CN112577719A - LED aperture checking method and system, LED aperture calibrating method and system, and LED aperture verifying method and system - Google Patents
LED aperture checking method and system, LED aperture calibrating method and system, and LED aperture verifying method and system Download PDFInfo
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Abstract
The invention relates to a method and a system for detecting an LED aperture, a method and a system for calibrating the LED aperture, and a method and a system for verifying the LED aperture, wherein the method for detecting the LED aperture comprises the following steps: respectively acquiring R/G/B monochromatic apertures of the LED aperture; respectively dividing each monochromatic aperture by n equal parts, and respectively calculating the average brightness value of each part in each monochromatic aperture; calculating the total brightness average value of each monochromatic aperture; calculating the brightness deviation value of each part in each monochromatic aperture; and if the average value of the total brightness in each monochromatic aperture is less than or equal to the correspondingly set limit value, and the brightness deviation value of each part is less than or equal to the correspondingly set limit value, the LED aperture is successfully detected. The invention is used for realizing the effective detection of the LED aperture.
Description
Technical Field
The invention belongs to the technical field of LED apertures, and particularly relates to a method and a system for detecting an LED aperture, a method and a system for calibrating the LED aperture, and a method and a system for verifying the LED aperture.
Background
At present, intelligent household products represented by intelligent sound boxes are prevalent, in order to meet the visual effect of people on intelligent household products, a light-emitting film group is usually added on products such as sound boxes or game handles, an annular light guide ring is covered on a light-emitting assembly comprising a plurality of LED lamps, and the light-emitting assembly emits light to irradiate on the annular light guide ring to form the annular LED light ring.
The visual effect of the LED aperture which is finally shown is different under the influence of the difference of the materials coming from the LED lamp and the annular light guide aperture. In order to reduce the difference in visual effect, it is necessary to perform calibration when the detection is passed, so that the portion where the diaphragm brightness is low is brightened, and the portion where the diaphragm brightness is high is darkened, thereby concentrating the entire diaphragm brightness at a certain level.
Therefore, a method for detecting an LED aperture accurately, with low calibration difficulty and efficiency is needed.
Disclosure of Invention
The invention aims to provide a method for detecting an LED aperture, which is used for detecting the LED aperture by equally dividing a monochromatic aperture and utilizing the average value and the deviation value of the monochromatic aperture, so that the accuracy of the brightness of each range is ensured, and the LED aperture is effectively detected.
In order to solve the technical problems, the invention provides the following technical scheme for solving the problems:
the application relates to a detection method of an LED aperture, which is characterized by comprising the following steps: respectively acquiring R/G/B monochromatic apertures of the LED aperture; respectively dividing each monochromatic aperture by n equal parts, and respectively calculating the average brightness value of each part in each monochromatic aperture; calculating the total brightness average value of each single-color aperture to form three total brightness average values R _ AVG, G _ AVG and B _ AVG corresponding to each single-color aperture; calculating the brightness deviation value of each part in each monochromatic aperture according to the brightness average value and the total brightness average value of each part in the monochromatic aperture; and if the average value of the total brightness in each monochromatic aperture is less than or equal to the correspondingly set limit value, and the brightness deviation value of each part is less than or equal to the correspondingly set limit value, the LED aperture is successfully detected.
The LED aperture detection method provided by the invention can ensure the accuracy of the brightness of each range through the average value and the deviation value of each monochromatic aperture and the corresponding set limit value, can effectively detect the LED aperture, ensures that unqualified products of the LED aperture are intercepted, and ensures the reliability of products on the market.
Aiming at the detection method, the application also relates to a detection system of the LED aperture, which is characterized in that the detection method of the LED aperture is adopted to detect the LED aperture.
The application also relates to a calibration detection system of the LED aperture, which adopts the calibration detection method of the LED aperture to detect and calibrate the LED aperture.
The present invention also provides a method for calibrating an LED aperture, which calibrates the aperture according to the scaling factor and calibration limit of each monochromatic aperture to ensure the consistency of calibration.
In order to solve the technical problems, the invention provides the following technical scheme for solving the problems:
the application relates to a calibration method of an LED aperture, which comprises the following steps: acquiring Target values R _ Target, G _ Target and B _ Target of each monochromatic aperture; respectively calculating the scaling coefficient of each single-color aperture according to each target value and each total brightness average value R _ AVG, G _ AVG and B _ AVG; calculating the offset of each single-color aperture according to each scaling coefficient; calculating the calibration limit value of each monochromatic aperture according to the maximum scaling coefficient and each scaling coefficient; and inputting each deviation degree and each calibration limit value into a constant-current dimming driving module based on PWM (pulse-width modulation) for calibrating the LED aperture.
In this application, the target value of each monochromatic aperture is obtained in the calibration mode, specifically: setting the deviation degrees of the monochromatic apertures to be equal and to be preset values; setting the calibration limit values of all the monochromatic apertures to be equal and 255; respectively obtaining the average value of the total brightness of each monochromatic aperture of each LED aperture; and calculating the average value of the brightness of the same single color of the plurality of LED apertures to obtain the target value of each single color aperture of the LED apertures.
In the present application, the scaling factor of each monochromatic aperture is calculated according to each target value and each total luminance average value, specifically: a scaling factor LED _ Ratio _ R = (R _ Target-R _ AVG)/R _ Target for the red aperture; a scaling factor LED _ Ratio _ G = (G _ Target-G _ AVG)/G _ Target for the green aperture; the scaling factor LED _ Ratio _ B = (B _ Target-B _ AVG)/B _ Target for the blue aperture.
In this application, the offset of each monochromatic aperture is calculated according to each scaling factor, specifically: the degree of shift of the red aperture R _ Cal = LED _ Ratio _ R127 + 127; the green aperture shift G _ Cal = LED _ Ratio _ G127 + 127; the shift of the blue aperture B _ Cal = LED _ Ratio _ B127 + 127. In the present application, the calibration limit value of each monochromatic aperture is calculated according to the maximum scaling factor and each scaling factor, specifically: selecting the maximum scaling coefficient of the LED _ Ratio _ R, LED _ Ratio _ G and the LED _ Ratio _ B as ED _ Ratio _ MAX; calibration limit PWM _ limit _ R = 255-; calibration limit PWM _ limit _ G = 255-; the calibration limit for the blue aperture PWM _ limit _ B = 255-.
The calibration method of the LED aperture can calibrate the LED aperture in a product which is in line with detection, calculates calibration parameters (including offset and calibration limit) of each single-color aperture, restricts the calibration parameters in a uniform range, effectively ensures calibration consistency, concentrates the brightness of the calibrated product on the same level as much as possible, and improves the display effect of the molded product.
With respect to the calibration method described above, the present application also relates to a calibration system for an LED aperture, characterized in that the LED aperture is calibrated using the calibration method for an LED aperture described above.
The invention also aims to provide a verification method of the LED aperture, which is used for verifying and testing the calibrated LED aperture, so that the calibration reliability of the calibrated product is ensured, the probability of missing calibration is reduced, and the performance of the product is ensured.
In order to solve the technical problems, the invention provides the following technical scheme for solving the problems:
the application relates to a verification method of an LED aperture, which comprises the following steps: driving the LED aperture to emit a synthetic light source; respectively acquiring each single-color aperture of the LED aperture; respectively dividing each monochromatic aperture by n equal parts, and respectively calculating the average brightness value of each part in each monochromatic aperture; calculating the total brightness average value of each monochromatic aperture to form three total brightness average values corresponding to each monochromatic aperture; if the average value of all the total brightness is respectively less than or equal to the corresponding set limit value, the LED aperture calibration is qualified.
In the present application, each single-color aperture of the LED aperture is obtained in a closed non-light space or a closed space with constant light conditions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly described below, and it is obvious that the drawings described below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flowchart illustrating an embodiment of a method for detecting an LED aperture according to the present invention;
fig. 2 is a flowchart of an embodiment of a method for calibrating an LED aperture according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the detection process of the LED aperture of the product, the LED aperture needs to be detected in order to intercept the product with unqualified LED aperture, and the product is considered to be qualified when the brightness of the product meets the set requirement. In the prior art, the standard for detecting the LED aperture (that is, the test equipment obtains the luminous intensity of different points of the annular aperture, converts the luminous intensity into a numerical value represented by a color gradation, and determines whether the design requirement is met according to the numerical value) is low, and the unqualified products cannot be well intercepted.
Therefore, in order to improve the probability of intercepting unqualified products and effectively detect the unqualified LED aperture, the application relates to an inspection method of the LED aperture.
Referring to fig. 1, a flow chart of the detection method of the present application is shown.
The brightness and the deviation of each monochromatic aperture are limited within a certain range by calculating the brightness average value and the brightness deviation value of each monochromatic aperture of the LED aperture, and the brightness accuracy within the range is ensured.
S11: and respectively obtaining the R/G/B monochromatic apertures of the LED aperture.
An R/G/B monochromatic aperture picture, namely R monochromatic aperture (namely red aperture), G monochromatic aperture (namely green aperture) and B monochromatic aperture (namely blue aperture) is obtained by an industrial camera.
S12: each single-color aperture is divided by n, and the average value of the brightness of each portion of each single-color aperture is calculated.
The red, green and blue apertures are each divided by n, for example, n is 64. And the average value of the luminance of each of the individual single-color apertures is calculated, respectively.
For example, the red aperture is divided into 64 parts, and the average luminance values R0_ average, R1_ average, and R63_ average of each part are acquired.
The green aperture is divided into 64 parts, and the average brightness values G0_ average, G1_ average, G63_ average of each part are obtained.
The blue aperture is divided into 64 parts, and the average brightness values B0_ average, B1_ average, B63_ average of each part are obtained.
For example, each of the apertures may be divided into a plurality of different points, the emission intensities at the different points in each may be collected by a test device that collects emission intensities, and the collected emission intensities may be converted into numerical values represented by color gradations, and an average value of the plurality of numerical values in each may be calculated as a luminance average value of each.
S13: the total luminance average values R _ AVG, G _ AVG, and B _ AVG of the individual monochrome apertures are calculated.
Using the 64-part luminance average value calculated by the red aperture, the total luminance average value R _ AVG of the red aperture is calculated.
R_AVG=（R0_average+R1_average+...+R63_average）/64。
Using the 64 parts of the luminance average value calculated by the green aperture, the total luminance average value G _ AVG of the green aperture is calculated.
G_AVG=（G0_average+G1_average+...+G63_average）/64。
Using the 64 parts of the luminance average value calculated by the blue aperture, the total luminance average value B _ AVG of the blue aperture is calculated.
B_AVG=（B0_average+B1_average+...+B63_average）/64。
S14: and calculating the brightness deviation value of each part in each single-color aperture.
Calculating the brightness deviation value of each part in the red aperture:
ri _ Delta = Ri _ average-R _ AVG, where i varies from 0 to 63, and the luminance deviation value for each of the red apertures can be calculated: r0_ Delta, R1_ Delta, R63_ Delta.
Calculating the brightness deviation value of each part in the green aperture:
gi _ Delta = Gi _ average-G _ AVG, where i varies from 0 to 63, and the luminance deviation value for each of the green apertures can be calculated as: g0_ Delta, G1_ Delta, G63_ Delta.
Calculating the brightness deviation value of each part in the blue aperture:
bi _ Delta = Bi _ average-B _ AVG, where i varies from 0 to 63, and the luminance deviation value of each of the blue apertures can be calculated: b0_ Delta, B1_ Delta, B63_ Delta.
S15: and judging whether the average value of the total brightness in each monochromatic aperture is less than or equal to the correspondingly set limit value or not, and judging whether the deviation value of each part of the brightness is less than or equal to the correspondingly set limit value or not.
The respective limits are set for the total luminance average value R _ AVG of the red diaphragm, the total luminance average value G _ AVG of the green diaphragm, and the total luminance average value B _ AVG of the blue diaphragm, and the same limits may be set initially.
The limit value can be adjusted according to the visual effect of detection personnel, and the adjusted limit value is subject to interception of defective products.
Corresponding limit values are set for the brightness deviation values R0_ Delta, R1_ Delta,. and R63_ Delta for each red aperture, the brightness deviation values G0_ Delta, G1_ Delta,. and.g 63_ Delta for each green aperture, and the brightness deviation values B0_ Delta, B1_ Delta,. and B63_ Delta for each blue aperture, and the same limit values may be set initially.
The limit value can also be adjusted according to the visual effect of the detector, and the adjusted limit value is subject to interception of defective products.
If the above R _ AVG, G _ AVG, B _ AVG, R0_ Delta, R1_ Delta,. the same, R63_ Delta, G0_ Delta, G1_ Delta,. the same, G63_ Delta, B0_ Delta, B1_ Delta,. the same, and B63_ Delta are all within the set limit values, the LED aperture detection is successful, that is, the LED aperture belongs to a good product, otherwise, the LED aperture detection is failed, that is, the LED aperture belongs to a bad product.
According to the method, the accuracy of the brightness in each range is effectively guaranteed and the LED aperture is effectively detected by obtaining each single-color aperture of the LED aperture, calculating the total brightness average value R _ AVG, G _ AVG and B _ AVG and the deviation value of each single-color aperture after equal division.
For the detection method of the LED aperture, a detection system of the LED aperture is designed, and the detection method of the LED aperture in the figure 1 is adopted for detecting the LED aperture.
Even the LED diaphragm that detects belongs to the yields, but the LED diaphragm receives the difference influence that LED lamp and annular light guiding ring supplied materials, and the visual effect of the LED diaphragm that finally demonstrates also is different, consequently, in order to reduce visual effect difference, needs to brighten the place that the luminance is low of diaphragm through the calibration, and the place that the luminance is high darkens to make LED diaphragm luminance whole concentrate on certain level.
Referring to fig. 2, a flow chart of the calibration method of the present application is shown.
By calculating the calibration parameters of each single-color aperture of the LED aperture, including the offset and the calibration limit of each single-color aperture, the calibration parameters are restricted in a uniform range, and the calibration consistency is effectively ensured.
In the prior art, a constant current dimming driving module of PWM receives an offset and a calibration limit of R/G/B monochromatic light to adjust a driving current for each LED lamp, thereby adjusting the brightness of each LED lamp.
The brightness of the LED aperture driven by the PWM constant current dimming driving module is a common technical means for those skilled in the art, and therefore, this part is not the focus of the present application, and the focus of the present application is to obtain the offsets R _ Cal, G _ Cal and B _ Cal of the R/G/B monochromatic light received by the PWM constant current dimming driving module and the calibration limits PWM _ limit _ R, PWM _ limit _ G and PWM _ limit _ B, where the specific offsets and calibration limits of the R/G/B monochromatic light are obtained as described below.
As follows, the calibration parameters received by the constant-current dimming driving module of PWM are recorded as: CAL (R _ Cal, G _ Cal, B _ Cal) and PWM _ limit (PWM _ limit _ R, PWM _ limit _ G and PWM _ limit _ B).
S21: the target value of each monochromatic aperture is acquired.
The average value of the total brightness of each single-color aperture of each of a plurality of products in a batch is measured with default parameters including each degree of shift of each single-color aperture with a scaling factor of 0, and parameters of each single-color aperture with a calibration limit of 255.
255 here indicates the maximum gradation for an 8-bit color RGB space digital image, and 2 for each of the 8-bit color RGB space digital images8(i.e., 256 gradations representing red, green, and blue, each gradation of a color having a range of values [0,255 ]]The color level represents the brightness (e.g., light and shade) of a picture.
For example, when the intermediate gradation 127 is used as the reference value, the shift degrees of the individual monochromatic apertures having the shift degree of 0 are 127, respectively, but of course, the gradation 143 may be used as the parameter value.
Thus, after the parameter values are selected, the same batch of products is controlled with CAL (127,127,127) and PWM _ limit (255 ) as default parameters.
For example, three products in the batch were measured: average total brightness of each single color aperture of the LED apertures of product 1, product 2 and product 3.
That is, according to the manner of calculating the total luminance average value as in S3 above, the total luminance average value R1_ AVG of the red aperture in product 1, the total luminance average value R2_ AVG of the red aperture in product 2, and the total luminance average value R3_ AVG of the red aperture in product 3 are calculated.
The average value of the total luminance of the green apertures G1_ AVG in product 1, the average value of the total luminance of the green apertures G2_ AVG in product 2, and the average value of the total luminance of the green apertures G3_ AVG in product 3 were calculated.
And the average value of the total luminance of the blue apertures B1_ AVG in product 1, B2_ AVG in product 2, and R3_ AVG in product 3 were calculated.
Averaging the average value of the total brightness of the red apertures in the three products, namely (R1 _ AVG + R2_ AVG + R3_ AVG)/3, to obtain the Target value R _ Target corresponding to the red apertures.
The average value of the total brightness of the green apertures in the three products is averaged, namely (G1 _ AVG + G2_ AVG + G3_ AVG)/3, and the Target value G _ Target corresponding to the green aperture is obtained.
The average value of the total brightness of the blue apertures in the three products is averaged, namely (B1 _ AVG + B2_ AVG + B3_ AVG)/3, and the Target value B _ Target corresponding to the blue aperture is obtained.
The Target values R _ Target, G _ Target, and B _ Target may be adjusted until the designed requirements are met when the numerical values represented by the color gradation of the LED aperture of the product do not meet the designed requirements when the product is detected.
S22: and respectively calculating the scaling coefficient of the monochromatic aperture according to each target value and each total brightness average value.
For the purpose of individually calibrating the individual monochromatic apertures, a scaling factor needs to be set for each individual monochromatic aperture.
The scaling factor of each single-color aperture is acquired from the R _ Target, G _ Target, and B _ Target acquired as described above, and the total luminance average values R _ AVG, G _ AVG, and B _ AVG of each single-color aperture.
A scaling factor LED _ Ratio _ R = (R _ Target-R _ AVG)/R _ Target for the red aperture;
a scaling factor LED _ Ratio _ G = (G _ Target-G _ AVG)/G _ Target for the green aperture;
the scaling factor LED _ Ratio _ B = (B _ Target-B _ AVG)/B _ Target for the blue aperture.
S23: and calculating the offset of each single-color aperture according to each scaling coefficient.
The degree of shift is calculated based on the scaling factor, typically with reference to the intermediate tone scale 127.
The degree of shift of each single-color aperture is acquired from the LED _ Ratio _ R, LED _ Ratio _ G and LED _ Ratio _ B acquired as described above.
The degree of shift of the red aperture R _ Cal = LED _ Ratio _ R127 + 127;
the green aperture shift G _ Cal = LED _ Ratio _ G127 + 127;
the shift of the blue aperture B _ Cal = LED _ Ratio _ B127 + 127.
In this manner, the shift degrees CAL (R _ CAL, G _ CAL, B _ CAL) for calibrating the LED aperture are acquired.
When the reference criterion is set to 127, the actual degree of shift to the red aperture, for example, calculated by the scaling factor, is R _ Cal = LED _ Ratio _ R127 +127 instead of 127.
The scaling coefficient restricts the offset degree in a uniform range, and the calibration consistency is effectively ensured.
S24: and calculating the calibration limit value of each monochromatic aperture according to the maximum scaling coefficient and each scaling coefficient.
For an RGB space digital image of 8-bit color, the maximum gradation is 255, if not limited, the gradation after calibration may exceed 255, and at this time, the maximum gradation violates the maximum gradation 255, which may cause the software in the product to malfunction, so it is necessary to set the calibration limit value corresponding to the color with the largest fluctuation range to 255, and convert the other colors to a value less than 255 according to the ratio, thereby limiting the calibration limit value of each R/G/B.
The maximum scaling factor LED _ Ratio _ MAX is determined from the maximum absolute value of LED _ Ratio _ R, LED _ Ratio _ G and LED _ Ratio _ B.
The calibration limit for each individual color is calculated using the parametric equation PWM _ limit = 255-.
For example, LED _ Ratio _ R =0.03, LED _ Ratio _ G =0.06, LED _ Ratio _ B = -0.04, then the largest scaling parameter LED _ Ratio _ MAX is selected as LED _ Ratio _ G = 0.06.
Then, the calibration limit PWM _ limit _ R = 255-;
the calibration limit value PWM _ limit _ G = 255-;
the calibration limit PWM _ limit _ B = 255-.
In this way, the calibration limit values PWM _ limit (PWM _ limit _ R, PWM _ limit _ G, PWM _ limit _ B) for calibrating the LED aperture are acquired.
S25: and inputting each deviation degree and each calibration limit value into a constant-current dimming driving module based on PWM (pulse-width modulation) for calibrating the LED aperture.
The single color R/G/B of each LED lamp can be divided into 255 parts, and if the driving current for driving the LED lamp to emit light is I, the current is I/255.
According to the offset and the calibration limit, the driving currents I/255 × R _ Cal, I/255 × G _ Cal and I/255 × B _ Cal corresponding to the offset of R/G/B and the driving current limits I/255 × PWM _ limit _ R, I/255 × PWM _ limit _ G and I/255 × PWM _ limit _ B corresponding to the calibration limit can be obtained.
Therefore, the parameters are applied to the constant-current dimming driving module based on PWM to control the current passing through the LED lamp, so that the aim of calibrating the LED aperture is fulfilled.
The LED aperture in the qualified product is calibrated, the calibration parameters (including the offset degree and the calibration limit value) of each single-color aperture are calculated, the calibration parameters are restricted in a uniform range, the calibration consistency is effectively ensured, and the brightness of the calibrated product is concentrated on the same level as much as possible.
For the calibration method of the LED aperture as described above, a calibration system of the LED aperture is designed, which performs the LED aperture calibration using the calibration method in fig. 2 as described above. The system adopts the calibration method, so that the accuracy of the detection result can be effectively ensured, the misdetection of the product is effectively reduced, and the reliability and the stability of the calibration system are improved.
In the present application, in order to ensure the consistency of the LED aperture calibration, the consistency between devices should be ensured on hardware first, i.e. the camera and the device for placing the product need to be debugged before the calibration.
The consistency of a plurality of sets of calibration systems is improved by debugging the consistency between the industrial cameras and the equipment in the calibration system.
The application also relates to a verification method of the LED aperture, which is used for verifying the effect of the calibrated LED aperture.
Specifically, the LED aperture is lit using a composite light source (e.g., yellow light or the like), and since yellow light is the composite light generated by red light and green light, for example, the total luminance average value R _ AVG of the red aperture and the total luminance average value G _ AVG of the green aperture in the LED aperture are calculated in such a manner that the total luminance average values are calculated as in S13 above.
And setting limit limits for the total brightness average values R _ AVG and G _ AVG, and if the design requirements are met, determining that the calibration is qualified.
Aiming at the verification method of the LED aperture, a verification system of the LED aperture is designed, and the verification method is adopted to carry out verification on the LED aperture.
It should be noted that the aperture and the focal length of the camera are adjusted in the same dark room or in a space with constant illumination conditions, so as to ensure the consistency of the definition of the camera.
The camera field of vision is adjusted through a manual debugging tool, and the central position of the picture can be arranged in the LED aperture.
The distance between the plane of the lens of the camera and the surface of the product is measured, so that the consistency of the distance between the camera and the product is ensured.
In addition, in order to ensure the stability and consistency of the single-color diaphragms of the LED diaphragm obtained by the industrial camera, the LED diaphragm picture can be obtained in a sealed space without light or in a sealed space with constant illumination conditions, so that the influence of the external illumination environment on the camera during photographing is avoided, and the initial environment of photographing at each time is ensured to be consistent.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for detecting an LED aperture is characterized by comprising the following steps:
respectively acquiring R/G/B monochromatic apertures of the LED aperture;
respectively dividing each monochromatic aperture by n equal parts, and respectively calculating the average brightness value of each part in each monochromatic aperture;
calculating the total brightness average value of each monochromatic aperture to form three total brightness average values corresponding to each monochromatic aperture;
calculating the brightness deviation value of each part in each monochromatic aperture according to the brightness average value and the total brightness average value of each part in the monochromatic aperture;
and if the average value of the total brightness in each monochromatic aperture is less than or equal to the correspondingly set limit value and the brightness deviation value of each part is less than or equal to the correspondingly set limit value, the LED aperture is successfully detected.
2. An LED aperture detection system, characterized in that the LED aperture detection method of claim 1 is adopted to detect the LED aperture.
3. A method for calibrating an LED aperture, wherein the LED aperture is successfully detected by the detection method of claim 1 or the detection system of claim 2, and the method comprises:
acquiring a target value of each monochromatic aperture;
respectively calculating the scaling coefficient of each monochromatic aperture according to each target value and each total brightness average value;
calculating the offset of each single-color aperture according to each scaling coefficient;
calculating the calibration limit value of each monochromatic aperture according to the maximum scaling coefficient and each scaling coefficient;
and inputting each deviation degree and each calibration limit value into a constant-current dimming driving module based on PWM (pulse-width modulation) for calibrating the LED aperture.
4. The method for calibrating an LED aperture according to claim 3, wherein the target value of each monochromatic aperture is obtained in the calibration mode, specifically:
setting the deviation degrees of the monochromatic apertures to be equal and to be preset values;
setting the calibration limit values of all the monochromatic apertures to be equal and 255;
respectively acquiring the average value R _ AVG, G _ AVG and B _ AVG of the total brightness of each single-color aperture of each LED aperture;
and calculating the brightness average value of the same single color of the plurality of LED apertures to obtain Target values R _ Target, G _ Target and B _ Target of each single-color aperture of the LED apertures.
5. The method of calibrating an LED aperture according to claim 4,
and respectively calculating the scaling coefficient of each monochromatic aperture according to each target value and each total brightness average value, wherein the method specifically comprises the following steps:
a scaling factor LED _ Ratio _ R = (R _ Target-R _ AVG)/R _ Target for the red aperture;
a scaling factor LED _ Ratio _ G = (G _ Target-G _ AVG)/G _ Target for the green aperture;
the scaling factor LED _ Ratio _ B = (B _ Target-B _ AVG)/B _ Target for the blue aperture.
6. The method of calibrating an LED aperture according to claim 5,
calculating the offset of each monochromatic aperture according to each scaling coefficient, which specifically comprises the following steps:
the degree of shift of the red aperture R _ Cal = LED _ Ratio _ R127 + 127;
the green aperture shift G _ Cal = LED _ Ratio _ G127 + 127;
the shift of the blue aperture B _ Cal = LED _ Ratio _ B127 + 127.
7. The method of calibrating an LED aperture according to claim 5,
calculating the calibration limit value of each monochromatic aperture according to the maximum scaling coefficient and each scaling coefficient, specifically:
selecting the maximum scaling coefficient of the LED _ Ratio _ R, LED _ Ratio _ G and the LED _ Ratio _ B as LED _ Ratio _ MAX;
calibration limit PWM _ limit _ R = 255-;
calibration limit PWM _ limit _ G = 255-;
the calibration limit for the blue aperture PWM _ limit _ B = 255-.
8. A calibration system for an LED aperture, characterized in that it is used for calibrating the LED aperture according to the method for calibrating an LED aperture as claimed in any one of claims 3 to 7.
9. A method for verifying an LED aperture, wherein the LED aperture is calibrated by the calibration method according to any one of claims 3 to 7 or the calibration system according to claim 8, and the method comprises:
driving the LED aperture to emit a synthetic light source;
respectively acquiring each single-color aperture of the LED aperture;
respectively dividing each monochromatic aperture by n equal parts, and respectively calculating the average brightness value of each part in each monochromatic aperture;
calculating the total brightness average value of each monochromatic aperture to form three total brightness average values corresponding to each monochromatic aperture;
and if the average value of all the total brightness is less than or equal to the corresponding set limit value, the LED aperture calibration is qualified.
10. An LED aperture verification system, characterized in that it verifies the LED aperture using the LED aperture verification method according to claim 9.
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