TWI424151B - Method and system for chromaticity measurement using light source assembly - Google Patents

Description

Chroma measurement method and system for combined light source

The present invention relates to a chromaticity measurement method and system for a combined light source, and more particularly to a chromaticity measurement method and system for simulating a suitable sub-light source using a combined light source for measurement.

The measurement method of the reflection chromaticity of an object can be divided into two different techniques, one of which is the spectroscopic measurement chromaticity. In general, the technique of spectroscopic colorimetric measurement uses a spectrometer to obtain a spectrum of reflected light from an object, and then calculates its chromaticity. For example, by using a grating (Grating) with a one-dimensional image detector, the chromaticity of a single point of the object can be obtained; if a two-dimensional image detector is used, the chromaticity of a certain dimension of the object can be obtained, if Moving the object to scan, you can get a two-dimensional measurement of the entire object, also known as Spectral-Imager. However, with the "image spectrometer", although a two-dimensional object chromaticity can be obtained, it is still necessary to cooperate with the scanning movement of the object, so that the measurement speed is still not fast enough, and it is usually expensive, which is another disadvantage.

Another method for measuring the chromaticity of an object is to use the technique of measuring the chromaticity by a filter, and using the three-color Color Matching Function to find the Tri-Stimulus Values, and then calculate the color. Degree value. If a single-point photodetector is used, the single-point object chromaticity can be measured; if an image detector is used, the two-dimensional chromaticity of the object can be measured. However, the biggest disadvantage of using the filter technology is that the transmittance of the filter (Transmittance) T(x) must match the response function (Spectrum-Response) R(λ) of the photosensor. Especially when the response function of the image detector shows the individual difference of each image detector due to the process relationship, it is easy to cause measurement error, so it is very difficult to match the fully matched visual effect function, so that the measurement chromaticity is made. The accuracy is reduced. However, the biggest advantage of filter-type measurement is that the price is low and the measurement speed is faster.

In addition, in the measurement system of a general combined light source, only the light source projected by the combined light source is simulated as a standard light source. For example, in the case of a combined light source of a light-emitting diode (LED), if a standard light source is to be simulated, the combined light source must contain a considerable number of LEDs to reduce the analog error and approach the true standard light source. However, in addition to the problem of analog error, the conventional combined light source measurement system may suffer from uneven light reception or heat dissipation due to the excessive number of LEDs.

In view of the fact that it is difficult to combine a limited number of LEDs to be completely equal to a standard light source, there is usually a certain degree of error therebetween. The invention further discloses a method for simulating a standard light source by using a plurality of sub-light sources to combine a more accurate spectrum of the light source and obtain a color measurement result of the object to be tested. At the same time, the present invention will propose a new color temperature adjustable method, which can achieve the accuracy of the spectroscopic color measurement technology, and can achieve the low price of the filter type color measurement technology, and the measurement speed can also be compared with the filter. Mirror-based colorimetry is faster.

The invention discloses a method and a system for measuring the chromaticity of a combined light source, and adjusting the brightness of the plurality of illuminants in the combined light source can measure the chromaticity of the object reflection, and at the same time, the result of the appropriate calculation measurement can be accurately obtained. The chromaticity coordinates of the object.

The invention provides a method for measuring the chromaticity of a combined light source, the method comprising the steps of: providing a plurality of energy conversion members, each energy conversion member for converting an electrical energy into a light energy, and the plurality of energy conversion members The generated light energy has different center wavelengths; adjusting the luminous intensity of the plurality of energy conversion members, sequentially generating a plurality of sub-light sources, each sub-light source being classified into a first group or a second group; Illuminating the plurality of sub-light sources on one surface of the object to be tested respectively; respectively, extracting the plurality of sub-light sources after the reflection, thereby generating a plurality of image measurement values, wherein the sub-light source corresponding to the image measurement value belongs to the first group In the group, the image measurement values are classified into a third group. When the sub-light sources corresponding to the image measurement values belong to the second group, the image measurement values are classified into a fourth group; The group is subtracted from the plurality of image measurements in the fourth group to generate a plurality of standard measurements.

In an exemplary embodiment, in the chromaticity measuring method of the combined light source of the present invention, wherein the plurality of energy conversion members correspond to a weight group, the weight group has a plurality of weights, and each weight corresponds to the weight One of the plurality of energy conversion members, the adjustment weight is used to adjust the luminous intensity of the corresponding energy conversion member. Here, the present invention further adjusts the weight group such that the plurality of energy conversion members simulate one of the plurality of sub-light sources. Further, the weight group indicates the most appropriate luminous intensity of each of the energy conversion members when the plurality of energy conversion members simulate one of the plurality of sub-light sources.

In another exemplary embodiment, the chromaticity measurement method of the combined light source of the present invention further generates a chromaticity coordinate indicating one of the objects to be tested based on a plurality of standard measurement values that have been obtained. Here, the plurality of standard measurements obtained according to the method may be a set of tristimulus values and the chromaticity coordinates are generated from the tristimulus values. In addition, the chromaticity measurement method of the combined light source can separately capture the image of the reflected sub-light source to generate two-dimensional image measurement values.

In addition, the present invention further discloses a chromaticity measuring system for a combined light source, which can adjust the brightness of a plurality of illuminants in the combined light source to measure the chromaticity of the object, and at the same time, the result of appropriate calculation and measurement can be accurately obtained. The chromaticity coordinates of the object.

The invention provides a chromaticity measuring system for a combined light source, comprising a plurality of energy conversion members, a control unit, an image detector and a processing unit. Each of the energy conversion members is configured to convert an electrical energy into a light energy, and the light energy generated by the plurality of energy conversion members has different center wavelengths. The control unit is coupled to the plurality of energy conversion members for adjusting the illumination intensity of the plurality of energy conversion members, and driving the plurality of energy conversion members to sequentially illuminate the plurality of sub-light sources on one surface of the object to be tested. A sub-light source is classified into a first group or a second group. The image detector separately captures the reflected sub-light source to generate a plurality of image measurements. The processing unit is coupled to the image detector to subtract image measurement values from a third group and a fourth group to generate a plurality of standard measurement values. Wherein, when the sub-light source corresponding to the image measurement value belongs to the first group, the image measurement value is classified into the third group, and when the sub-light source corresponding to the image measurement value belongs to the second group, the image measurement value is Classified in the fourth group.

In an exemplary embodiment, the processing unit of the present invention further generates a chromaticity coordinate indicating one of the objects to be tested according to the plurality of standard measurement values that have been obtained. Here, the plurality of standard measurements obtained according to the method may be a set of tristimulus values and the chromaticity coordinates are generated from the tristimulus values. In addition, the image detector of the present invention can separately capture the two-dimensional image of the reflected sub-light source to generate two-dimensional image measurement values.

Therefore, the colorimetric measurement system of the combined light source of the present invention simulates a standard light source by using a plurality of sub-light sources, and calculates a plurality of image measurement values by the processing unit, thereby obtaining a more accurate color measurement of the object to be tested. result. In addition, the present invention further utilizes a two-dimensional image detector to filter the chromaticity of the filter, and the correction parameter can be used to calculate the tristimulus value, thereby generating a chromaticity coordinate, so that the measurement speed is compared with the Knowing the filter type measurement color technology is fast.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Referring to FIG. 1, FIG. 1 is a functional block diagram of a chromaticity measuring system of a combined light source according to an exemplary embodiment of the present invention. As shown in FIG. 1, the colorimetric measurement system 1 of the combined light source of the present invention comprises an energy conversion member group 10, a control unit 12, an image detector 14, a processing unit 16, and a storage unit 18. The energy conversion component group 10 is coupled to the control unit 12, and the processing unit 16 is coupled to the image detector 14 and the storage unit 18, respectively. The elements in the chromaticity measuring system 1 of the combined light source are separately described below.

The energy conversion member group 10 has a plurality of energy conversion members, wherein each of the energy conversion members is configured to convert an electrical energy into a light energy, and the light energy generated by the plurality of energy conversion members has different center wavelengths and will be generated The light can be projected onto the surface 20 of the object 2 to be tested. In practice, in order to achieve a sufficiently accurate measurement, the energy conversion member group 10 may include a plurality of light emitting diodes (LEDs), and the center wavelength of the light energy generated by the LEDs must be sufficient to cover the entire visible light region, for example, From 380nm to 730nm. In addition, the spacing between the above center wavelengths should not be too far, so that it is sufficient to accurately simulate and combine the desired optical spectrum.

The control unit 12 is configured to adjust the luminous intensity of each of the energy conversion members in the energy conversion member group 10, and drive the energy conversion member group 10 to sequentially project a plurality of sub-light sources on the surface 20 of the object to be tested 2, wherein each of the sub-light sources Classified as a first group or a second group. In detail, the energy conversion members correspond to a weight group including a plurality of weights, and each weight corresponds to one of the energy conversion members, for example, each LED has its corresponding weight. The control unit 12 adjusts the weight to adjust the luminous intensity of the corresponding energy conversion member. For example, the control unit 12 can be a pulse width modulation (PWM) controller. The invention does not limit the type of the control unit 12, as long as the brightness of the light emitting diode can be adjusted. Within the scope, those having ordinary skill in the art can replace the appropriate control unit 12 by themselves.

In the above, in practice, when combining the required sub-light sources, it is necessary to accurately derive the brightness required for each LED, and then the control unit 12 adjusts the illuminating weight of each LED according to the derivation result, so that the energy conversion Each of the LEDs in component set 10 provides the most appropriate illumination intensity. Since the brightness of each LED in the energy conversion member group 10 should be at least 0, if the optimal weight derived by each LED is not a negative number, the control unit 12 can control the energy conversion member group according to the illumination weight value. Each of the LEDs in 10 combines the desired sub-light source.

However, if the optimal weight derived by some LEDs is negative, the required sub-light source must be classified into the first group with the best weighted positive LED, and the best weight is negative. The LEDs combined with the desired sub-light source are classified in the second group. In more detail, the control unit 12 simulates six sub-light sources, and includes the sub-light sources S _x ⁺ , S _y ^{+ ,} and S _z ⁺ simulated by the LEDs having the best positive value in the first group. The second group contains the sub-light sources S _x ^- , S _y ^- and S _z ^- simulated by the LEDs with the best weight negative.

The image detector 14 respectively captures the reflected sub-light source to generate a plurality of image measurements. Wherein, when the sub-light source corresponding to the image measurement value belongs to the first group, the image measurement value is classified into the third group, and when the sub-light source corresponding to the image measurement value belongs to the second group, the image measurement value is Classified in the fourth group. In other words, when the image detector 14 receives the sub-light sources of different groups, the corresponding image measurement values also need to be correspondingly classified. In practice, the image detector 14 respectively captures image measurement values corresponding to the reflected six sub-light sources, wherein the third group includes three image measurement values corresponding to the first group X' ⁺ , Y' ⁺ And Z' ⁺ , the fourth group contains three image measurement values X' ^- , Y' ^- and Z' ^- corresponding to the second group. The image measurements should correspond approximately to the XYZ color space of the CIE.

In addition, since the chromaticity reflected by the surface 20 of the object 2 is generally changed according to the angle of the incident light and the angle of the image detector/observer, the image detector 14 and the energy conversion member 10 are disposed. Must be in accordance with CIE standards (such as 45/0, 0/45, d/0, 0/d). For example, the standard 45/0 means that the illumination source is incident at 45 ± 5° from the surface of the vertical object, while the observer angle is located near 0° of the surface of the vertical object, but not exceeding 10°. Those having ordinary knowledge in the technical field of the present invention should be able to understand, and therefore will not be described herein.

Processing unit 16 subtracts the image measurements in the third group from the fourth group to generate standard measurements. In practice, the image measurement value X' ⁺ in the third group is subtracted from the image measurement value X' ^- in the fourth group to obtain a standard measurement value X; the image measurement value Y in the third group ⁺ subtracted from the image measurement value Y' ^- in the fourth group to obtain the standard measurement value Y; the image measurement value Z' ⁺ in the third group and the image measurement value Z' in the fourth group ^- phase Subtraction, the standard measurement value Z is obtained. Further, these standard measurements X, Y, Z are a set of tristimulus values, and the processing unit 16 can generate a chromaticity coordinate of the surface 20 of the test object 2 based on the set of tristimulus values.

The storage unit 18 is configured to store a plurality of calibration parameters, store image measurement values, or chromaticity coordinates after being processed by the processing unit 16. In practice, it can be used in a non-volatile memory (eg, EEPROM) for actual measurement.

However, the energy conversion member group 10 of the present invention can not only project the sub-light source to a point on the surface 20, but also project the sub-light source onto an area on the surface 20, and receive the above area by the image detector 14. A two-dimensional picture, and the processing unit 16 can calculate a tristimulus value therefrom to quickly and accurately generate a color measurement result of the object to be tested. The following is a description of the chromaticity measurement method of the combined light source of the present invention.

Referring to FIG. 1 and FIG. 2, FIG. 2 is a flow chart showing a method for measuring the chromaticity of a combined light source according to an exemplary embodiment of the present invention. In step S30, the energy conversion member group 10 provides a plurality of energy conversion members, each of the energy conversion members is configured to convert an electrical energy into a light energy, and the light energy generated by the plurality of energy conversion members has different center wavelengths. . In practice, the energy conversion member group 10 of the present invention can project the sub-light source onto the two-dimensional surface 20 of the object 2 to be tested.

In step S31, a user can adjust the luminous intensity of each energy conversion member in the energy conversion member group 10 through the control unit 12, so that the energy conversion member group 10 combines a plurality of sub-light sources. In practice, S _x (x _n , y _n , λ) ⁺ , S _y (x _n , y _n , λ) ⁺ and S _z (x _n , y _n , λ) ⁺ represent the first group, respectively. The distribution of the sub-light sources on the surface 20, likewise, the sub-light sources in the second group can be expressed as S _x (x _n , y _n , λ) ^- , S _y (x _n , y _n , λ) ^- and S _z (x _n , y _n , λ) ^- . The user can adjust the brightness of each LED in the energy conversion member group 10 through the control unit 12 to just enough to simulate a spectrum such as S _x (x _n , y _n , λ) ⁺ . Next, in step S32, the control unit 12 drives the energy conversion member group 10 to project the sub-light source onto an area on the surface 20 of the object 2 to be tested.

In step S33, the image detector 14 respectively captures the reflected sub-light source to generate a plurality of image measurement values. In practice, the image detector 14 can be a CCD detector, and the image measurement value can be imaged into the image detector 14 via a lens, and the image measurement values can be divided into two groups. The three image measurements X'(x _n , y _n ) ⁺ , Y'(x _n , y _n ) ⁺ and Z' included in the third group at the specified position (x _n , y _n ) of the surface 20 (x _n , y _n ) ⁺ , likewise, three image measurements X'(x _n , y _n ) ^- , Y' included in the specified position (x _n , y _n ) of the surface 20 in the fourth group (x _n , y _n ) ^- and Z'(x _n , y _n ) ^- .

In detail, taking the image measurement of the third group as an example, X'(x _n , y _n ) ⁺ , Y'(x _n , y _n ) ⁺ and Z'(x _n , y _n ) ⁺ are respectively :

X'(x _n , y _n ) ⁺ = ∫S _x (x _n , y _n , λ) ⁺ R(x _n , y _n , λ)D(x _n , y _n , λ)dλ,

Y'(x _n , y _n ) ⁺ = ∫S _y (x _n , y _n , λ) ⁺ R(x _n , y _n , λ)D(x _n , y _n , λ)dλ,

Z'(x _n , y _n ) ⁺ = ∫S _z (x _n , y _n , λ) ⁺ R(x _n , y _n , λ)D(x _n , y _n , λ)dλ,

If the sub-light source illuminates a region on the surface 20, S _x (x _n , y _n , λ) ⁺ , S _y (x _n , y _n , λ) ⁺ and S _z (x _n , y _n , λ) ⁺ Respectively, the distribution of the three sub-light sources on a surface of the surface 20, R(x _n , y _n , λ) is the reflection spectrum of the specified position (x _n , y _n ) of the two-dimensional picture, D(x _n , y _n , λ) is a response function of the image detector 14 when it is at a specified position (x _n , y _n ) of the two-dimensional picture.

In step S34, the processing unit 16 subtracts the image measurement values in the third group and the fourth group, thereby generating a plurality of standard measurement values. Here, the storage unit 18 can store three additional correction parameters respectively C _x (x _n , y _n ), C _y (x _n , y _n ) and C _z (x _n , y _n ), and the image measurement value can be transmitted through These correction parameters are normalized or corrected. For example, the correction parameters C _x (x _n , y _n ), C _y (x _n , y _n ), and C _z (x _n , y _n ) can be obtained from a standard slice using known chromaticity. In detail, the present invention can utilize a very uniform standard piece R _s (λ) of known chromaticity as a basis for correction, since the standard piece has the same reflection coefficient at each position, so its reflection coefficient R is only Is a function of the wavelength λ. When the standard piece is placed in the position of the object 2 in FIG. 1, the six standard sub-light sources S _x (x _n , y _n , λ) ⁺ , S _y (x _n , y _n , λ) are utilized. ⁺ , S _z (x _n , y _n , λ) ⁺ and S _x (x _n , y _n , λ) ^- , S _y (x _n , y _n , λ) ^- , S _z (x _n , y _n , λ) ^- sequential illumination, obtained by the response function D (x _n , y _n , λ) known by the image detector 14 to obtain six measurements, respectively:

X _c '(x _n , y _n ) ⁺ =∫S _x (x _n , y _n , λ) ⁺ R _s (λ)D(x _n , y _n , λ)dλ,

Y _c '(x _n , y _n ) ⁺ = ∫S _y (x _n , y _n , λ) ⁺ R _s (λ)D(x _n , y _n , λ)dλ,

Z _c '(x _n , y _n ) ⁺ = ∫S _z (x _n , y _n , λ) ⁺ R _s (λ)D(x _n , y _n , λ)dλ,

X _c '(x _n , y _n ) ^- = ∫S _x (x _n , y _n , λ) ^- R _s (λ)D(x _n , y _n , λ)dλ,

Y _c '(x _n , y _n ) ^- = ∫S _y (x _n , y _n , λ) ^- R _s (λ)D(x _n , y _n , λ)dλ,

Z _c '(x _n , y _n ) ^- = ∫S _z (x _n , y _n , λ) ^- R _s (λ) D (x _n , y _n , λ) dλ.

Here, X _c '(x _n , y _n ) ⁺ and X _c '(x _n , y _n ) ^- can be combined to form X _c '(x _n , y _n ), Y _c '(x _n , y _n ) ⁺ and Y _c '(x _n , y _n ) ^- can be combined to Y _c '(x _n , y _n ), Z _c '(x _n , y _n ) ⁺ and Z _c '(x _n , y _n ) ^- Z _c '(x _n , y _n ) can be combined as follows:

X _c '(x _n , y _n )=X _c '(x _n , y _n ) ⁺ -X _c '(x _n , y _n ) ^- ,

Y _c '(x _n , y _n )=Y _c '(x _n , y _n ) ⁺ -Y _c '(x _n , y _n ) ^- ,

Z _c '(x _n , y _n )=Z _c '(x _n , y _n ) ⁺ -Z _c '(x _n , y _n ) ^- .

However, according to the CIE regulations, if R _s (λ) is known, the three stimulus values X _s (x _n , y _n ), Y _s (x _n , y _n ), Z _s (x _n , y _n ) can be derived. also:

X _s (x _n , y _n )=X _c '(x _n , y _n )‧Cx(x _n , y _n ),

Y _s (x _n , y _n )=Y _c '(x _n , y _n )‧C _y (x _n , y _n ),

Z _s (x _n , y _n )=Z _c '(x _n , y _n )‧C _z (x _n , y _n ).

Therefore, individual correction parameters can be obtained separately:

C _x (x _n , y _n )=X _s /X _c '(x _n , y _n ),

C _y (x _n , y _n )=Y _s /Y _c '(x _n ,y _n ),

C _z (x _n , y _n )=Z _s /Z _c '(x _n , y _n ).

In step S35, the processing unit 16 generates a chromaticity coordinate of the surface 20 of the object to be tested 2 according to the obtained standard measurement value, wherein the standard measurement values are a set of tristimulus values. For example, the processing unit 16 can calculate the chromaticity coordinates ( x , y ) at the specified position (x _n , y _n ) according to the tristimulus values, wherein:

x (x _n , y _n )=X(x _n , y _n )/[X(x _n , y _n )+Y(x _n , y _n )+Z(x _n , y _n )], and

y (x _n , y _n )=Y(x _n , y _n )/[X(x _n , y _n )+Y(x _n , y _n )+Z(x _n , y _n )].

Further, the X(x _n , y _n ) can be obtained by the following formula:

X(x _n , y _n )=X'(x _n , y _n )‧C _x (x _n , y _n ),

Where X'(x _n , y _n )=X'(x _n ,y _n ) ⁺ -X'(x _n ,y _n ) ^- ,

Similarly, Y(x _n , y _n ), Z(x _n , y _n ) can be obtained, and will not be described herein.

Thereby, compared with the conventional colorimeter, the present invention can overcome the unsatisfactory state when the optimal illuminating weight is negative, and quickly obtain the precise chromaticity coordinates of the surface 20 of the object 2 to be tested.

In summary, the method and system for measuring the chromaticity of the combined light source of the present invention can be applied to the consistency check or color separation operation of materials such as pigments, textiles, solar cells, etc., and can be applied in the future. In the electronic paper manufacturing industry. In addition, the present invention uses a two-dimensional image detector to filter the chromaticity technique, and the correction parameters can be used to calculate the tristimulus values, thereby generating chromaticity coordinates, and improving the previous use of filter technology or Inaccurate camera chromaticity and the use of images are problems with insufficient spectrometer color metrics. In addition, through the combined sub-light source technology disclosed by the present invention, the control unit can be used to combine a more accurate sub-light source spectrum, and can overcome the undesired state when the optimal illuminance weight is negative, so as to obtain a more accurate test. The color measurement results of the object.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

1. . . Chromaticity measurement system for combined light source

10. . . Energy conversion component group

12. . . control unit

14. . . Image detector

16. . . Processing unit

18. . . Storage unit

2. . . Analyte

20. . . Surface of the object to be tested

S30~S35. . . Process step

1 is a functional block diagram of a chromaticity measurement system of a combined light source in accordance with an exemplary embodiment of the present invention.

2 is a flow chart showing a method of chromaticity measurement of a combined light source according to an exemplary embodiment of the present invention.

1. . . Chromaticity measurement system for combined light source

10. . . Energy conversion component group

12. . . control unit

14. . . Image detector

16. . . Processing unit

18. . . Storage unit

2. . . Analyte

20. . . Surface of the object to be tested

Claims (15)

A method for measuring a chromaticity of a combined light source, the method comprising the steps of: providing a plurality of energy conversion members, each of the energy conversion members for converting an electrical energy into a light energy, and the energy conversion members generate the The light energy has different center wavelengths; adjusting the luminous intensity of the energy conversion members, sequentially generating a plurality of sub-light sources, each of the sub-light sources being classified into a first group or a second group, wherein the energy The conversion component corresponds to a weight group, the weight group has a plurality of weights, each of the weights corresponds to one of the energy conversion components, and the weight is adjusted to adjust the luminous intensity of the corresponding energy conversion component And respectively illuminating the sub-light sources on one surface of the object to be tested; respectively, extracting the reflected sub-light sources to generate a plurality of image measurement values, wherein the sub-light source corresponding to the image measurement value belongs to the In the first group, the image measurement value is classified into a third group, and when the sub-light source corresponding to the image measurement value belongs to the second group, the image measurement value is classified into The fourth group; and a third group of the plurality of images with the measured value of the fourth group are subtracted so as to generate a plurality of standard measurements. The chromaticity measuring method of the combined light source according to claim 1, wherein the step of sequentially generating the complex array sub-light source in the step of adjusting the luminous intensity of the energy conversion members further comprises the following steps: adjusting the weight a set of values that cause the energy conversion members to simulate one of the sub-light sources. The chromaticity measuring method of the combined light source according to claim 1, wherein the weight group indicates that the energy conversion members simulate the sub-light sources For a moment, the most appropriate luminous intensity of each of the energy conversion members. The chromaticity measuring method of the combined light source according to claim 1, further comprising the step of: generating, according to the standard measurement values, a chromaticity coordinate of the surface of the object to be tested, wherein the standard measurement values A set of tristimulus values. The chromaticity measuring method of the combined light source according to claim 1, wherein the light energy generated by the energy conversion members has a central wavelength range of at least 380 nm to 730 nm. The chromaticity measuring method of the combined light source according to claim 1, wherein the step of respectively generating the reflected plurality of sub-light sources according to the step of generating a plurality of image measurement values further comprises the following steps: respectively The two-dimensional images of the reflected sub-light sources are captured to generate the two-dimensional image measurement values. The chromaticity measuring method of the combined light source according to claim 1, further comprising: correcting the standard measured values by using a plurality of calibration parameters. A colorimetric measurement system for a combined light source, comprising: a plurality of energy conversion members, each of the energy conversion members for converting an electrical energy into a light energy, and the light energy generated by the energy conversion members has different a central wavelength; a control unit coupled to the energy conversion members for adjusting the luminous intensity of the energy conversion members, and driving the energy conversion members to sequentially illuminate the plurality of sub-light sources on one surface of the object to be tested, each The sub-light source is classified into a first group or a second group; an image detector respectively extracts the reflected sub-light sources to generate a plurality of image measurement values, and the image measurement values are obtained Department is classified as one a third group or a fourth group; a processing unit coupled to the image detector to subtract the image measurements from the third group and the fourth group to generate a plurality of criteria a measured value, wherein, when the sub-light source corresponding to the image measurement value belongs to the first group, the image measurement value is classified into the third group, and the sub-light source corresponding to the image measurement value When belonging to the second group, the image measurement value is classified into the fourth group. The chromaticity measuring system of the combined light source according to claim 8, wherein the energy conversion members correspond to a weight group, the weight group having a plurality of weights, each of the weights corresponding to the energy One of the conversion members, the control unit adjusting the weight to adjust the luminous intensity of the corresponding energy conversion member. The chromaticity measuring system of the combined light source according to claim 9, wherein the control unit adjusts the weight group such that the energy conversion members simulate one of the sub-light sources. The chromaticity measuring system of the combined light source according to claim 9, wherein the weight group indicates the most appropriate one of each of the energy conversion members when the energy conversion members simulate one of the sub-light sources light intensity. The chromaticity measuring system of the combined light source according to claim 9, wherein the standard measurement values are a set of tristimulus values, and the processing unit is further generated according to the set of three stimuli values in the object to be tested. A chromaticity coordinate of the surface. The chromaticity measuring system of the combined light source according to claim 8, wherein the light energy generated by the energy conversion members has a central wavelength range of at least 380 nm to 730 nm. The colorimetric weighing system of the combined light source according to claim 8 , wherein the image detector respectively captures the two-dimensional images of the reflected sub-light sources, thereby generating the two-dimensional images Measurements. The chromaticity measuring system of the combined light source according to claim 8, wherein the processing unit further comprises correcting the standard measured values by using a plurality of calibration parameters.