CN112577719B - LED aperture checking method and system, calibration method and system, and verification method and system - Google Patents
LED aperture checking method and system, calibration method and system, and verification method and system Download PDFInfo
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Abstract
The invention relates to a detection method and a system, a calibration method and a system, and a verification method and a system of an LED aperture, wherein the detection method comprises the following steps: R/G/B monochromatic diaphragms of the LED diaphragms are respectively obtained; dividing each single-color aperture by n equal parts, and calculating the average value of the brightness of each single-color 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 single-color aperture is smaller than or equal to the corresponding set limit value, and the brightness deviation value of each part is smaller than or equal to the corresponding set limit value, the LED aperture detection is successful. The LED aperture detection device is used for effectively detecting the LED aperture.
Description
Technical Field
The invention belongs to the technical field of LED diaphragms, and particularly relates to a detection method and system, a calibration method and system, and a verification method and system of an LED diaphragm.
Background
At present, intelligent home products represented by intelligent sound boxes are popular, in order to meet the visual effect of people on the intelligent home products, a luminous film group is generally additionally arranged on products such as sound boxes or game handles, and particularly an annular light guide ring is covered on a luminous component comprising a plurality of LED lamps, and the luminous component emits light to irradiate on the annular light guide ring to form the annular LED light ring.
The visual effect of the finally presented LED aperture is different due to the influence of the difference of the incoming materials of the LED lamp and the annular light guide aperture. In order to reduce the difference in visual effect, it is necessary to calibrate the aperture in the case of passing detection, to lighten the area where the brightness of the aperture is low and darken the area where the brightness is high, so that the aperture brightness is concentrated on a certain level as a whole.
Therefore, there is a need for an accurate, low-calibration-difficulty and efficient method for LED aperture detection.
Disclosure of Invention
The invention aims to provide a detection method of an LED aperture, which is used for detecting the LED aperture by equally dividing the monochromatic aperture and utilizing the average value and the deviation value of the monochromatic aperture, so that the accuracy of brightness in 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:
the application relates to a detection method of an LED aperture, which is characterized by comprising the following steps: R/G/B monochromatic diaphragms of the LED diaphragms are respectively obtained; dividing each single-color aperture by n equal parts, and calculating the average value of the brightness of each single-color 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 single-color aperture according to the brightness average value and the total brightness average value of each part in the single-color aperture; and if the average value of the total brightness in each single-color aperture is smaller than or equal to the corresponding set limit value, and the brightness deviation value of each part is smaller than or equal to the corresponding set limit value, the LED aperture detection is successful.
The detection method of the LED aperture can ensure the accuracy of brightness in each range through the average value and the deviation value of each single-color aperture and the corresponding set limit value, can effectively detect the LED aperture, ensure that unqualified products of the LED aperture are intercepted, and ensure the reliability of the products on the market.
The application also relates to a detection system of the LED aperture aiming at the detection method, which is characterized in that the detection method of the LED aperture is adopted for detecting 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 second objective of the present invention is to provide a calibration method for an LED aperture, which calibrates the aperture according to the scaling coefficient and the calibration limit value of each monochromatic aperture, so as to ensure the calibration consistency.
In order to solve the technical problems, the invention provides the following technical scheme:
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 single-color aperture; according to each target value and each total brightness average value R_AVG, G_AVG and B_AVG, respectively calculating the scaling factor of each monochromatic aperture; calculating the offset of each monochromatic 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 offset and each calibration limit value into a constant-current dimming driving module based on PWM (pulse-width modulation) for calibrating the LED aperture.
In the present application, the target value of each single-color aperture is obtained in the calibration mode, specifically: setting the offset degree of each monochromatic aperture equal to a preset value; setting the calibration limit value of each monochromatic aperture to be equal and 255; respectively obtaining the average value 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 diaphragms to obtain the target value of each single-color diaphragm of the LED diaphragms.
In the present application, the scaling factors of the single-color diaphragms are calculated according to the target values and the average value of the total brightness, specifically: the scaling factor led_ratio_r= (r_target-r_avg)/r_target of the red aperture; the scaling factor led_ratio_g= (g_target-g_avg)/g_target of the green aperture; the scaling factor led_ratio_b= (b_target-b_avg)/b_target of the blue aperture.
In the present application, the offset degree of each single-color aperture is calculated according to each scaling factor, specifically: the offset r_cal=led_ratio_r of the red aperture is 127+127; the offset g_cal=led_ratio_g of the green aperture 127+127; the offset b_cal=led_ratio_b of the blue aperture is 127+127. In the present application, the calibration limit value of each single-color aperture is calculated according to the maximum scaling factor and each scaling factor, specifically: selecting the largest scaling coefficient of the LED_Ratio_ R, LED _Ratio_G and the LED_Ratio_B to be ED_Ratio_MAX; the calibration limit pwm_limit_r=255-255 for the red aperture (led_ratio_max-led_ratio_r); the calibration limit pwm_limit_g=255-255 (led_ratio_max-led_ratio_g) for the green aperture; the calibration limit pwm_limit_b=255-255 for blue aperture (led_ratio_max-led_ratio_b).
The calibration method of the LED aperture can calibrate the LED aperture in the coincidence detection product, calculate the calibration parameters (including the offset and the calibration limit value) of each monochromatic aperture, and the calibration parameters are restricted in a uniform range, thereby effectively ensuring the calibration consistency, ensuring that the brightness of the calibrated product is concentrated at the same level as much as possible, and improving the display effect of the product after molding.
The application also relates to a calibration system of the LED aperture, which is characterized in that the LED aperture is calibrated by adopting the calibration method of the LED aperture.
The third purpose of the invention is to provide a verification method of the LED aperture, which is used for carrying out verification test on the calibrated LED aperture, ensuring the calibration reliability of the calibrated product, reducing the probability of missing calibration and being beneficial to ensuring the performance of the product.
In order to solve the technical problems, the invention provides the following technical scheme:
the application relates to a verification method of an LED aperture, which comprises the following steps: driving the LED aperture to emit a composite light source; respectively acquiring each monochromatic aperture of the LED aperture; dividing each single-color aperture by n equal parts, and calculating the average value of the brightness of each single-color aperture; calculating the total brightness average value of each single-color aperture to form three total brightness average values corresponding to each single-color aperture; and if the average value of the total brightness is smaller than or equal to the corresponding set limit value, the LED aperture calibration is qualified.
In the application, each monochromatic aperture of the LED aperture is obtained in a closed dark space or a closed space with constant illumination condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments of the present invention or the description of the prior art, and it is obvious that the drawings described below are some embodiments of the present invention, and that other drawings may be obtained according to these drawings without the need for inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of 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
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the detection process of the LED aperture of the product, in order to intercept the product with unqualified LED aperture, the LED aperture needs to be detected, and the product is considered to be qualified when the brightness meets the set requirement. In the prior art, the standard of detection of the LED aperture (namely, the test equipment acquires the luminous intensity of different points of the annular aperture, converts the luminous intensity into a numerical value represented by a color level, and judges whether the design requirement is met or not according to the numerical value), so that unqualified products cannot be well intercepted.
Therefore, in order to improve the probability of blocking unqualified products, the unqualified LED aperture can be effectively detected, and 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.
And the brightness average value and the brightness deviation value of each single-color aperture of the LED aperture are calculated, so that the brightness and the deviation of each single-color aperture are limited in a certain range, and the brightness accuracy in the range is ensured.
S11: and respectively acquiring R/G/B monochromatic diaphragms of the LED diaphragms.
R/G/B monochromatic aperture pictures, abbreviated as R monochromatic aperture (i.e. red aperture), G monochromatic aperture (i.e. green aperture) and B monochromatic aperture (i.e. blue aperture), are obtained by an industrial camera using the R/G/B monochromatic light method.
S12: each single-color aperture was divided into n equal portions, and the average value of the luminance of each portion in each single-color aperture was calculated.
The red aperture, the green aperture, and the blue aperture are divided by n equal portions, respectively, for example, n is 64. And the average value of the brightness of each of the individual monochromatic diaphragms is calculated separately.
For example, the red aperture is divided into 64 parts, and luminance averages r0_average, r1_average, and r63_average for each part are obtained.
The green diaphragm was divided into 64 parts, and luminance averages g0_average, g1_average, and g63_average for each part were obtained.
The blue aperture was divided into 64 parts, and luminance averages b0_average, b1_average, and b63_average for each part were obtained.
For example, each of the apertures may be divided into a plurality of different points, the light emission intensities at the different points in each of the apertures are collected by a test device for collecting the light emission intensities, the collected light emission intensities are converted into values represented by the color gradation, an average of the plurality of values in each of the apertures is calculated, and the average of each of the portions is taken as an average of the luminance of each of the portions.
S13: the total brightness average values r_avg, g_avg, and b_avg of the respective monochromatic diaphragms are calculated.
The total average brightness r_avg of the red aperture was calculated using the average brightness of 64 calculated for the red aperture.
R_AVG=（R0_average+R1_average+...+R63_average）/64。
The total luminance average g_avg of the green diaphragm is calculated using the calculated average of 64 luminance parts of the green diaphragm.
G_AVG=（G0_average+G1_average+...+G63_average）/64。
The total brightness average b_avg of the blue diaphragms is calculated using the calculated 64 brightness averages of the blue diaphragms.
B_AVG=（B0_average+B1_average+...+B63_average）/64。
S14: the brightness deviation value of each of the single-color diaphragms is calculated.
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 brightness deviation value of each part in the red aperture 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 brightness deviation value of each part in the green aperture can be calculated: g0_delta, g1_delta,..g63_delta.
Calculating 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 for each segment in the blue color circle can be calculated: b0_delta, b1_delta,..b63_delta.
S15: and judging whether the average value of the total brightness in each single-color aperture is smaller than or equal to a corresponding set limit value, and judging whether the brightness deviation value of each part is smaller than or equal to the corresponding set limit value.
The respective limit values are set for the total average luminance r_avg of the red aperture, the total average luminance g_avg of the green aperture, and the total average luminance b_avg of the blue aperture, and the same limit value may be set initially.
The limit value can be adjusted according to the visual effect of the detection personnel, and the adjusted limit value is in order to intercept defective products.
The respective limit values are set for the luminance deviation values r0_delta, r1_delta, and..mu.m., r63_delta for each part of the red diaphragm, the luminance deviation values g0_delta, g1_delta, and..mu.m., for each part of the green diaphragm, and the luminance deviation values b0_delta, b1_delta, and..mu.m., and b63_delta for each part of the blue diaphragm, respectively, and the same limit value may be set initially.
The limit value may be adjusted according to the visual effect of the inspector, and the adjusted limit value may be set so as to intercept defective products.
If the r_avg, g_avg, b_avg, r0_delta, r1_delta, r63_delta, g0_delta, g1_delta, g63_delta, b0_delta, b1_delta, and b63_delta are all within the set limits, it indicates that the LED aperture is successfully detected, i.e., the LED aperture is good, or else, it indicates that the LED aperture is failed to detect, i.e., the LED aperture is bad.
According to the method, the accuracy of brightness in each range is effectively ensured, and the LED aperture is effectively detected by acquiring each single-color aperture of the LED aperture and calculating the total brightness average values R_AVG, G_AVG and B_AVG and the deviation value of each single-color aperture after halving.
For the detection method of the LED aperture as described above, a detection system of the LED aperture is designed, which performs LED aperture detection using the detection method in fig. 1 as described above.
Even if the detected LED aperture belongs to good products, the LED aperture is affected by the difference of the incoming materials of the LED lamp and the annular light guide aperture, and finally the visual effect of the LED aperture is different, so that in order to reduce the difference of the visual effect, the position with low brightness of the aperture needs to be lightened by calibration, and the position with high brightness is darkened, so that the brightness of the LED aperture is concentrated on a certain level as a whole.
Referring to fig. 2, a flow chart of the calibration method of the present application is shown.
The calibration parameters of each single-color aperture of the LED aperture are calculated, including the offset degree and the calibration limit value of each single-color aperture, so that the calibration parameters are restricted in a unified range, and the calibration consistency is effectively ensured.
In the prior art, a constant current dimming driving module of PWM receives the offset degree and the calibration limit value of R/G/B monochromatic light to adjust the driving current of each LED lamp, so as to adjust the brightness of each LED lamp.
The driving of the brightness of the LED aperture by the PWM constant current dimming driving module belongs to a technical means commonly used by those skilled in the art, and therefore this part is not the focus of the present application, which focuses on obtaining the offset 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, and in particular, the obtaining of the offset R/G/B monochromatic light and the calibration limits is described below.
As follows, calibration parameters received by the constant current dimming driving module of PWM are noted as follows: CAL (r_cal, g_cal, b_cal) and pwm_limit (pwm_limit_ R, PWM _limit_g and pwm_limit_b).
S21: target values of the individual monochromatic diaphragms are acquired.
The average value of the total brightness of each single-color aperture of each of a plurality of products in a batch of products is measured by default parameters including each offset degree of the scaling factor of each single-color aperture being 0 and the calibration limit value of each single-color aperture being 255.
Where 255 denotes the maximum degree of gradation for an RGB space digital image of 8-bit color, the RGB space digital image of 8-bit color is respectively 2 8 (i.e., 256) gradations represent red, green, and blue, and the range of gradations for each color is the interval [0,255 ]]The tone scale represents the brightness (e.g., darkness) of a picture.
For example, when the intermediate tone 127 is used as the reference value, the degree of shift of each single-color aperture is 127, and the tone 143 may be used as the parameter value.
Thus, after the parameter values are selected, the same batch of product is controlled with CAL (127,127,127) and PWM_limit (255 ) as default parameters.
For example, three products in the batch were measured: the average value of the 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 brightness average value in S3 as above, the total brightness average value r1_avg of the red aperture in the product 1, the total brightness average value r2_avg of the red aperture in the product 2, and the total brightness average value r3_avg of the red aperture in the product 3 are calculated.
The average value of the total brightness g1_avg of the green diaphragms in the product 1, the average value of the total brightness g2_avg of the green diaphragms in the product 2, and the average value of the total brightness g3_avg of the green diaphragms in the product 3 are calculated.
And calculates the average B1_AVG of the total brightness of the blue aperture in product 1, the average B2_AVG of the total brightness of the blue aperture in product 2, and the average R3_AVG of the total brightness of the blue aperture in product 3.
The average value of the total brightness of the red diaphragms in the three products is averaged, namely (R1_AVG+R2_AVG+R3_AVG)/3, and the Target value R_Target corresponding to the red diaphragms is obtained.
The average value of the total brightness of the green diaphragms in the three products is averaged, namely (G1_AVG+G2_AVG+G3_AVG)/3, and the Target value G_target corresponding to the green diaphragms is obtained.
The average value of the total brightness of the blue diaphragms in the three products is averaged, namely (B1_AVG+B2_AVG+B3_AVG)/3, and the Target value B_target corresponding to the blue diaphragms is obtained.
The Target values r_target, g_target, and b_target may be adjusted when detecting a product, when the value of the color level representation of the LED aperture of the product does not meet the designed requirement, until the designed requirement is met.
S22: and calculating the scaling factor of the monochromatic aperture according to each target value and each total brightness average value.
In order to achieve the purpose of calibrating each single-color aperture separately, a scaling factor needs to be set for each single-color aperture.
The scaling factor of each single-color aperture is obtained from the r_target, g_target, and b_target obtained as above, and the total brightness average value r_avg, g_avg, and b_avg of each single-color aperture.
The scaling factor led_ratio_r= (r_target-r_avg)/r_target of the red aperture;
the scaling factor led_ratio_g= (g_target-g_avg)/g_target of the green aperture;
the scaling factor led_ratio_b= (b_target-b_avg)/b_target of the blue aperture.
S23: and calculating the offset degree of each monochromatic aperture according to each scaling coefficient.
The offset is calculated based on the scaling factor, typically with the intermediate tone scale 127 as a reference standard.
The degree of offset of each single-color aperture is obtained from the led_ratio_ R, LED _ratio_g and led_ratio_b obtained as described above.
The offset r_cal=led_ratio_r of the red aperture is 127+127;
the offset g_cal=led_ratio_g of the green aperture 127+127;
the offset b_cal=led_ratio_b of the blue aperture is 127+127.
Thus, the offset degree CAL (r_cal, g_cal, b_cal) for calibrating the LED aperture is obtained.
When the reference standard is set to 127, for example, the actual degree of deviation from the red aperture calculated by the scaling factor is r_cal=led_ratio_r×127+127, instead of 127.
The scaling coefficient constrains the offset to be within a uniform range, and 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, and if the maximum gradation is not limited, the calibrated gradation may exceed 255, and at this time, the internal software operation of the product may be failed against the maximum gradation 255, so that the calibration limit corresponding to the color with the largest fluctuation range needs to be set to 255, and the other values are scaled to values smaller than 255, thus defining the calibration limit of each R/G/B.
The maximum scaling factor led_ratio_max is the value with the maximum absolute value from led_ratio_ R, LED _ratio_g and led_ratio_b.
The calibration limits for each individual color are calculated using the parameter formula pwm_limit=255-255 (led_ratio_max-led_ratio_color).
For example, led_ratio_r=0.03, led_ratio_g=0.06, led_ratio_b= -0.04, the maximum scaling parameter led_ratio_max is selected as led_ratio_g=0.06.
Then, the calibration limit pwm_limit_r=255-255 (led_ratio_max-led_ratio_r) =255-255 (0.06-0.03) =247.35;
the calibration limit pwm_limit_g=255-255 (led_ratio_max-led_ratio_g) =255-255 (0.06-0.06) =255;
the calibration limit pwm_limit_b=255-255 (led_ratio_max-led_ratio_b) =255-255 (0.06+0.04) =229.5 for the blue aperture.
Thus, the calibration limit values pwm_limit (pwm_limit_r, pwm_limit_g, pwm_limit_b) for calibrating the LED aperture are obtained.
S25: and inputting each offset and each calibration limit value into a constant-current dimming driving module based on PWM (pulse-width modulation) for calibrating the LED aperture.
For each single color R/G/B of each LED lamp, it can be divided into 255 parts, and if the driving current for driving the LED lamp to emit light is I, then each part of current is I/255.
According to the offset and the calibration limit, driving currents I/255×r_cal, I/255×g_cal, and I/255×b_cal of the offset corresponding to R/G/B and driving current limit values 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 so as to control the current passing through the LED lamp, and the purpose of calibrating the aperture of the LED is achieved.
And (3) calibrating the LED diaphragms in the qualified products, calculating calibration parameters (including offset and calibration limit value) of each monochromatic diaphragm, and restricting the calibration parameters in a uniform range, so that the calibration consistency is effectively ensured, and the brightness of the calibrated products is concentrated at 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 LED aperture calibration using the calibration method in fig. 2 as described above. Because the system adopts the calibration method, the accuracy of the detection result can be effectively ensured, the false detection of products can be effectively reduced, and the reliability and the stability of the calibration system are improved.
In this application, in order to ensure consistency of the calibration of the LED aperture, firstly, consistency between devices should be ensured in hardware, i.e. the camera and the device for placing the product need to be commissioned before calibration.
The consistency of the multiple sets of calibration systems is improved by debugging the consistency between the industrial cameras and the equipment in the calibration systems.
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 synthetic light source (for example, yellow light or the like), for example, the LED aperture is lit with yellow light, and since yellow light is a composite light generated by red light and green light, the total brightness average value r_avg of the red aperture and the total brightness average value g_avg of the green aperture in the LED aperture are calculated according to the manner of calculating the total brightness average value in S13 as above.
And setting limit value limits on the average value R_AVG and G_AVG of the total brightness, and if the design requirement is met, the calibration is qualified.
For the verification method of the LED aperture, a verification system of the LED aperture is designed, and the verification method is adopted for verifying the LED aperture.
The aperture and focal length of the camera are adjusted under the same illumination darkroom or under a space with constant illumination condition, so that the consistency of the definition of the camera is ensured.
The camera visual field is adjusted through a manual debugging tool, so that the LED aperture can be placed at the center of the photo.
The consistency of the distance between the camera and the product is ensured by measuring the distance between the plane of the camera lens and the surface of the product.
In order to ensure the stability and consistency of each single-color aperture of the LED aperture acquired by the industrial camera, the LED aperture picture can be acquired in a closed non-light space or a closed space with constant illumination condition, so that the influence of the external illumination environment on the camera in photographing is avoided, and the consistency of the initial environment of photographing each time is ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A calibration method of an LED aperture is characterized in that,
the LED aperture is first inspected and,
s11: R/G/B monochromatic diaphragms of the LED diaphragms are respectively obtained;
s12: dividing each single-color aperture by n equal parts, and calculating the average value of the brightness of each single-color aperture;
s13: 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;
s14: calculating the brightness deviation value of each part in each single-color aperture according to the brightness average value and the total brightness average value of each part in the single-color aperture;
s15: if the average value of the total brightness in each single-color aperture is smaller than or equal to the corresponding set limit value, and the brightness deviation value of each part is smaller than or equal to the corresponding set limit value, the LED aperture detection is successful;
the LED aperture that detected successfully is then calibrated,
s21: setting the offset degree of each monochromatic aperture equal to a preset value; setting the calibration limit value of each monochromatic aperture 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; calculating the brightness average value of the same single color of a plurality of LED diaphragms to obtain Target values R_target, G_target and B_target of each single-color diaphragm of the LED diaphragms;
s22: according to each target value and each total brightness average value, respectively calculating the scaling coefficient of each monochromatic aperture: the scaling factor led_ratio_r= (r_target-r_avg)/r_target of the red aperture; the scaling factor led_ratio_g= (g_target-g_avg)/g_target of the green aperture; the scaling factor led_ratio_b= (b_target-b_avg)/b_target of the blue aperture;
s23: calculating the offset degree of each monochromatic aperture according to each scaling coefficient: the offset r_cal=led_ratio_r of the red aperture is 127+127; the offset g_cal=led_ratio_g of the green aperture 127+127; the offset b_cal=led_ratio_b of the blue aperture 127+127;
s24: according to the maximum scaling factor and each scaling factor, calculating the calibration limit value of each monochromatic aperture, specifically: selecting the largest scaling coefficient in the LED_Ratio_ R, LED _Ratio_G and the LED_Ratio_B to be marked as LED_Ratio_MAX; the calibration limit pwm_limit_r=255-255 for the red aperture (led_ratio_max-led_ratio_r); the calibration limit pwm_limit_g=255-255 (led_ratio_max-led_ratio_g) for the green aperture; the calibration limit pwm_limit_b=255-255 (led_ratio_max-led_ratio_b) for the blue aperture;
s25: according to each offset and each calibration limit, driving currents I/255, G_Cal and I/255, B_Cal corresponding to each offset of R/G/B can be obtained, and driving current limit values I/255, PWM_limit_ R, I/255, PWM_limit_G and I/255, PWM_limit_B corresponding to each calibration limit;
s26: and driving current corresponding to each offset degree and driving current limit value corresponding to each calibration limit value are input to a constant current dimming driving module based on PWM, and are used for calibrating the LED aperture.
2. A calibration system for an LED aperture, characterized in that it uses the calibration method for an LED aperture as claimed in claim 1 for calibrating the LED aperture.
3. A verification method of an LED aperture, wherein the LED aperture is an LED aperture calibrated by the calibration method of claim 1 or the calibration system of claim 2, the verification method comprising:
driving the LED aperture to emit a composite light source;
respectively acquiring each monochromatic aperture of the LED aperture;
dividing each single-color aperture by n equal parts, and calculating the average value of the brightness of each single-color aperture;
calculating the total brightness average value of each single-color aperture to form three total brightness average values corresponding to each single-color aperture;
and if the average value of the total brightness is smaller than or equal to the corresponding set limit value, the LED aperture calibration is qualified.
4. A verification system of an LED aperture, characterized in that it verifies the LED aperture by using the verification method of an LED aperture as claimed in claim 3.
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