JP2007059179A - Calibration method, calibration device, calibration program, of illumination device, recording medium, illumination device, and image processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a calibration method of an illumination device capable of calibrating the illumination device at low cost. <P>SOLUTION: On the illumination device 3, LEDs 351, 352 and 353 of respective colors R, G and B are made to emit light, and light is irradiated on the illuminance/chromaticity calibration device 6. Color patterns of respective colors R, G and B are formed on the illuminance/chromaticity calibration device 6, the respective color component of R, G and B are extracted from illumination light through the respective color patterns, and the color components are photographed by a CCD camera 42. Since the strength of emission light of LEDs 351, 352 and 353 of the respective colors R, G and B can be obtained at every color component, and characteristics of illuminance and chromaticity of LEDs of respective colors can be calculated on the basis of data obtained through the CCD camera 42, The illumination device 3 can be calibrated on the base of the characteristics. In this case, since it is not necessary to use an expensive colors-illuminometer or the like, the illumination device 3 can be calibrated at low cost. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an illumination device calibration method, a calibration device, a calibration program, a recording medium, an illumination device, and an image processing device.

  Conventionally, a plurality of color light sources capable of emitting light of different colors, and input signal control means for individually controlling each input signal for causing each color light source to emit each color light, the input signal control means There is known an illuminating device that performs illumination with combined light of each color light emitted from each color light source under the control of an input signal by. As a color light source, it is common to use LEDs (Light Emitting Diodes) capable of emitting light of RGB colors according to an applied current (corresponding to an input signal). The applied current control means (corresponding to the input signal control means) can individually control the applied current to each LED, and can individually adjust the intensity of the emitted light of each RGB color. For this reason, illumination light having a desired intensity and a desired color can be generated as a combined light of RGB color lights.

  However, since color light sources such as LEDs have individual differences, for example, even when an equal current is applied to a plurality of R color LEDs manufactured by the same manufacturing method, the light is emitted from individual R color LEDs. There is a problem that variations in light intensity and color occur. For this reason, in order to generate illumination light having a desired intensity and a desired color, it is necessary to perform a calibration operation in consideration of individual characteristics of each RGB color LED.

  Conventionally, a calibration method using a color illuminometer is known as a calibration method for such an illumination device (see, for example, Patent Document 1). A color illuminometer is a sensor capable of measuring the illuminance and chromaticity of light. In the calibration method described in Patent Document 1, each of the R color LED, G color LED, and B color LED constituting the illumination device is sequentially and independently emitted, and the illuminance and chromaticity of these lights are sequentially measured with a color illuminometer. . Thereby, the change characteristic data of the intensity | strength (illuminance) of emitted light with respect to an applied electric current, and chromaticity can be acquired about each LED (RGB). Then, based on the obtained change characteristic data for each LED, an applied current value to each LED necessary for generating illumination light having a desired intensity and a desired color is calculated and stored in the memory. . If this operation is repeated while sequentially changing the desired intensity and desired color of the illumination light, the applied current value to each LED corresponding to each set of (desired intensity, desired color) can be stored in the memory as a table. When actually illuminating, by reading the applied current value to each LED corresponding to the desired intensity and desired color of the specified illumination light from the table stored in the memory and applying to each LED, Illumination light having a desired intensity and a desired color can be generated.

JP 2004-213986 A

  However, the color illuminance meter used in the calibration method described in Patent Document 1 is very expensive, and there is a problem that high cost is required to implement the calibration method.

  An object of the present invention is to provide a calibration method, a calibration apparatus, a calibration program, a recording medium, an illumination apparatus, and an image processing apparatus that can calibrate the illumination apparatus at low cost.

  A calibration method for an illumination device of the present invention includes a plurality of color light sources capable of emitting light of different colors, input signal control means for individually controlling each input signal for causing each color light source to emit each color light, and A calibration method for an illuminating device that performs illumination with combined light of each color light emitted from each color light source under input signal control by the input signal control means, and having at least three different spectral characteristics A spectral characteristic sample is prepared, and each color light source is sequentially emitted separately to each color light source while changing the input signal value to each color light source by the input signal control means, and each spectral characteristic sample is illuminated. Information on the intensity of light generated through the sample (hereinafter referred to as sample intensity information) is obtained for each combination of the individual color light source and the individual spectral characteristic sample. Sample intensity information acquisition step, and for each individual color light source, output light intensity information (hereinafter referred to as light source intensity information) and color information (hereinafter referred to as light source color information) with respect to an input signal to the color light source. A change characteristic (hereinafter, the light source intensity information and the change characteristic of the light source color information with respect to the input signal are collectively referred to as a light source characteristic) is calculated based on each sample intensity information acquired for each combination including the color light source. Each input signal value to each color light source required to generate illumination light having a desired intensity and a desired color with reference to the light source characteristic calculation step and the individual light source characteristics calculated for the individual color light sources And an input signal value reading step.

  In the sample intensity information acquisition step, the spectral characteristic sample is illuminated while changing the input signal value to the color light source, and the intensity information (sample intensity information) of the light generated through the spectral characteristic sample is acquired. Here, as the spectral characteristic sample, a sample having a predetermined spectral characteristic such as a color filter, a color chart, or a pigment can be used. The spectral characteristic is a general term for spectral transmittance, spectral reflectance, and the like, and is generally a characteristic related to color (hereinafter, in order to emphasize that the spectral characteristic is a characteristic related to color, Spectral characteristics (color) ". Sample intensity information is obtained for each combination of individual color light sources and individual spectral characteristic samples. For example, when calibration of an illumination device having three color light sources (corresponding to LEDs of RGB colors in Patent Document 1) is performed using three spectral characteristic samples, a total of 3 × 3 in the sample intensity information acquisition step. = 9 sample intensity information is acquired. Individual sample intensity information is intensity information (change characteristics with respect to an input signal) of light generated by illuminating one spectral characteristic sample while changing an input signal value to one color light source. Thus, it is only necessary to acquire the light intensity information, and it is not necessary to acquire the light color information. Therefore, it is not necessary to use an expensive color illuminometer or the like used in Patent Document 1, for example, the illuminance An inexpensive measuring means such as a meter or a monochrome camera can be used.

  In the subsequent light source characteristic calculation step, the light source characteristic of each color light source is calculated. For each color light source, the same number of pieces of sample intensity information as the spectral characteristic samples are obtained in the previous sample intensity information obtaining step. For example, in the above example with three spectral characteristic samples, three pieces of sample intensity information are acquired for each color light source. Here, the spectral characteristic sample illuminated by the individual color light sources plays a role of extracting a light component (color component) corresponding to its own spectral characteristic (color) from the illumination light (single emission light from each color light source). The intensity of the extracted light component (color component) constitutes sample intensity information. Therefore, a plurality (same number as spectral characteristic samples: 3 or more) of sample intensity information acquired for each color light source is respectively the light component (each color component) included in the emitted light from the color light source. Since it corresponds to the intensity, the intensity information and the color information of the emitted light from the color light source can be calculated based on the plurality of sample intensity information using a known arithmetic expression. Since the sample intensity information is acquired while changing the input signal value to each color light source, the intensity information (light source intensity information) of the emitted light with respect to the input signal to each color light source is based on the sample intensity information. ) And color information (light source color information) change characteristics (light source characteristics) can be calculated.

  Finally, in the input signal value reading step, each input signal value to each color light source necessary to generate illumination light having a desired intensity and a desired color is read with reference to the light source characteristics of each color light source.

  According to the calibration method of the present invention as described above, it is not necessary to use an expensive color illuminance meter or the like used in the calibration method of Patent Document 1, and an inexpensive measurement means such as a illuminance meter or a monochrome camera is used. Therefore, the lighting device can be calibrated at low cost.

  In the calibration method for an illumination device according to the present invention, it is preferable that a signal input step of inputting each input signal of the value read in the input signal value reading step to each color light source is provided.

  According to the calibration method having such a configuration, it is possible to generate illumination light having a desired intensity and a desired color by inputting each input signal of the value read in the input signal value reading step to each color light source. .

  In the illumination device calibration method of the present invention, a sample member having a base and the plurality of spectral characteristic samples respectively disposed in predetermined regions of the base is provided, and the sample intensity information acquisition step Then, while changing the input signal value to each color light source by the input signal control means, each color light source is sequentially emitted individually with each color light to illuminate the sample member, and the sample member is sequentially imaged to capture each individual light source. A sample image data acquisition step for acquiring image data (hereinafter referred to as sample image data) for each color light source, and a region corresponding to the individual spectral characteristic sample in each sample image data (hereinafter referred to as a spectral characteristic sample region). ) Are sequentially selected individually and in the spectral characteristic sample region selection step. A sample intensity information calculation step for calculating the sample intensity information for each combination including one spectral characteristic sample corresponding to the spectral characteristic sample area, based on the light intensity data included in the individual spectral characteristic sample area Are preferably provided.

  In the calibration method having such a configuration, the individual spectral characteristic samples are not configured as separate bodies, but are configured as a single unit by disposing the individual spectral characteristic samples on the substrate of the sample member. Thereby, the operation | work for acquiring sample intensity | strength information can be made efficient. For example, in the above example having three spectral characteristic samples, when three spectral characteristic samples are configured as separate bodies, in order to obtain three sample intensity information for each color light source, Although it is necessary to sequentially switch the three spectral characteristic samples, when three spectral characteristic samples are integrally configured as described above, it is necessary to switch the sample member (including the three spectral characteristic samples) as an illumination target. Since three pieces of sample intensity information can be acquired for each color light source in a fixed state, the work can be made more efficient.

  In the illumination apparatus calibration method of the present invention, the illumination apparatus is provided in an image processing apparatus that performs predetermined image processing on image data acquired by an imaging unit that captures an imaging target. It is preferably used for illumination, and in the sample intensity information acquisition step, each of the spectral characteristic samples is imaged by the imaging unit to acquire the sample intensity information.

  According to the calibration method having such a configuration, the sample intensity information can be acquired by using an imaging unit such as a CCD (Charge Coupled Device) camera originally provided in the image processing apparatus. Since it is not necessary to provide a means for obtaining, the lighting apparatus can be calibrated at low cost. Note that the image processing apparatus is not only an apparatus that performs processing such as enhancement, deformation, and coloring on image data, but also an apparatus that performs non-processing processing such as inspection, measurement, and classification of an imaging target based on image data. Including.

  Further, the calibration apparatus for an illumination device according to the present invention includes a plurality of color light sources capable of emitting light of different colors and input signal control means for individually controlling each input signal for causing each color light source to emit each color light. And a calibration device for an illuminating device that performs illumination with combined light of each color light emitted from each color light source under input signal control by the input signal control means, and has at least predetermined spectral characteristics different from each other Three spectral characteristic samples are prepared, each color light source is sequentially emitted separately to each color light source while changing the input signal value to each color light source by the input signal control means, and each spectral characteristic sample is illuminated. A sample of acquiring intensity information (sample intensity information) of light generated through the spectral characteristic sample for each combination of the individual color light source and the individual spectral characteristic sample. The intensity information (light source intensity information) of the emitted light with respect to the input signal to the color light source and the change characteristics (light source characteristics) of the color information (light source color information) Referring to the individual light source characteristics calculated for the individual color light sources with reference to the light source characteristic calculation means for calculating based on the sample intensity information acquired for each combination including color light sources, the desired intensity and desired color Input signal value reading means for reading each input signal value to each of the color light sources necessary for generating illumination light having the following.

  Since the calibration apparatus of the present invention having such a configuration is provided with a configuration for implementing the above-described calibration method of the present invention, the same functions and effects as the calibration method of the present invention can be achieved.

  Also, the calibration program for the illumination device according to the present invention includes a plurality of color light sources capable of emitting light of different colors and input signal control means for individually controlling each input signal for causing each color light source to emit each color light. And a calibration program for an illuminating device that performs illumination with combined light of each color light emitted from each color light source under input signal control by the input signal control means, and having at least predetermined spectral characteristics different from each other Three spectral characteristic samples are prepared, each color light source is sequentially emitted separately to each color light source while changing the input signal value to each color light source by the input signal control means, and each spectral characteristic sample is illuminated. Light intensity information generated through the spectral characteristic sample (hereinafter referred to as sample intensity information) is used for the individual color light source and the individual spectral characteristic sample. Sample intensity information acquisition step acquired for each combination, and for each individual color light source, intensity information (hereinafter referred to as light source intensity information) of emitted light with respect to an input signal to the color light source and color information (hereinafter referred to as light source color information) )) (Hereinafter referred to as light source characteristics together with the light source intensity information and the light source color information change characteristics with respect to the input signal) in the sample intensity information acquired for each combination including the color light source. Referring to the light source characteristic calculation step calculated on the basis of the individual light source characteristics calculated for the individual color light sources, each color light source required for generating illumination light having a desired intensity and a desired color is referred to. An input signal value reading step for reading each input signal value is executed by a computer.

  The recording medium of the present invention is characterized in that the calibration program is recorded and can be read by a computer.

  Since the calibration program and the recording medium having the above-described configuration are used to implement the calibration method of the present invention described above, the same operations and effects as the calibration method of the present invention can be achieved.

  Moreover, the illumination device of the present invention is calibrated by the calibration method.

  The image processing apparatus of the present invention includes an imaging unit and an illuminating device that is calibrated by the calibration method. The imaging unit that is illuminated by the illuminating device is imaged by the imaging unit and acquired. A predetermined image processing is performed on the image.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an image measuring apparatus 1 as an image processing apparatus provided with an illumination device. The image measuring apparatus 1 includes an illuminating device 3 that illuminates an object to be measured (not shown) placed on the stage 2, and an imaging unit 4 that receives reflected light from the object to be measured and images the object to be measured. The illuminance and chromaticity of the illuminating device 3 using the image measuring means 5 for measuring the size and shape of the object to be measured by image processing on the image data acquired by the imaging means 4 and the illuminance chromaticity calibration tool 6. And a calibration device 7 for performing calibration. In FIG. 1, an illuminance chromaticity calibration tool 6 is placed on the stage 2 instead of the object to be measured.

  The illuminating device 3 uses an epi-illumination device 31 that emits light from directly above the object to be measured, and a ring-shaped light beam having an optical axis A that connects the object to be measured and the imaging means 4 as a central axis. A ring illumination device 32 for irradiating the light, a transmission illumination device 33 for irradiating light to a measured object having translucency from directly below, and an illumination control device 34 are provided.

  The epi-illumination device 31 includes a casing 311, an R color LED 351, a G color LED 352, and a B color LED 353 as color light sources housed in the casing 311, and a dichroic that combines the respective color lights from the respective color LEDs 351, 352, and 353. A mirror 312 and a pair of lenses 313 for forming the combined light into parallel light beams are provided. Here, the dichroic mirror 312 is an optical element having transmission / reflection characteristics corresponding to the wavelength of light, and selectively transmits and reflects light emitted from each LED, thereby efficiently transmitting light from each LED. Can be synthesized well. The combined illumination light emitted from the epi-illumination device 31 is reflected toward the optical axis A by the mirror 314 and then reflected toward the object to be measured by the half mirror 315 provided on the optical axis A. The epi-illumination device 31 has a plurality of R-color LEDs 351, G-color LEDs 352, and B-color LEDs 353, respectively. As will be described later, a plurality of R color LEDs 351, G color LEDs 352, and B color LEDs 353 are also provided in the other illumination devices 32 and 33, respectively. In the following description, common reference numerals 351, 352, and 353 are assigned to the R color LED, the G color LED, and the B color LED, respectively, and the group of each color LED is expressed as a “group”.

  The ring illumination device 32 includes a ring-shaped casing 321 having the optical axis A as a central axis, an R color LED 351, a G color LED 352, a B color LED 353 as color light sources provided in the casing 321, and each color LED 351. A dichroic mirror 322 that synthesizes the respective color lights from 352 and 353 and a reflection mirror 323 that reflects the synthesized light toward the object to be measured. A plurality of R color LEDs 351, G color LEDs 352, and B color LEDs 353 are arranged in a ring shape so as to surround the optical axis A.

  The transmitted illumination device 33 includes a housing 331, an R color LED 351, a G color LED 352, and a B color LED 353 as color light sources provided in the housing 331, and a dichroic that synthesizes each color light from each color LED 351, 352, 353. The mirror 332 is provided with a pair of lenses 333 for forming the combined light into a parallel light flux. The combined illumination light emitted from the transmission illumination device 33 is reflected by the mirror 334 toward the object to be measured. The stage 2 has a transparent window (not shown) made of a light-transmitting material such as glass or transparent plastic, and the combined illumination light emitted from the transmissive illumination device 33 passes through the transparent window. The object to be measured that is transmitted and placed on the stage 2 is irradiated.

  The illumination control device 34 corresponds to the input signal control means in the present invention, and as shown in FIG. ), An R color LED driver 341, a G color LED driver 342, and a B color LED driver 343.

  The imaging means 4 includes a condenser lens 41 that collects reflected light from the object to be measured, and a monochrome CCD camera 42 that receives light from the condenser lens 41 and can acquire image data of the object to be measured. It is prepared for. The monochrome CCD camera 42 has a large number of imaging pixels (configured by a CCD) arranged in alignment on the light receiving surface. Each imaging pixel is configured to be able to output data corresponding to the received light luminance.

  The illuminance chromaticity calibration tool 6 corresponds to the sample member in the present invention, and a plurality of illuminance chromaticity calibration tools 6 are prepared corresponding to the respective lighting devices 31, 32 and 33. Each of the illuminance chromaticity calibration tools 6 is configured by arranging a color pattern having RGB colors on a substrate (corresponding to a base in the present invention). In addition, the external appearance of the illumination intensity chromaticity calibration tool 6 is shown with the perspective view in FIG.

  FIG. 4 is a cross-sectional view showing the illuminance chromaticity calibration tool 61 for the epi-illumination device 31. The illuminance chromaticity calibration tool 61 includes a translucent substrate 611 made of glass or the like, and a dyeing method, a pigment dispersion method, a printing method, an electrodeposition method, and an electrodeposition transfer on the side of the substrate 611 that receives epi-illumination light. And a color pattern 612 formed by a method such as a resist direct electrodeposition method, and a reflecting portion 613 formed by aluminum vapor deposition or the like on the side opposite to the side on which the color pattern 612 of the substrate 611 is formed. Has been. In the color pattern 612, RGB color portions having known spectral characteristics are periodically arranged as shown in FIG. Here, each color portion of RGB constitutes a spectral characteristic sample in the present invention. Therefore, in the present embodiment, a total of three spectral characteristic samples corresponding to each color of RGB are prepared. When the epi-illumination device 31 is calibrated, the illumination light from the epi-illumination device 31 is irradiated to the illuminance chromaticity calibration tool 61 substantially vertically. The illumination light is colored by the color pattern 612, is reflected by the reflection unit 613, and travels toward the image pickup unit 4 (see the alternate long and short dash line in FIG. 4). Strictly speaking, the coloring by the color pattern 612 means that each RGB color portion in the color pattern 612 extracts a color component (RGB component) corresponding to its own spectral characteristic from the illumination light.

  In addition, as shown in FIG. 6, instead of forming the reflection portion 613 on the substrate 611, the illuminance chromaticity calibration tool 61 for the epi-illumination device 31 is provided by arranging the reflection mirror 614 at a position facing the substrate 611. It may be configured. In short, the illuminance chromaticity calibration tool 61 for the epi-illumination device 31 may be provided with a reflection part that reflects the illumination light from the epi-illumination device 31 toward the imaging means 4.

  FIG. 7 is a cross-sectional view showing the illuminance chromaticity calibration tool 62 for the ring illumination device 32. The illuminance chromaticity calibration tool 62 is formed of a non-transparent substrate 621 made of metal or the like, and RGB color pigments on the substrate 621 receiving ring illumination light by a printing method, a transfer method, or the like. A color pattern 622. The color pattern 622 is the same as that shown in FIG. When the ring illumination device 32 is calibrated, illumination light from the ring illumination device 32 is obliquely applied to the illuminance chromaticity calibration tool 62. The illumination light is colored and diffusely reflected by the color pattern 622, and a part of the illumination light is directed to the image pickup means 4 (see the alternate long and short dash line in FIG. 7). Note that the color pattern 622 is formed so as to protrude from the surface of the substrate 621 so that illumination light irradiated obliquely to the substrate 621 can be efficiently diffused and reflected.

  FIG. 8 is a cross-sectional view showing the illuminance chromaticity calibration tool 63 for the transmission illumination device 33. The illuminance chromaticity calibration tool 63 includes a transparent substrate 631 made of glass or the like, and a dyeing method, a pigment dispersion method, a printing method, an electrodeposition method, an electrodeposition transfer method, a resist direct electrodeposition method on the substrate 631. And a color pattern 632 formed by such a method. The color pattern 632 is the same as that shown in FIG. At the time of calibration of the transmissive illumination device 33, the illumination light from the transmissive illumination device 33 is transmitted through the stage 2 and is irradiated to the illuminance chromaticity calibration tool 63 substantially perpendicularly. The illumination light is transmitted through the substrate 631, is colored by the color pattern 632, and travels toward the imaging unit 4 (see the alternate long and short dash line in FIG. 8).

  As shown in FIG. 2, the calibration device 7 includes a control unit 71 that performs general control in calibration of the lighting device 3, and a memory 72 that stores various data related to calibration of the lighting device 3. And input means 73 for inputting desired illuminance and desired chromaticity of the illumination light of the illumination device 3 to the control unit 71 based on a user operation.

  The control unit 71 includes a color component intensity acquisition unit 711 as a sample intensity information acquisition unit, an LED characteristic calculation unit 712 as a light source characteristic calculation unit, an applied current value reading unit 713 as an input signal value reading unit, and a signal input Current applying means 714 as means.

  The color component intensity acquisition means 711 includes a calibration tool image data acquisition means 7111 as sample image data acquisition means, a color area selection means 7112 as spectral characteristic sample area selection means, and a color component intensity calculation as sample intensity information calculation means. And means 7113.

  The calibration tool image data acquisition means 7111 sequentially applies to the RGB color LED groups 351, 352, and 353 while changing the applied current values to the RGB color LED groups 351, 352, and 353 by the drivers 341, 342, and 343 in the illumination control device 34. The illuminance chromaticity calibration tool 6 placed on the stage 2 is illuminated by emitting light of each color of RGB alone, and the illuminance chromaticity calibration tool 6 is sequentially imaged by the imaging means 4, and each color LED group 351. Image data (corresponding to sample image data in the present invention) of the illuminance chromaticity calibration tool 6 is acquired for each of 352 and 353.

  The color region selection unit 7112 is a region corresponding to each color portion of RGB in the color pattern of the illuminance chromaticity calibration unit 6 (spectral characteristic sample in the present invention) in each calibration unit image data acquired by the calibration unit image data acquisition unit 7111. (Corresponding to the area) are selected one after another.

  The color component intensity calculation unit 7113 is generated based on the light intensity data included in each color region selected by the color region selection unit 7112 via the RGB color portions in the color pattern of the illuminance chromaticity calibration tool 6. The intensity of the color component (corresponding to the sample intensity information in the present invention) is calculated.

  The LED characteristic calculation means 712 has the illuminance (corresponding to the light source intensity information in the present invention) and the chromaticity (corresponding to the light source color information in the present invention) of the emitted light with respect to the applied current for each of the LED groups 351, 352, and 353. A change characteristic (LED characteristic: corresponding to the light source characteristic in the present invention) is calculated based on each color component intensity acquired by the color component intensity acquisition means 711.

  The applied current value reading unit 713 refers to the LED characteristics calculated for each of the LED groups 351, 352, and 353 by the LED characteristic calculation unit 712, and has the desired illuminance and desired chromaticity input by the input unit 73. The applied current values to the LED groups 351, 352, and 353 necessary for generating the illumination light are read.

  The current applying unit 714 applies the current of each value read by the applied current value reading unit 713 to the corresponding color LED group 351, 352, 353, respectively.

In the memory 72, for example, a table (described later) created as a result of calibration of the lighting device 3 is stored.
The input unit 73 is configured by a lever or a button that can be operated by the user.

Next, a calibration method for the illumination device 3 that can be implemented with the above configuration will be described.
As described above, in this embodiment, three illumination devices, that is, the epi-illumination device 31, the ring illumination device 32, and the transmission illumination device 33 are provided, and calibration is performed for each individual illumination device.

First, the illumination device to be calibrated is selected, and the illuminance chromaticity calibration tool 6 for the selected illumination device is placed at a predetermined position on the stage 2. That is, when the epi-illumination device 31 is calibrated, the illuminance chromaticity calibration tool 61 shown in FIG. 4 or 6 is placed on the stage 2, and when the ring illumination device 32 is calibrated, it is shown in FIG. When the illuminance chromaticity calibration tool 62 is placed on the stage 2 and the transmitted illumination device 33 is calibrated, the illuminance chromaticity calibration tool 63 shown in FIG. 8 is placed on the stage 2. As will be described below, in order to calibrate the illumination device 3 with high accuracy, it is necessary to place the illuminance chromaticity calibration tool 6 at a predetermined position on the stage 2 as accurately as possible. Therefore, the stage 2 is provided with a mark (not shown) indicating the arrangement position of the illuminance chromaticity calibration tool 6, and the illuminance chromaticity calibration tool 6 can be accurately arranged by matching with the mark. It is possible to improve the calibration accuracy of the lighting device 3. FIG. 1 shows a state at the time of calibration of the epi-illumination device 31, FIG. 9 shows a state at the time of calibration of the ring illumination device 32, and FIG. 10 shows a state at the time of calibration of the transmission illumination device 33.
Note that the lighting device calibration method described in detail below is applicable to any of the lighting devices 31, 32, and 33.

As shown in the flowchart of FIG. 11, the calibration method of the illumination device according to the present embodiment includes an instruction value / illuminance table creation step ST1 in which desired illuminance with respect to an instruction value of the measurement software is described, and each color LED group 351, 352. LED characteristic calculation step ST2 for calculating the characteristics of 353, and based on the LED characteristics calculated in the LED characteristic calculation step ST2, the desired chromaticity is synthesized with the indicated value of the measurement software and the desired illuminance indicated by the indicated value Instruction value / current value provisional table creation step ST3 for creating a provisional table of instruction values / current values indicating the relationship with the applied current values to the LED groups 351, 352, 353 necessary for generating light, and instructions A verification process ST4 for verifying the temporary value / current value table, and a correction process for correcting the temporary value / current value temporary table based on the verification result in the verification process ST4 It is provided with a ST7, the.
Each of these steps is executed by the calibration device 7 in accordance with a program stored in advance in the memory 72 of the calibration device 7.

In ST1, an instruction value / illuminance table is created.
The relationship between the indication value [%] and the illuminance [lx] of the measurement software corresponds to the indication value as shown in FIG. 12A, where the horizontal axis indicates the indication value and the vertical axis indicates the illuminance. It is represented by a control curve that determines the illuminance. This control curve can be stored in the memory 72 in advance, or can be newly input by the user using the input means 73 and stored in the memory 72. Then, the control unit 71 reads the illuminance corresponding to the instruction value based on the control curve, and an instruction value / illuminance table in which the illuminance corresponding to the instruction value as shown in FIG. The

In ST2, LED characteristics are calculated.
As shown in the flowchart of FIG. 13, ST2 includes a process ST21 for calculating the characteristics of the R color LED group 351 with respect to the applied current value, a process ST22 for calculating the characteristics of the G color LED group 352 with respect to the applied current value, and application. Step ST23 for calculating the characteristics of the B-color LED group 353 with respect to the current value, step (average chromaticity calculation step) ST24 for obtaining the average value of the chromaticity of the emitted light of each color LED group 351, 352, 353, and chromaticity And a step (representative mixture ratio calculation step) ST25 for obtaining a representative mixture ratio for generating synthesized light having desired chromaticity based on the average value.

  In ST21, the color component intensity acquisition unit 711 and the LED characteristic calculation unit 712 cause only the R color LED group 351 to emit light alone and calculate the characteristic of the R color LED group. During this step, the applied current values to the G color LED group 352 and the B color LED group 353 are maintained at the minimum value so that the LED groups 352 and 353 do not emit light.

FIG. 14 shows a processing procedure in ST21.
In ST2101, the shutter speed of the CCD camera 42 is set to the slowest and the exposure time is set to the maximum value (in this embodiment, 1 / 3.75 seconds).

  In ST2102, the applied current value Ir to the R color LED group 351 is set to the minimum value. Note that the subscript “r” refers to the R color LED group 351 (similarly, the subscript “g” refers to the G color LED group 352, and the subscript “b” represents the B color. Meaning the LED group 353).

  In ST2103, the calibration tool image data acquisition unit 7111 images the illuminance chromaticity calibration tool 6 illuminated by the R color LED group 351 to which the current Ir (initial value is the minimum value) is applied, by the CCD camera 42, and the calibration tool. Get image data.

In ST2104, the color region selection unit 7112 selects each color region corresponding to each color portion of RGB in the color pattern of the illuminance chromaticity calibration tool 6 in the calibration tool image data acquired in ST2103.
FIG. 15A shows a case where a color region corresponding to the R color portion in the color pattern is selected, and FIG. 15B shows a case where a color region corresponding to the G color portion in the color pattern is selected. FIG. 15C shows a case where a color region corresponding to the B color portion in the color pattern is selected. In each figure, each area surrounded by a plurality of rectangular frames is a selected color area. As will be described later, ST2104 is repeated three times in total until all three color regions are selected.

  In the memory 72, color pattern data in the illuminance chromaticity calibration tool 6 is stored in advance in a form associated with each imaging pixel of the CCD camera 42. Roughly speaking, it is determined which color portion of RGB in the color pattern each image pickup pixel of the CCD camera 42 picks up. In the memory 72, each image pickup pixel and the color portion (captured by the image pickup pixel) Any one of RGB). The color area selection unit 7112 selects a color area based on the data stored in the memory 72. Specifically, for example, when selecting the R color region, the color region selection unit 7112 selects an imaging pixel associated with the R color portion in the color pattern. At this time, since the illuminance chromaticity calibration tool 6 is accurately arranged in accordance with the mark provided on the stage 2, the illuminance chromaticity calibration tool 6 corresponds to the correspondence between the imaging pixel stored in the memory 72 and each color portion in the color pattern. It is possible to select a desired color region accurately.

  Here, when the size of each color region selected by the color region selection means 7112 is completely matched with the size of each color portion of RGB in the color pattern, the illuminance chromaticity calibration tool 6 is placed on the stage 2. When a slight error (positional deviation) occurs, a deviation occurs between the range of each color area to be selected and the range of each color part in the color pattern, and an accurate color area cannot be selected. Therefore, in the present embodiment, the size of each color region selected by the color region selection unit 7112 is set smaller than the size of each color portion in the color pattern. Thereby, even if a slight error occurs when the illuminance chromaticity calibration tool 6 is placed on the stage 2, the range of each color area selected by the color area selection unit 7112 is completely the range of each color part in the color pattern. It is supposed to be included. For this reason, since the selected color area includes only the imaging pixels that image the corresponding color portion in the color pattern, an accurate color area can be selected.

In ST2105, the color component intensity calculating unit 7113 corresponds to the selected color area, the average value of the output data of the imaging pixels included in the color area selected in ST2104 among the calibration tool image data acquired in ST2103. Calculated as the intensity of the color component.
When the R color area is selected in ST2104 (see FIG. 15A), the intensity Rr of the R color component is calculated, and the G color area is selected (see FIG. 15B). ), The intensity Gr of the G color component is calculated, and when the B color region is selected (see FIG. 15C), the intensity Br of the B color component is calculated.
The calculated intensities Rr, Gr, and Br of the color components for the R color LED group 351 are stored in the memory 72 in association with the exposure time and the applied current value Ir to the R color LED group 351 (ST2106). ).

  In ST2107, it is determined whether all (three) color regions have been selected. If all the color areas have not been selected (ST2107: NO), the process returns to ST2104, a new color area is selected, and the intensity of the color component corresponding to the color area is calculated (ST2105) and stored. (ST2106).

When the calculation and storage of the color component intensities Rr, Gr, Br for all three color regions is completed (ST2107: YES), it is determined in ST2108 whether the R color component intensity Rr is saturated. That is, it is determined whether or not the R color component intensity Rr calculated in ST2105 has reached the maximum value. For example, when the R color component intensity Rr is represented by 8 bits and can take a value of 0 to 255, it is determined whether or not the maximum value 255 has been reached.
Here, out of the three color component intensities Rr, Gr, and Br, it is determined whether or not only the R color component intensity Rr is saturated. In ST21 (ST2101) for calculating the characteristics of the R color LED group 351, As described above, only the R color LED group 351 emits light alone, and the R color component intensity Rr is always the maximum of the three color component intensities Rr, Gr, Br, so that the R color component intensity Rr is saturated. If it is understood that the G color component intensity Gr and the B color component intensity Br are not saturated, it is understood that the G color component intensity Gr and the B color component intensity Br are not saturated.
In ST22 for calculating the characteristics of the G color LED group 352 and ST23 for calculating the characteristics of the B color LED group 353, the same processing as ST2108 is performed, but in ST22, whether or not the G color component intensity Gg is saturated. In ST23, it is determined whether or not the B color component intensity Bb is saturated.

  In FIG. 14, when the R color component intensity Rr is not saturated (that is, the G color component intensity Gr and the B color component intensity Br are not saturated) (ST2108: NO), the process proceeds to the R color LED group 351. The applied current value Ir is incremented (ST2109), and ST2103 to ST2108 are repeated. That is, the exposure time of the CCD camera 42 is constant, and the applied current value Ir is gradually increased to sequentially acquire the color component intensities Rr, Gr, Br of the R color LED group 351. FIG. 16 is a graph showing the R component intensity Rr of the R color LED group 351 as an example. In FIG. 16A, for example, a curve L5 indicates the R color component intensity of the R color LED group 351 relative to the applied current value Ir to the R color LED group 351 when the exposure time is set to the maximum value (initial state). This represents the relationship of Rr.

  When it is determined in ST2108 that the R color component intensity Rr is saturated (YES), it is determined whether or not the applied current value Ir to the R color LED group 351 is the maximum value (ST2110). When the exposure time is long (for example, 1 / 3.75 seconds), the R color component intensity Rr reaches the maximum value before the applied current value Ir reaches the maximum value (curve in FIG. 16A). See L5). For this reason, in the region where the applied current value Ir is high, data representing the relationship between the applied current value Ir and the R color component intensity Rr cannot be acquired. Therefore, when the applied current value Ir to the R color LED group 351 does not reach the maximum value (ST2110: NO), the shutter speed of the CCD camera 42 is increased and the exposure time is shortened ( ST2111). ST2102 to ST2110 are repeated with the exposure time shortened in this way. In FIG. 16A, the exposure time decreases in the order of curves L5 → L4 →... → L1. When the exposure time is shortened in this way, the R color component intensity Rr can be obtained up to a high applied current value Ir (G color component intensity Gr and B color component intensity Br smaller than the R color component intensity Rr are naturally given). However, it can be seen that even a high applied current value Ir can be obtained). However, it should be noted that when the exposure time is shortened, the resolution of each color component intensity Rr, Gr, Br with respect to the applied current value Ir is lowered.

  As described above, the increment of the applied current value Ir to the R color LED group 351 and the reduction of the exposure time are performed, and the relationship between the applied current value Ir and the color component intensities Rr, Gr, Br for each exposure time. If it calculates | requires, the curve (L1-L5) for every exposure time as shown to FIG. 16 (A) about R color component intensity | strength Rr will be obtained. In FIG. 16A, only five typical curves are shown for simplicity. Here, in the curve L1 when the exposure time is the shortest in FIG. 16A, even when the applied current value Ir reaches the maximum value, the R color component intensity Rr does not reach the maximum value. The maximum value of the applied current value Ir is 4096 when the applied current value Ir is controlled using, for example, a 12-bit DA converter.

  As shown in FIG. 17, in the reference characteristic curve creating step ST2112, the maximum applied current for the curve having the shortest exposure time among the plurality of curves included in the data as shown in FIG. Each color component intensity Rr, Gr, Br in terms of value is set to 100%, and each color component intensity Rr, Gr, Br is converted into% value data. In the data of FIG. 16A, the curve R1 when the exposure time is the shortest is converted with the maximum R color component intensity Rr being 100%, and the characteristic curve L1 ′ of FIG. 16B is obtained.

  Here, although the color component intensities Rr, Gr, and Br with respect to the applied current value Ir differ depending on the exposure time, the applied current Ir is the same as the illuminance and chromaticity of the light emitted from the R color LED group 351. If it is the same. Therefore, when the color component intensity data measured for each exposure time is converted into a% value, the scale of the color component intensity data for each exposure time so as to show the same% value for the same applied current value Ir. Is converted, all the color component intensity data should be on a single characteristic curve. That is, the color component intensity data (L1 in FIG. 16A) when the exposure time is the shortest is used as a reference scale (reference scale), and the other color component intensity data is placed on the reference characteristic curve with the shortest exposure time. Convert to put it on.

  In the color component intensity data conversion step ST2113, first, a conversion formula for placing the color component intensity data when the exposure time is short next on the reference characteristic curve is determined from the color component intensity data when the exposure time is the shortest. . A description will be given by taking FIG. 16 as an example. FIG. 16A shows an R color component intensity curve L1 when the exposure time is the shortest, and an R color component intensity curve L2 when the exposure time is next short. Here, the point on the R color component intensity curve L2 is expressed as (R color component intensity Rr, applied current value Ir) = (y2, x1). FIG. 16B shows a characteristic curve after the R color component intensity Rr is converted to a% value, and a reference characteristic curve when the exposure time is the shortest is indicated by L1 '. A graph obtained by converting the R color component intensity Rr of the R color component intensity curve L2 into a% value is a characteristic curve L2 '. A point on L2 ′ is represented by (relative intensity, applied current value Ir) = (y2 ′, x1).

  Here, the relative intensities for the same applied current value Ir should be equal. Thus, L2 'should overlap L1'. Therefore, a conversion equation for converting L2 to L2 'is determined as in the following equation (1) using parameters a and b.

  y2 '= a.y2 + b (1)

  Then, the parameters a and b of the conversion formula (1) can be determined from the least square method. That is,

S (a, b) = Σ (y1′−y2 ′) ² = Σ (y1′−a · y2−b) ²

  When the set of parameters (a, b) that minimizes S (a, b) is determined, the conversion formula (1) can be determined.

  The conversion formula is obtained as described above, and the color component intensity is converted into a% value. This operation is performed for all color component intensity data for each exposure time (ST2114).

  Subsequently, effective values are extracted and data are pasted together to create a single characteristic curve (ST2115). Here, it was possible to convert the color component intensity data for each exposure time to a% value and place it on a single curve. However, the longer the exposure time, the higher the gradation of the color component intensity, and the measurement accuracy. Is expensive. Therefore, a characteristic curve with higher accuracy can be created by using color component intensity data having a longer exposure time. For example, in FIG. 16A, for the region S1, the point on the R color component intensity curve L1 when the exposure time is the shortest is used for creating the characteristic curve, but for the region S2, the exposure time is longer. If the point on L2, which is the R color component intensity curve, is used to create the characteristic curve, the characteristic curve is created using the color component intensity data with the highest gradation accuracy in each region S1, S2,. can do.

  In this way, a characteristic curve is created using the color component intensity data acquired with the longest exposure time for the same applied current value Ir as effective values. Then, a temporary characteristic curve as shown in FIG. 18A can be obtained.

  Subsequently, the light receiving characteristic correction step ST2117 will be described. In the light receiving characteristic correction step ST2117, a light receiving characteristic estimating step ST2118 for estimating the light receiving characteristic of the CCD camera 42 and a color for correcting the color component intensity data in consideration of the light receiving characteristic of the CCD camera 42 estimated in the light receiving characteristic estimating step ST2118. And a component intensity data correction step ST2119.

  Looking at the provisional characteristic curve in FIG. 18A, it can be seen that when valid values are pasted together, not all numerical values are on one curve, resulting in a pasting error. This is due to the light receiving characteristics of the CCD camera 42. In general, the light receiving sensitivity, that is, the conversion rate of charges with respect to light, is low where the amount of light is large. That is, when the color component intensity data is acquired by changing the exposure time of the CCD camera 42, the color component intensity data obtained at a place where the amount of light is large becomes lower than the actual color component intensity. When the color component intensity curves with different exposure times are pasted together, the color component intensity of the curve with a long exposure time (a large amount of light) becomes smaller at the pasted portion, and both curves are completely It cannot be glued smoothly.

  In the temporary characteristic curve of FIG. 18A, when the color component intensity curves having different exposure times are bonded together, the bonding error increases for each bonded portion. The characteristics of the charge conversion rate of the camera 42 can be obtained. When the ideal charge conversion rate of the CCD camera 42 is 1, the light receiving characteristic of the CCD camera 42 obtained from the pasting error of the temporary characteristic curve of FIG. 18A is as shown in FIG. It can be seen that the light receiving characteristics are low where the output intensity of the CCD is high, that is, where the amount of light is large.

  Therefore, in the light reception characteristic estimation step ST2118, in the characteristic curves L1 ′ to L5 ′ when the color component intensity is converted into the relative intensity by the data conversion equation (1), the exposure time is long and the exposure time is one step shorter. The charge conversion rate of the CCD camera 42 is calculated from the relative intensity shift δ when comparing. Further, in the color component intensity data correction step ST2119, the color component intensity data is corrected so that the charge conversion rate is constant with respect to the output intensity of the CCD, that is, “1” in the present embodiment. This correction is performed on the color component intensity data for each exposure time.

  Subsequently, a temporary characteristic curve is obtained again based on the color component intensity data corrected in the color component intensity data correction step ST2119 (ST2112 to ST2115). As shown in FIG. 19, when the temporary characteristic curve converges to one (ST2116: YES), this characteristic curve is stored in the memory 72 (ST2120). FIG. 19 shows data about the R color component intensity Rr of the R color LED group 351. In addition to the data about the R color component intensity Rr, the memory 72 stores the G color component of the R color LED group 351. Data on the intensity Gr and data on the B color component intensity Br are also stored.

  In this way, a total of three characteristic curves as shown in FIG. 19 are stored in the memory 72 for each of the RGB color component intensities Rr, Gr, Br of the R color LED group 351 through ST2120. Hereinafter, for simplification of description, these three characteristic curves are referred to as an Rr characteristic curve (FIG. 19), a Gr characteristic curve, and a Br characteristic curve.

  In ST2121, the LED characteristic calculation unit 712 determines the characteristics of the R color LED group 351 based on the Rr characteristic curve, the Gr characteristic curve, and the Br characteristic curve, that is, the illuminance Er and chromaticity of the R color LED group 351 with respect to the applied current Ir. Change characteristics of xr and yr are calculated. Specifically, Er, xr, and yr are calculated for each value of the applied current Ir in accordance with the following known equation (2).

  The values of Er, xr, and yr for each value of Ir calculated for the R color LED group 351 are stored in the memory 72 as a table as shown in FIG.

  When the characteristics of the R color LED group 351 are calculated and stored in the memory 72 through ST21 (FIG. 13) configured by the above steps ST2101 to ST2121, the G color LED group 352 and the B color LED group are subsequently obtained. The same processing as ST21 is performed for 353 (ST22 and ST23). As a result, a table storing the characteristic data of each color LED group 351, 352, 353 as shown in FIG. 20 is created and stored in the memory 72.

  Subsequently, for each color LED group 351, 352, 353, an average value of chromaticity is obtained for each group (ST24). That is, for each color LED group 351, 352, 353, a value obtained by averaging the chromaticity calculated for each applied current value is obtained. The average value of chromaticity of each color LED group 351, 352, 353 is shown in the bottom column of FIG.

  Subsequently, a representative mixture ratio is obtained (ST25). The representative mixing ratio is to generate combined light of desired chromaticity inputted by the input means 73 when the emission chromaticity of each color LED group 351, 352, 353 is the average chromaticity calculated in ST24. Therefore, the emission intensity ratio of the LED groups 351, 352, and 353 for the respective colors. In the present embodiment, for the sake of simplicity of explanation, a case where the desired chromaticity is expressed by CIE1931 chromaticity coordinates (0.3, 0.3) is taken as an example. Of course, the desired illuminance is not limited to this, and the user can freely set it appropriately. The light having CIE 1931 chromaticity coordinates (0.3, 0.3) is white light.

  Here, a color synthesis theory for obtaining a mixing ratio for synthesizing an arbitrary synthesized color (x, y, E) will be described (x, y are chromaticity, and E is illuminance). R color illumination light (xr, yr, Er) from the R color LED group 351, G color illumination light (xg, yg, Eg) from the G color LED group 352, B color illumination light from the B color LED group 353 ( The combined light (x, y, E) of xb, yb, Eb) is expressed by the following equation (3).

  Solving for Tr, Tg, and Tb from equation (3) yields the following equation (4).

  Accordingly, the intensities Er, Eg, Eb of the respective color LED groups 351, 352, 353 for synthesizing the synthesized color (x, y, E) are expressed by the following equation (5).

  From the ratios of the intensities Er, Eg, and Eb of the LED groups 351, 352, and 353 thus obtained, a mixing ratio (Pr, Pg, Pb) for synthesizing the desired chromaticity (x, y) of the combined illumination is obtained ( However, Pr + Pg + Pb = 1).

  In order to obtain the representative mixing ratio according to the color synthesis theory as described above (ST25), the average chromaticity of the R color LED group 351 (lower column in FIG. 20) <xr>, <yr> (<> represents an average. The same applies hereinafter), the average chromaticity <xg>, <yg> of the G-color LED group 352, and the average chromaticity <xb>, <yb> of the B-color LED group 353 are substituted into the above equation (5), respectively. A representative mixing ratio (<Pr>, <Pg>, <Pb>) for synthesizing the synthesized color of the CIE 1931 chromaticity coordinates (0.3, 0.3) is calculated.

When the above process ST2 (FIG. 11) is completed, the instruction value / current value temporary table creation process ST3 is subsequently performed.
As shown in FIG. 21, ST3 includes a mixture ratio calculation step ST33 for calculating a mixture ratio for generating the combined illumination (0.3, 0.3, Ei) and a mixture ratio calculated in the mixture ratio calculation step ST33. Illuminance calculation step ST34 for calculating the illuminance (Eri, Egi, Ebi) of each LED group 351, 352, 353 from the LED, and the applied current for causing each color LED 351, 352, 353 to emit light with the illuminance calculated in the illuminance calculation step ST34 A current value reading step (corresponding to an input signal reading step in the present invention) ST35 for reading a value.

  In ST3, first, the illuminance Ei for the instruction value i [%] is read from the instruction value / illuminance table (FIG. 12B) (ST32). At this time, the counter i of the instruction value i is initially set to 0 (ST31). When ST32 to ST35 are completed, the counter i is incremented by 1 (ST38), and ST32 to ST35 are performed for all the instruction values i (ST36).

The mixing ratio calculation step (ST33) will be described.
As shown in FIG. 22, the mixing ratio calculation step ST33 includes a first temporary mixing ratio setting step ST331 that sets a temporary mixing ratio of the emission intensity of each color LED group 351, 352, 353 as the first temporary mixing ratio. The provisional illuminance calculation step ST332 for obtaining the respective illuminances of the LED groups 351, 352, and 353 necessary for generating the indicated illuminance of the combined illumination under the first temporary mixing ratio, and the provisional illuminance calculation step ST332 The chromaticity reading step ST333 for reading the chromaticity of each color LED group 351, 352, 353 at the illuminance of each of the color LED groups 351, 352, 353, and the desired color of the composite illumination with the chromaticity read in the chromaticity reading step ST333 Second temporary mixing ratio calculating step ST334 for calculating the mixing ratio of the emission intensity of each color LED group 351, 352, 353 necessary for generating the degree as the second temporary mixing ratio The temporary mixing ratio comparison step ST335 for comparing the first temporary mixing ratio and the second temporary mixing ratio, and the second temporary mixing ratio as the first temporary mixing ratio according to the comparison result in the temporary mixing ratio comparison step ST335. And provisional mixing ratio resetting step ST338 for resetting.

  In the first temporary mixing ratio setting step ST331, first, the first temporary mixing ratio (Pri, Pgi, Pbi), which is the emission intensity ratio of the LED groups 351, 352, 353, is represented by the representative mixing ratio (< Pr>, <Pg>, <Pb>).

  In the temporary illuminance calculation step ST332, the illuminances (Eri, Egi, Ebi) of the respective color LED groups 351, 352, 353 necessary for generating the combined illumination instruction illuminance Ei with the first temporary mixing ratio are expressed by the following equation (6). Calculate according to

Eri = Pri · Ei
Egi = Pgi · Ei (6)
Ebi = Pbi · Ei

  Here, the first temporary mixing ratio (Pri, Pgi, Pbi) is set to the representative mixing ratio (<Pr>, <Pg>, <Pb>) (ST331). The representative mixing ratio is based on the CIE1931 chromaticity coordinates (0.3, 0) when it is assumed that the light emission chromaticity of each color LED group 351, 352, 353 is always the average chromaticity regardless of the light emission intensity (illuminance). .3) is typically set as the mixing ratio for generating the combined light. Therefore, when each color LED group 351, 352, 353 emits light with the illuminance (Eri, Egi, Ebi) calculated by Equation (6), the illuminance becomes Ei as instructed, but the chromaticity is actually Since the light emission chromaticity changes according to the light emission intensity, the CIE 1931 chromaticity coordinates (0.3, 0.3) as instructed may not be achieved.

In the chromaticity reading step ST333, the chromaticity when each color LED group 351, 352, 353 emits light with the illuminance (Eri, Egi, Ebi) calculated in the temporary illuminance calculation step ST332 is read. This reads out the chromaticity with respect to the illuminance from the table (FIG. 20) of the applied current value and the illuminance / chromaticity previously created in ST2. Specifically, the chromaticity (xri, yri) corresponding to the illuminance Eri of the R color LED group 351, the chromaticity (xgi, ygi) corresponding to the illuminance Egi of the G color LED group 352, and the illuminance of the B color LED group 353 The chromaticity (xbi, ybi) corresponding to Ebi is read from the table of FIG.
Here, when the read chromaticity is deviated from the average chromaticity, the mixing ratio for synthesizing the chromaticity (0.3, 0.3) of the composite color with the read chromaticity. Note that is deviated from the first temporary mixing ratio (representative mixing ratio at this stage).

  The second temporary mixing ratio calculation step ST334 generates the indicated chromaticity of the composite illumination, that is, CIE1931 chromaticity coordinates (0.3, 0.3) with the chromaticity read out in the chromaticity reading step ST333. Is calculated as a second temporary mixing ratio (P′ri, P′gi, P′bi) based on color synthesis theory. According to the above equation (5), the emission intensity of each LED group 351, 352, 353 necessary to generate the chromaticity (x, y) = (0.3, 0.3) of the combined illumination, ie, ( Er, Eg, Eb). The second provisional mixing ratio (P′ri, P′gi, P′bi) is obtained as the ratio of (Er, Eg, Eb) obtained here.

The temporary mixing ratio comparison step ST335 compares the first temporary mixing ratio with the second temporary mixing ratio. Each component of the first temporary mixing ratio and each component of the second temporary mixing ratio are compared and compared for each component.
Here, in the color synthesis theory, the calculation is performed based on the chromaticity when light is emitted with the illuminance by the first temporary mixing ratio to calculate the second temporary mixing ratio, and the chromaticity is nonlinear according to the illuminance. Therefore, even when the synthesized illumination is synthesized with the second provisional mixing ratio, it is possible that the synthesized illumination of the CIE 1931 chromaticity coordinates (0.3, 0.3) cannot be generated. Therefore, in ST338, repeated convergence processing is performed to reset the second temporary mixing ratio as the first temporary mixing ratio, and the degree of convergence is determined in the temporary mixing ratio comparison step ST335.

  In the temporary mixing ratio comparison step ST335, the difference between each component of the first temporary mixing ratio (Pri, Pgi, Pbi) and the second temporary mixing ratio (P′ri, P′gi, P′bi) is determined by a predetermined amount ε. Compare with And when the difference for every component is less than predetermined amount (epsilon) (ST336: YES), ie, when the following relational expression (7) is satisfy | filled, a 2nd temporary mixing ratio is set as a mixing ratio with respect to the instruction | indication value i. Here, the predetermined amount ε is a difference between the first temporary mixing ratio and the second temporary mixing ratio so that the change in chromaticity with the change in illuminance falls within an allowable range.

| Pri−P′ri | <ε
| Pgi−P′gi | <ε (7)
| Pbi−P′bi | <ε

  Further, when the relationship of Expression (7) is not satisfied (ST336: NO), the second temporary mixing ratio is reset as the first temporary mixing ratio (ST338), and the first temporary mixing ratio and the second temporary mixing are set. ST 332 to ST 335 are repeated until the ratio converges to satisfy equation (7).

  Next, in the illuminance calculation step (FIG. 9, ST34), the illuminance (Eri,) of each color LED group 351, 352, 353 for generating the indicated illuminance Ei of the combined illumination based on the mixing ratio obtained in ST33. Egi, Ebi). This is determined according to equation (6). In the current value reading step ST35, the applied current value reading means 713 reads the applied current value for causing each color LED group 351, 352, 353 to emit light with the illuminance calculated in the illuminance calculating step ST34 from the table of FIG. Are stored in the memory 72 as current values applied to the LED groups 351, 352, and 353. Then, after performing ST32 to ST35 for all indicated values i, that is, for all counters i in the effective range (ST36: YES), to each color LED group 351, 352, 353 for the indicated value i. The applied current value is used as a table to obtain a temporary value / current value table (ST37).

Subsequently, a verification process for verifying the instruction value / current value temporary table is performed (ST4: FIG. 11). Specifically, current is applied to each color LED group 351, 352, 353 according to the indication value / current value provisional table to emit light, and the chromaticity of the combined illumination light is CIE1931 chromaticity coordinates (0.3, 0.3). ) Is verified.
As shown in FIG. 23, the verification process ST4 includes a verification measurement process ST41 that measures the chromaticity of the combined illumination light, a verification comparison process ST42 that compares the measured chromaticity with the target indicated chromaticity, A chromaticity correction amount storage step ST43 that stores a difference between the chromaticity measured from the comparison result of the verification comparison step ST42 and the target instruction chromaticity as a chromaticity correction amount.

In the verification measurement step ST41, current is applied to the LED groups 351, 352, and 353 to emit light according to the instruction value / current value temporary table created in ST37, thereby generating combined illumination light. In this case, the illuminance of the combined illumination light may be arbitrary, and an appropriate instruction value i may be indicated to generate the combined illumination light. Then, the chromaticity (xi, yi) of the combined illumination light is measured.
Here, the indicated value / current value temporary table is created in order to change the chromaticity of the combined illumination light to CIE1931 chromaticity coordinates (0.3, 0.3) based on the calculation based on the color synthesis theory. However, even when the chromaticity of the target combined illumination light is set to CIE 1931 chromaticity coordinates (0.3, 0.3) and the color synthesis theory is applied, There may be a difference between the chromaticity of the illumination lights actually synthesized (see FIG. 24).

  In the verification comparison step ST42, the measured chromaticity (xi, yi) and the target chromaticity (0.3, 0.3) are compared with a predetermined allowable amount α for each component. If the difference for each component is less than the predetermined amount α (ST42: YES), that is, if the following relational expression (8) is satisfied, the combined illumination light generated according to the indicated value / current value temporary table is allowed. Within the range, the verification result O.D. K. (ST45). Here, the predetermined amount α is a color difference that does not affect the measurement when an image of the object to be measured is measured.

| Xi-0.3 | <α
| Yi-0.3 | <α (8)

  The verification result is O.D. K. (ST45), the instruction value / current value temporary table is stored as a formal instruction value / current value table (instruction value / current value table storage step, FIG. 11, ST6).

On the other hand, if the relational expression (8) is not satisfied, the difference for each component is stored as the chromaticity correction amount (ST43). That is, the chromaticity correction amount (Cx, Cy) is expressed by the following equation (9).
Cx = 0.3-xi
Cy = 0.3-yi (9)
The chromaticity correction amount is the difference between the chromaticity targeted by the color synthesis theory and the chromaticity of the synthesized illumination light actually generated. If it is shifted by the amount, the chromaticity of the composite color that is actually turned on is considered to match the target value.

After storing the chromaticity correction amount, the instruction value / current value temporary table is corrected (FIG. 11, ST7).
The correction of the instruction value / current value temporary table is shown in the flowchart of FIG. As shown in FIG. 25, the correction process ST7 is basically the same as the instruction value / current value temporary table creation process ST3, and FIG. 25 corresponds to the combination of FIG. 21 and FIG. Yes.
In the correction step ST7, when calculating the second temporary mixing ratio by the color synthesis theory in ST77, the chromaticity (0.3 + Cx, 0) taking into account the chromaticity correction amount (Cx, Cy) read out immediately before (ST76). .3 + Cy) as the target chromaticity. In this way, by taking into account the deviation between the color synthesis theory and the actual chromaticity correction amount in advance, the chromaticity of the actually generated synthesized color can be set as the target chromaticity (see FIG. 26). ).

  The corrected instruction value / current value temporary table is verified again (FIG. 11, ST4), and if the verification result is good (ST5: YES), it is stored in the memory 72 as a formal instruction value / current value table (ST6). ).

  As shown in FIG. 27, the indication value / current value table indicates that the R color LED group 351, G corresponds to the illuminance indication value (the chromaticity indication value is fixed at (0.3, 0.3)). 6 is a table in which applied current values to be applied to each color LED group of the color LED group 352 and the B color LED group 353 are recorded. The current applying unit 714 reads out the applied current value to each color LED group 351, 352, 353 corresponding to the illuminance instruction value input by the input unit 73 from the instruction value / current value table and applies it. At this time, the combined illumination light of the light emitted from the LED groups 351, 352, and 353 at this time is desired illumination light having the indicated illuminance and the indicated chromaticity.

<Effect of embodiment>
According to the above embodiment, the following effects can be obtained.
Using the illuminance chromaticity calibration tool 6 and the monochrome CCD camera 42, a characteristic table (FIG. 20) regarding the illuminance and chromaticity of each color LED group 351, 352, 353 can be created. Since it is not necessary to use an expensive color illuminometer for directly measuring the illumination device 3, the illumination device 3 can be calibrated at low cost.

  In particular, the illumination device 3 can be calibrated by using the monochrome CCD camera 42 originally provided in the image measuring device 1, and it is not necessary to separately provide an imaging means for illuminating device calibration. The apparatus 3 can be calibrated.

  Moreover, since the CCD camera 42 can capture images at a frame rate of several tens of frames per second, the measurement speed is faster than, for example, an illuminometer. The CCD camera 42 is less expensive than the illuminometer. Therefore, calibration of the lighting device 3 can be performed quickly and inexpensively.

  In addition, since the RGB color spectral samples for extracting the RGB color components from the individual emitted lights of the LED groups 351, 352, 353 are formed in the single illuminance chromaticity calibration tool 6, each illumination At the time of calibration of the devices 31, 32, 33, the illuminance chromaticity calibration tool 6 corresponding to the illumination device to be calibrated may be placed on the stage 2, and it is not necessary to switch during the calibration operation of the illumination device thereafter. Therefore, the calibration work can be made efficient.

Further, by periodically arranging spectral characteristic samples of each color of RGB in the illuminance chromaticity calibration tool 6 (as shown in FIG. 5, a large number of rectangular sample units are arranged in a matrix), The generation conditions of the RGB color components generated via the spectral characteristic sample can be made uniform, and the calibration accuracy of the illumination device 3 can be improved.
Contrary to this embodiment, when the spectral characteristic samples of each color of RGB in the illuminance chromaticity calibration tool 6 are arranged in one place (for example, the illuminance chromaticity calibration tool 6 is divided into three equal parts, In the case where spectral characteristics samples of RGB colors are arranged in the respective areas), if the illumination device 3 has uneven illuminance, for example, the illuminance increases in the R spectral characteristic sample portion, and in the G spectral characteristic sample portion. As the illuminance decreases, the difference in illuminance between each spectral characteristic sample part is likely to occur, and the effect of uneven illuminance is not evenly applied to each spectral characteristic sample, resulting in each spectral characteristic sample being generated There is a risk that the generation conditions of the respective RGB color components are shifted, leading to deterioration in calibration accuracy.
On the other hand, in the present embodiment, the spectral characteristic samples for each color of RGB are periodically arranged, so even if the illumination device has uneven illuminance, the influence of the uneven illuminance is substantially reduced for each spectral characteristic sample. Since it extends evenly, the illumination apparatus 3 can be calibrated with high accuracy without being affected by unevenness in illuminance. In particular, if the size of a large number of rectangular sample units constituting each spectral characteristic sample is reduced, the influence of uneven illuminance can be further reduced, and the calibration accuracy of the illumination device 3 can be further improved. .

  Since illumination intensity chromaticity calibration tools 61, 62, and 63 suitable for calibration of each of the epi-illumination device 31, the ring illumination device 32, and the transmission illumination device 33 are provided, the calibration of each of the illumination devices 31, 32, and 33 is performed. It can be performed with high accuracy.

  According to the calibration method using the color illuminance meter described in Patent Literature 1, when calibrating the illumination device for the image processing apparatus provided with the imaging means, the illumination light from each color LED in the illumination device is directly measured with the color illuminance meter. The lighting device is calibrated based on the acquired illuminance data and chromaticity data. However, the imaging means is not used in this calibration work, and characteristics such as sensitivity of the imaging means are not taken into consideration. However, since imaging by the imaging unit is always performed when the image processing apparatus is used, it is preferable to calibrate the lighting device in consideration of the characteristics of the imaging unit in order to improve the accuracy of the image processing. In this respect, in the present embodiment, the emitted light from each color LED group 351, 352, 353 is imaged by the CCD camera 42 via the illuminance chromaticity calibration tool 6, and the illumination device 3 is calibrated based on this image data. Therefore, calibration is performed in such a manner that characteristics such as sensitivity of the CCD camera 42 are automatically taken into account. Therefore, according to the present embodiment, the image processing accuracy (image measurement accuracy) of the image processing device (image measurement device 1) can be improved.

  Further, in the mixing ratio calculation step ST33, the second temporary mixing ratio for generating the predetermined chromaticity calculated by the color synthesis theory in consideration of the chromaticity changing according to the illuminance is the first temporary mixing ratio. The calculation is repeated until the first temporary mixing ratio and the second temporary mixing ratio converge. Therefore, the mixing ratio for synthesizing illumination with a predetermined chromaticity can be accurately obtained.

  In addition, the average chromaticity for each of the LED groups 351, 352, and 353 is calculated, and a representative mixture ratio for generating a composite color having a predetermined chromaticity is calculated based on the average chromaticity. Then, starting from this representative mixing ratio, the mixing ratio calculating step is calculated. As a result, the mixture ratio can be calculated quickly by reducing the number of repetitions of the calculation in the mixture ratio calculating step ST33.

  Further, in the verification process ST4, the instruction value / current value temporary table obtained based on the color synthesis theory is verified. At this time, if the chromaticity of the actually generated combined illumination light deviates from the predetermined chromaticity, the amount of deviation is set as the chromaticity correction amount. Then, the target value in the color synthesis theory is shifted by the chromaticity correction amount, and the mixture ratio is calculated and corrected. Therefore, it is possible to correct the deviation between the theory and the actual, and to accurately generate the synthesized illumination light having a predetermined chromaticity.

  In addition, since the applied current value corresponding to the instruction value is stored in the memory 72 as an instruction value / current value table, when the instruction value is instructed by the input means 73, the instruction value is determined from the instruction value / current value table. It is only necessary to read out the current value corresponding to, and the response to the change of the indicated value can be made quick.

  Further, by changing the exposure time of the CCD camera 42, the relationship between the applied current value and the intensity of illumination light is obtained for each exposure time. By shortening the exposure time of the CCD camera 42, the resolution of the light intensity data is low, but the relationship between the applied current value and the illumination light intensity can be obtained in a wide range. Further, when the exposure time is lengthened, the relationship between the applied current value and the illumination light intensity can be obtained with high resolution, although it is in a narrow range. By extracting effective numerical values as appropriate from the data acquired in this way, it is possible to obtain the relationship between the applied current value and the illumination light intensity in a wide range and with a high resolution of the illumination light intensity.

  Further, the CCD camera 42 has a characteristic such that the photoelectric conversion rate changes when the amount of light is large. The characteristic of the CCD camera 42 is estimated (ST2118), and the color component intensity data is corrected based on this estimation result (ST2118). ST2119). Therefore, even if the CCD camera 42 is not as accurate as the illuminometer, accurate calibration can be performed.

<Modification>
The present invention is not limited to the embodiment described above, and any modification of this embodiment within the scope that can achieve the object of the present invention is included in the technical scope of the present invention.

  For example, in the above embodiment, the calibration of the illumination device 3 including the RGB color LED groups 351, 352, and 353 that can emit RGB light as a plurality of color light sources has been described. Is not limited to RGB. For example, it may be orange or yellow. In short, the plurality (two or more) of color light sources may be anything as long as they can emit light of different colors. In the case of calibrating an illumination device having such a color light source, if the illuminance chromaticity calibration tool 6 having the RGB color patterns used in the embodiment is used, the equation (2) holds as it is. The RGB color components (R, G, B) of the emitted light of each color light source are converted into (X, Y, Z) and further (E, x, y) by the conversion matrix described in the equation (2). can do.

  In the above embodiment, the illumination device 3 is calibrated using the RGB color patterns of the illuminance chromaticity calibration tool 6 as the spectral characteristic sample in the present invention. The characteristics) are not limited to RGB colors, and the illumination apparatus 3 can be calibrated by preparing spectral characteristic samples of three or more different colors. For example, spectral characteristic samples of three colors of cyan, magenta, and yellow may be used. In this case, the equation (2) for converting the RGB color components (R, G, B) of each color light source into (X, Y, Z) does not hold, but each component of the conversion matrix in the equation (2) is a color. If it is changed based on the conversion theory, an expression for converting each color component of cyan, magenta, and yellow of each color light source into (X, Y, Z) can be created. Calibration can be performed.

  In the above embodiment, the three illuminance chromaticity calibration tools 6 are integrally provided with the three spectral characteristic samples of each color of RGB, but they may be configured separately from each other. In this case, for example, R, G, and B color spectral characteristics samples are sequentially switched and arranged at the illumination position of the illuminating device 3, and are sequentially illuminated independently by the color light source in the illuminating device 3, and light sequentially generated through the spectral characteristic samples. That is, intensity data (see FIG. 16) of RGB color components included in the light emitted from the color light source may be sequentially acquired. As the spectral characteristic sample, for example, a color filter with a known spectral transmittance or a color chart with a known spectral reflectance can be used.

  Moreover, although the said embodiment demonstrated calibration of the illuminating device 3 provided in the image measuring device 1, if it is an illuminating device provided with the several color light source which can radiate | emit the light of a mutually different color, according to this invention. Can be calibrated. In this case, light intensity information may be acquired by using an illuminometer or the like instead of the monochrome CCD camera 42 provided in the image measuring apparatus 1.

  In the embodiment, the example in which the applied current value is obtained in advance for all the instruction values and the instruction value / current value table is created and stored in the memory 72 has been described. Even if not, the calibration process may be sequentially performed at the stage where the instruction value is instructed.

  In the above-described embodiment, the example in which the verification process ST4 is performed after the instruction value / current value table is created has been described. However, after obtaining the applied current value for one arbitrary instruction value, the verification is performed immediately to obtain the color The instruction value / current value table may be created by calculating the degree correction amount and taking this chromaticity correction amount into consideration. Alternatively, when the chromaticity correction amount is known in advance for each of the lighting devices 31, 32, 33, the calculated value is calculated by applying the color synthesis theory with the chromaticity correction amount taken into account from the beginning. A table may be created.

  In the above-described embodiment, the case where the CIE 1931 chromaticity coordinates (0.3, 0.3) are used as the predetermined chromaticity has been described, but the target predetermined chromaticity is of course arbitrary. If an instruction value / current value table is created for each chromaticity of a plurality of chromaticities, combined illumination light having a plurality of chromaticities can be generated with instructed illuminance.

  In the color component intensity data conversion step ST2113, the conversion formula is obtained by using the least square method. However, the method is not limited to this, and in short, the color component intensity data for all exposure times is converted into one characteristic curve. You just need to convert it to place it on For example, regression lines may be obtained for the color component intensity curves at each exposure time, and the slopes of all regression lines may be converted to the same.

  In the above-described embodiment, for example, in ST21 for calculating the characteristics of the R color LED group 351, if the exposure time is long, the R color component intensity Rr is saturated. The curve for Rr obtained for each exposure time as shown in FIG. 16A was bonded, and the curve was also bonded for Gr and Br. . However, in ST21 in which only the R-color LED group 351 is caused to emit light alone, Gr and Br are smaller than Rr, and there is a high possibility that it is not saturated even when Rr is saturated. In particular, even when the exposure time is the maximum (1 / 3.75 seconds), if Gr and Br are not saturated for all the values of the applied current Ir, “minimum” in FIG. Similar to the curve L1 obtained for the exposure time, a curve covering the entire range from the minimum value to the maximum value of the applied current Ir is obtained for the "maximum" exposure time for Gr and Br. When the exposure time is the maximum, the resolution of the color component intensity (here, in particular, Gr, Br) is the highest, so that the highest resolution can be achieved by using the curve obtained here as it is. Bonding of the curves, which had to be performed for Rr that saturates when time is long, is not necessarily performed for Gr and Br. Similarly, in ST22 for calculating the characteristics of the G color LED group 352, it is not always necessary to paste curves for Rg and Bg. In ST23 for calculating the characteristics of the B color LED group 353, the curves of Rb and Gb are not changed. It is not always necessary to perform bonding.

In addition, a calibration program for causing a computer to execute the calibration method for the illumination device described in the above embodiment is also included in the technical scope of the present invention.
A recording medium storing the calibration program is also included in the technical scope of the present invention.

  The present invention can be used for calibration of an illumination device having a plurality of color light sources (for example, LEDs).

It is a figure which shows an image measuring apparatus. It is a block diagram which shows the illuminating device, illumination control apparatus, and calibration apparatus in an image measuring device. It is a perspective view which shows the external appearance of an illumination intensity chromaticity calibration tool. It is sectional drawing which shows the illumination intensity chromaticity calibration tool for epi-illumination devices. It is a top view which shows the color pattern in an illumination intensity chromaticity calibration tool. It is sectional drawing which shows the illumination intensity chromaticity calibration tool for epi-illumination devices. It is sectional drawing which shows the illumination intensity chromaticity calibration tool for ring illumination apparatuses. It is sectional drawing which shows the illumination intensity chromaticity calibration tool for transmission illumination apparatuses. It is a figure which shows the mode at the time of calibration of a ring illuminating device. It is a figure which shows the mode at the time of calibration of a transmission illuminating device. It is a flowchart which shows the process sequence in the calibration method of an illuminating device. It is a figure which shows the relationship between an instruction | indication value and illumination intensity. It is a flowchart which shows the process sequence in a LED characteristic calculation process. It is a flowchart which shows the process sequence for calculating the characteristic of the R color LED group with respect to an electric current value. It is a top view which shows the mode of selection of a color area | region. It is a graph which shows R color component intensity | strength with respect to an applied electric current value. It is a flowchart which shows the process sequence for calculating the characteristic of the R color LED group with respect to an electric current value. It is a graph which shows the temporary characteristic curve acquired about R color LED group, and the light reception characteristic curve of a CCD camera. It is a graph which shows the characteristic curve acquired about R color LED group. It is a table showing the relationship of the illumination intensity and chromaticity with respect to an applied electric current value about each LED group. It is a flowchart which shows the process sequence in an instruction value / current value temporary table preparation process. It is a flowchart which shows the process sequence in a mixture ratio calculation process. It is a flowchart which shows the process sequence in a verification process. It is a graph which shows the chromaticity calculated theoretically, and the chromaticity of the illumination light synthesized | combined actually. It is a flowchart which shows the process sequence in a correction process. It is a graph which shows the chromaticity calculated theoretically and the chromaticity of the illumination light actually synthesized after chromaticity correction. It is an instruction value / current value table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image measuring device 2 ... Stage 3 ... Illuminating device 4 ... Imaging means 5 ... Image measuring means 6 ... Illuminance chromaticity calibration tool 7 ... Calibration device 31 ... Epi-illumination device 32 ... Ring illumination device 33 ... Transmission illumination device 34 ... Illumination Control device 42 ... monochrome CCD camera 71 ... control unit 72 ... memory 73 ... input means 351 ... R color LED group 352 ... G color LED group 353 ... B color LED group 711 ... color component intensity acquisition means 712 ... LED characteristic calculation means 713 ... Applied current value reading means 714 ... Current applying means 7111 ... Calibration tool image data obtaining means 7112 ... Color region selecting means 7113 ... Color component intensity calculating means

Claims (9)

A plurality of color light sources capable of emitting light of different colors, and input signal control means for individually controlling each input signal for causing each color light source to emit each color light, and input by the input signal control means A calibration method for an illuminating device that performs illumination with combined light of each color light emitted from each color light source under signal control,
Prepare at least three spectral characteristic samples having predetermined spectral characteristics different from each other, and sequentially emit each color light to each color light source while changing the input signal value to each color light source by the input signal control means. Illuminate the spectral characteristic sample, and obtain intensity information (hereinafter referred to as sample intensity information) of the light generated through each spectral characteristic sample for each combination of the individual color light source and the individual spectral characteristic sample. A sample strength information acquisition step,
With respect to the individual color light sources, output light intensity information (hereinafter referred to as light source intensity information) and color information (hereinafter referred to as light source color information) change characteristics (hereinafter referred to as input light signals) with respect to an input signal to the color light source. A light source characteristic calculation step of calculating light source intensity information and change characteristics of light source color information together, referred to as a light source characteristic) based on each sample intensity information acquired for each combination including the color light source;
Input signal value reading for reading each input signal value to each color light source necessary for generating illumination light having a desired intensity and a desired color with reference to the individual light source characteristics calculated for the individual color light sources Process,
A method for calibrating a lighting device, comprising: In the calibration method of the illuminating device according to claim 1,
A signal input step of inputting each input signal of the value read in the input signal value reading step to each color light source;
A calibration method for an illuminating device. In the calibration method of the illuminating device according to claim 1 or 2,
A sample member having a substrate and the plurality of spectral characteristic samples respectively disposed in predetermined regions of the substrate;
In the sample strength information acquisition step,
While changing the input signal value to each color light source by the input signal control means, each color light source is sequentially emitted individually with each color light to illuminate the sample member, and the sample member is sequentially imaged to obtain the individual color light source. A sample image data acquisition step of acquiring image data (hereinafter referred to as sample image data) every time,
A spectral characteristic sample region selection step of sequentially selecting each of the sample image data individually corresponding to the individual spectral characteristic sample (hereinafter referred to as a spectral characteristic sample region);
Based on the light intensity data included in each spectral characteristic sample region selected in the spectral characteristic sample region selection step, the sample intensity information for each combination including one spectral characteristic sample corresponding to the spectral characteristic sample region Sample strength information calculation step for calculating
A method for calibrating a lighting device, comprising: In the calibration method of the illuminating device in any one of Claims 1-3,
The illumination device is provided in an image processing device that performs predetermined image processing on image data acquired by an imaging unit that captures an imaging target, and is used for illumination of the imaging target.
In the sample intensity information acquisition step, each sample characteristic information is acquired by imaging each spectral characteristic sample by the imaging means,
A calibration method for an illuminating device. A plurality of color light sources capable of emitting light of different colors, and input signal control means for individually controlling each input signal for causing each color light source to emit each color light, and input by the input signal control means A calibration device for an illuminating device that performs illumination with combined light of each color light emitted from each color light source under signal control,
Prepare at least three spectral characteristic samples having predetermined spectral characteristics different from each other, and sequentially emit each color light to each color light source while changing the input signal value to each color light source by the input signal control means. Sample intensity information for illuminating a spectral characteristic sample and obtaining intensity information (sample intensity information) of light generated through the spectral characteristic sample for each combination of the individual color light source and the individual spectral characteristic sample Acquisition means;
For each individual color light source, intensity information (light source intensity information) of emitted light with respect to an input signal to the color light source and change characteristics (light source characteristics) of color information (light source color information) for each combination including the color light source Light source characteristic calculation means for calculating based on each acquired sample intensity information;
Input signal value reading for reading each input signal value to each color light source necessary for generating illumination light having a desired intensity and a desired color with reference to the individual light source characteristics calculated for the individual color light sources Means,
A calibration apparatus for an illumination device, comprising: A plurality of color light sources capable of emitting light of different colors, and input signal control means for individually controlling each input signal for causing each color light source to emit each color light, and input by the input signal control means A calibration program for an illumination device that performs illumination with combined light of each color light emitted by each color light source under signal control,
Prepare at least three spectral characteristic samples having predetermined spectral characteristics different from each other, and sequentially emit each color light to each color light source while changing the input signal value to each color light source by the input signal control means. Illuminate the spectral characteristic sample, and obtain intensity information (hereinafter referred to as sample intensity information) of the light generated through each spectral characteristic sample for each combination of the individual color light source and the individual spectral characteristic sample. A sample strength information acquisition step,
With respect to the individual color light sources, emission light intensity information (hereinafter referred to as light source intensity information) and color information (hereinafter referred to as light source color information) change characteristics (hereinafter referred to as input signals) with respect to an input signal to the color light source. A light source characteristic calculation step of calculating light source intensity information and change characteristics of light source color information together, referred to as a light source characteristic) based on each sample intensity information acquired for each combination including the color light source;
Input signal value reading for reading each input signal value to each color light source necessary for generating illumination light having a desired intensity and a desired color with reference to the individual light source characteristics calculated for the individual color light sources Process,
To run on a computer,
An illumination apparatus calibration program characterized by the above. A calibration program for a lighting device according to claim 6 is recorded and readable by a computer.
A recording medium characterized by the above. Calibrated by the lighting device calibration method according to any one of claims 1 to 4.
A lighting device characterized by that. Imaging means;
An illumination device calibrated by the illumination device calibration method according to claim 4;
With
The imaging object illuminated by the illumination device is imaged by the imaging means, and predetermined image processing is performed on the acquired image data.
An image processing apparatus.

Images