TWI385363B - Method of constructing light-measuring look-up table, light-measuring method, and light-measuring system - Google Patents

Description

Method for constructing light source measurement comparison table, light source measurement method and light source measurement system

The present invention relates to a light source measuring method and a light source measuring system, and more particularly to a light source measuring method and a light source measuring system using a look-up table constructed based on an optical spectrum model.

In the prior art, for the measurement of a light source to be tested, according to the provisions of the International Association for Lighting (CIE) in 1931, the light source to be measured is measured by a standard light source measuring device to obtain The tri-stimulus value of the light source to be measured is calculated by calculating the color coordinates. However, it is necessary to produce three standard color-matching functions that are fully compliant with CIE 1931. , and The filter is very difficult. Moreover, actually determining the actual color matching function of the light with respect to the light source measuring device requires that the Responsivity R(λ) of the photoreceptor is not flat, that is, the actual color matching function is actually at least a combination of the two. In other words, the actual color matching function can be defined as X _i (λ) ≡ R _i (λ)T _i (λ), where T _i (λ) is the penetration function of the filter, i =1~3. If you add variations in component manufacturing, you actually have to make X _i (λ) , and It’s exactly the same, it’s going to be harder and harder.

Therefore, although it is impossible to manufacture photosensitive elements close to the standard color matching function, it is impossible to avoid the difference therebetween. Therefore, in actual measurement, the actual color matching function is normalized to reduce the actual color matching function and standard. Measurement error due to the difference between the color matching functions. Normal normalization is normalized using a known light source, such as the A source specified in CIE 1931, to obtain the normalization constants for each actual color matching function. , where i=1~3, The aforementioned standard color matching function , and . Therefore, the stimulus value obtained by measuring the light source to be measured is measured via the photosensitive element, that is, the value calculated by integrating the actual color matching function with the spectrum of the light source representing the light source to be tested, and multiplied by the corresponding normalization constant to obtain the corrected value. The stimulus value, in order to reduce the difference from the value calculated using the standard color matching function, but the error still inevitably exists. For a light source with a large wave width, such as white light, the error is acceptable; however, for a light source to be measured with a narrow wave width, such as monochromatic light, a non-negligible error will be caused.

Another use of the Four-color matrix method, proposed by Yoshihiro Ohno in 1997 (IS & T fifth color image conference 1997), using the red, green and blue light of the object to be tested and their combination The white light adjusts its three normalization coefficients to more accurately measure the chroma of the monochromatic light of the object to be tested. However, when measuring other sources that differ greatly from the source spectrum used for calibration, the error cannot be ignored.

Therefore, the conventional technique cannot effectively remove the congenital error of the light source measuring device, and provides a high-accuracy color coordinate; and if the difference between the spectrum of the light source to be tested and the source used for normalization is too large, the error of the measured color coordinate is measured. Will be bigger.

The invention discloses a method for constructing a light source measurement comparison table, a light source measurement method and a light source measurement system, and the chromaticity can be measured effectively and accurately with respect to a light source having a modelable spectrum feature. The invention utilizes the spectrum model of the light source which can represent the light source to be tested, and constructs the corresponding relationship between the spectral parameters of the light source spectrum model and the light source measurement system and the standard color coordinates. Therefore, although the light source measuring system of the present invention has only a color matching function which is not very standard, the high-precision estimated color coordinates of the light source to be tested can be determined by the above-described correspondence relationship. In addition, while determining the estimated color coordinates, the spectral parameters of the light source to be tested may also be determined at the same time, that is, the spectrum of the analog light source with respect to the light source to be tested is constructed. According to the spectrum of the analog light source (or the spectral parameter) and the standard color matching function, the stimulus value actually measured by the light source measuring system is corrected, and then the brightness of the light source to be tested is calculated. Thus, the light source metrology system of the present invention provides color metrics with considerable accuracy.

In a specific embodiment, the method for constructing a light source measurement comparison table of the present invention comprises: measuring a light source measurement system to obtain three actual color matching functions for the light source measurement system; and normalizing the three with a standard light source An actual color matching function; calculating a plurality of contrast color coordinates according to a plurality of spectral parameters based on a spectral model of a light source and the three actual color matching functions; and calculating a plurality of reference color coordinates according to the plurality of spectral parameters and three standard color matching functions For reference color coordinates, each spectral parameter corresponds to one of a plurality of contrast color coordinates and one of the plurality of reference color coordinates.

The source spectrum model can effectively represent the actual spectrum of the source to be tested and is represented by two variables: one is the central wavelength variable and the other is the full-width half maximum variable. In other words, each spectral parameter contains a center wavelength value and a half power full wave width value, which can represent a particular source spectrum. Each particular source spectrum corresponds to a reference color coordinate calculated from the actual color matching function and a reference color coordinate calculated from a standard color matching function. Therefore, the contrast color coordinates and the reference color coordinates are associated by the spectral parameters.

In the specific embodiment, the light source measuring system of the present invention comprises a photosensitive module, a storage module and a processing module. The photosensitive module includes a filter element and a photosensitive element, and the photosensitive module is configured to simultaneously sense at least one light source to be tested to generate three actual stimulation values corresponding to each of the light sources to be tested. The storage module is configured to store the lookup table. The processing module is electrically connected to the photosensitive module and the storage module. The processing module captures the photoelectric conversion signals from the photosensitive module to generate the three actual stimulation values and determines an estimated color coordinate for the light source to be tested according to the comparison table, and the processing module can determine the The spectral parameters of the light source to be tested, and the estimated brightness of the light source to be tested can be further determined according to the standard color matching function.

Therefore, in the specific embodiment, the light source measurement method of the present invention includes: the light source measurement system measures the light source to be tested through the photosensitive module to obtain three actual stimulation values; and the processing module according to the three The actual stimulus value calculates an actual color coordinate; the processing module compares the actual color coordinate with the plurality of color coordinates of the comparison table stored in the storage module to determine at least the actual color coordinate is matched a comparison color coordinate; the processing module determines an estimated color coordinate according to at least one of the reference color coordinates corresponding to at least one of the matching color coordinates, and according to at least one of the at least one contrast color coordinate corresponding to the matching The parameter determines a spectrum parameter of the light source to be tested; the processing module calculates a spectrum of the simulated light source, one of the three actual color matching functions, and a standard color matching function corresponding to an actual color matching function according to the spectrum parameter of the light source to be measured. An adjustment factor or a ratio is obtained to correct the actual stimulus value corresponding to an actual color matching function, thereby calculating an estimated brightness.

Therefore, the light source measuring system and the light source measuring method of the present invention can determine the spectral parameters matching the actual color coordinates, even the reference color coordinates, by using a comparison table constructed by the light source spectrum model representing the light source to be tested. Determine the estimated color coordinates of the light source to be tested. In this way, in the actual measurement, only a simple table lookup and calculation step can obtain a high-accuracy chromaticity value, which solves the problem that the prior art cannot overcome the difference between the actual color matching function and the standard color matching function. . Especially for mass-produced light sources, such as light-emitting diodes, liquid crystal display devices or other monochromatic light sources, although there are manufacturing variations, but the spectral characteristics are similar, the same spectral features can be modeled, and the spectrum parameters are used to cover the products. The variation of the light source measurement method of the present invention is more effective in measuring such products.

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

Please refer to FIG. 1A and FIG. 1B. FIG. 1A is a functional block diagram of a light source measuring system 1 according to a first preferred embodiment of the present invention, and FIG. 1B is a diagram showing a light source measuring system 1 schematic diagram. According to a first preferred embodiment, the light source measuring system 1 of the present invention is used to measure a light source 3 to be tested, such as an LED. The light source measurement system 1 includes a host 12 , a photosensitive module 14 , and a cable 16 . The host 12 and the photosensitive module 14 are electrically connected via a cable 16 . The mainframe 12 includes a processing module 122 and a storage module 124. The processing module 122 is electrically connected to the storage module 124 and electrically connected to the photosensitive module 14 via a cable 16. The storage module 124 stores a comparison table 126. The comparison table 126 includes a plurality of contrast color coordinates and a plurality of spectral parameters based on a source spectrum model, each spectral parameter corresponding to a contrast color coordinate. The photosensitive module 14 includes a filter element 142 and a photosensitive element 144.

Wherein, the spectrum model of the light source refers to a spectrum characteristic representing the light source 3 to be tested, and the spectrum parameter refers to a set of variable values of the spectrum model of the light source. For example, when the light source 3 to be tested is a monochrome LED, the variable of the spectral model of the light source can be expressed by a central wavelength variable λ ₀ (or with a maximum power wavelength λ _P ) and a half power full width variability Δλ _f , as shown in FIG. As shown, the spectral parameters include the variation values of the central wavelength variable λ ₀ and the half-power full-wave width variation Δλ _f . For the following description, λ ₀ and Δλ _{f are} also used to represent spectral parameters. The mathematical model of the source spectrum model can be used in a variety of different types. The spectrum symmetric distribution can be as follows:

The spectrum asymmetric distribution can be as follows:

Where S ₅₁ (λ _L )=S ₅₁ (λ _H )=0.5.

Incidentally, the choice of the spectrum model of the light source is not limited to the above six types, and should be determined according to the actual spectral characteristics of the light source 3 to be tested, and a suitable model may be derived separately, or the model directly expressed by the numerical set distribution may also be used. .

By selecting an appropriate source spectrum model, the variables of the selected source spectrum model can be set to cover all possible situations in which the source 3 to be tested is manufactured. This variable setting is represented in the comparison table 126 as the spectral parameters λ ₀ and Δλ _f . The light source spectrum model representing the light source 3 to be tested and the actual color matching function of the light source measuring system 1 are calculated in advance to obtain a contrast color coordinate, and each of the contrast color coordinates corresponds to a specific light source spectrum, that is, corresponding to one spectrum. Parameters; and each source spectrum (or spectral parameter) is calculated with the CIE 1931 standard color matching function to obtain the corresponding reference color coordinates. The above calculation results will constitute the contents of the comparison table 126. The comparison table 126 is used to compare the contrast color coordinates with the actual color coordinates of the light source 3 to be measured to determine the reference color coordinates, and further obtain the standard color coordinates of the light source 3 to be tested. In other words, if the spectral characteristics of the light source 3 to be tested are exactly the same as the spectrum of a certain light source, the standard color coordinates of the light source 3 to be tested (ie, the color coordinates measured by the measuring device conforming to the CIE 1931 standard color matching function) will It is almost identical to the reference color coordinates corresponding to the spectrum of a light source. In addition, the comparison table 126 needs to be constructed before the light source measurement and stored in the storage module 124 for subsequent measurement.

Referring to FIG. 3, FIG. 3 is a flow chart showing a method for constructing a light source measurement comparison table according to the first preferred embodiment. According to a first preferred embodiment, the method for constructing a light source measurement comparison table of the present invention first scans the light source measurement system 1 with a sufficiently fine wavelength interval using a monochromator to obtain three actual color matching functions X _{r .} (λ), Y _r (λ), and Z _r (λ), as shown in step S100; then, as shown in step S102, a light source S _A (λ) of a known spectral distribution, such as A specified by CIE 1931 The light source normalizes the aforementioned actual color matching functions X _r (λ), Y _r (λ), and Z _r (λ) to obtain the normal color matching function after normalization. , and (Subsequently referred to the actual color matching function refers to the actual color matching function after this normalization , and The relationship is as follows:

It should be noted that the aforementioned normalization is based on the need to correct or reduce the actual color matching functions X _r (λ), Y _r (λ) and Z _r (λ) with the standard color matching function. , and The difference is implemented, so if the difference is allowed or for other reasons, the normalization may not be performed.

The method for constructing the light source measurement comparison table of the present invention is then based on the spectral parameters λ ₀ and Δλ _f and the actual color matching function based on the source spectrum model S _t (λ, λ ₀ , Δλ) of the source 3 to be tested. , and Calculate a plurality of control stimulus values corresponding to different spectral parameters λ ₀ and Δλ _f , and And further correspondingly calculate the contrast color coordinates x _idx and y _idx as shown in step S104. The aforementioned calculation relationship is as follows:

According to the above calculation, the calculated comparison table 126 is illustrated as follows:

Supplementary note, the above control stimulus value , and Although the calculation formula does not consider the influence of the spectral amplitude of the light source 3 to be tested, since the contrast color coordinates x _idx and y _idx are dimensionless, the spectrum amplitude does not affect the calculation of the contrast color coordinates x _idx and y _idx ; On the other hand, it is also highlighted that the comparison table 126 can be independent of the spectral amplitude of the light source 3 to be tested, and can be constructed in advance. Further, although the construction method of the above-described comparison table 126 is performed for a single and specific light source measurement system 1, in the special case, for example, the same comparison table 126 can be used for the light source measurement system 1 which is relatively stable in mass production. In addition, the range and spacing of the spectral parameters λ ₀ and Δλ _{f in} the comparison table 126 may depend on the actual wavelength range of the light source 3 to be tested and the desired color coordinate accuracy.

For example, the contrast color coordinates x _idx and y _idx range -0 x _idx 0.73, 0 y _idx 0.83. If a color coordinate with 0.001 precision is to be obtained, the corresponding spectral parameters λ ₀ and Δλ _f need about 3 × 10 ⁵ ((1/2) × (0.73 / 0.001) × (0.83 / 0.001) 3 × 10 ⁵ ). However, in terms of LEDs, the half-power full-wave width is only about 50 nm, which accounts for 1/7 of the visible light wavelength of 350 nm. Therefore, the spectral parameters λ ₀ and Δλ _{f of the} corresponding LED need only about 5×10 ⁴ . Taking the center wavelength λ _{0 of the} LED between 400 nm and 700 nm and the half power full wave width Δλ _f between 20 nm and 50 nm as an example, when the center wavelength λ _{0 is} changed by 0.25 nm, the pitch is 0.5 nm, and the half power is 0.5 nm. For the variation of the wave width Δλ _f , a comparison table 126 ((350/0.25)×(30/0.5) with 8×10 ⁴ spectral parameters λ ₀ and Δλ _f will be constructed. 8×10 ⁴ ). This value is greater than 5 x 10 ⁴ , i.e., the look-up table 126 established with this varying pitch provides color coordinates above 0.001 precision. Of course, if a more precise color coordinate is to be obtained, it can be achieved by reducing the variation pitch of the center wavelength λ ₀ and the half power full wave width Δλ _f .

Referring to FIG. 4, FIG. 4 is a flow chart showing a method for measuring a light source according to the first preferred embodiment. According to the first preferred embodiment, the light source measuring method of the present invention first senses the light emitted by the light source 3 to be tested, and the light is filtered by the filtering light element 142, and the photosensitive element 144 absorbs the filtered light and generates The photoelectric conversion signal is sent to the processing module 122 to generate three actual stimulation values X _M , Y _M and Z _M , and the processing module 122 further calculates corresponding actual color coordinates x _M and y _M as shown in step S200. Among them, the relationship between the actual color coordinates x _M and y _M and the actual stimulus values X _M , Y _M and Z _M is as follows:

Next, the processing module 122 determines at least one contrast color coordinate x _idx and y _idx matching the actual color coordinates x _M and y _M according to the actual color coordinates x _M and y _M and the comparison table 126 , as shown in step S202 . Then, the processing module 122 determines a spectrum parameter of the light source to be tested according to at least one of the spectral parameters λ ₀ and Δ λ _f corresponding to at least one of the contrast color coordinates x _idx and y _idx that are matched. and , as shown in step S204. Spectral parameters of the source to be tested and It can represent the spectral characteristics of the light source 3 to be tested, that is, the light source 3 to be tested can simulate the spectrum of the light source. Indicates that A _S is the spectral amplitude of the light source 3 to be tested. In addition, it is necessary that the foregoing matching is not exactly the same value. If it is within a predetermined allowable difference from a certain contrast color coordinate x _idx and y _idx , it is also considered to be the same color coordinate x _idx and y _idx matches; in other words, in this case, each of the contrast color coordinates x _idx and y _idx has a certain coverage range, when the actual color coordinates x _M and y _M fall on a contrast color coordinate x _idx and y Within the scope of _idx , it can be considered to match the contrast color coordinates x _idx and y _idx . If the actual color coordinates x _M and y _M fall between the two contrast color coordinates x _idx and y _idx , it is also considered to match the two contrast color coordinates x _idx and y _idx . Matching at least one contrast color coordinate x _idx and y _idx will determine the spectrum parameter of the light source to be tested as step S204 and The basis of the data to be measured in step S204 and The contrast color coordinates x _idx and y _idx are determined first in step S202, and the contrast color coordinates x _idx and y _{idx are} considered to match the actual color coordinates x _M and y _M .

For example, if the actual color coordinates x _M and y _M fall between the contrast color coordinates x ₂ and y ₂ in Table 1 and the contrast color coordinates x ₃ and y ₃ , that is, x _M is between x ₂ and x ₃ , And y _M is located between y ₂ and y ₃ . The contrast color coordinates x ₂ and y ₂ and x ₃ and y ₃ respectively correspond to the spectral parameters λ ₂ and Δλ _{2 in} Table 1 and the spectral parameters λ ₃ and Δλ ₃ , and are linearly interpolated to determine the corresponding actual color coordinates x _M and y The spectral parameter of _M , ie the spectral parameters of the source to be tested and , its calculation relationship is as follows:

Of course, the present invention is not limited to the linear interpolation method, and can be obtained by other calculation relations, and the reference color coordinates x ₂ , y ₂ , x ₃ and x ₃ cited in the relationship are regarded as matching the actual color coordinates x _M and y _M. In principle, linear interpolation can achieve good accuracy if the spacing between the reference color coordinates x _idx and y _idx is small enough.

Please continue to see the fourth picture. As shown in step S206, the processing module 122 also determines the spectral parameters of the light source to be tested. and Actual color matching function , and And standard color matching function , and Calculate three error values ΔX, ΔY, and ΔZ, and calculate the relationship as follows:

Where X _MS , Y _MS and Z _{MS are} based on the spectral parameters of the source to be tested and And constructing the spectrum of the analog light source about the light source 3 to be tested Standard color matching function , and Standard stimulus value; X _SIM , Y _SIM and Z _{SIM are} the spectrum of the analog source Actual color matching function , and The simulated stimulus value; in addition, the above spectral amplitude A _{S is} also divided by Y _M The integral value is either divided by Z _M The integral value is obtained. Of course, the A _S calculated by the above three calculations may be different, but may be determined by the average value.

Therefore, as shown in step S208, the processing module 122 corrects the three actual stimulation values X _M , Y _M and Z _M by using the three error values ΔX, ΔY and ΔZ to calculate an estimated color coordinate with respect to the light source 3 to be tested. x _EST , y _EST and z _EST , the calculation relationship is as follows: x _EST = (X _M + ΔX) / (X _M + ΔX + Y _M + ΔY + Z _M + ΔZ); y _EST = (Y _M + ΔY / (X _M + ΔX + Y _M + ΔY + Z _M + ΔZ); z _EST = (Z _M + ΔZ) / (X _M + ΔX + Y _M + ΔY + Z _M + ΔZ).

The above estimated color coordinates x _EST , y _EST and z _{EST are} the color coordinate measurement results of the final output of the light source measuring system 1 . In addition, in the above step S206, if three error values are defined as , and :

Then, in the above step S208, the estimated color coordinates x _EST , y _EST and z _EST with respect to the light source 3 to be tested can be obtained by the following calculation relation:

Error value described later , and Because it does not involve the spectral amplitude A _S of the light source 3 to be tested, it can be calculated corresponding to different spectral parameters λ ₀ and Δλ _f to form an error correction parameter, and is integrated into the comparison table 126, as shown in the following table. Second:

among them , , ,..., Is the reference error value, and its calculation relationship is as described above. , and Same, but not using specific spectral parameters of the source to be tested and Source spectrum model The calculation is performed by the source spectrum model S _t (λ, λ ₀ , Δλ) corresponding to different spectral parameters λ ₀ and Δλ _f , and the implementation of this calculation can be incorporated into step S104 in FIG. 3 , and details are not described herein again.

By using the above-mentioned comparison table 126 (ie, Table 2), in the foregoing step S204, the spectrum parameter of the light source to be tested is determined. and Logic, the processing module 122 determines three error values according to at least one error correction parameter corresponding to at least one of the spectral parameters λ ₀ and Δλ _f , and Further, as a basis for correcting the actual stimulation values X _M , Y _M and Z _M , and further calculating estimated color coordinates x _EST , y _EST and z _EST with respect to the light source 3 to be tested.

According to the first preferred embodiment described above, the light source measuring system 1 utilizes an analog light source spectrum (or ) and the actual color matching function , and And standard color matching function , and The error values ΔX, ΔY, and ΔZ formed are calculated to correct the actual stimulus values X _M , Y _{M ,} and Z _M , and the estimated color coordinates x _EST , y _{EST ,} and z _{EST are} calculated. However, the invention is not limited thereto. Referring to FIG. 4 and FIG. 5, FIG. 5 is a flow chart showing a method for measuring a light source according to a second preferred embodiment of the present invention. The difference from the first preferred embodiment is that the light source measurement method of the second preferred embodiment determines the spectrum parameter of the light source to be tested by the processing module 122 in step S204. and Afterwards, the processing module 122 directly determines the spectral parameters of the light source to be tested. and With standard color matching functions , and , calculate three simulated standard stimulus values , and As shown in step S206a, the calculation relationship is as follows:

The processing module 122 further directly simulates the stimulus value according to the simulation standard , and Calculate the estimated color coordinates x _EST , y _EST and z _EST . As shown in step S208a, the calculation relationship is as follows:

It should be noted that, although the above calculation method is different from that shown in step S208, they are all the estimated color coordinates x _EST , y _EST and z _EST of the light source measurement system 1 with respect to the light source 3 to be tested, and thus are expressed by the same symbols. . In addition, since the estimated color coordinates x _EST , y _EST and z _EST are dimensionless, the above simulated standard stimulus values are , and Although the spectral amplitude A _S is not included, the estimated color coordinates x _EST , y _EST and z _EST can be calculated; in other words, some reference color coordinates x _ref and y _ref can be calculated in advance as the calculated estimated color coordinates x _EST , y _EST and z _EST . Referring to FIG. 6, FIG. 6 is a flow chart showing a method for constructing a light source measurement comparison table according to a third preferred embodiment of the present invention. The difference from the method for constructing the light source measurement comparison table in FIG. 3 is that the comparison table 126 further includes a plurality of reference color coordinates x _ref and y _ref , and each of the reference color coordinates x _ref and y _ref corresponds to one spectral parameter λ _{0 .} And Δλ _f , that is, corresponding to a contrast color coordinate x _idx and y _idx . As shown in step S106, the method for constructing a light source measurement comparison table of the present invention further comprises according to a standard color matching function. , and Calculate three reference standard excitation values for each spectral parameter λ ₀ and Δλ _f , and And further calculate the reference color coordinates x _ref and y _ref . The aforementioned calculation relationship is as follows:

According to the above calculation, the calculated comparison table 126 is shown in the following Table 3:

Referring to FIG. 4 and FIG. 7 , FIG. 7 is a flow chart showing a method for measuring a light source according to a third preferred embodiment. The difference from the first preferred embodiment is that the light source measurement method of the third preferred embodiment is in step S204a, the processing module 122 is based on at least one reference of the corresponding matching contrast color coordinates x _idx and y _idx . The color coordinates x _ref and y _ref directly determine the estimated color coordinates x _EST , y _EST and z _EST for the light source 3 to be tested. About determining the spectrum parameters of the light source to be tested and The description also applies to the decision logic of estimating the color coordinates x _EST , y _EST and z _EST in step S204a, and therefore will not be described again. It is added that although simply determining the estimated color coordinates x _EST , y _EST and z _EST may not involve measuring the spectral parameters of the source and Therefore, the corresponding spectral parameters λ ₀ and Δλ _f may not be displayed in the comparison table 126, but the spectral parameters of the light source to be tested are determined only when determining the estimated luminance I _{EST of} the light source 3 to be tested. and Still need to be found, so Table 3 still shows the correspondence between the spectral parameters λ ₀ and Δλ _f and the reference color coordinates x _idx and y _idx and the reference color coordinates x _ref and y _ref .

The foregoing is a description of the estimated color coordinates x _EST , y _{EST ,} and z _EST , and the estimated luminance I _EST will be described next. Referring to FIG. 8, FIG. 8 is a flow chart showing a method for measuring a light source based on the first preferred embodiment. Since the color coordinates and the brightness can be processed separately, only a flow chart of the light source measurement method for estimating the brightness I _EST is shown in FIG. After the completion of step S204, the obtained data includes the actual stimulation values X _M , Y _M and Z _M , the spectral parameters of the light source to be tested. and (or analog source spectrum And the values in the calculation process, etc., such as the error values ΔX, ΔY and ΔZ (or , and ), the spectral amplitude A _{S ,} etc., depending on the choice of different color coordinates. According to CIE 1931, brightness is defined as a standard color matching function. And the integrated value of the light source to be tested, so the light source measuring method of the present invention then includes the processing module 122 according to the spectral parameters of the light source to be tested and And corresponding standard color matching function Actual color matching function , calculate the simulated stimulus value , as shown in step S210. The aforementioned calculation relationship is as follows:

As shown in step S212, the processing module 122 is configured according to the spectral parameters of the light source to be tested. and The aforementioned actual color matching function And the corresponding standard color matching function , calculate the error value (For the calculation relationship, refer to the description about step S204: . Next, as shown in step S214, the processing module 122 is based on the error value. Simulated stimulus value The ratio and the corresponding actual stimulus value Y _{M are} used to calculate the estimated luminance I _EST with respect to the light source 3 to be tested, and the calculation relationship is as follows:

Similarly, the error value It is not related to the spectrum amplitude A _S , so the reference error value can be calculated in advance for each of the spectral parameters λ ₀ and Δλ _f and listed in the comparison table 126, as shown in Table 4 below:

Similarly, by using the above-mentioned comparison table 126 (ie, Table 4), in the foregoing step S212, the spectrum parameter of the light source to be tested is determined. and The logic module determines the error value according to at least one reference error value of the at least one of the spectral parameters λ ₀ and Δλ _{f that are} matched. . If we compare Table 2 and Table 4, we can see that the reference error value of Table 4 is only one of the error correction parameters of Table 2. The table 4 can be integrated into Table 2 and calculated according to the above formula. When the brightness is I _EST , only the simulated stimulus value needs to be calculated. The estimated brightness I _EST can be easily calculated.

In addition, the simulated stimulus value Also not related to the spectral amplitude A _S , so the error value can also be Calculate the reference ratio for each spectral parameter λ ₀ and Δλ _{f in} advance ,among them and The values calculated for each of the spectral parameters λ ₀ and Δλ _f are listed in the comparison table 126 as shown in Table 5 below:

Which determines the spectral parameters of the source to be tested and The logic module determines a specific ratio γ ^* based on at least one reference ratio γ of at least one of the spectral parameters λ ₀ and Δλ _{f that are} matched. Therefore, the estimated luminance I _EST can be derived as I _EST = Y _M × (1 + γ ^* ).

Further, if (1+γ ^* ) is regarded as a specific adjustment coefficient k ^* , the estimated luminance I _EST can be further simplified to I _EST = Y _M × k ^* . Similarly, the reference adjustment coefficient k can be calculated in advance for each of the spectral parameters λ ₀ and Δλ _f and listed in the comparison table 126, as shown in Table 6 below:

Similarly, the use of determining the spectral parameters of the source to be tested and The logic module, the processing module 122 determines a specific adjustment coefficient k ^* according to at least one reference adjustment coefficient k of the at least one of the matched spectral parameters λ ₀ and Δλ _f , and then calculates the estimated luminance I _EST .

Referring to FIG. 9 , FIG. 9 is a flow chart of a method for measuring a light source according to another embodiment. The difference between the flowchart shown in FIG. 9 and FIG. 8 is that in step 212a, the processing module 122 no longer calculates the aforementioned error value. Instead, the simulated standard stimulus value Y _{MS is} directly calculated (the calculation relationship can be referred to the description about step S206a: In step 214a, the processing module 122 is based on the simulated standard stimulus value Y _MS and the simulated stimulus value. The ratio and the corresponding actual stimulus value Y _{M are} used to calculate the estimated luminance I _EST with respect to the light source 3 to be tested, and the calculation relationship is as follows:

Similarly, simulating standard stimulus values Simulated stimulus value Both are independent of the spectral amplitude A _S , so the ratio can be calculated in advance for each of the spectral parameters λ ₀ and Δλ _f and listed in the comparison table 126. In fact, Therefore, the corresponding reference standard stimulus value can be calculated for each of the spectral parameters λ ₀ and Δλ _f (Refer to the description about step S106: And the reference stimulus value (ie, the control stimulus value in step S104) And, the ratio (actually equal to the aforementioned reference adjustment factor k ) is incorporated into the look-up table 126, as shown in Table 6 above. The calculation of the specific ratio (i.e., the adjustment coefficient k ^* ) and the calculation of the estimated luminance I _{EST are} also as described above, and therefore will not be described again.

Referring to FIG. 10, FIG. 10 is a flow chart showing a method for measuring a light source according to a fourth preferred embodiment of the present invention. The difference from the light source measurement method shown in FIG. 9 is that the light source measurement method shown in FIG. 10 does not directly correct the actual stimulation value Y _M , but finds the spectral amplitude A of the light source 3 to be tested. _S , as shown in step S210a of FIG. 10; and the spectral parameters of the light source to be tested that have been found in the process of determining the color coordinates x _EST , y _EST and z _EST and And standard color matching function The estimated brightness I _{EST is} calculated as shown in step 214b.

In detail, according to the spectrum parameters of the light source to be tested and And constructing the spectrum of the analog light source about the light source 3 to be tested Actual color matching function The simulated stimulus value Y _SIM is expressed as follows:

Since the source spectrum model S _t (λ, λ ₀ , Δλ) is based on the construction of the light source 3 to be tested, it has a fairly high representative representative of the actual spectral characteristics of the light source 3 to be tested. Therefore, the simulated stimulus value Y _{SIM is} basically The upper part can represent the actual stimulus value Y _M , and then the spectrum amplitude A _S can be obtained as follows:

Of course, you have to divide by X _M The integral value is either divided by Z _M The integral value is obtained. Of course, the A _S calculated by the above three calculations may be different, but may be determined by the average value. After obtaining the spectrum amplitude A _S , the estimated luminance I _EST can be calculated according to the following formula:

Although the foregoing specific embodiments respectively describe the process of determining the estimated color coordinates x _EST , y _EST and z _EST and the estimated brightness I _EST , they may be used in combination in practical use, and are not limited to the above specific embodiments. In addition, although the above-mentioned single light source to be tested is taken as an example, in practice, multi-light source measurement can also be performed at the same time.

Referring to FIG. 11, FIG. 11 is a schematic diagram of a light source measuring system 5 according to a fifth preferred embodiment of the present invention. The light source measuring system 5 includes a lens 52, a filter wheel 54, an image sensing device (for example, a charge-coupled image sensing device (CCD) 56), a processing module (not shown), and Storage module (not shown in the figure). The light source measuring system 5 can be used to measure a light emitting device having a plurality of light sources to be tested, such as a liquid crystal display (LCD) 7. The light emitted by the LCD 7 passes through the lens 52, is filtered by the filter wheel 54, and is finally imaged on the CCD 56. The filter wheel 54 includes four filters which are combined with the spectral response of the lens 52 and the CCD 56, as described above for the actual color matching function. , and Two of the filters will be combined with the spectral response of the lens 52 and the CCD 56 to synthesize the actual color matching function. . The light source measuring system 5 also includes an optical shutter 58 for controlling the entry or exit of light.

The LCD 7 is usually arranged in two dimensions, and the images of the plurality of to-be-measured light sources imaged on the CCD 56 are also two-dimensionally arranged, and the CCD 56 includes a plurality of photosensitive cells (not shown in the figure), which can respectively sense and transmit photoelectric conversion. Signal to processing module for processing. The process of determining the processing of the photoelectric conversion signal (for example, generating the actual stimulus value) and its subsequent estimation of the color coordinates and the estimated brightness is also described in the foregoing embodiments, and details are not described herein again. Although the image of each light source to be tested of the LCD 7 does not necessarily correspond to only one photosensitive unit, it can be processed through image pixels to identify each light source to be tested, and the corresponding estimated color coordinates and estimated brightness are calculated. In principle, the density of the photosensitive cells of the CCD 56 is generally much higher than the density of the light source to be tested of the LCD 7, so that a relatively high degree of discrimination can be provided for the plurality of light sources CCD 56 to be tested; in other words, the light source measuring system 5, according to the method for measuring a single light source in the foregoing specific embodiments, measuring the estimated color coordinates and estimated brightness of the image corresponding to each photosensitive unit, and further calculating the average color coordinates on the image corresponding to each light source by using the software Its color profile (Color-profile), which in turn accurately calculates the estimated color coordinates and estimated brightness of the light source to be tested.

In addition, the foregoing is an example of a light source to be tested that is two-dimensionally set, so it is of course applicable to a light source to be tested that is one-dimensionally arranged, and is not described again, for example, an LED light source arranged along a straight line or a curved line. It is also worth mentioning that although the spectral response of the photosensitive unit of the CCD 56 is substantially the same, it is affected by the optical effects of the components such as the lens 52 and the filter due to being disposed at different positions, and has different sensitivity. Therefore, the light source measuring system 5 can first perform a flat-field calibration, that is, a very uniform light source is used to illuminate each photosensitive unit, and the sensing size of each photosensitive unit at this time is read, and then according to the difference, A flat field adjustment coefficient is made for each photosensitive unit to compensate for the difference in sensitivity. The flat field adjustment coefficients can be made into a sensitization adjustment table incorporated in the aforementioned comparison table 126. Therefore, before processing the photoelectric conversion signal generated by each photosensitive unit, the photoelectric conversion signal is compensated by the corresponding flat field adjustment coefficient, and then the signal processing and subsequent calculation of the estimated color coordinates and the estimated brightness are performed; or The photoelectric conversion signal is directly processed first and subsequent calculations are performed, but the calculation of the estimated brightness is corrected by the corresponding flat field adjustment coefficient.

In summary, the light source measuring system and the light source measuring method of the present invention use a comparison table constructed by a light source spectrum model which can represent the light source to be tested, and can be determined by simply looking up the table and calculating steps. Measure the spectral parameters of the light source, high-precision color coordinates and brightness, and so on. In short, for the known spectral characteristics of the light source to be tested, a comparison table can be constructed in advance to link the measurement relationship between the actual measurement system and the standard measurement system, thereby eliminating the need to analyze the actual measurement system and standards. Measuring the measurement error between systems, while still maintaining a fairly high accuracy of the chromaticity measurement.

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, 5. . . Light source measurement system

3. . . Light source to be tested

7. . . LCD

12. . . Host

14. . . Photosensitive module

16. . . Cable

52. . . lens

54. . . Filter turntable

56. . . CCD

58. . . Shutter

122. . . Processing module

124. . . Storage module

126. . . Chart

142. . . Filter element

144. . . Photosensitive element

S100~S106, S200~S214b. . . Process step

Figure 1A is a functional block diagram of a light source measurement system in accordance with a first preferred embodiment of the present invention.

Figure 1B is a schematic diagram showing a light source measuring system.

Figure 2 is a schematic diagram showing the spectrum model of the light source.

FIG. 3 is a flow chart showing a method for constructing a light source measurement comparison table according to the first preferred embodiment.

FIG. 4 is a flow chart showing a method for measuring a light source according to the first preferred embodiment.

FIG. 5 is a flow chart showing a method for measuring a light source according to a second preferred embodiment of the present invention.

6 is a flow chart showing a method for constructing a light source measurement comparison table according to a third preferred embodiment of the present invention.

Figure 7 is a flow chart showing a method for measuring a light source according to a third preferred embodiment.

FIG. 8 is a flow chart showing a method for measuring a light source based on the first preferred embodiment.

FIG. 9 is a flow chart showing a method of measuring a light source according to another embodiment.

Figure 10 is a flow chart showing a method of measuring a light source according to a fourth preferred embodiment of the present invention.

Figure 11 is a schematic view showing a light source measuring system according to a fifth preferred embodiment of the present invention.

S200, S202, S204a. . . Process step

Claims (50)

A light source measuring method for measuring a light source to be measured by a light source measuring system according to a comparison table, the comparison table comprising a plurality of spectral parameters based on a spectrum model of a light source and a plurality of contrast color coordinates, each of the control colors The coordinate pair corresponds to one of a plurality of spectral parameters, and the light source measuring method comprises the following steps: measuring the light source to be tested by the light source measuring system to obtain three actual stimulus values and calculating an actual color coordinate; according to the actual The color coordinates and the comparison table determine to match at least one of the contrast color coordinates of the actual color coordinates; and determine a spectral parameter of the light source to be tested according to at least one of the spectral parameters corresponding to at least one of the matching color coordinates. The method for measuring a light source according to claim 1, further comprising: measuring the light source measuring system to obtain three actual color matching functions; and calculating, according to the three actual color matching functions and the plurality of spectral parameters, The plurality of corresponding contrast color coordinates. The method for measuring a light source according to claim 2, further comprising: normalizing the three actual color matching functions with a standard light source. The method of measuring a light source according to claim 1, wherein the source spectrum model comprises a central wavelength variable and a half power full width variable. The method for measuring a light source according to claim 1, further comprising: calculating three error values according to the spectral parameters of the light source to be tested, the three actual color matching functions, and three standard color matching functions; and using the three The error values correct the three actual stimulus values, and calculate an estimated color coordinate for one of the light sources to be tested. The method of measuring a light source according to claim 1, wherein the comparison table further comprises a plurality of error correction parameters, each error correction parameter comprising three reference error values and one of a plurality of spectral parameters, and The light source measuring method further includes: determining, according to at least one of the error correction parameters corresponding to at least one of the spectral parameters, three error values; and correcting the three actual stimulus values by using the determined three error values, and calculating An estimated color coordinate for one of the light sources to be tested. The method for measuring a light source according to claim 6, further comprising: calculating the plurality of corresponding error correction parameters according to the three actual color matching functions, the three standard color matching functions, and the plurality of spectral parameters. The method for measuring a light source according to claim 1, further comprising: calculating three simulated standard stimulus values according to the spectral parameters of the light source to be tested and three standard color matching functions; and the stimulus values according to the three simulated standards Calculating an estimated color coordinate for one of the light sources to be tested. The light source measurement method according to claim 1, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the light source measurement system, and the light source measurement method further comprises: according to the test Calculating an analog stimulus value by calculating a spectral parameter of the light source and one of the three actual color matching functions; calculating an error value according to the spectral parameter of the light source to be tested, a standard color matching function, and the actual color matching function; and calculating the error value according to the error The ratio of the value to the simulated stimulus value and the actual stimulus value corresponding to an actual color matching function calculates an estimated brightness for one of the light sources to be tested. The light source measuring method according to claim 1, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the light source measuring system, and the comparison table further comprises a plurality of reference error values, each of which The reference error value corresponds to one of the plurality of spectral parameters, and the light source measuring method further comprises: calculating a simulated stimulus value according to one of the spectral parameters of the light source to be tested and the three actual color matching functions; And matching at least one reference error value of the at least one spectral parameter to determine an error value; and calculating the ratio according to the ratio of the determined error value to the simulated stimulus value and the actual stimulus value corresponding to an actual color matching function One of the light sources to be measured estimates the brightness. The method for measuring a light source according to claim 10, further comprising: calculating the plurality of corresponding reference error values according to the plurality of spectral parameters, a standard color matching function, and the actual color matching function. The light source measurement method according to claim 1, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the light source measurement system, and the light source measurement method further comprises: according to the test Calculating a simulated stimulus value according to one of the three spectral parameters of the light source and the three actual color matching functions; calculating a simulated standard stimulus value according to the spectral parameter of the light source to be tested and a standard color matching function; and the stimulus value according to the simulated standard The ratio of the simulated stimulus values and the actual stimulus values corresponding to an actual color matching function are used to calculate an estimated brightness for one of the light sources to be tested. The light source measuring method according to claim 1, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the light source measuring system, and the comparison table further comprises a plurality of reference adjustment coefficients, each of which The reference adjustment coefficient corresponds to one of the plurality of spectral parameters, and the light source measurement method further comprises: determining an adjustment coefficient according to at least one of the reference adjustment coefficients corresponding to at least one of the spectral parameters; and determining the adjustment coefficient according to the One of the three actual stimulus values calculates an estimated brightness for one of the light sources to be tested. The light source measuring method according to claim 13, wherein the actual stimulus value corresponds to an actual color matching function of the light source measuring system, and the light source measuring method further comprises: according to the plurality of spectral parameters and The actual color matching function calculates a plurality of reference stimulus values corresponding to the plurality of spectral parameters; and calculates a plurality of reference standard stimulus values corresponding to the plurality of spectral parameters according to the plurality of spectral parameters and a standard color matching function; The plurality of reference standard stimulus values and the plurality of reference stimulus values are used to calculate the corresponding reference adjustment coefficients. The light source measurement method according to claim 1, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the light source measurement system, and the light source measurement method further comprises: according to the test Calculating a spectral amplitude of one of the light sources to be tested according to the spectral parameters of the light source, one of the three actual color matching functions, and the actual stimulus value corresponding to an actual color matching function; and the light source to be tested according to the spectrum amplitude The spectral parameters and a standard color matching function calculate the estimated brightness of one of the light sources to be tested. A light source measuring method for measuring a light source to be tested by a light source measuring system according to a comparison table, wherein the comparison table comprises a plurality of spectral parameters, a plurality of contrast color coordinates and a plurality of reference colors based on a spectrum model of a light source The coordinates, each of the spectral parameters respectively corresponding to one of the plurality of contrast color coordinates and one of the plurality of reference color coordinates, the light source measuring method comprising the steps of: measuring a light source to be measured by the light source measuring system Obtaining three actual stimulus values and calculating an actual color coordinate; determining, according to the actual color coordinates, at least one of the contrast color coordinates matching the actual color coordinates; and determining the reference according to at least one of the at least one contrast color coordinates corresponding to the matching The color coordinates determine the estimated color coordinates of one of the light sources to be tested. The method for measuring a light source according to claim 16, further comprising: measuring the light source measuring system to obtain three actual color matching functions; and calculating the three actual color matching functions and the plurality of spectral parameters a plurality of corresponding contrast color coordinates; and calculating the plurality of corresponding reference color coordinates according to the three standard color matching functions and the plurality of spectral parameters. The method for measuring a light source according to claim 17, further comprising: normalizing the three actual color matching functions with a standard light source. The method of measuring a light source according to claim 16, wherein the source spectrum model comprises a central wavelength variable and a half power full width variable. The light source measuring method according to claim 16, wherein the comparison table further includes a plurality of reference adjustment coefficients, each of the reference adjustment coefficients corresponding to one of the plurality of reference color coordinates, and the light source measuring method further The method includes: determining an adjustment coefficient according to at least one of the reference adjustment coefficients corresponding to at least one reference color coordinate; and calculating one of the light sources to be tested according to one of the three actual stimulation values and the adjustment coefficient Estimate the brightness. The light source measuring method according to claim 20, wherein the actual stimulus value corresponds to an actual color matching function of the light source measuring system, and the light source measuring method further comprises: according to the plurality of spectral parameters and The actual color matching function calculates a plurality of reference stimulus values corresponding to the plurality of reference color coordinates; and calculates a plurality of reference standard stimulus values corresponding to the plurality of reference color coordinates according to the plurality of spectral parameters and a standard color matching function; And calculating the corresponding reference adjustment coefficient according to the plurality of reference standard stimulation values and the plurality of reference stimulation values. A method for constructing a light source measurement comparison table, comprising the steps of: measuring a light source measurement system to obtain three actual color matching functions; calculating according to a plurality of spectral parameters based on a spectrum model of a light source and the three actual color matching functions a plurality of contrast color coordinates; and calculating a plurality of reference color coordinates according to the plurality of spectral parameters and three standard color matching functions, wherein each of the spectral parameters respectively corresponds to one of the plurality of contrast color coordinates and the plurality of reference colors One of the coordinates. The method for constructing a light source measurement comparison table according to claim 22, further comprising: normalizing the three actual color matching functions with a standard light source. The method for constructing a light source measurement comparison table according to claim 22, wherein the source spectrum model comprises a central wavelength variable and a half power full width variable. The method for constructing a light source measurement comparison table according to claim 22, wherein the three actual color matching functions respectively correspond to three standard color matching functions, and the method for constructing the light source measurement comparison table further comprises: according to the plural Calculating a plurality of reference stimulus values corresponding to the plurality of spectral parameters according to one of the spectral parameters and the three actual color matching functions; and calculating the pair according to the plurality of spectral parameters against the standard color matching function of an actual color matching function A plurality of reference standard stimulus values of the plurality of spectral parameters are to be included; and a plurality of reference adjustment coefficients corresponding to the plurality of reference color coordinates are calculated based on the plurality of reference standard stimulus values and the plurality of reference stimulus values. A light source measuring system comprises: a photosensitive module comprising a filter element and a photosensitive element, wherein the photosensitive module is configured to simultaneously sense at least one light source to be tested to generate three actual stimulation values corresponding to each light source to be tested a storage module for storing a comparison table, the comparison table comprising a plurality of spectral parameters based on a spectral model of a light source and a plurality of contrast color coordinates, each of the contrast color coordinate pairs being one of a plurality of spectral parameters; a processing module electrically connecting the photosensitive module and the storage module, the processing module calculating an actual color according to the plurality of actual stimulation values sensed by the photosensitive module and corresponding to each of the light sources to be tested a coordinate, and then the processing module determines, according to the comparison table, matching at least one of the contrast color coordinates of the actual color coordinate, and determining a spectrum of the light source to be tested according to at least one of the spectral parameters corresponding to at least one of the matching color coordinates parameter. The light source measuring system according to claim 26, wherein the photosensitive module has three actual color matching functions, and the three actual color matching functions are normalized by a standard light source. The light source measuring system of claim 26, wherein the source spectrum model comprises a central wavelength variable and a half power full width variable. The light source measuring system of claim 26, wherein the photosensitive element comprises a plurality of photosensitive cells. The light source measuring system of claim 29, wherein the plurality of photosensitive cells are arranged in a one-dimensional or two-dimensional array. The light source measuring system of claim 29, wherein the photosensitive element is a charge coupled image sensor. The light source measuring system of claim 29, wherein the filter element comprises a lens that images the at least one light source to be tested on the plurality of photosensitive cells. The light source measuring system of claim 32, wherein the storage module further stores a photosensitive adjustment table, wherein the photosensitive adjustment table comprises a plurality of flat field adjustment coefficients, and each photosensitive unit corresponds to a plurality of flat field adjustments. One of the coefficients, the processing module adjusts the plurality of actual stimulation values corresponding to the actual color coordinates according to the plurality of flat field adjustment coefficients of the sensitization adjustment table before calculating the actual color coordinates. The light source measuring system according to claim 26, wherein the processing module calculates three error values according to the spectral parameters of the light source to be tested, the three actual color matching functions, and three standard color matching functions, and then The three actual stimulus values are corrected using the three error values, and an estimated color coordinate is calculated. The light source measuring system of claim 26, wherein the comparison table further comprises a plurality of error correction parameters, each error correction parameter comprising three reference error values and one of a plurality of spectral parameters, The processing module determines three error values according to at least one error correction parameter corresponding to at least one of the spectral parameters that are matched, and then uses the three error values to correct the three actual stimulus values to calculate an estimated color coordinate. The light source measuring system according to claim 26, wherein the processing module calculates three simulated standard stimulus values according to the spectral parameters of the light source to be tested and three standard color matching functions, and then according to the three simulations. A standard stimulus value is used to calculate an estimated color coordinate. The light source measuring system of claim 26, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the photosensitive module, and the processing module is based on the spectral parameters of the light source to be tested and Calculating an analog stimulus value according to one of the three actual color matching functions, and then calculating an error value according to the spectral parameter of the light source to be tested, a standard color matching function and the actual color matching function, and then according to the error value and the simulation The estimated brightness is calculated by the ratio of the stimulus values and the actual stimulus value corresponding to an actual color matching function. The light source measuring system of claim 26, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the photosensitive module, the comparison table further comprising a plurality of reference error values, each reference The error value corresponds to one of the plurality of spectral parameters, and the processing module calculates an analog stimulus value according to one of the spectral parameters of the light source to be tested and the three actual color matching functions, and then according to at least one of the corresponding matching At least one reference error value of the spectral parameter determines an error value, and an estimated brightness is calculated according to a ratio of the error value to the simulated stimulus value and the actual stimulus value corresponding to an actual color matching function. The light source measuring system of claim 26, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the photosensitive module, and the processing module is based on the spectral parameters of the light source to be tested and Calculating an analog stimulus value according to one of the three actual color matching functions, and then calculating a simulated standard stimulus value according to the spectral parameter of the light source to be tested and a standard color matching function, and then according to the simulated standard stimulus value and the simulated stimulus value The ratio of the ratio and the actual stimulus value corresponding to an actual color matching function calculates an estimated brightness. The light source measuring system of claim 26, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the photosensitive module, the comparison table further comprising a plurality of reference adjustment coefficients, each reference The adjustment coefficient corresponds to one of the plurality of spectral parameters, and the processing module determines an adjustment coefficient according to at least one of the reference adjustment coefficients corresponding to at least one of the spectral parameters, and then according to the adjustment coefficient and the three actual stimuli One of the values, an estimated brightness is calculated. The light source measuring system of claim 26, wherein the three actual stimulation values respectively correspond to three actual color matching functions of the photosensitive module, and the processing module is based on the spectral parameters of the light source to be tested, Calculating a spectrum amplitude according to one of the three actual color matching functions and the actual stimulus value corresponding to an actual color matching function, and then calculating a spectrum according to the spectrum amplitude, the spectral parameter of the light source to be tested, and a standard color matching function. Estimate the brightness. A light source measuring system comprises: a photosensitive module comprising a filter element and a photosensitive element, wherein the photosensitive module is configured to simultaneously sense at least one light source to be tested to generate three actual stimulation values corresponding to each light source to be tested a storage module for storing a comparison table, the comparison table comprising a plurality of spectral parameters based on a spectral model of a light source, a plurality of contrast color coordinates, and a plurality of reference color coordinates, each spectral parameter corresponding to a plurality of comparisons respectively One of the color coordinates and one of the plurality of reference color coordinates; a processing module electrically connecting the photosensitive module and the storage module, the processing module according to the plurality of sensing based on the photosensitive module An actual stimulus value is calculated for each light source to be tested, and then the processing module determines, according to the comparison table, at least one of the color coordinates of the actual color coordinate, and then matches at least one of the corresponding color coordinates. At least one of the reference color coordinates of the color coordinates determines an estimated color coordinate for one of the light sources to be tested. The light source measuring system of claim 42, wherein the photosensitive module has three actual color matching functions, and the three actual color matching functions are normalized by a standard light source. The light source measurement system of claim 42, wherein the source spectrum model comprises a central wavelength variable and a half power full width variable. The light source measuring system of claim 42, wherein the photosensitive element comprises a plurality of photosensitive cells. The light source measuring system of claim 45, wherein the plurality of photosensitive cells are arranged in a one-dimensional or two-dimensional array. The light source measuring system of claim 45, wherein the photosensitive element is a charge coupled image sensing device. The light source measuring system of claim 45, wherein the filter element comprises a lens, and the lens images the at least one light source to be tested on the plurality of photosensitive cells. The light source measuring system of claim 48, wherein the storage module further stores a photosensitive adjustment table, wherein the photosensitive adjustment table comprises a plurality of flat field adjustment coefficients, and each photosensitive unit corresponds to a plurality of flat field adjustments. One of the coefficients, the processing module adjusts the plurality of actual stimulation values corresponding to the actual color coordinates according to the plurality of flat field adjustment coefficients of the sensitization adjustment table before calculating the actual color coordinates. The light source measuring system of claim 42, wherein the comparison table further comprises a plurality of reference adjustment coefficients, each reference adjustment coefficient corresponding to one of a plurality of reference color coordinates, the processing module and according to the pair At least one reference adjustment coefficient of at least one reference color coordinate should be matched to determine an adjustment coefficient, and then an estimated brightness is calculated according to one of the three actual stimulation values and the adjustment coefficient.