CN112484847B - Illuminance measuring device and illuminance measuring method - Google Patents
Illuminance measuring device and illuminance measuring method Download PDFInfo
- Publication number
- CN112484847B CN112484847B CN202011317004.4A CN202011317004A CN112484847B CN 112484847 B CN112484847 B CN 112484847B CN 202011317004 A CN202011317004 A CN 202011317004A CN 112484847 B CN112484847 B CN 112484847B
- Authority
- CN
- China
- Prior art keywords
- color
- light source
- illuminance
- color component
- correlated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 141
- 230000002596 correlated effect Effects 0.000 claims abstract description 90
- 230000000875 corresponding effect Effects 0.000 claims abstract description 11
- 238000000691 measurement method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 13
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005457 Black-body radiation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/60—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Spectrometry And Color Measurement (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention discloses an illuminance measuring device and an illuminance measuring method. The illuminance measuring device measures illuminance using a color image table, including: a color image table representing a plurality of color component measurements and chromaticity associated with a correlated color temperature of the light source; a color sensor that receives ambient light and outputs a plurality of color component measurements of the ambient light; a color temperature calculating unit that obtains correlated color temperatures corresponding to the plurality of color component measurement values of the ambient light from a color image table; an illuminance calculation unit that inputs the acquired correlated color temperature of the ambient light into a correlated color temperature-illuminance formula, and calculates an illuminance based on the ambient light, wherein the correlated color temperature-illuminance formula is determined from a relationship between a value obtained by dividing a sum of a plurality of color component measurement values of the light source by the illuminance based on the light source and the correlated color temperature of the light source.
Description
Technical Field
The present invention relates to the field of color sensors, and more particularly, to an illuminance measuring apparatus and an illuminance measuring method.
Background
In addition to portable electronic devices such as mobile phones and tablet computers, illuminance sensors are also used in image electronic devices such as TVs and monitors. The illuminance sensor is a sensor that senses the brightness around the electronic device. A color sensor, which is one type of illuminance sensor, measures the color and brightness of ambient light, generating measured values of the respective color components. The measurement value generated by the illuminance sensor is used to adjust the brightness of the display. In a dark environment, even if the brightness of the display is lowered, the user can recognize the image or information displayed on the display, but in contrast, in a brighter environment such as outdoors, when the brightness of the display is low, it may be difficult to recognize the displayed image or information.
The color sensor measures the intensity of each color component of the ambient light, such as the intensities of red, green, and blue light, through the color filter. Multiple color component measurements may be used to measure illuminance based on ambient light. On the other hand, unlike a precision spectrophotometer, the color component measurement values generated by the color sensor have very large deviations based on different color temperatures. Therefore, the illuminance calculated from the measured values of the respective color components of the color sensor also does not substantially match the actual illuminance.
Disclosure of Invention
Technical problem to be solved
The invention discloses an illuminance measuring device and an illuminance measuring method, in particular to a scheme which utilizes a color sensor to measure the correlated color temperature of ambient light and can accurately measure the illuminance based on the ambient light by utilizing the correlated color temperature.
Means for solving the technical problems
According to an aspect of the present invention, there is provided an illuminance measuring device for measuring illuminance using a color image table, the illuminance measuring device including: a color image table representing a plurality of color component measurements and chromaticity associated with a correlated color temperature of the light source; a color sensor that receives ambient light and outputs a plurality of color component measurements of the ambient light; a color temperature calculation unit that obtains correlated color temperatures of the ambient light corresponding to a plurality of color component measurement values of the ambient light from the color image table; an illuminance calculation unit that inputs the acquired correlated color temperature of the ambient light to a correlated color temperature-illuminance formula determined by dividing a sum of a plurality of color component measurement values of the light source by a relationship between a value obtained based on the illuminance of the light source and the correlated color temperature of the light source, and calculates an illuminance based on the ambient light.
As an embodiment, the correlated color temperature-illuminance formula is a polynomial representing a trend line determined by representing the correlated color temperature of the light source as coordinates on a first axis on a two-dimensional coordinate system and a value obtained by dividing a sum of a plurality of color component measurement values of the light source by an illuminance based on the light source as coordinates on a second axis.
As an embodiment, a plurality of color component measurements of the light source associated with a correlated color temperature of the light source and a plurality of color component measurements of the ambient light are generated by the color sensor, a chromaticity of the light source and an illuminance of the light source are generated by a light source color/illuminance meter, the plurality of color component measurements of the light source and the chromaticity of the light source are associated with the color temperature of the light source.
As an embodiment, the color image table has a two-dimensional coordinate system associated with a plurality of color components of the light source, the chromaticity being a pixel value of a point determined based on the coordinate system.
As an embodiment, the point is determined based on a horizontal distance from an origin determined by dividing a first color component measurement value selected from a plurality of color component measurement values of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source, and a vertical distance from the origin determined by dividing a second color component measurement value selected from the plurality of color component measurement values of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source.
As an embodiment, the pixel values are RGB color values and the chromaticity is a color value with respect to at least two color components of the RGB color values.
As an embodiment, the color image table is generated by interpolating the pixel values.
As an embodiment, the color temperature calculating section obtains the chromaticity based on a pixel value of a point determined by a horizontal distance, which is a horizontal distance from an origin determined by dividing a value obtained by dividing a first color component measurement value selected from the plurality of color component measurement values of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light, and a vertical distance, which is a vertical distance from the origin determined by dividing a second color component measurement value selected from the plurality of color component measurement values of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light.
According to another aspect of the present invention, there is provided an illuminance measurement method of measuring illuminance using a color image table, the illuminance measurement method including: the color sensor outputs a plurality of color component measurements of the ambient light; obtaining a correlated color temperature of the ambient light corresponding to a plurality of color component measurements of the ambient light from the color image table representing a plurality of color component measurements and chromaticity of the light source associated with the correlated color temperature of the light source; inputting the acquired correlated color temperature of the ambient light into a correlated color temperature-illuminance formula, and calculating the illuminance of the ambient light, wherein the correlated color temperature-illuminance formula is determined according to the relation between the sum of a plurality of color component measurement values of the light source divided by a value obtained based on the illuminance of the light source and the correlated color temperature of the light source.
As an embodiment, the color image table includes pixel values of points determined according to a horizontal distance, which is a horizontal distance from an origin determined by dividing a value obtained by dividing a first color component measurement value selected from a plurality of color component measurement values of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source, and a vertical distance, which is a vertical distance from the origin determined by dividing a second color component measurement value selected from the plurality of color component measurement values of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source.
As an embodiment, the pixel values are RGB color values and the chromaticity is a color value with respect to at least two color components of the RGB color values.
As an embodiment, the color image table is generated by interpolating the pixel values.
As an embodiment, the step of obtaining the correlated color temperature of the ambient light corresponding to the plurality of color component measurements of the ambient light from a color image table representing the plurality of color component measurements and chromaticity of the light source associated with the correlated color temperature of the light source comprises: calculating a horizontal distance from an origin determined by dividing a first color component measurement value selected from the plurality of color components of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light; calculating a vertical distance, which is a vertical distance from the origin determined by dividing a second color component measurement value selected from a plurality of color components of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light; acquiring the chromaticity based on pixel values of points determined according to the horizontal distance and the vertical distance; and calculating the correlated color temperature of the ambient light by using the chromaticity.
As an embodiment, the correlated color temperature-illuminance formula is a polynomial representing a trend line determined by representing the correlated color temperature of the light source as coordinates on a first axis on a two-dimensional coordinate system and a value obtained by dividing a sum of a plurality of color component measurement values of the light source by an illuminance based on the light source as coordinates on a second axis.
As an embodiment, a plurality of color component measurements of the light source associated with a correlated color temperature of the light source and a plurality of color component measurements of the ambient light are generated by the color sensor, a chromaticity of the light source and an illuminance of the light source are generated by a light source color/illuminance meter, and the plurality of color component measurements of the light source and the chromaticity of the light source are associated by the correlated color temperature of the light source.
Effects of the invention
According to the embodiment of the present invention, the correlated color temperature of the ambient light is measured by the color sensor, and the illuminance based on the ambient light can be accurately measured by the correlated color temperature.
Drawings
The invention will now be described with reference to the embodiments shown in the drawings. For ease of understanding, the same reference numerals are given to the same constituent elements throughout the drawings. The configuration shown in the drawings is merely an example for illustrating the present invention, and the protective scope of the present invention is not limited thereto.
FIG. 1 is a diagram schematically illustrating an electronic device for adjusting the brightness of a display using a color sensor;
FIG. 2 is a diagram schematically illustrating the manner in which measurement data is collected for generating a color image table;
FIG. 3 is a diagram schematically illustrating a process of generating a color image table;
fig. 4 is a diagram showing a process of deriving a correlated color temperature-illuminance formula;
fig. 5 is a functional block diagram showing an illuminance measuring device that measures illuminance of ambient light using a color sensor;
fig. 6 is a diagram schematically showing the manner in which the correlated color temperature and illuminance are determined from the color component measurement values of the color sensor;
Fig. 7 is a diagram schematically showing other ways of determining the correlated color temperature from the measurement value of the color illuminance sensor.
Detailed Description
While the invention is susceptible to various modifications and alternative embodiments, specific embodiments thereof are shown in the drawings and are herein described in detail. It should be understood, however, that these examples are not intended to limit the invention to the particular embodiments, but to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Embodiments of the present invention will be described in detail below with reference to the associated drawings.
Fig. 1 is a diagram schematically illustrating an electronic device for adjusting illuminance of a display using a color sensor.
Referring to fig. 1, an electronic device 10 is capable of automatically adjusting the correlated color temperature of an image displayed in a display 11. The electronic device 10 is a device incorporating a display 11, such as a smart phone or a TV.
The electronic device 10 measures color component measurements 100 acquired with a built-in color sensor. The color sensor measures a plurality of color components of the ambient light, and the plurality of color components may be, for example, red light R, green light G, blue light B, white light W, or the like, but these are only examples, and various forms of components may be measured. On the other hand, the color sensor may be provided not only to be exposed to the surface of the electronic device 10 but also to be disposed at the lower portion of the display 11.
The electronic device 10 uses the plurality of color component measurements to calculate a correlated color temperature 110 of the ambient light. The brightness of the display 11 of the electronic device 10 may be automatically adjusted according to the brightness of the ambient light. The plurality of color component measurement values are utilized as input values for calculating correlated color temperature from the color image table 115. The color image table 115 includes R, G, B as a plurality of color components, but these are examples only and may include color components that are otherwise represented. The process of generating the color image table 115 is illustrated in fig. 2 to 3.
The electronic device 10 uses the calculated correlated color temperature to calculate the ambient light based illuminance 120. The illuminance based on the ambient light can be calculated by inputting the correlated color temperature into a correlated color temperature-illuminance formula. A process of calculating a correlated color temperature-illuminance formula will be described with reference to fig. 2 to 3, and a process of calculating illuminance using a correlated color temperature-illuminance formula will be described with reference to fig. 4 to 5.
The electronic device 10 adjusts the brightness 130 of the display 11 according to the calculated illuminance.
Fig. 2 is a diagram schematically showing a manner of collecting measurement data for generating a color image table.
Referring to fig. 2, measurement data is generated by the color sensor 200 and the light source color/illuminance meter 13. The color sensor 200 and the light source color/illuminance measuring instrument 13 output measured values generated by light irradiated by the same light source 14. The color sensor 200 can output color component measurement values of, for example, red R, green G, blue B, and white W components for the light source 14, and the light source color/illuminance meter 13 can output chromaticity CIE x, CIE y of the light source 14 and illuminance based on the light source 14. When the color sensor 200 is an illuminance sensor under the display, that is, a sensor disposed at the lower portion of the display 11, the color component measurement value of the light source 14 may be generated in a state of being mounted on the electronic device 10 or at least in a state of being disposed at the lower portion of the display 11.
The light sources 14 generate light of different correlated color temperatures. The light source 14 is constituted by a plurality of light emitters, for example, bulbs, which generate light belonging to a specific wavelength band, and can generate light corresponding to a predetermined correlated color temperature. In the CIE 1931 standard color system, the correlated color temperature may be substantially the same on a straight line determined by a black body radiation curve or planck curve defined in a white region. That is, if two different chromaticities are located on the same straight line, there is the same correlated color temperature, but each chromaticity may be different according to the shown color that is different in position on the straight line. Thus, the light source 14 may combine light having a plurality of color components to generate various light having the same correlated color temperature.
The measured values of the individual color components of the color sensor 200 and the chromaticity CIE x, CIE y and illuminance of the light source color/illuminance measuring instrument 13 are correlated with the correlated color temperature of the light determined from the light source 14. In the measurement value table 115' shown in fig. 2, the correlated color temperature of the light source may be adjusted in units of certain sections, and as described above, the color components of the light may be different in the same correlated color temperature section. The color sensor 200 measures a plurality of color components in the light generated by the light source 14, and the light source color/illuminance measuring instrument 13 measures chromaticity CIE x, CIE y, and illuminance corresponding to the light generated by the light source 14.
Fig. 3 is a diagram schematically showing a process of generating a color image table.
Referring to fig. 3, the color image table 115 may be generated in a two-dimensional space using the measurement value table 115' (refer to fig. 2). For this purpose, a two-dimensional space 116' is generated, and color component measurement values selected from among the color component measurement values R S、GS、BS、WS included in the measurement value table 115' are represented in the two-dimensional space 116 '. The first axis (e.g., x-axis) and the second axis (e.g., y-axis) defining the two-dimensional space 116' may be orthogonal to each other.
The values on the first axis and the second axis of the two-dimensional space 116' may be represented by a color component measurement selected from the plurality of color component measurements R S、GS、BS、WS generated by the color sensor 200. When a point where the first axis intersects the second axis is assumed to be the origin, the position on the first axis of any point on the two-dimensional space 116' may be determined by a horizontal distance X from the origin, and the position on the second axis may be determined by a vertical distance Y. Wherein the horizontal distance X and the vertical distance Y may be defined as follows.
On the other hand, the pixel value of the point determined by the horizontal distance X on the first axis and the vertical distance Y on the second axis represents RGB color values, and includes chromaticity CIE X, CIE Y.
Color value (R, G, B) = (f (CIE X), 1, f (CIE Y)) of point (X, Y)
Where CIE x is used as the color value of R for the corresponding point (noteqchromaticity), 1 is used as the color value of G, and CIE y is used as the color value of B. Of course, the color values represented by the chromaticity CIE x, CIE y may be changed. Accordingly, the original color image table 115a may be represented by a single color having a luminance difference.
The color values (R, G, B) of the points (X, Y) have a range of 0 to 1, respectively, and when the maximum and minimum values of CIE x are set to x max and x min, respectively, R is defined as follows.
Also, when the maximum and minimum values of CIE y are set to y max and y min, respectively, B is defined as follows.
For example, the CIE x value and CIE y value may be defined as a range of values from 1800K to 12000K.
In the color image table, pixel values corresponding to arbitrary coordinates are represented by RGB color values for interpolation operation. As can be seen in the two-dimensional space 116', there are areas between the points where measurements are obtained where no measurements are obtained. Adjacent points having pixel values are connected, and interpolation operation is performed so as to assign pixel values to points in a region where a measured value is not obtained.
The original color image table 115a subjected to the interpolation operation can be expanded to the surroundings using an image editing tool such as Photoshop of ADOBE corporation or the like. The pixel values for each point on the original color image include chromaticity CIE x, CIE y, but are represented as RGB color values. Accordingly, the image editing tool can perform interpolation operation of expanding the pixel values on the boundary of the original color image table 115a to the outside of the boundary.
The expansion of the original color image table 115a to the surrounding is substantially the same as the expansion of the measured values. To obtain the expanded color image table 115b, the two-dimensional space 116 representing the acquired measurement values includes relatively more measurement values than the two-dimensional space 116' used to generate the original color image table 115 a. Thus, the expansion of the original color image table 115a can generate a color image table having a larger area with a smaller number of measured values than the actual number. In particular, the range of ambient light that can be covered by the expanded color image table 115b is also expanded as compared to the original color image table 115 a.
The noise included in the vicinity of the boundary of the expanded color image table 115b can be removed by a filter of the image editing tool, for example, MEDIAN FILTER of Photoshop or the like. The boundary of the color image table 115 may be gently expanded compared to the expanded color image table 115 b.
On the other hand, in the color image table 115, a plurality of points belonging to the same color temperature section are located substantially on the same straight line y=ax+b (hereinafter, referred to as isothermal line). The slope a and the y-axis intercept b may be calculated using coordinates of a plurality of points belonging to the same color temperature section, or may be calculated using at least a part or all of the color temperature sections. The calculated slope a and y-intercept b may be used when the color component measurement of the ambient light is outside the boundaries of the color image table 115.
Fig. 4 shows a process of deriving a correlated color temperature-illuminance formula.
Referring to fig. 4, a correlated color temperature-illuminance formula may be derived using the measurement table 115' (refer to fig. 2). For this purpose, a two-dimensional space is generated, which represents the color component measurement value selected from the color component measurement values R S、GS、BS、WS included in the measurement value table 115', the illuminance LUX based on the light source, and the correlated color temperature CCT. The first and second axes defining the two-dimensional space may be orthogonal to each other.
The value on the first axis of the two-dimensional space may be represented by a correlated color temperature CCT, and the value on the second axis may be represented by a value obtained by dividing a color component measurement value selected from a plurality of color component measurement values R S、GS、BS、WS generated by the color sensor 200 by an illuminance LUX based on the light source. Assuming that a point where the first axis intersects the second axis is an origin, a position on the first axis of any point on the two-dimensional space may be specified based on a horizontal distance X 'from the origin, and a position on the second axis may be specified based on a vertical distance Y'. Wherein the horizontal distance X 'and the vertical distance Y' may be defined as follows.
X′＝CCT
Even under the same illuminance, the magnitude of the measurement value of the color sensor 200 may be different depending on the color temperature of the ambient light. For example, a higher color temperature results in a relatively large measurement compared to a lower color temperature. The value on the second axis represents the ratio between the sum of the color component measurements of the light source and the actual illuminance based on the light source, which is related to the correlated color temperature on the first axis.
The plurality of points 117' representing points (X ', Y ') may be approximated as trend lines representing a certain relationship. The approximated trend line may be represented by a polynomial Y '=f (X'). The polynomial Y '=f (X') is used as the correlated color temperature-illuminance formula.
Fig. 5 is a functional block diagram showing an illuminance measuring device that measures illuminance of ambient light using a color sensor, fig. 6 is a diagram schematically showing a manner of determining a correlated color temperature and illuminance from a color component measurement value of the color sensor, and fig. 7 is a diagram schematically showing another manner of determining a correlated color temperature from a measurement value of the color illuminance sensor.
Referring to fig. 5, the illuminance measuring device includes a color sensor 200, a color image table 115, a color temperature calculation unit 210, and an illuminance calculation unit 220.
The color sensor 200 outputs a plurality of color component measurements R S'、GS'、BS'、WS' of the ambient light.
The color temperature calculating section 210 calculates a correlated color temperature using the color image table 115 and the measured plural color component measurement values R S'、GS'、BS ', WS' (Correlated Color Temperature). The color component measurement value R S'、GS'、BS'、WS' is used to obtain the chromaticity CIE x n、CIE yn from the color image table 115. The color temperature calculating unit 210 calculates a correlated color temperature using the acquired chromaticity CIE x n、CIE yn. A method of calculating a correlated color temperature using CIE x n、CIE yn as an input value is disclosed in various papers, so that a description thereof is omitted herein.
First, the color component measurement value used in the coordinates of the color image table in the color component measurement value R S'、GS'、BS'、WS' of the ambient light is selected, and the coordinates (POS X,POSY) of the point having chromaticity CIE x n、CIE yn are determined as follows.
Referring to fig. 6, which illustrates a case where a point determined from the color component measurement value R S'、GS'、BS' is located inside the boundary of the color image table 115, chromaticity CIE x n、CIE yn may be obtained based on the pixel value (CIE x n,1,CIE yn) of the point (POS X1,POSY1).
On the other hand, referring to fig. 7, the cases outside the boundaries are respectively shown. Since there is no pixel value of the point (POS X2,POSY2), the chromaticity CIEx, CIEy cannot be obtained. For points (POS X2,POSY2) where no pixel values are present, the pixel values may be obtained using the slope a and the y-axis intercept b calculated for at least a portion or all of the correlated color temperature interval. As described above, the plurality of points belonging to the same correlated color temperature section are located substantially on the isothermal line y=ax+b representing the same color temperature. If a point (POS X2,POSY2) located outside the boundary of the color image table 115 is located on one of a plurality of isothermal lines defined according to the slope a and the y-axis intercept b (or near the Wen Zhixian), the chromaticity CIEx, CIEy may be obtained from a point (POS X3,POSY3) where the isothermal lines intersect the boundary of the color image table 115.
In contrast, a point (POS X2,POSY2) located outside the boundary of the color image table 115 sometimes does not lie on any one of the isothermal lines defined according to the slope a and the y-axis intercept b. In this case, for example, an isothermal line passing through the upper part of the point (POS X2,POSY2) and an isothermal line passing through the lower part may be selected. The chromaticity CIEx, CIEy may be obtained based on any point between the two points where the selected isothermal lines intersect the boundary of the color image table 115, such as the intermediate point (POS X3,POSY3).
Referring again to fig. 5, the illuminance calculating part 220 calculates an illuminance LUX ' based on the ambient light using the acquired correlated color temperature CCT ' and the measured plurality of color component measurement values R S'、GS'、BS '. According to the correlated color temperature-illuminance formula Y '=f (X'), illuminance based on ambient light is expressed as follows.
The above description of the present invention is merely for illustration, and it should be understood by those skilled in the art that the present invention can be easily modified into other specific embodiments without changing the technical spirit or essential features of the present invention. The above-described embodiments are therefore illustrative in all respects, rather than limiting, of the present invention.
The scope of the invention should be indicated by the appended claims rather than by the foregoing detailed description, and all changes and modifications that come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Claims (10)
1. An illuminance measuring device for measuring illuminance using a color image table, the illuminance measuring device comprising:
A color image table representing a plurality of color component measurements and chromaticity associated with a correlated color temperature of the light source;
a color sensor that receives ambient light and outputs a plurality of color component measurements of the ambient light;
a color temperature calculation unit that obtains correlated color temperatures of the ambient light corresponding to a plurality of color component measurement values of the ambient light from the color image table;
An illuminance calculating part for inputting the obtained correlated color temperature of the ambient light into a correlated color temperature-
Calculating an illuminance based on the ambient light, wherein the correlated color temperature-illuminance formula is determined from a relationship between a value obtained by dividing a sum of a plurality of color component measurement values of the light source by an illuminance based on the light source and a correlated color temperature of the light source;
the color image table has a two-dimensional coordinate system associated with a plurality of color components of the light source, the chromaticity being a pixel value of a point determined based on the coordinate system;
The pixel values are RGB color values, and the chromaticity is a color value with respect to at least two color components of the RGB color values;
the color temperature calculating section obtains the chromaticity based on the pixel value of the point determined by the horizontal distance and the vertical distance,
The horizontal distance is a horizontal distance from an origin determined by a value obtained by dividing a first color component measurement value selected from the plurality of color components of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light,
The vertical distance is a vertical distance from the origin determined by a value obtained by dividing a second color component measurement value selected from the plurality of color components of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light.
2. An illuminance measurement device according to claim 1, wherein,
The correlated color temperature-illuminance formula is a polynomial representing a trend line determined by representing a correlated color temperature of the light source as coordinates on a first axis on a two-dimensional coordinate system and a value obtained by dividing a sum of a plurality of color component measurement values of the light source by illuminance based on the light source as coordinates on a second axis.
3. An illuminance measurement device according to claim 1, wherein,
A plurality of color component measurements of the light source and a plurality of color component measurements of the ambient light associated with a correlated color temperature of the light source are generated by the color sensor, a chromaticity of the light source and an illuminance of the light source are generated by a light source color/illuminance meter,
The plurality of color component measurements of the light source and the chromaticity of the light source are associated with a color temperature of the light source.
4. An illuminance measurement device according to claim 1, wherein,
The point is determined based on a horizontal distance from an origin determined by dividing a first color component measurement value selected from a plurality of color components of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source,
The vertical distance is a vertical distance from the origin determined by a value obtained by dividing a second color component measurement value selected from a plurality of color components of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source.
5. An illuminance measurement device according to claim 4, wherein,
The color image table is generated by interpolating the pixel values.
6. An illuminance measurement method for measuring illuminance using a color image table, the illuminance measurement method comprising:
The color sensor outputs a plurality of color component measurements of the ambient light;
obtaining a correlated color temperature of the ambient light corresponding to a plurality of color component measurements of the ambient light from the color image table representing a plurality of color component measurements and chromaticity of the light source associated with the correlated color temperature of the light source;
Inputting the acquired correlated color temperature of the ambient light into a correlated color temperature-illuminance formula, and calculating the illuminance of the ambient light, wherein the correlated color temperature-illuminance formula is determined according to the relation between the sum of a plurality of color component measurement values of the light source divided by a value obtained based on the illuminance of the light source and the correlated color temperature of the light source;
the color image table has a two-dimensional coordinate system associated with a plurality of color components of the light source, the chromaticity being a pixel value of a point determined based on the coordinate system;
The pixel values are RGB color values, and the chromaticity is a color value with respect to at least two color components of the RGB color values;
The step of obtaining the correlated color temperature of the ambient light corresponding to the plurality of color component measurements of the ambient light from a color image table representing the plurality of color component measurements and chromaticity of the light source associated with the correlated color temperature of the light source comprises:
Calculating a horizontal distance from an origin determined by dividing a first color component measurement value selected from the plurality of color components of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light;
Calculating a vertical distance, which is a vertical distance from the origin determined by dividing a second color component measurement value selected from a plurality of color components of the ambient light by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the ambient light;
acquiring the chromaticity based on pixel values of points determined according to the horizontal distance and the vertical distance;
And calculating the correlated color temperature of the ambient light by using the chromaticity.
7. An illuminance measurement method according to claim 6, wherein,
The color image table includes pixel values of points determined according to horizontal distances and vertical distances,
The horizontal distance is a horizontal distance from an origin determined by a value obtained by dividing a first color component measurement value selected from a plurality of color components of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source,
The vertical distance is a vertical distance from the origin determined by a value obtained by dividing a second color component measurement value selected from a plurality of color components of the light source by a sum of two or more color component measurement values selected from the plurality of color component measurement values of the light source.
8. An illuminance measurement method according to claim 6, wherein,
The color image table is generated by interpolating the pixel values.
9. An illuminance measurement method according to claim 6, wherein,
The correlated color temperature-illuminance formula is a polynomial representing a trend line determined by representing a correlated color temperature of the light source as coordinates on a first axis on a two-dimensional coordinate system and a value obtained by dividing a sum of a plurality of color component measurement values of the light source by illuminance based on the light source as coordinates on a second axis.
10. An illuminance measurement method according to claim 6, wherein,
A plurality of color component measurements of the light source and a plurality of color component measurements of the ambient light associated with a correlated color temperature of the light source are generated by the color sensor, a chromaticity of the light source and an illuminance of the light source are generated by a light source color/illuminance meter,
The plurality of color component measurements of the light source and the chromaticity of the light source are correlated by the correlated color temperature of the light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011317004.4A CN112484847B (en) | 2020-11-20 | 2020-11-20 | Illuminance measuring device and illuminance measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011317004.4A CN112484847B (en) | 2020-11-20 | 2020-11-20 | Illuminance measuring device and illuminance measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112484847A CN112484847A (en) | 2021-03-12 |
| CN112484847B true CN112484847B (en) | 2024-08-02 |
Family
ID=74932952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011317004.4A Active CN112484847B (en) | 2020-11-20 | 2020-11-20 | Illuminance measuring device and illuminance measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112484847B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124300A (en) * | 2021-11-12 | 2023-05-16 | 武汉市聚芯微电子有限责任公司 | A data processing method, device, equipment and storage medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251554A (en) * | 2015-02-09 | 2017-10-13 | （株）奈克斯其布斯 | Color table generation device, camera image correction/control device and method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5556089B2 (en) * | 2009-09-01 | 2014-07-23 | セイコーエプソン株式会社 | Image display device and image adjustment method |
| JP5665147B2 (en) * | 2010-07-21 | 2015-02-04 | Ｎｅｃディスプレイソリューションズ株式会社 | Chromaticity correction circuit, display device, and chromaticity correction method |
| CN206431606U (en) * | 2016-11-24 | 2017-08-22 | 德为显示科技股份有限公司 | A kind of digital medical diagosis room |
| US10267677B1 (en) * | 2018-04-03 | 2019-04-23 | Microsoft Technology Licensing, Llc | Calibrated brightness estimation using ambient color sensors |
| CN109801603A (en) * | 2019-03-12 | 2019-05-24 | 徐丽萍 | The method for adjusting liquid crystal display colour temperature according to the illumination of external ambient light |
-
2020
- 2020-11-20 CN CN202011317004.4A patent/CN112484847B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251554A (en) * | 2015-02-09 | 2017-10-13 | （株）奈克斯其布斯 | Color table generation device, camera image correction/control device and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112484847A (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100918749B1 (en) | Method and device of obtaining a color temperature point | |
| US11284013B2 (en) | Color detection method and terminal | |
| CN111953955B (en) | White balance compensation method, device and electronic device | |
| KR100441595B1 (en) | Color conversion system and method using the same | |
| US8169504B2 (en) | Image processing device and image processing method | |
| US10929078B2 (en) | Electronic apparatus for generating screen image to be displayed by display apparatus and control method thereof | |
| CN101163253A (en) | Method and device for searching new color temperature point | |
| JP2008015706A (en) | Image processor | |
| US20100085480A1 (en) | Image processor, and image processing method | |
| CN107945770A (en) | Ambient light intensity detection method, device, storage medium and electronic equipment | |
| CN106448525A (en) | System and method for measuring color uniformity of medical display | |
| CN113316711A (en) | Method and apparatus for estimating ambient light | |
| CN112484847B (en) | Illuminance measuring device and illuminance measuring method | |
| KR101680446B1 (en) | Creation device for color table, correction and control device for camera image and method thereof | |
| CN112492287A (en) | Electronic device and color temperature correction method of image | |
| JP2016001108A (en) | Colorimetric system | |
| CN114339094B (en) | Image processing method, device, storage medium and terminal | |
| JP5058532B2 (en) | Image display system and image display method | |
| Blankenbach | Color | |
| KR20220157617A (en) | Method, device, and computer-readable medium for deriving colormetry reference color | |
| WO2015146084A1 (en) | Pos terminal, information processing device, white balance adjustment method, and recording medium | |
| Hirobe et al. | Characteristics of Background Color Shifts Caused by Optical See-Through Head-Mounted Displays. | |
| WO2020008543A1 (en) | Measurement method, measurement system, display device, and computer program | |
| JP5496382B2 (en) | Display device color adjustment system | |
| US20220012521A1 (en) | System for luminance qualified chromaticity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Country or region after: China Address after: 19th Floor, Hongruan Building, No. 392 Binxing Road, Changhe Street, Binjiang District, Hangzhou City, Zhejiang Province 310000 Applicant after: Rainbow Software Co.,Ltd. Address before: 310012 22nd and 23rd Floors of Building A, Paradise Software Park, No. 3 Xidoumen Road, Xihu District, Hangzhou City, Zhejiang Province Applicant before: Rainbow Software Co.,Ltd. Country or region before: China |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |