JP5509053B2 - Color temperature component analyzer - Google Patents

Description

  The present invention relates to a color temperature component analyzer that measures the color of a light source, for example, and outputs color correction information such as the color temperature and the amount of deviation from a black body radiation distribution. It is related with the thing which can measure the deviation | shift amount from a color temperature and a black body radiation distribution with high precision, preventing increase of this.

For example, photographing light sources used for photography such as photographs and movies include natural light (sunlight), tungsten light (incandescent light bulb), flash light, fluorescent light, mercury lamp, and mixed light thereof. Differences in the nature of images appear as differences in the colors of images and videos.
Therefore, in order for an illuminated subject to be recorded with an appropriate color balance, color correction such as using a filter according to the type of light source at the time of shooting, changing the color temperature setting at the time of shooting, or It is necessary to appropriately set the color temperature, the amount of deviation, etc. by adjusting the light source itself.

The color temperature component analyzer is a measuring device that measures light from a light source and outputs color temperature information and a deviation amount useful for setting and adjusting such a camera and light source.
Conventionally, as such a color temperature component analyzing apparatus, a color thermometer is known in which RGB light-color filters are provided in three light-receiving units to vary spectral sensitivities and the color temperature of a light source is measured based on the output of each light-receiving unit. (For example, refer to Patent Document 1).

For example, Non-Patent Document 1 describes a method for measuring a distribution temperature, a color temperature, and a correlated color temperature of a light source as a conventional technique related to such a method for measuring a color temperature or the like.
According to this, for the correlated color temperature, the tristimulus value XYZ of the light source color is measured, thereby obtaining the chromaticity coordinates u and v on the CIE1960 chromaticity diagram, and this value and the black body radiation locus on the chromaticity diagram. In particular, when the chromaticity coordinates u and v of the sample light source are on the black body radiation locus, the color temperature is referred to.
In addition, when a deviation from the black body radiation locus is taken, the closest color temperature is adopted, and a set of the color temperature deviation from the black body radiation locus and a set of coordinates are defined as the correlated color temperature.
Further, in different known techniques described in the same document, it is described that the logarithmic value of the energy ratio of two different wavelengths in the distribution in the Planck blackbody radiation distribution correlates with the inverse of the blackbody radiation temperature. .

  Further, Patent Document 2 discloses, as a prior art related to a color temperature calculation method, for the purpose of calculating a color temperature with high accuracy even when the deviation of the illumination condition from the black body locus is large. Using the black body locus on the chromaticity diagram and one or more virtual locus shifted from the black body locus, the first and second color temperatures are obtained, respectively, and the difference between the first and second color temperatures is minimized. A color temperature calculation method for calculating a color temperature by averaging a pair of color temperatures is described.

Japanese Patent Laid-Open No. 5-223463 Japanese Patent No. 3538963

Japanese Industrial Standard JIS Z8725-1999 “Measurement Method of Light Source Distribution Temperature, Color Temperature and Correlated Color Temperature”

In order to accurately obtain the color temperature of the light source different from the blackbody radiation distribution and the amount of deviation from the blackbody radiation distribution, three sensors obtained by a sensor having a spectral sensitivity that is highly consistent with the color matching function or a spectral sensor are used. A complicated process is required to accurately convert and read the stimulus value XYZ through the xy chromaticity coordinates.
In the prior art described in Non-Patent Document 1 described above, it is important how accurately the tristimulus values XYZ can be measured. That is, the accuracy depends on how close the sensor characteristics are to the spectral sensitivity of the color matching function.
However, in order to accurately create a sensor that approximates the color matching function, a spectral system that requires a sensor for each wavelength and a combined sensitivity spectral system that weights and synthesizes multiple sensor outputs are essential. And the cost will be high. In addition, even if a sensor that approximates the color matching function can be made in the design, even if the correction value of the actual matching is used for the variation in parts and the characteristic change due to the environment, the approximation with the color matching function is maintained, It is difficult to ensure accuracy.
In addition, since the technique described in Patent Document 2 needs to handle coordinate values on the xy chromaticity diagram, the calculation load when calculating color temperature or the like increases, or the calculation results are tabulated in advance. It is necessary to hold what has been done, and the apparatus becomes complicated.

Today, many light sources such as fluorescent lamps and LEDs are not equal to the blackbody radiation distribution, and in many color temperature measurement devices, the color temperature value excluding the amount of deviation from the blackbody radiation distribution. Only is shown.
In addition, even when the distance between the correlated color temperature value on the chromaticity diagram coordinates faithful to the standard and the black body locus on the coordinates is displayed as the amount of deviation from the black body radiation, as a control unit, It is a situation that is difficult for industrial use, and for example, it is desired to provide color correction information applicable to control of illumination light sources, electronic cameras, and the like.

  The problem of the present invention is that the color temperature based on the closest black body radiation color temperature and the amount of deviation from the black body radiation locus without using the chromaticity diagram coordinates by the colorimetric means having spectral sensitivity approximate to the color matching function. It is an object of the present invention to provide a color temperature component analyzing apparatus capable of detecting the color temperature.

The present invention solves the above-described problems by the following means.
The invention of claim 1 is a color temperature component analyzing apparatus that measures light and outputs color temperature information, and has a spectral sensitivity of at least three colors approximate to a color matching function and outputs a photometric signal corresponding to the amount of light. A two-color colorimetric method for obtaining a plurality of black-body radiant energy two-color colorimetric temperature values based on a plank black-body radiation type using different color combinations by using a colorimetric unit for measuring and a photometric signal output from the colorimetric unit An average black body radiant color temperature value, which is an average value of a plurality of black body radiant energy dichroic color temperature values calculated by the temperature output means and the two color ratio color temperature output means based on different color combinations, respectively. Color temperature information output means for outputting as the color temperature information, black which is the difference between the black body radiant energy two-color ratio color temperature value obtained by the two-color ratio color temperature output means and the average black body radiation color temperature value Deviation information that outputs the deviation from the body radiation distribution A color temperature component analyzer, characterized by an output means.

  According to a second aspect of the invention, the two-color ratio color temperature output means outputs the first black body radiant energy two-color ratio color temperature value based on the blue component and the red component, and based on the blue component and the green component. The second black body radiant energy 2 color ratio color temperature value is output, and the color temperature information output means outputs the first black body radiant energy 2 color ratio color temperature value and the second black body radiant energy 2. An average black body radiation color temperature value that is an average value of the color ratio color temperature value is output as the color temperature information, and the deviation amount information output means is the first black body radiation energy 2 color ratio color temperature value. And the average black body radiant color temperature value, the difference in red component from the black body radiant distribution of the average color temperature value, and the second black body radiant energy dichroic color temperature value and the average black The green component divergence amount from the black body radiation distribution of the average color temperature value, which is the difference from the body radiation color temperature value, A color temperature component analyzer according to claim 1, characterized in that output as information.

  According to a third aspect of the present invention, there is provided a reference color temperature setting means for setting a predetermined reference color temperature, and the deviation amount information output means includes the first black body radiant energy dichroic color temperature value and the reference color temperature. A reference color temperature value that is a difference between the red color component and a reference color temperature value that is a difference between the second black body radiation energy dichroic color temperature value and the reference color temperature value. 3. The color temperature component analyzer according to claim 2, wherein a green component deviation amount from a black body radiation distribution of a color temperature value is output as the deviation amount information.

  According to a fourth aspect of the present invention, there is provided display means for simultaneously displaying at least one of the color temperature information and the deviation amount information, and color correction information obtained based on the deviation amount information. The color temperature component analyzer according to any one of claims 1 to 3.

  The invention according to claim 5 is provided with a function of outputting tristimulus values and xy chromaticity values based on the output of the colorimetric means, according to any one of claims 1 to 4. This is a color temperature component analyzer.

In the present invention, in Planck's black body radiation type, a known law is used in which the inverse value (mired) of the black body radiation temperature is a function of the logarithm of the two-color ratio.
The function described above is a first function derived by a combination of two color ratios having different spectral sensitivities and a second function derived by a combination of two color ratios having different spectral sensitivities.
The average value of the first and second sets of two-color colorimetric temperatures (mireds) having spectral sensitivity that covers the visible region of the blackbody radiation distribution is the average blackbody radiation color temperature in the visible region.
If the light source approximates or is equal to the blackbody radiation distribution, the average blackbody radiation color temperature and the two sets of two-color colorimetric temperatures (mireds) are infinitely equal. That is, the average value is the closest black body radiation color temperature.

In order to obtain different color temperatures from the first and second functions described above, the difference between the function's Milled values becomes the logarithmic difference between the two color ratios of the function, and the difference is the correction coefficient value (deviation amount information of the input measurement signal). ).
When the light source is not equal to the black body radiation distribution, the two sets of two-color colorimetric temperatures (Mired) are not equal, and the difference from the average value is obtained from the first and second functions. Can be calculated as a correction coefficient of the input signal in the green region and the red region.
As described above, according to the present invention, the color temperature and the black body based on the nearest black body radiation color temperature without using the chromaticity diagram coordinates by the color measurement means having the spectral sensitivity approximate to the color matching function. It is possible to provide a color temperature component analyzing apparatus capable of detecting a deviation amount from a radiation locus.

It is an external view in embodiment of the color temperature component analyzer to which this invention is applied. It is a block diagram which shows the internal structure of the color temperature component analyzer of FIG. 3 is a flowchart illustrating an example of the operation of the color temperature component analysis apparatus in FIG. 1. It is a figure which shows an example of the display of the display part of the color temperature component analyzer of FIG. It is a figure which shows the other example of a display of the display part of the color temperature component analyzer of FIG. It is a graph which shows an example of the calculation result in the color temperature component analyzer of FIG.

Hereinafter, an embodiment of a color temperature component analyzer to which the present invention is applied will be described with reference to the drawings.
FIG. 1 is an external view of a color temperature component analyzer according to the present embodiment.
The color temperature component analyzer 1 includes a main body 10 and a sensor housing 50.
The main body 10 includes an operation unit 20, a display unit 30, an external interface 40, and the like.

  The operation unit 20 includes a power button 21, a metering button 22, a reference color temperature setting button 23, a menu mode button 24, a preset switching button 25, a range switching button 26, a metering mode switching button 27, a display switching button 28, a dial 29, and the like. It is prepared for.

The power button 21 is used to input an on / off operation of the color temperature component analyzer 1.
The photometry button 22 receives a measurement start operation.
The reference color temperature setting button 23 is operated to store a measurement value to be used as a reference value as a reference value when the measurement value at a certain point is used as a reference and other points are set to the same color temperature.

The menu mode button 24 is operated when displaying a menu screen for selecting a photometry mode or the like.
The preset switching button 25 is operated when calling a photometric setting preset by the user in advance. The preset photometry setting is called by turning the dial 29 while pressing the preset switching button 25.
The reference color temperature setting button 23 described above stores a measured value at a certain point, but this button is operated when inputting a numerical value for the reference color temperature.

  The range switching button 26 receives an operation for switching the photometric range according to the amount of the flash light when the flash light is measured. As the photometric range of the flash light, for example, two stages of an H (high) range and an L (low) range are prepared. When under display or over display appears on the display unit 30 during metering, the user switches the range by turning the dial 29 while pressing the range switch button 26.

  The photometry mode switching button 27 is operated when switching between the measurement modes of steady light measurement, cordless flash light measurement, code-in flash light measurement, radio wave flash light measurement, and radio wave trigger channel setting mode. Each mode is selected by turning the dial 29 while pressing the photometry mode switching button 27.

The display switching button 28 is operated when a display mode for displaying the photometric result is selected. The color temperature component analyzer 1 has a plurality of display modes.
The display mode consists of the following five modes.
D1: Color correction value% display (Target: Average color temperature)
D2: Color correction value% display (Target: Reference color temperature set by user)
D3: Color correction value EV display (Target: Average color temperature)
D4: Color correction value EV display (target: reference color temperature set by the user)
D5: Tristimulus value, chromaticity, and illuminance display EV is an abbreviation of exposure value and is a unit generally used in the field of photography.
The display mode is switched by turning the dial 29 while pressing the display switching button 28.
The dial 29 is a rotary operation unit used for the various operations described above.

The display unit 30 is a liquid crystal display device (LCD) provided on the front surface of the main body unit 10.
The external interface 40 is connected to and communicates with an external information processing apparatus such as a computer. The external interface 40 includes a USB terminal, for example.
The external interface 40 can transfer output values, weighting factors, color correction information, and the like of each of the four photometric sensors of the light receiving unit 51 to an external information processing apparatus. The color temperature component analyzer 1 can perform various operations from an external information processing apparatus via the external interface 40.

The sensor housing portion 50 is provided on the upper portion of the main body portion 10 and is supported to be rotatable with respect to the main body portion 10.
The sensor housing part 50 includes a light receiving part 51 into which light to be measured is incident.
The light receiving unit 51 includes, for example, four photometric sensors S _nλ (n = 1 to 4) (not shown) having different spectral sensitivities inside a flat cover formed using a milky white translucent resin material. Has been. The light receiving unit 51 outputs an AD conversion value for each range corresponding to the brightness.

FIG. 2 is a block diagram showing the internal configuration of the color temperature component analysis apparatus 1.
The color temperature component analyzer 1 further includes an information processing unit 100. The information processing unit 100 includes a four-color photometric value calculation unit 110, a three-color signal processing unit 120, a mired value calculation unit 140, a color correction value calculation unit 160, an average color temperature calculation unit 170, and the like.

The four-color photometric value calculation unit 110 converts the AD conversion value from the light receiving unit into a four-color signal value.
Here, each signal value is represented by the following Equation 1.

S _n = ∫P _λ · S _nλ · d _λ (n = 1 to 4)
Where P _λ = light source

分光感度発生部１２２は、所定の分光感度変換係数（ａ_ｉｊ）を三色値算出部１２１に提供する。本実施形態においては、合成三色分光感度を等色関数に近似させるようにしている。
等色関数とは、Ｗ．Ｇ．ＷｒｉｇｈｔとＪ．Ｇｕｉｌｄの等色実験に基づき、ＣＩＥで定められた等エネルギスペクトルに対する目の感度であるスペクトル刺激値の感度曲線である。 The three-color signal processing unit 120 calculates the three-color value RGB based on the four-color signal value from the four-color photometric value calculation unit 110.
The three-color signal processing unit 120 includes a three-color value calculation unit 121 and a spectral sensitivity generation unit 122.
The three-color value calculation unit 121 performs weighting processing on the four-color signal values S _n (n = 1 to 4) with a predetermined spectral sensitivity conversion coefficient (a _ij ) as shown in Equations 2 and 3 below. The color value RGB is calculated. The three-color value calculation unit 121 is a color measurement unit referred to in the present invention. The spectral sensitivity conversion coefficient (a _ij ) is a weighting coefficient when performing this weighting process.

The spectral sensitivity generation unit 122 provides a predetermined spectral sensitivity conversion coefficient (a _ij ) to the three-color value calculation unit 121. In the present embodiment, the combined three-color spectral sensitivity is approximated to a color matching function.
The color matching function is W.W. G. Wright and J.W. It is a sensitivity curve of a spectrum stimulus value which is the sensitivity of the eye to the equal energy spectrum determined by CIE based on Guild's color matching experiment.

ここで、α、ｒはともに所定の係数であり、Ｒｆｏ、Ｇｆｏ、Ｂｄｏは各色の三色値（出力）を示している。また、ｍ_ｒｅｄ及びｍ_{ｇｒｅｅｎ}はそれぞれ重み付けの係数である。 The mired value calculation unit 140 calculates logarithmically converted values of the two color ratios BR and BG (or RG) of the three color values RGB calculated by the three color value calculation unit 121 as shown in the following equations 4 and 5. The types of mired values BR mired (MRD _red ) and BG mired (MRD _green ) are calculated.

Here, α and r are both predetermined coefficients, and Rfo, Gfo, and Bdo indicate the three color values (outputs) of the respective colors. _{M red} and m _green are weighting coefficients, respectively.

The average color temperature calculation unit 170 calculates the color temperature K, which is an average color temperature value (pseudo-correlated color temperature), the deviation amount ΔMRD _red , and the deviation amount ΔMRD _green from the mired values from the mired value calculation unit 140 as follows: Calculation is performed using Equation 6, Equation 7, and Equation 8.

K = 1000000 / ((MRD _red + MRD _green ) / 2) Equation 6
ΔMRD _red = MRD _red − ((MRD _red + MRD _green ) / 2) Equation 7
ΔMRD _green = MRD _green − ((MRD _red + MRD _green ) / 2) Equation 8

The color correction value calculation unit 160 selects a color correction amount (deviation amount) corresponding to the selected control unit and target color temperature from the mired value from the mired value calculation unit 140 and the deviation amount from the average color temperature calculation unit 170. Information).
Here, the color correction amount includes an R component correction amount, a G component correction amount, and the like.
The color correction value calculation unit 160 is a deviation amount information output unit according to the present invention.

For example, when the selected control unit is% and the target color temperature is the average color temperature,
R component correction amount (ΔR _% ) = − (1-2e ((14/1000) · ΔMRD _red )) · 100 ··· Equation 9
G component correction amount (ΔG _% ) = − (1-2e ((7/1000) · ΔMRD _green )) · 100 ·· Equation 10

When the selected control unit is EV and the target color temperature is the average color temperature,
R component correction amount (ΔR _EV ) − (14/1000) · ΔMRD _red ·· Equation 11
G component correction amount (ΔG _EV ) − (7/1000) · ΔMRD _green ·· Equation 12

When the selected control unit is% and the target color temperature is the reference color temperature set by the user,
R component correction amount (ΔR _% ) = 1-2e ((14/1000) · ((1000000 / K) −MRD _red )) · 100 ·· Equation 13
G component correction amount (ΔG _% ) = 1-2e ((7/1000) · ((1000000 / K) −MRD _green )) · 100 ·· Equation 14
Where K = reference color temperature set by the user (Kelvin)

When the selected control unit is EV and the target color temperature is the reference color temperature set by the user,
R component correction amount (ΔR _EV ) = (14/1000) · ((1000000 / K) −MRD _red ) ·· Equation 15
G component correction amount (ΔG _EV ) = (7/1000) · ((1000000 / K) −MRD _green ) ·· Equation 16
Where K = reference color temperature set by the user (Kelvin)

Note that (14/1000) and (7/1000) in Equations 9 to 16 are examples, and other values may be taken.

Next, the operation of the color temperature component analyzer 1 will be described.
FIG. 3 is a flowchart showing an example of the operation of the color temperature component analysis apparatus 1. Hereinafter, the steps will be described step by step.

<Step S01: Metering button pressed>
In response to a long press operation of the photometry button 22 by the user, the color temperature component analyzer 1 starts a photometry sequence described below. Proceed to step S02.
<Step S02: Photometric processing>
The four-color photometric value calculation unit 110 of the information processing unit 100 acquires counts S _{1 to} S ₄ of output values from each sensor of the light receiving unit 51. Proceed to step S03.
<Step S03: Base count correction>
The four-color photometric values 110 are provided to the three-color signal processing unit 120 by subtracting predetermined base values S _{1BASE to} S _4BASE from the count values S _{1 to} S ₄ in order to align the output characteristics of each sensor. Proceed to step S04.

<Step S04: Matrix Calculation>
The three-color signal processing unit 120 performs the matrix operation shown in the above-described Expression 2 and Expression 3, weights the output value of each sensor, and generates the three-color value RGB in the selected mode. The three-color signal processing unit 120 provides the obtained three-color value RGB to the miled value calculation unit 140. Proceed to step S05.

<Step S05: Milled value calculation>
The mired value calculation unit 140 calculates the mired values MRD _red and MRD _{green according} to the above-described equations 4 and 5. Proceed to step S06.

<Step S06: Average Color Temperature Calculation>
The average color temperature calculation unit 170 calculates the average color temperature value K using Equation 6 described above, calculates ΔMRD _red using Equation 7, and calculates ΔMRD _green using Equation 8.
Proceed to step S07.

<Step S07: Discrimination of display mode>
When the color correction value% display (target: average color temperature) mode is selected by the user, the process proceeds to step S10.
If the color correction value EV display (target: average color temperature) mode is selected, the process proceeds to step S20.
If the color correction value% display (target: reference color temperature set by the user) mode is selected, the process proceeds to step S30.
If the color correction value EV display (target: reference color temperature set by the user) mode is selected, the process proceeds to step S40.
When the tristimulus value / chromaticity / illuminance display mode is selected, the process proceeds to step S50.

<Step S10: Color Correction Value% Display (Target: Average Color Temperature)>
The display unit 30 displays K obtained by Equation 6, ΔMRD _red obtained by Equation 7, ΔMRD _green obtained by Equation 8, ΔR _% obtained by Equation 9, and ΔG _% obtained by Equation 10. To do.
FIG. 4 is a display example at this time.

<Step S20: Color Correction Value EV Display (Target: Average Color Temperature)>
The display unit 30 displays K obtained by Equation 6, ΔMRD _red obtained by Equation 7, ΔMRD _green obtained by Equation 8, ΔR _EV obtained by Equation 11, and ΔG _EV obtained by Equation 12. To do.

<Step S30: Color Correction Value% Display (Target: Reference Color Temperature Set by User)>
The display unit 30 displays K obtained by Expression 6, ΔMRD _red obtained by Expression 7, ΔMRD _green obtained by Expression 8, ΔR _% obtained by Expression 13, and ΔG _% obtained by Expression 14. To do.

<Step S40: Color Correction Value EV Display (Target: Reference Color Temperature Set by User)>
The display unit 30 displays K obtained by Equation 6, ΔMRD _red obtained by Equation 7, ΔMRD _green obtained by Equation 8, ΔR _EV obtained by Equation 15, and ΔG _EV obtained by Equation 16. To do.

<Step S50: Tristimulus value / chromaticity / illuminance display>
The display unit 30 calculates based on the tristimulus values XYZ and xy chromaticity values based on the output of the light receiving unit 51 and the output value S3 after the base count correction of the sensor corresponding to the green region among the sensors of the light receiving unit 51. Display the illuminance.
FIG. 5 shows a display example on the display unit 30 at this time.

Hereinafter, an example of the color temperature calculation result in the color temperature component analyzer 1 of the embodiment will be described.
FIG. 6 is a graph showing the spectral energy distribution of the sample light source and the spectral energy distribution in which the color temperature value calculated by each color temperature measurement method is expressed by the Planck radiation method. In FIG. 6, the horizontal axis indicates the wavelength, and the vertical axis indicates the energy.
M1 represents the spectral energy distribution of the sample light source.
M2 represents a spectral energy distribution in which the distribution temperature according to the ratio of the response of the sample light source to the X wavelength (R) and the Z wavelength (B) is expressed by a Planck radiation equation.
M3 represents a spectral energy distribution in which the distribution temperature according to the ratio of the response of the sample light source to the Y wavelength (G) and the Z wavelength (B) is expressed by a Planck radiation equation.
M4 is a spectral energy distribution in which the average value of the distribution temperature based on the ratio of the response of the sample light source to the X wavelength and the Z wavelength and the distribution temperature based on the ratio of the response of the sample light source to the Y wavelength and the Z wavelength is expressed by a Planck radiation equation. Is shown.
M5 shows the spectral energy distribution in which the correlated color temperature (Tc) of the sample light source is expressed by the Planck radiation equation.

As shown in FIG. 6, in the case of this sample light source, the distribution temperature M2 due to the response ratio between the X wavelength and the Z wavelength is higher than the correlated color temperature M5, and the distribution due to the response ratio between the Y wavelength and the Z wavelength. The temperature M3 goes low.
However, in the case of the present embodiment, the measured value can be brought close to the correlated color temperature M5 by taking the average temperature M4 of the distribution temperature M2 and the distribution temperature M3.

  As described above, according to the present embodiment, three wavelengths are to be sampled, and the Kelvin value (the Kelvin value (black body radiation energy 2 colorimetric temperature value)) calculated from the sampling wavelengths of different combinations is calculated. By calculating (three-color color temperature), the measurement accuracy of the three-color color temperature can be improved. For this reason, even if a sensor having spectral sensitivity characteristics approximate to a color matching function cannot be used, the calculated Kelvin value can be handled as a pseudo correlation color temperature. In addition, when a sensor approximating the color matching function can be used, the measurement accuracy can be further increased.

  The difference between the black body radiant energy and the two colorimetric temperature values calculated based on different color combinations indicates the amount of deviation from the black body radiation locus, and the parameter obtained based on the amount of deviation is the sample light source. Therefore, it is possible to obtain color correction information useful for light source adjustment and the like based on the difference between the Milled values MRDred and MRDgreen.

  Furthermore, by providing an external interface that transmits the output values, weighting factors, deviation information, etc. of the four photometric sensors of the light receiving unit to an external information processing device, three weighting factors that are not held in the main body are used. Color sensitivity synthesis and complicated processing that is difficult to execute in the main body can be executed in an external information processing apparatus, and the function of the color temperature component analysis apparatus 1 can be expanded. At this time, it is possible to perform appropriate processing on the information processing apparatus side by transmitting to the information processing apparatus side a unique sensor weight coefficient calibrated for each color temperature component analyzer 1 at the time of factory shipment or the like. . Further, since various operations can be performed using a pointing device such as a keyboard of a computer or a mouse, the operability is improved.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
For example, the method of obtaining the three-color spectral sensitivity is not limited to the synthetic spectral sensitivity method as in the embodiment, and may be based on other methods such as a stimulus value direct reading method and a spectrophotometric method.
Further, the display mode of the display unit and the combination of displayed information are not particularly limited.
As another method for calculating the amount of deviation from the reference color temperature, a color temperature conversion filter is calculated by a known method using a miled difference between the average color temperature value and the reference color temperature, and simultaneously calculated using Equations 7 and 8. The deviation amount can be used as a deviation amount from the reference color temperature.

DESCRIPTION OF SYMBOLS 1 Color temperature component analyzer 10 Main part 20 Operation part 21 Power button 22 Metering button 23 Standard color temperature setting button 24 Menu mode button 25 Preset switching button 26 Range switching button 27 Metering mode switching button 28 Display switching button 29 Dial 30 Display part 40 External Interface 50 Sensor Housing Unit 51 Light Receiving Unit 100 Information Processing Unit 110 Four Color Photometric Value Calculation Unit 120 Three Color Signal Processing Unit 121 Three Color Value Calculation Unit 122 Spectral Sensitivity Generation Unit 140 Milled Value Calculation Unit 150 White Sensitivity Setting Unit 160 Color Correction value calculation unit 170 Average color temperature calculation unit

Claims (5)

A color temperature component analyzer that measures light and outputs color temperature information,
A colorimetric means for outputting a photometric signal corresponding to the amount of light having a spectral sensitivity of at least three colors approximated to a color matching function;
Dichroic color temperature output means for obtaining a plurality of black body radiant energy dichroic color temperature values based on a plank black body radiation type using a photometric signal output from the color measuring means by different combinations of colors;
An average black body radiation color temperature value, which is an average value of a plurality of black body radiation energy two color ratio color temperature values calculated by the two color ratio color temperature output means based on different color combinations, is used as the color temperature information. Color temperature information output means for outputting;
Deviation amount information output for outputting a deviation amount from a black body radiation distribution, which is a difference between the black body radiation energy dichroic color temperature value obtained by the two color ratio color temperature output means and the average black body radiation color temperature value. And a color temperature component analyzing apparatus. The two-color ratio color temperature output means outputs a first black body radiation energy two-color ratio color temperature value based on a blue component and a red component, and a second black body radiation based on a blue component and a green component. Output energy 2 color ratio color temperature value,
The color temperature information output means is an average black body radiant color temperature value that is an average value of the first black body radiant energy dichroic temperature value and the second black body radiant energy dichroic temperature value. Is output as the color temperature information,
The divergence amount information output means includes a red component divergence from a black body radiation distribution of an average color temperature value which is a difference between the first black body radiant energy dichroic color temperature value and the average black body radiant color temperature value. And the amount of green component divergence from the black body radiation distribution of the average color temperature value, which is the difference between the second black body radiant energy two-color ratio color temperature value and the average black body radiation color temperature value, The color temperature component analysis apparatus according to claim 1, wherein the color temperature component analysis apparatus outputs the deviation amount information. Provided with a reference color temperature setting means for setting a predetermined reference color temperature;
The divergence amount information output means includes a red component divergence amount from a black body radiation distribution of a reference color temperature value which is a difference between the first black body radiant energy dichroic color temperature value and the reference color temperature value, and The amount of deviation of the green component from the black body radiation distribution of the reference color temperature value, which is the difference between the second black body radiant energy two-color colorimetric temperature value and the reference color temperature value, is output as the deviation amount information. The color temperature component analyzer according to claim 2. 4. A display unit that simultaneously displays at least one of the color temperature information and the deviation amount information, and color correction information obtained based on the deviation amount information. The color temperature component analyzer according to claim 1. The color temperature component analyzer according to any one of claims 1 to 4, further comprising a function of outputting tristimulus values and xy chromaticity values based on an output of the colorimetric means.

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