described above, the spectral radiance meter 10 according to the present invention includes the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detector 24 after the objective lens 12. In this way, two-dimensional spectroscopic data having one-dimensional spatial information extended in the Z-axis direction and one-dimensional wavelength information (high wavelength resolved spectroscopic information) extended in the Y-axis direction is acquired.

Then, the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detector 24 are disposed on the precision linear motion stage 14 that is movably disposed in the Y-axis direction. The shooting position in the measurement area is changed in the Y-axis direction.

Then, two-dimensional spectral data having two-dimensional spatial information and one-dimensional wavelength information is created by integrating the acquired two-dimensional spectral data at each photographing position, and a spectrum for each wavelength is created from the created three-dimensional spectral data. An image (hyperspectral image) was created.

Thereby, in the spectral radiance meter 10 according to the present invention, imaging of a predetermined measurement region including the object can be performed in a short time.

Further, the spectral radiance meter 10 according to the present invention calculates the spectral radiance, spectral luminance, spectral reflectance or spectral transmittance for each pixel of the acquired spectral image, and the color space for this spectral image. A color space image represented by a predetermined color system is acquired by performing conversion processing.

Further, the obtained color space image is subjected to color calculation processing to obtain a color analysis image, and thereafter, processing for converting into a display by a predetermined display method is performed.

Thereby, the spectral radiance meter 10 according to the present invention can acquire the spectral radiance for each pixel in a wide two-dimensional space in a short time.

Furthermore, in the spectral radiance meter 10 according to the present invention, display by various existing color systems can be performed, and unified and objective color analysis display can be performed.

Therefore, according to the spectral radiance meter 10 according to the present invention, various spatial color analyzes are required (for example, display panel color development inspection, light source inspection, industrial product color management, human visual information Objective and effective color analysis in color information as basic data) becomes possible.

The above-described embodiment may be modified as shown in the following (1) to (6).

(1) In the above-described embodiment, the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detector 24 are on the precision linear motion stage 14 that can move in the Y-axis direction. Of course, the arrangement is not limited to this.

That is, the configuration after the slit plate 16 is integrated with a configuration based on a technology capable of moving on a straight line, for example, a fluid type (hydraulic pressure, pneumatic pressure), electromagnetic type, ultrasonic type, piezo type actuator, or the like. It is good also as a structure which moves to an axial direction.

(2) In the above-described embodiment, the calibration process is performed after the spectral image for each wavelength acquired by photographing the object 200 is created. However, the present invention is not limited to this. Yes, the dark noise correction process and the light source correction process in the calibration process may be performed after an instruction from the operator, for example.

(3) In the embodiment described above, the imaging position is set to the Y axis by moving the configuration subsequent to the objective lens 12 in the Y axis direction by the precision linear motion stage 14 provided in the spectral radiance meter 10. In the spectral radiance meter 10, the objective lens 12, the slit plate 16, the collimator lens 18, the dispersion optical element 20, and the imaging lens 22 are of course not limited to this. Alternatively, the imaging position may be moved in the Y-axis direction by disposing the two-dimensional imaging detector 24 in a fixed manner and moving the positional relationship with the object 200 in the Y-axis direction.

That is, by fixing either one of the spectral radiance meter 10 or the object 200 and moving the other in the Y-axis direction, the photographing position is moved in the Y-axis direction.

Specifically, when the spectral radiance meter 10 is moved, for example, without providing the precision linear motion stage 14 in the spectral radiance meter 10, together with the objective lens 12, the slit plate 16, the collimating lens 18, the dispersion The optical element 20, the imaging lens 22 and the two-dimensional imaging detector 24 are fixedly arranged, and the fixed object 200 is controlled by a control unit provided separately from the spectral radiance meter 10. The spectral radiance meter 10 may be moved in the Y-axis direction by the moving means (refer to FIG. 11A). At this time, the control unit for controlling the moving unit and the control unit 26 of the spectral radiance meter 10 are connected, and the timing of movement and the timing of photographing are controlled.

Further, when the object 200 is moved, the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens are used together with the objective lens 12 without providing the precision linear motion stage 14 in the spectral radiance meter 10. 22 and the two-dimensional imaging detector 24 are fixedly arranged, and the object 200 is moved in the Y-axis direction with respect to the fixed spectral radiance meter 10 by moving means controlled by the control unit. (Refer to FIG. 11 (b)). At this time, the control unit for controlling the moving unit and the control unit 26 of the spectral radiance meter 10 are connected, and the timing of movement and the timing of photographing are controlled.

(4) In the above-described embodiment, the configuration after the slit plate 16 is arranged on the precision linear motion stage 14 movable in the Y-axis direction, and imaging in a predetermined imaging area including the object 200 is performed. Although the position is moved in the Y-axis direction, the present invention is not limited to this. Of course, the mechanism for moving the photographing position may have the following three configurations.

(I) Configuration in which the objective lens 12 is disposed on a precision linear motion stage (II) Configuration using a galvanometer mirror (III) Configuration using a pair of achromatic prisms (I) to (III) will be described below.

(I) Configuration in which the objective lens 12 is arranged on the precision linear motion stage FIG. 7 is a schematic configuration explanatory diagram of a modification of the spectral radiance meter according to the present invention.

A spectral radiance meter 100 shown in FIG. 7 includes an objective lens 102 that receives a light beam from a predetermined imaging region including an object 200, and a precision linear motion stage that is provided with the objective lens 102 and moves in the Y-axis direction. 104, a slit plate 16 disposed so that a slit opening 16a extending in the Z-axis direction is positioned on the image plane of the objective lens 12, and a collimator that collimates the light beam that has passed through the slit opening 16a. The lens 18, the dispersion optical element 20 that disperses the parallel light from the collimating lens 18 in the Y-axis direction, the imaging lens 22 that forms an image of the light beam emitted from the dispersion optical element 20, and the image of the imaging lens 22 The two-dimensional imaging detection unit 24, the precision linear motion stage 14, and the two-dimensional imaging detection unit 24, which are arranged so that the detection unit 24a is positioned on the surface, are controlled and two-dimensional imaging is performed. And a control unit 26 for processing information output from the output unit 24 is constructed.

Note that the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detector 24 are fixedly disposed.

In addition, the movement control unit 32 opens the precision linear motion stage 104 with a slit opening in the Y-axis direction within a predetermined imaging region including the one end 200c to the other end 200d of the object 200 in the Y-axis direction. The part 16a is sequentially moved at a predetermined interval corresponding to the width in the Y-axis direction.

More specifically, the movement control unit 32 moves the precise linear movement stage 104 so that the photographing position of the two-dimensional imaging detector 34 becomes the photographing start position when the operator instructs the start of photographing. Information indicating that the moving stage 104 has been moved is output to the imaging control unit 30.

Then, when the information indicating that photographing has been performed is output from the photographing control unit 30, the movement control unit 32 moves the precision linear motion stage 104 at a predetermined interval corresponding to the width of the slit opening 16a in the Y-axis direction. Information indicating that the precision linear motion stage 104 has been moved is output to the imaging control unit 30.

Further, when the precise linear motion stage 104 is moved until the photographing position of the two-dimensional imaging detector 24 reaches the photographing end position, the movement control unit 32 outputs information to the photographing control unit 30 that it has moved to the photographing end position. .

Then, the movement control unit 32 moves the precision linear motion stage 104 to move the shooting position, and the shooting control unit 30 performs shooting and creates spectral data based on the electrical signal from the two-dimensional imaging detector 24. The unit 34 creates two-dimensional spectroscopic data having one-dimensional spatial information and one-dimensional wavelength information (high wavelength resolution spectroscopic information).

(II) Configuration Using Galvano Mirror FIG. 8 shows a schematic configuration explanatory diagram of a modification of the spectral radiance meter according to the present invention.

The imaging unit 110 shown in FIG. 8 includes an F-θ lens 112 that receives a light beam from a predetermined imaging region including the target object 200, a galvano mirror 114 provided at the rear stage of the F-θ lens 112, and a galvano mirror. An imaging lens 116 that forms an image of the light beam reflected by 114; a slit plate 16 that is disposed so that a slit opening 16a that extends in the Z-axis direction is positioned on the image plane of the imaging lens 116; A collimating lens 18 that collimates the light beam that has passed through the slit opening 16a, a dispersion optical element 20 that disperses the parallel light from the collimating lens 18 in the X-axis direction, and a light beam emitted from the dispersion optical element 20 are combined. The imaging lens 22 is configured to have an image, and the two-dimensional imaging detection unit 24 is disposed so that the detection unit 24 a is positioned on the image plane of the imaging lens 22.

Note that the F-θ lens 114, the imaging lens 116, the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detector 24 are fixedly disposed.

The galvanometer mirror 114 reflects the light substantially collimated by the F-θ lens 112 on the reflecting surface and enters the imaging lens 116, and the reflecting surface rotates around the Z axis. It is arranged.

Then, the movement control unit 32 controls the rotation angle and rotation direction of the reflecting surface. Note that such a rotation angle and a rotation direction are set before photographing processing.

In the following description, “rotate the galvano mirror 114” means “rotate the reflecting surface of the galvano mirror 114”.

That is, the galvano mirror 114 rotates to rotate the reflection surface, and changes the reflection angle of the light collimated by the F-θ lens 112.

The movement control unit 32 also includes a galvanometer mirror so that the imaging position moves in the Y-axis direction within a predetermined imaging area including the other end 200d from one end 200c in the Y-axis direction of the object 200. 114 is sequentially rotated around the Z axis at a predetermined rotation angle corresponding to the width of the slit opening 16a in the Y axis direction.

More specifically, when the start of shooting is instructed by the operator, the movement control unit 32 rotates the galvano mirror 114 so that the shooting position of the two-dimensional imaging detector 24 becomes the shooting start position. Information about the rotation is output to the imaging control unit 30.

Then, when the information indicating that the photographing has been performed is output from the photographing control unit 30, the movement control unit 32 rotates the galvanometer mirror 114 at a predetermined rotation angle corresponding to the width of the slit opening 16a in the Y-axis direction. The information indicating that the galvano mirror 114 is rotated is output to the imaging control unit 30.

Further, when the galvano mirror 114 is rotated until the shooting position of the two-dimensional imaging detector 24 reaches the shooting end position, the movement control unit 32 outputs information indicating that the movement to the shooting end position is performed to the shooting control unit 30.

Then, the movement control unit 32 controls the rotation of the galvano mirror 114 to move the imaging position, and the imaging control unit 30 performs imaging, and based on the electrical signal from the two-dimensional imaging detector 24, spectral data. The creating unit 34 creates two-dimensional spectroscopic data having one-dimensional spatial information and one-dimensional wavelength information (high wavelength resolution spectroscopic information).

(III) Configuration Using a Pair of Achromatic Prism FIG. 9 shows a schematic configuration explanatory diagram of a modification of the spectral radiance meter according to the present invention.

The spectral radiance meter 120 shown in FIG. 9 includes a pair of achromatic prisms 122 disposed in front of the objective lens 12 on which the light beam from the object 200 is incident, and the Z-axis direction on the image plane of the objective lens 12. The slit plate 16 disposed so that the extended slit opening 16a is positioned, the collimating lens 18 that makes the light beam that has passed through the slit opening 16a parallel light, and the parallel light from the collimating lens 18 is converted into Y A dispersive optical element 20 that disperses in the axial direction, an image forming lens 22 that forms an image of the light beam emitted from the dispersive optical element 20, and a detector 24 a are disposed on the image plane of the image forming lens 22. And a two-dimensional imaging detection unit 24.

Note that the objective lens 12, the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detector 24 are fixedly disposed.

Further, the pair of achromatic prisms 122 are constituted by achromatic prisms 122-1 and 122-2, and the achromatic prisms 122-1 and 122-2 are aligned in the X-axis direction with the same apex angle direction. Arranged. In the following description, the state of the pair of achromatic prisms shown in FIGS. 10A and 10B is referred to as “initial state”.

Further, the pair of achromatic prisms 122 are rotated from the initial state by the same angle in the opposite direction to the achromatic prisms 122-1 and 122-2, respectively, under the control of the movement control unit 32.

In addition, in the pair of achromatic prisms 122, the achromatic prisms 122-1 and 122-2 rotate in opposite directions, the apex angle direction is reversed, and the Z axis direction is horizontal (FIG. 10 ( c) (Refer to (d)), it functions as a plane parallel plate.

FIG. 10C shows a state in which the achromatic prism 122-1 in FIG. 10A is rotated 90 ° in the direction of arrow I and the achromatic prism 122-2 is rotated 90 ° in the direction of arrow II. It is.

That is, the achromatic prisms 122-1 and 122-2 are configured to rotate in opposite directions around the center axis O that coincides, for example, the achromatic prism 122-1 is arranged in the direction of the arrow I. When rotating, the achromatic prism 122-2 rotates in the direction of arrow II (see FIG. 10A). At this time, each of the achromatic prisms 122-1 and 122-2 is rotatable in the range of 0 ° to 180 °.

The pair of achromatic prisms 122 having such a configuration makes it possible to change the position of the light beam incident on the two-dimensional imaging detector 24 disposed at the subsequent stage of the pair of achromatic prisms 122. As a result, the shooting position of shooting is moved in the Y-axis direction.

In addition, the movement control unit 32 is achromatic so that the shooting position moves in the Y-axis direction within a predetermined shooting region including the other end 200d from one end 200c in the Y-axis direction of the object 200. The prisms 122-1 and 122-2 are sequentially rotated around the X axis at a predetermined rotation angle according to the width of the slit opening 16a in the Y axis direction.

More specifically, the movement control unit 32 sets the achromatic prisms 122-1 and 122-2 so that the photographing position of the one-dimensional imaging detector 122 becomes the photographing start position when the operator gives an instruction to start photographing. Information indicating that the achromatic prisms 122-1 and 122-2 have been rotated in the opposite directions is output to the imaging control unit 30.

When the information indicating that the photographing has been performed is output from the photographing control unit 30, the movement control unit 32 moves the achromatic prisms 122-1 and 122-2 according to the width of the slit opening 16a in the Y-axis direction. Information indicating that the achromatic prisms 122-1 and 122-2 are rotated is output to the imaging control unit 30 by rotating at a predetermined rotation angle.

Further, the movement control unit 32 captures information that the achromatic prisms 122-1 and 122-2 are rotated until the photographing position of the two-dimensional imaging detector 24 reaches the photographing end position, and moves to the photographing end position. Output to the control unit 30.

Then, the movement control unit 32 rotates the achromatic prisms 122-1 and 122-2 to move the shooting position, and the shooting control unit 30 performs shooting, and the electrical signal from the two-dimensional imaging detector 24 is converted into an electric signal. Based on this, the spectral data creating unit 34 creates two-dimensional spectral data having one-dimensional spatial information and one-dimensional wavelength information (high wavelength resolution spectral information).

(5) In the above-described embodiment, the wavelength is changed by exchanging hardware configurations such as the objective lens 12, the slit plate 16, the collimating lens 18, the dispersion optical element 20, the imaging lens 22, and the two-dimensional imaging detector 24. The area, wavelength resolution, and number of spatial pixels are changed, but this is not limited to this. Using the functions of the shooting software, reading externally defined files or changing parameters to the worker May specify not only the wavelength range, wavelength resolution, and number of spatial pixels, but also the imaging speed, exposure time, and gain.

(6) The above-described embodiment and the modifications shown in (1) to (5) above may be combined as appropriate.

The present invention is suitable for use as a spectral radiance meter that measures a predetermined area including a target object and acquires detailed color information of the area.

10, 100, 110, 120

Spectral radiance meter

12, 102 Objective lens 14 Precision linear motion stage 16 Slit plate 18 Collimator lens 20 Dispersive

optical element

32, 116 Imaging lens 24 Two-dimensional imaging detector 26 Control unit 30 Imaging control unit 32 movement control unit 34 spectral data creation unit 36 image creation unit 38 spectral image creation unit 40 color analysis image creation unit 42 calibration processing unit 44 calculation unit 50 color analysis image acquisition unit 52 storage unit 112 F-θ lens 114 galvanometer mirror 122 pair Achromatic prisms 122-1, 122-2 Achromatic prism 200

Claims

A two-dimensional imaging detector that obtains a signal based on the incident light flux by dispersing the light flux from the object incident through the objective lens in the direction orthogonal to the predetermined direction by the dispersion optical element. When,
Moving means for moving an imaging position photographed by the two-dimensional imaging detector in the predetermined direction by integrally moving a configuration provided at a stage subsequent to the objective lens in the predetermined direction;
First control means for controlling shooting timing of the two-dimensional imaging detector;
Second control means for controlling movement of the moving means;
Based on the signal, two-dimensional spectral data having one-dimensional spatial information and one-dimensional wavelength information at the photographing position is created, and two-dimensional spatial information and one-dimensional data are obtained from the two-dimensional spectral data at each photographing position. Spectral data creating means for creating three-dimensional spectral data having wavelength information;
First image creation means for creating a spectral image for each wavelength from the three-dimensional spectral data;
Obtaining means for obtaining spectral radiance in each pixel of the spectral image;
The spectral image is subjected to color space conversion processing to create a color space image based on a predetermined color system, and the color space image is subjected to color calculation processing to generate a color analysis image. A spectral radiance meter, comprising: a second image creating means for converting to display by a display method.
The spectral radiance meter according to claim 1.
The two-dimensional imaging detector is configured to be detachable together with an optical element including the objective lens and the dispersion optical element, and by exchanging the two-dimensional imaging detector and the optical element, a wavelength region that can be photographed, Spectral radiance meter characterized in that wavelength resolution and number of spatial pixels can be changed.
The spectral radiance meter according to claim 1 or 2,
The spectral radiance meter, wherein the moving means is a precision linear motion stage.
A two-dimensional imaging detector that obtains a signal based on the incident light flux by dispersing the light flux from the object incident through the objective lens in the direction orthogonal to the predetermined direction by the dispersion optical element. When,
Control means for controlling the shooting timing of the two-dimensional imaging detector;
Based on the signal, two-dimensional spectral data having one-dimensional spatial information and one-dimensional wavelength information at the photographing position is created, and two-dimensional spatial information and one-dimensional data are obtained from the two-dimensional spectral data at each photographing position. Spectral data creating means for creating three-dimensional spectral data having wavelength information;
First image creation means for creating a spectral image for each wavelength from the three-dimensional spectral data;
Obtaining means for obtaining spectral radiance in each pixel of the spectral image;
The spectral image is subjected to color space conversion processing to create a color space image based on a predetermined color system, and the color space image is subjected to color calculation processing to generate a color analysis image. Second image creating means for converting to display by a display method;
The spectral radiance meter, wherein the object is photographed while moving the photographing position in the predetermined direction by changing the positional relationship with the object in the predetermined direction.