CN113936579B - Method and related device for measuring flicker value of LCD display screen - Google Patents

Method and related device for measuring flicker value of LCD display screen Download PDF

Info

Publication number
CN113936579B
CN113936579B CN202111548309.0A CN202111548309A CN113936579B CN 113936579 B CN113936579 B CN 113936579B CN 202111548309 A CN202111548309 A CN 202111548309A CN 113936579 B CN113936579 B CN 113936579B
Authority
CN
China
Prior art keywords
shooting
value data
calibration
target
brightness value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111548309.0A
Other languages
Chinese (zh)
Other versions
CN113936579A (en
Inventor
张耀
曹保桂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Seichitech Technology Co ltd
Original Assignee
Shenzhen Seichitech Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Seichitech Technology Co ltd filed Critical Shenzhen Seichitech Technology Co ltd
Priority to CN202111548309.0A priority Critical patent/CN113936579B/en
Publication of CN113936579A publication Critical patent/CN113936579A/en
Application granted granted Critical
Publication of CN113936579B publication Critical patent/CN113936579B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing

Abstract

The embodiment of the application discloses a method and a related device for measuring a Flicker value of an LCD display screen, which are used for freely setting a working distance to measure a Flicker value. The method in the embodiment of the application comprises the following steps: setting working parameters and a calibration environment of a shooting camera and a spherical integral standard light source; controlling the sphere integral standard light source to output a preset brightness value set; shooting a spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shooting image set and reference brightness value data; calculating a gray level mean value of the calibration shot image set to generate calibration gray level mean value data; generating a photometric model according to the calibration gray level mean value data and the reference brightness value data; shooting a target LCD display screen to generate a target shooting image set; calculating target brightness value data according to the target shooting image set and the photometric model; and calculating the flicker value of the target LCD display screen according to the target brightness value data.

Description

Method and related device for measuring flicker value of LCD display screen
Technical Field
The embodiment of the application relates to the field of LCD display screens, in particular to a method and a related device for measuring a flicker value of an LCD display screen.
Background
Flicker is a frequency domain effect, i.e. light Flicker, which can occur on all the luminous bodies, and when the light on the luminous bodies enters a Flicker state, the Flicker can cause different damage to people and the luminous bodies.
Flicker can cause discomfort to the human eye when the light device flashes, which can reduce the life of the light device under certain Flicker conditions. Moreover, Flicker can also cause diseases in the human body, such as: neurological problems including seizures, headache, fatigue, blurred vision, asthenopia, distraction, etc. Flicker detection is generally used in the display and lighting industry, and particularly, when a thin film transistor liquid crystal display (TFT-LCD) is ac-driven at the same gray scale value, an input signal is affected by coupling capacitance, electric leakage and other factors to cause asymmetric pixel voltages of positive and negative frames, which results in inconsistent brightness of front and back frames and Flicker.
In an ideal state, the center value of the voltage Vcom of the thin film transistor liquid crystal display coincides with the center value of the voltage Vpixel, and the difference between the voltage Vpixel _ H and the voltage Vpixel _ L coincides with the difference between the voltage Vcom _ H and the voltage Vcom _ L, in which case the Flicker phenomenon does not occur. When the central value or the difference value of the two voltages deviates, Flicker phenomenon occurs. Measurement of Flicker values on thin film transistor liquid crystal displays is typically dependent on a color analyzer. However, the color analyzer is expensive, and is greatly restricted by the product model of the color analyzer in the process of detecting the Flicker value of the thin film transistor liquid crystal display, which is embodied in that the working distance between the color analyzer and the thin film transistor liquid crystal display is short, and the Flicker value can not be measured by freely setting the working distance when the color analyzer is adhered to the light emitting surface of the thin film transistor liquid crystal display for measurement.
Disclosure of Invention
The application provides a method for measuring a Flicker value of an LCD display screen in order to realize remote Flicker value detection, and the method comprises the following steps:
setting working parameters and a calibration environment of a shooting camera and a ball integral standard light source, wherein the working parameters comprise the working distance between the shooting camera and the ball integral standard light source and the exposure time, aperture and focusing distance of the shooting camera, the shooting camera consists of a high-speed industrial camera and a long-focus industrial lens, and the calibration environment is a field parameter in the shooting process;
controlling the sphere integral standard light source to output a preset brightness value set, wherein the preset brightness value set comprises at least two different brightness values;
shooting a spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to a preset brightness value set, wherein the calibration shooting image set comprises at least two calibration shooting images;
calculating a gray level mean value of the calibration shot image set to generate calibration gray level mean value data;
fitting according to the calibrated gray mean value data and the reference brightness value data to generate a photometric model, wherein the photometric model is a relational expression of the gray mean value data and the reference brightness value data;
shooting a target LCD display screen for a preset time period under working parameters and a calibration environment by a shooting camera to generate a target shooting image set, wherein the target LCD display screen is a display screen for displaying a test picture by using a point screen device;
calculating target brightness value data according to the target shooting image set and the photometric model;
and calculating the flicker value of the target LCD display screen according to the target brightness value data.
Optionally, the calculating of the gray level mean value of the calibration shot image set is performed to generate calibration gray level mean value data, including:
determining a central area of each calibration shot image in the calibration shot image set;
obtaining first gray average value data of the central area by a direct pixel averaging method, wherein the first gray average value data is a gray average value under standard brightness;
calculating second gray level average value data of the central area by a sub-area sum-and-average method, wherein the second gray level average value data is a gray level average value under a low-brightness condition;
and determining the first gray mean value data and the second gray mean value data as calibration gray mean value data.
Optionally, determining a central region of the calibration shot image includes:
and determining the central area of each calibrated shot image in the calibrated shot image set according to the field angle of the long-focus industrial lens and the chip size of the high-speed industrial camera.
Optionally, setting working parameters and calibration environment of the shooting camera and the spherical integral standard light source includes:
setting the working distance between a shooting camera and a ball integral standard light source as an actual measurement distance, wherein the actual measurement distance is the working distance when a target LCD display screen is shot;
setting an aperture of a photographing camera to a maximum aperture;
setting the diagonal distance of the shooting camera as the farthest focusing distance;
and setting the calibration environment as a darkroom environment.
Optionally, before the controlling the sphere integral standard light source to output the preset brightness value set, the measuring method further includes:
determining an output brightness range, and determining a preset brightness value set according to the output brightness range, wherein the preset brightness value set comprises at least two brightness values with uniformly increasing numerical values;
the brightness uniformity and the output brightness accuracy of the spherical integral standard light source are adjusted.
Optionally, calculating target brightness value data according to the target captured image set and the photometric model, including:
calculating a gray average value of the target shooting image set to generate target gray average value data;
and substituting the target gray level mean value data into the photometric model to calculate target brightness value data.
Optionally, calculating a flicker value of the target LCD display screen according to the target luminance value data includes:
determining a maximum brightness value, a minimum brightness value and an average brightness value in the target brightness value data;
and calculating the flicker value of the target LCD display screen according to the maximum brightness value, the minimum brightness value and the average brightness value.
This application second aspect provides a measuring device of LCD display screen scintillation value to realize long-range Flicker value and detect, this measuring device includes:
the device comprises an initialization unit, a calibration unit and a control unit, wherein the initialization unit is used for setting working parameters and a calibration environment of a shooting camera and a spherical integral standard light source, the working parameters comprise the working distance between the shooting camera and the spherical integral standard light source and the exposure time, aperture and focusing distance of the shooting camera, the shooting camera consists of a high-speed industrial camera and a long-focus industrial lens, and the calibration environment is a field parameter in the shooting process;
the output unit is used for controlling the spherical integral standard light source to output a preset brightness value set, and the preset brightness value set comprises at least two different brightness values;
the device comprises a first shooting unit, a second shooting unit and a third shooting unit, wherein the first shooting unit is used for shooting a spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to a preset brightness value set, and the calibration shooting image set comprises at least two calibration shooting images;
the first calculation unit is used for calculating the gray mean value of the calibration shooting image set to generate calibration gray mean value data;
the generating unit is used for fitting according to the calibrated gray-scale mean value data and the reference brightness value data to generate a photometric model, and the photometric model is a relational expression of the gray-scale mean value data and the reference brightness value data;
the second shooting unit is used for shooting a target LCD display screen for a preset time period under working parameters and a calibration environment through the shooting camera to generate a target shooting image set, and the target LCD display screen is a display screen for displaying a test picture by using a point screen device;
a second calculation unit configured to calculate target luminance value data from the target captured image set and the photometric model;
and the third calculating unit is used for calculating the flicker value of the target LCD display screen according to the target brightness value data.
Optionally, the first computing unit includes:
the first determining module is used for determining the central area of each calibration shot image in the calibration shot image set;
the first calculation module is used for calculating first gray average value data of the central area by a direct pixel averaging method, wherein the first gray average value data is a gray average value under standard brightness;
the second calculation module is used for calculating second gray level average value data of the central area by a sub-area sum-average method, wherein the second gray level average value data is a gray level average value under a low-brightness condition;
and the second determining module is used for determining the first gray mean value data and the second gray mean value data as calibration gray mean value data.
Optionally, the first determining module specifically includes:
and determining the central area of each calibrated shot image in the calibrated shot image set according to the field angle of the long-focus industrial lens and the chip size of the high-speed industrial camera.
Optionally, the initialization unit specifically includes:
setting the working distance between a shooting camera and a ball integral standard light source as an actual measurement distance, wherein the actual measurement distance is the working distance when a target LCD display screen is shot;
setting an aperture of a photographing camera to a maximum aperture;
setting the diagonal distance of the shooting camera as the farthest focusing distance;
and setting the calibration environment as a darkroom environment.
Optionally, the measuring device further includes:
the determining unit is used for determining an output brightness range and determining a preset brightness value set according to the output brightness range, wherein the preset brightness value set comprises at least two brightness values with uniformly increasing numerical values;
and the adjusting unit is used for adjusting the brightness uniformity and the output brightness precision of the spherical integral standard light source.
Optionally, the second calculating unit specifically includes:
calculating a gray average value of the target shooting image set to generate target gray average value data;
and substituting the target gray level mean value data into the photometric model to calculate target brightness value data.
Optionally, the third calculating unit specifically includes:
determining a maximum brightness value, a minimum brightness value and an average brightness value in the target brightness value data;
and calculating the flicker value of the target LCD display screen according to the maximum brightness value, the minimum brightness value and the average brightness value.
A third aspect of the present application provides an electronic device, comprising:
the device comprises a processor, a memory, an input and output unit and a bus;
the processor is connected with the memory, the input and output unit and the bus;
the memory holds a program that is called by the processor to perform any of the optional measurement methods as the first aspect and the first aspect.
A fourth aspect of the present application provides a computer readable storage medium having a program stored thereon, the program, when executed on a computer, performing the method of any of the optional measurements of the first aspect and the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
the method comprises the steps of obtaining a shooting camera, a spherical integral standard light source, a color analyzer and other equipment, firstly setting working parameters of the shooting camera and the spherical integral standard light source and a calibration environment, wherein the working parameters comprise the working distance between the shooting camera and the spherical integral standard light source and the exposure time, the aperture and the focusing distance of the shooting camera, the shooting camera consists of a high-speed industrial camera and a long-focus industrial lens, the calibration environment is a field parameter in the shooting process, and the setting parameters are kept consistent with the parameters of the subsequent flicker value detection of the LCD display screen. And then controlling the spherical integral standard light source to output a preset brightness value set, wherein the preset brightness value set comprises at least two different brightness values, when each brightness value is output, shooting the spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shot image set and reference brightness value data corresponding to the preset brightness value set, and the calibration shot image set comprises at least two calibration shot images. And calculating the gray level mean value of each calibration shot image in the calibration shot image set to generate calibration gray level mean value data of each calibration shot image. And fitting according to the calibration gray mean value data and the reference brightness value data to generate a photometric model, wherein the photometric model is a relational expression of the gray mean value data and the reference brightness value data. The method comprises the steps that a shooting camera shoots a target LCD display screen for a preset time period under working parameters and a calibration environment to generate a target shooting image set, wherein the target LCD display screen is a display screen for displaying a test picture by using a point screen device. Target brightness value data is calculated from the target captured image set and the photometric model. And calculating the flicker value of the target LCD display screen according to the target brightness value data. In the embodiment of the application, only need carry out photometry model's demarcation to shooting camera through the color analysis appearance, can use shooting camera to carry out grey level collection to the LCD display screen, need not to reuse the color analysis appearance, very big reduction the cost of color analysis appearance. The working distance of the shooting camera does not need to be close to the LCD display screen, and only the high-speed industrial camera and the long-focus industrial lens need to be adjusted, so that the working distance can be freely set to measure the Flicker value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic view of an embodiment of a method for measuring a flicker value of an LCD panel according to the present application;
2-1 and 2-2 are schematic diagrams of another embodiment of the method for measuring the flicker value of the LCD display screen;
FIG. 3 is a schematic view of an embodiment of a flicker measuring device for an LCD panel according to the present application;
FIG. 4 is a schematic view of another embodiment of the apparatus for measuring flicker value of LCD panel according to the present application;
fig. 5 is a schematic diagram of an embodiment of an electronic device of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In the prior art, the center value of the voltage Vcom of the thin film transistor liquid crystal display is consistent with the center value of the voltage Vpixel under an ideal state, and the difference value of the voltage Vpixel _ H and the voltage Vpixel _ L is consistent with the difference value of the voltage Vcom _ H and the voltage Vcom _ L, and the Flicker phenomenon does not occur under such a condition. When the central value or the difference value of the two voltages deviates, Flicker phenomenon occurs. Measurement of Flicker values on thin film transistor liquid crystal displays is typically dependent on a color analyzer. However, the color analyzer is expensive, and is greatly restricted by the product model of the color analyzer in the process of detecting the Flicker value of the thin film transistor liquid crystal display, which is embodied in that the working distance between the color analyzer and the thin film transistor liquid crystal display is short, and the Flicker value can not be measured by freely setting the working distance when the color analyzer is adhered to the light emitting surface of the thin film transistor liquid crystal display for measurement.
Based on this, the embodiment of the application discloses a method and a related device for measuring a Flicker value of an LCD display screen, which are used for freely setting a working distance and measuring a Flicker value.
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. 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 application.
The method of the present application may be applied to a server, a device, a terminal, or other devices with logic processing capability, and the present application is not limited thereto. For convenience of description, the following description will be given taking the execution body as an example.
Referring to fig. 1, the present application provides an embodiment of a method for measuring a flicker value of an LCD display, including:
101. setting working parameters and a calibration environment of a shooting camera and a ball integral standard light source, wherein the working parameters comprise the working distance between the shooting camera and the ball integral standard light source and the exposure time, aperture and focusing distance of the shooting camera, the shooting camera consists of a high-speed industrial camera and a long-focus industrial lens, and the calibration environment is a field parameter in the shooting process;
the shooting camera is a structure consisting of a high-speed industrial camera and a long-focus industrial lens, is mainly calibrated, can be used for shooting the LCD display screen at any working distance in an actual scene when the shooting camera finishes calibration, and measures a flicker value through a shot image.
For example: the shooting camera in the embodiment comprises an industrial camera and a 50mm industrial lens, wherein the shooting camera comprises 30 ten thousand pixels, the frame rate is larger than or equal to 500fps, the camera comprises a zero-field correction function, and the industrial camera is started in the calibration and measurement processes.
The ball integral standard light source is used for simulating an LCD display screen under the condition of different brightness, and the ball integral standard light source correspondingly emits light with uniform brightness mainly by acquiring formulated brightness signals, so that a shooting camera can return to a standard brightness image.
After the terminal acquires the shooting camera and the ball integral standard light source, the working distance, the exposure time, the aperture, the focusing distance and the calibration environment need to be debugged, wherein the debugging parameters are parameters in an actual scene, so that the measurement difference caused by the difference of the working distance, the exposure time, the aperture, the focusing distance and the calibration environment is reduced.
102. Controlling the sphere integral standard light source to output a preset brightness value set, wherein the preset brightness value set comprises at least two different brightness values;
the terminal firstly determines a preset brightness value set to be calibrated, the preset brightness value set comprises a plurality of preset brightness values, and after each preset brightness value is input into the ball integral standard light source, the ball integral standard light source can emit light with corresponding brightness.
For example: and in a brightness measurement range [0,400nit ] set by the terminal, selecting a preset brightness value every 5nit to be input into the ball integral standard light source, firstly inputting 0nit, after the shooting camera shoots a corresponding image, inputting 5nit, shooting the corresponding image by the shooting camera again, and so on until the shooting by the shooting camera is finished.
103. Shooting a spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to a preset brightness value set, wherein the calibration shooting image set comprises at least two calibration shooting images;
when the terminal controls the spherical integral standard light source to output the preset brightness value set, the shooting camera and the color analyzer need to work simultaneously, the shooting camera acquires a calibration shot image corresponding to the preset brightness value set, the color analyzer acquires reference brightness corresponding to the brightness value, and the reference brightness is determined as standard brightness. By the method, the calibration shot image shot by the shooting camera when the spherical integral standard light source outputs the brightness each time is obtained, so that the calibration shot image set is generated, and the reference brightness obtained by the color analyzer when the spherical integral standard light source outputs the brightness each time is obtained, so that the reference brightness value data is generated.
104. Calculating a gray level mean value of the calibration shot image set to generate calibration gray level mean value data;
after the terminal acquires the calibration shot image set, the gray level mean value of each calibration shot image is calculated to obtain the calibration gray level mean value of each image, and the calibration gray level mean values of each calibration shot image are set to generate calibration gray level mean value data.
105. Fitting according to the calibrated gray-scale mean value data and the reference brightness value data to generate a photometric model, wherein the photometric model is a relational expression of the gray-scale mean value data and the reference brightness value data;
the terminal fits the calibration gray level mean value and the reference brightness corresponding to each calibration shot image to generate a photometric model of a gray level value and a brightness value, wherein the photometric model is a relational expression of the gray level value and the brightness value of the shooting camera under a preset working distance, a preset aperture, a preset calibration environment and a preset diagonal distance. Through the relational expression, in practical application, the LCD display screen can be shot by only using the shooting camera, the obtained image is subjected to target gray level mean value calculation, and finally, the corresponding brightness value is obtained according to the photometric model and the target gray level mean value, so that the purposes of not depending on a color analyzer, reducing the measurement cost and freely setting the working distance for measurement are achieved.
The fitting method in this embodiment may be a first order least square fit or a second order least square fit, which is not limited herein.
The measurement model in this example is Lv = k × MLvLv is the brightness, k is the fitting coefficient, MLvThe luminance is the grayscale mean of an image captured by the Lv-phase camera.
106. Shooting a target LCD display screen for a preset time period under working parameters and a calibration environment by a shooting camera to generate a target shooting image set, wherein the target LCD display screen is a display screen for displaying a test picture by using a point screen device;
in practical application, the terminal controls the target LCD display screen to display a test picture, and then controls the shooting camera to shoot in the same working parameters and calibration environment to obtain a target shooting image. The target LCD display screen is the display screen which needs to be subjected to the flicker value test, and the target LCD display screen is used for displaying a test picture through a point screen device (PG point screen device).
107. Calculating target brightness value data according to the target shooting image set and the photometric model;
after the terminal acquires the shot image of the target LCD display screen through the shooting camera, the target brightness value data of the target LCD display screen can be directly acquired according to the target shot image set and the photometric model.
108. And calculating the flicker value of the target LCD display screen according to the target brightness value data.
After the terminal calculates the target brightness value data according to the target captured image set and the photometric model, the flicker value of the target LCD display screen can be calculated according to the target brightness value data. The calibration is performed by the color analyzer for target luminance value data, so the accuracy of the flicker value of the target LCD display screen is higher than the value calibrated without the color analyzer.
In this embodiment, first, a shooting camera, a spherical integral standard light source, a color analyzer, and other devices are obtained, a terminal first sets working parameters of the shooting camera and the spherical integral standard light source and a calibration environment, the working parameters include a working distance between the shooting camera and the spherical integral standard light source and an exposure time, an aperture, and a focusing distance of the shooting camera, the shooting camera is composed of a high-speed industrial camera and a long-focus industrial lens, the calibration environment is a field parameter in a shooting process, and the setting parameters are consistent with parameters for subsequent flicker value detection of an LCD display screen. And then the terminal controls the spherical integral standard light source to output a preset brightness value set, wherein the preset brightness value set comprises at least two different brightness values, when each brightness value is output, the terminal shoots the spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to the preset brightness value set, and the calibration shooting image set comprises at least two calibration shooting images. And the terminal calculates the gray level mean value of each calibration shot image in the calibration shot image set to generate calibration gray level mean value data of each calibration shot image. And the terminal performs fitting according to the calibrated gray-scale mean value data and the reference brightness value data to generate a photometric model, wherein the photometric model is a relational expression of the gray-scale mean value data and the reference brightness value data. The terminal shoots a target LCD display screen for a preset time period under working parameters and a calibration environment through a shooting camera to generate a target shooting image set, wherein the target LCD display screen is a display screen for displaying a test picture by using a point screen device. And the terminal calculates target brightness value data according to the target shooting image set and the photometric model. And the terminal calculates the flicker value of the target LCD display screen according to the target brightness value data. In the embodiment of the application, only need carry out photometry model's demarcation to shooting camera through the color analysis appearance, can use shooting camera to carry out grey level collection to the LCD display screen, need not to reuse the color analysis appearance, very big reduction the cost of color analysis appearance. The working distance of the shooting camera does not need to be close to the LCD display screen, and only the high-speed industrial camera and the long-focus industrial lens need to be adjusted, so that the working distance can be freely set to measure the Flicker value.
Referring to fig. 2-1 and 2-2, the present application provides another embodiment of a method for measuring flicker values of an LCD display, comprising:
201. setting the working distance between a shooting camera and a ball integral standard light source as an actual measurement distance, wherein the actual measurement distance is the working distance when a target LCD display screen is shot;
202. setting an aperture of a photographing camera to a maximum aperture;
203. setting the diagonal distance of the shooting camera as the farthest focusing distance;
204. setting the calibration environment as a darkroom environment;
the terminal sets the working distance of the shooting camera and the spherical integral standard light source as the actual measurement distance in practical application so as to reduce the inaccuracy of the measurement model caused by the change of the working distance.
And the terminal sets the aperture of the shooting camera as the maximum aperture and also sets the diagonal distance of the shooting camera as the farthest focusing distance, so that a shot image with better quality is acquired in the calibration process and the practical application.
And setting the calibration environment as a darkroom environment at the terminal, which implies that the environment is the surrounding environment except for the luminous body, and removing all light sources so as to reduce the influence of other light sources on the calibration process.
205. Determining an output brightness range, and determining a preset brightness value set according to the output brightness range, wherein the preset brightness value set comprises at least two brightness values with uniformly increasing numerical values;
206. adjusting the brightness uniformity and the output brightness precision of the ball integral standard light source;
the terminal determines an output brightness range, and determines a preset brightness value set according to the output brightness range, where the preset brightness value set includes at least two brightness values with uniformly increasing values, for example: and in a brightness measurement range [0,400nit ] set by the terminal, selecting a preset brightness value every 5nit to be input into the ball integral standard light source, firstly inputting 0nit, after the shooting camera shoots a corresponding image, inputting 5nit, shooting the corresponding image by the shooting camera again, and so on until the shooting by the shooting camera is finished.
And the terminal adjusts the brightness uniformity and output brightness accuracy of the sphere integral standard light source, such as: the uniformity of output brightness is more than 99%, and the precision of output brightness is +/-3%. Thereby reducing errors in the measurement model.
207. Controlling the sphere integral standard light source to output a preset brightness value set, wherein the preset brightness value set comprises at least two different brightness values;
208. shooting a spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to a preset brightness value set, wherein the calibration shooting image set comprises at least two calibration shooting images;
steps 207 to 208 in this embodiment are similar to steps 102 to 103 in the previous embodiment, and are not described again here.
209. Determining the central area of each calibrated shot image in the calibrated shot image set according to the field angle of the long-focus industrial lens and the chip size of the high-speed industrial camera;
the reference luminance value data acquired by the terminal is set to V,
Figure 850393DEST_PATH_IMAGE001
the unit is brightness nit, and a calibration shot image set I acquired by the terminalLvWherein
Figure 776760DEST_PATH_IMAGE002
Namely, the calibration shot image corresponds to the reference brightness one by one.
And the terminal determines the central area of each calibrated shot image in the calibrated shot image set according to the field angle of the long-focus industrial lens and the chip size of the high-speed industrial camera. The central area can be the central area with the optimal imaging effect, and the obtained data effect is better by calculating the gray average value of the central area. The determination of the center area may also be performed according to the size of the display screen, which is not limited herein.
For example: a rectangular region of a 2 ° field of view is selected as a central region in the calibration shot image.
210. Obtaining first gray average value data of the central area by a direct pixel averaging method, wherein the first gray average value data is a gray average value under standard brightness;
211. calculating second gray level average value data of the central area by a sub-area sum-and-average method, wherein the second gray level average value data is a gray level average value under a low-brightness condition;
212. determining the first gray mean value data and the second gray mean value data as calibration gray mean value data;
and the terminal uses a direct pixel averaging method and a sub-region summation averaging method to calculate the first gray average value data and the second gray average value data of the central region.
The direct pixel averaging method and the sub-area sum averaging method correspond to gray data in a normal luminance (greater than 5 times the noise level in a single photographing process) and a low luminance condition (less than 5 times the noise level in a single photographing process), respectively.
For example, a rectangular region of a 2 ° field of view is first selected as a central region in a calibration captured image. The direct pixel averaging method is to calculate first gray average value data according to the pixel number of each pixel point in a 2-degree view rectangular area in a calibration shot image. The sub-region summation and averaging method is to give a sub-region summation size (usually an integer > 1, and the optional values are 2, 3, and 4 …), perform sub-region summation in a 2 ° view rectangular region in the image data to obtain image data after resolution reduction, and then average the reduced images to obtain second gray scale average data. And integrating the first gray average value data and the second gray average value data into calibration gray average value data, namely, the gray average values correspond to the reference brightness one by one.
213. Fitting according to the calibrated gray-scale mean value data and the reference brightness value data to generate a photometric model, wherein the photometric model is a relational expression of the gray-scale mean value data and the reference brightness value data;
214. shooting a target LCD display screen for a preset time period under working parameters and a calibration environment by a shooting camera to generate a target shooting image set, wherein the target LCD display screen is a display screen for displaying a test picture by using a point screen device;
steps 213 to 214 in this embodiment are similar to steps 105 to 106 in the previous embodiment, and are not described again here.
215. Calculating a gray average value of the target shooting image set to generate target gray average value data;
216. substituting the target gray level mean value data into a photometric model to calculate target brightness value data;
217. determining a maximum brightness value, a minimum brightness value and an average brightness value in the target brightness value data;
218. and calculating the flicker value of the target LCD display screen according to the maximum brightness value, the minimum brightness value and the average brightness value.
In the actual application process, a display screen point screen PG (namely point screen equipment) is used for displaying a test picture of the Flikcer Flicker value on a target LCD display screen, and the shooting position of a lens of a shooting camera is a central area (Flicker test area) of the target LCD display screen. Setting a Flicker shooting test time T (such as 50 ms), continuously shooting by using a high-speed industrial camera in a shooting camera (the exposure time is fixed to be less than 2 ms), giving a gray average value in a rectangular region of a 2-degree field of view in image data (the average value mode used here needs to be the same as the average value calculation mode used in calibration), and using a calibrated brightness conversion model Lv = k MLvAnd converting the image gray average value into a brightness value.
Then, calculating a Flicker value according to target brightness value data obtained in the shooting test time T, wherein the calculation method comprises the following steps:
Figure 122291DEST_PATH_IMAGE003
max is the maximum brightness value in the target brightness value data obtained within the shot test time T, Min is the minimum brightness value in the target brightness value data obtained within the shot test time T, and average is the average brightness value in the target brightness value data obtained within the shot test time T.
In this embodiment, the terminal sets the working distance between the shooting camera and the ball integration standard light source as the actual measurement distance, the terminal sets the aperture of the shooting camera as the maximum aperture, the terminal sets the diagonal distance of the shooting camera as the farthest focusing distance, and the terminal sets the calibration environment as the darkroom environment. The terminal sets the working distance of the shooting camera and the spherical integral standard light source as the actual measurement distance in practical application so as to reduce the inaccuracy of the measurement model caused by the change of the working distance. And the terminal sets the aperture of the shooting camera as the maximum aperture and also sets the diagonal distance of the shooting camera as the farthest focusing distance, so that a shot image with better quality is acquired in the calibration process and the practical application. The darkroom environment is that all light sources except the luminous body are removed to reduce the influence of other light sources on the calibration process. And then, the terminal determines an output brightness range, determines a preset brightness value set according to the output brightness range, wherein the preset brightness value set comprises at least two brightness values with uniformly increasing numerical values, and adjusts the brightness uniformity and the output brightness precision of the ball integration standard light source. The terminal controls the spherical integral standard light source to output the preset brightness value set, the spherical integral standard light source is shot by the terminal through the shooting camera and the color analyzer, and a calibration shooting image set and reference brightness value data corresponding to the preset brightness value set are generated. And the terminal determines the central area of each calibrated shot image in the calibrated shot image set according to the field angle of the long-focus industrial lens and the chip size of the high-speed industrial camera. And the terminal obtains first gray mean value data of the central area by a direct pixel averaging method, wherein the first gray mean value data is a gray mean value under standard brightness. And the terminal calculates second gray average value data of the central area by a sub-area summation and averaging method, wherein the second gray average value data is a gray average value under a low-brightness condition. And the terminal determines the first gray mean value data and the second gray mean value data as calibration gray mean value data. And the terminal performs fitting according to the calibrated gray-scale mean value data and the reference brightness value data to generate a photometric model, wherein the photometric model is a relational expression of the gray-scale mean value data and the reference brightness value data. After the target LCD display screen displays the test picture by using the point screen device, the terminal shoots the target LCD display screen for a preset time period under working parameters and a calibration environment through the shooting camera to generate a target shooting image set. The terminal calculates the gray level mean value of the target shooting image set to generate target gray level mean value data, substitutes the target gray level mean value data into the photometric model to calculate target brightness value data, and determines the maximum brightness value, the minimum brightness value and the average brightness value in the target brightness value data. And finally, the terminal calculates the flicker value of the target LCD display screen according to the maximum brightness value, the minimum brightness value and the average brightness value. In the embodiment of the application, only need carry out photometry model's demarcation to shooting camera through the color analysis appearance, can use shooting camera to carry out grey level collection to the LCD display screen, need not to reuse the color analysis appearance, very big reduction the cost of color analysis appearance. The working distance of the shooting camera does not need to be close to the LCD display screen, and only the high-speed industrial camera and the long-focus industrial lens need to be adjusted, so that the working distance can be freely set to measure the Flicker value.
And secondly, creating a measuring environment which is suitable for calibration and accords with practical application by adjusting the diaphragm, the focusing distance and the exposure time in advance in a darkroom environment.
Referring to fig. 3, the present application provides an embodiment of an apparatus for measuring flicker value of an LCD panel, comprising:
the initialization unit 301 is configured to set working parameters of the shooting camera and the ball integral standard light source and a calibration environment, where the working parameters include a working distance between the shooting camera and the ball integral standard light source and an exposure time, an aperture, and a focusing distance of the shooting camera, the shooting camera is composed of a high-speed industrial camera and a long-focus industrial lens, and the calibration environment is a field parameter in a shooting process;
an output unit 302, configured to control the spherical integral standard light source to output a preset brightness value set, where the preset brightness value set includes at least two different brightness values;
a first shooting unit 303, configured to use a shooting camera and a color analyzer to shoot a spherical integral standard light source, and generate a calibration shooting image set and reference brightness value data corresponding to a preset brightness value set, where the calibration shooting image set includes at least two calibration shooting images;
a first calculating unit 304, configured to perform a gray-scale mean calculation on the calibration shot image set, and generate calibration gray-scale mean data;
a generating unit 305, configured to perform fitting according to the calibrated gray-scale mean value data and the reference luminance value data, and generate a photometric model, where the photometric model is a relational expression between the gray-scale mean value data and the reference luminance value data;
the second shooting unit 306 is configured to shoot a target LCD display screen for a preset time period under the working parameters and the calibration environment by the shooting camera to generate a target shot image set, where the target LCD display screen is a display screen on which a point-of-use screen device displays a test picture;
a second calculation unit 307 for calculating target luminance value data from the target captured image set and the photometric model;
and a third calculating unit 308 for calculating a flicker value of the target LCD display screen based on the target luminance value data.
In this embodiment, the initialization unit 301 first obtains the shooting camera, the spherical integral standard light source, the color analyzer, and other devices, and first sets the working parameters and the calibration environment of the shooting camera and the spherical integral standard light source, where the working parameters include the working distance between the shooting camera and the spherical integral standard light source and the exposure time, aperture, and focusing distance of the shooting camera, the shooting camera is composed of a high-speed industrial camera and a long-focus industrial lens, the calibration environment is a field parameter during the shooting process, and the setting parameters are all consistent with the parameters of the subsequent flicker value detection of the LCD display screen. Then, the output unit 302 controls the spherical integral standard light source to output a preset brightness value set, where the preset brightness value set includes at least two different brightness values, and when each brightness value is output, the first shooting unit 303 uses the shooting camera and the color analyzer to shoot the spherical integral standard light source, so as to generate a calibration shooting image set and reference brightness value data corresponding to the preset brightness value set, where the calibration shooting image set includes at least two calibration shooting images. The first calculation unit 304 performs calculation of a gray-scale mean value for each of the calibration captured images in the calibration captured image set, and generates calibration gray-scale mean value data for each of the calibration captured images. And the generation unit 305 performs fitting based on the calibrated gray-scale mean value data and the reference luminance value data to generate a photometric model, which is a relational expression of the gray-scale mean value data and the reference luminance value data. The second shooting unit 306 shoots a target LCD display screen for a preset time period under the working parameters and the calibration environment by the shooting camera to generate a target shooting image set, and the target LCD display screen is a display screen for displaying a test picture by using a point screen device. The second calculation unit 307 calculates target luminance value data from the target captured image set and the photometry model. The third calculation unit 308 calculates a flicker value of the target LCD display screen based on the target luminance value data. In the embodiment of the application, only need carry out photometry model's demarcation to shooting camera through the color analysis appearance, can use shooting camera to carry out grey level collection to the LCD display screen, need not to reuse the color analysis appearance, very big reduction the cost of color analysis appearance. The working distance of the shooting camera does not need to be close to the LCD display screen, and only the high-speed industrial camera and the long-focus industrial lens need to be adjusted, so that the working distance can be freely set to measure the Flicker value.
Referring to fig. 4, the present application provides another embodiment of an apparatus for measuring flicker value of an LCD panel, comprising:
the initialization unit 401 is used for setting the working distance between the shooting camera and the spherical integral standard light source, the exposure time, the aperture, the focusing distance and the calibration environment of the shooting camera, wherein the shooting camera consists of a high-speed industrial camera and a long-focus industrial lens, and the calibration environment is an environment parameter in the shooting process;
optionally, the initialization unit 401 specifically includes:
setting the working distance between a shooting camera and a ball integral standard light source as an actual measurement distance, wherein the actual measurement distance is the working distance when a target LCD display screen is shot;
setting an aperture of a photographing camera to a maximum aperture;
setting the diagonal distance of the shooting camera as the farthest focusing distance;
and setting the calibration environment as a darkroom environment.
A determining unit 402, configured to determine an output brightness range, and determine a preset brightness value set according to the output brightness range, where the preset brightness value set includes at least two brightness values that are uniformly incremented;
an adjusting unit 403 for adjusting the brightness uniformity and the output brightness accuracy of the spherical integral standard light source;
an output unit 404, configured to control the spherical integral standard light source to output a preset brightness value set, where the preset brightness value set includes at least two different brightness values;
a first shooting unit 405, configured to shoot a spherical integral standard light source by using a shooting camera and a color analyzer, and generate a calibration shooting image set and reference brightness value data corresponding to a preset brightness value set, where the calibration shooting image set includes at least two calibration shooting images;
the first calculating unit 406 is configured to calculate a gray average value of the calibration shot image set, and generate calibration gray average value data;
optionally, the first calculating unit 406 includes:
a first determining module 4061, configured to determine a central area of each calibration captured image in the calibration captured image set;
the first calculating module 4062 is configured to obtain first gray average data of the central area by a direct pixel averaging method, where the first gray average data is a gray average under standard brightness;
the second calculating module 4063 is configured to calculate second gray scale average value data of the central area by a sub-area sum-and-average method, where the second gray scale average value data is a gray scale average value under a low-brightness condition;
the second determining module 4064 is configured to determine the first gray average data and the second gray average data as calibration gray average data.
Optionally, the first determining module 4061 specifically includes:
and determining the central area of each calibrated shot image in the calibrated shot image set according to the field angle of the long-focus industrial lens and the chip size of the high-speed industrial camera.
A generating unit 407, configured to perform fitting according to the calibrated gray-scale mean data and the reference luminance value data to generate a photometric model, where the photometric model is a relational expression between the gray-scale mean data and the reference luminance value data;
the second shooting unit 408 is configured to shoot a target LCD display screen for a preset time period in the working parameter and calibration environment through the shooting camera to generate a target shot image set, where the target LCD display screen is a display screen on which a point-of-use screen device displays a test picture;
a second calculation unit 409 for calculating target luminance value data from the target captured image set and the photometric model;
optionally, the second calculating unit 409 specifically includes:
calculating a gray average value of the target shooting image set to generate target gray average value data;
and substituting the target gray level mean value data into the photometric model to calculate target brightness value data.
And a third calculating unit 410 for calculating a flicker value of the target LCD display screen based on the target luminance value data.
Optionally, the third calculating unit 410 is specifically:
determining a maximum brightness value, a minimum brightness value and an average brightness value in the target brightness value data;
and calculating the flicker value of the target LCD display screen according to the maximum brightness value, the minimum brightness value and the average brightness value.
In this embodiment, first, the initialization unit 401 sets the working distance between the shooting camera and the ball-integration standard light source as the actual measurement distance, the initialization unit 401 sets the aperture of the shooting camera as the maximum aperture, the initialization unit 401 sets the diagonal distance of the shooting camera as the farthest focusing distance, and the initialization unit 401 sets the calibration environment as the darkroom environment. The initialization unit 401 sets the working distance of the photographing camera and the sphere integral standard light source to an actual measurement distance in actual application to reduce measurement model inaccuracy due to variation in the working distance. Further, the initialization unit 401 sets the aperture of the photographing camera to the maximum aperture and also sets the diagonal distance of the photographing camera to the farthest focus distance, so that a better quality photographed image is acquired in the calibration process and in actual use. The darkroom environment is that all light sources except the luminous body are removed to reduce the influence of other light sources on the calibration process. Next, the determining unit 402 determines an output luminance range, and determines a preset luminance value set including at least two luminance values with uniformly increasing values according to the output luminance range, and the adjusting unit 403 adjusts luminance uniformity and output luminance precision of the ball-integration standard light source. The output unit 404 controls the spherical integral standard light source to output a preset brightness value set, and the first shooting unit 405 shoots the spherical integral standard light source by using a shooting camera and a color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to the preset brightness value. The first determining module 4061 of the first calculating unit 406 determines the central area of each of the calibration shot images in the calibration shot image set according to the field angle of the tele industrial lens and the chip size of the high-speed industrial camera. The first calculating module 4062 of the first calculating unit 406 calculates first gray average data of the central region by a direct pixel averaging method, wherein the first gray average data is a gray average at standard brightness. The second calculating module 4063 of the first calculating unit 406 calculates second gray level average value data of the central region by a sub-region sum-and-average method, where the second gray level average value data is a gray level average value under a low-brightness condition. The second determination module 4064 of the first calculation unit 406 determines the first and second gray level mean data as the calibration gray level mean data. The generating unit 407 performs fitting according to the calibrated gray-scale mean value data and the reference luminance value data to generate a photometric model, which is a relational expression of the gray-scale mean value data and the reference luminance value data. After the target LCD display screen displays the test image using the point screen device, the second shooting unit 408 performs shooting on the target LCD display screen for a preset time period under the working parameters and the calibration environment by the shooting camera to generate a target shooting image set, where the target LCD display screen is a display screen displaying the test image using the point screen device. The second calculation unit 409 performs calculation of a gray-scale average value for the target captured image set to generate target gray-scale average value data, the second calculation unit 409 substitutes the target gray-scale average value data into a photometric model to calculate target luminance value data, and the third calculation unit 410 determines a maximum luminance value, a minimum luminance value, and an average luminance value in the target luminance value data. Finally, the third calculation unit 410 calculates a flicker value of the target LCD display screen according to the maximum luminance value, the minimum luminance value, and the average luminance value. In the embodiment of the application, only need carry out photometry model's demarcation to shooting camera through the color analysis appearance, can use shooting camera to carry out grey level collection to the LCD display screen, need not to reuse the color analysis appearance, very big reduction the cost of color analysis appearance. The working distance of the shooting camera does not need to be close to the LCD display screen, and only the high-speed industrial camera and the long-focus industrial lens need to be adjusted, so that the working distance can be freely set to measure the Flicker value.
Referring to fig. 5, the present application provides an electronic device, including:
a processor 501, a memory 502, an input-output unit 503, and a bus 504.
The processor 501 is connected to a memory 602, an input-output unit 503, and a bus 504.
The memory 502 holds a program that the processor 501 calls to perform the measurement method as in fig. 1 to 2.
The present application provides a computer-readable storage medium having a program stored thereon, the program, when executed on a computer, performing a measurement method as in fig. 1, 2-1 and 2-2.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.

Claims (10)

1. A method for measuring flicker value of LCD display screen is characterized in that the method comprises the following steps:
setting working parameters of a shooting camera and a spherical integral standard light source and a calibration environment, wherein the working parameters comprise the working distance between the shooting camera and the spherical integral standard light source and the exposure time, aperture and focusing distance of the shooting camera, the shooting camera consists of a high-speed industrial camera and a long-focus industrial lens, and the calibration environment is a field parameter in the shooting process;
controlling the spherical integral standard light source to output a preset brightness value set, wherein the preset brightness value set comprises at least two different brightness values;
shooting the ball integral standard light source by using the shooting camera and the color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to the preset brightness value set, wherein the calibration shooting image set comprises at least two calibration shooting images;
calculating a gray level mean value of the calibration shot image set to generate calibration gray level mean value data;
fitting according to the calibrated gray-scale mean value data and the reference brightness value data to generate a photometric model, wherein the photometric model is a relational expression of the gray-scale mean value data and the reference brightness value data;
shooting a target LCD display screen for a preset time period under the working parameters and the calibration environment through the shooting camera to generate a target shooting image set, wherein the target LCD display screen is a display screen for displaying a test picture by using a point screen device;
calculating target brightness value data according to the target shooting image set and the photometric model;
and calculating the flicker value of the target LCD display screen according to the target brightness value data.
2. The measurement method according to claim 1, wherein the calculating a gray mean value of the calibration shot image set to generate calibration gray mean value data comprises:
determining a central area of each calibration shot image in the calibration shot image set;
calculating first gray mean value data of the central area by a direct pixel averaging method, wherein the first gray mean value data is a gray mean value under standard brightness;
calculating second gray level average value data of the central area by a sub-area sum-and-average method, wherein the second gray level average value data is a gray level average value under a low-brightness condition;
and determining the first gray mean value data and the second gray mean value data as calibration gray mean value data.
3. The measurement method according to claim 2, wherein the determining the central region of the calibration shot image comprises:
and determining the central area of each calibrated shot image in the calibrated shot image set according to the field angle of the long-focus industrial lens and the chip size of the high-speed industrial camera.
4. The measuring method according to claim 1, wherein the setting of the working parameters and the calibration environment of the shooting camera and the spherical integral standard light source comprises:
setting the working distance between a shooting camera and a ball integral standard light source as an actual measurement distance, wherein the actual measurement distance is the working distance when a target LCD display screen is shot;
setting an aperture of the photographing camera to a maximum aperture;
setting a diagonal distance of the photographing camera as a farthest focus distance;
setting the calibration environment as a darkroom environment.
5. The measurement method according to any one of claims 1 to 4, wherein before the controlling the sphere-integrated standard light source to output a preset set of luminance values, the measurement method further comprises:
determining an output brightness range, and determining a preset brightness value set according to the output brightness range, wherein the preset brightness value set comprises at least two brightness values with uniformly increasing numerical values;
and adjusting the brightness uniformity and the output brightness precision of the spherical integral standard light source.
6. The measurement method according to any one of claims 1 to 4, wherein the calculating target brightness value data from the target captured image set and the photometric model includes:
calculating a gray average value of the target shooting image set to generate target gray average value data;
and substituting the target gray level mean value data into the photometric model to calculate target brightness value data.
7. The measurement method according to any one of claims 1 to 4, wherein said calculating a flicker value of the target LCD display screen from the target luminance value data comprises:
determining a maximum brightness value, a minimum brightness value and an average brightness value in the target brightness value data;
and calculating the flicker value of the target LCD display screen according to the maximum brightness value, the minimum brightness value and the average brightness value.
8. A device for measuring flicker value of LCD display screen, comprising:
the device comprises an initialization unit, a calibration unit and a control unit, wherein the initialization unit is used for setting working parameters and a calibration environment of a shooting camera and a spherical integral standard light source, the working parameters comprise the working distance between the shooting camera and the spherical integral standard light source and the exposure time, aperture and focusing distance of the shooting camera, the shooting camera consists of a high-speed industrial camera and a long-focus industrial lens, and the calibration environment is a field parameter in the shooting process;
the output unit is used for controlling the spherical integral standard light source to output a preset brightness value set, and the preset brightness value set comprises at least two different brightness values;
the first shooting unit is used for shooting the ball integral standard light source by using the shooting camera and the color analyzer to generate a calibration shooting image set and reference brightness value data corresponding to the preset brightness value set, wherein the calibration shooting image set comprises at least two calibration shooting images;
the first calculation unit is used for calculating the gray mean value of the calibration shot image set to generate calibration gray mean value data;
the generating unit is used for fitting according to the calibrated gray-scale mean value data and the reference brightness value data to generate a photometric model, and the photometric model is a relational expression of the gray-scale mean value data and the reference brightness value data;
the second shooting unit is used for shooting a target LCD display screen for a preset time period under the working parameters and the calibration environment through the shooting camera to generate a target shooting image set, and the target LCD display screen is a display screen for displaying a test picture by using a point screen device;
a second calculation unit configured to calculate target luminance value data from the target captured image set and the photometric model;
and the third calculating unit is used for calculating the flicker value of the target LCD display screen according to the target brightness value data.
9. An electronic device, comprising:
the device comprises a processor, a memory, an input and output unit and a bus;
the processor is connected with the memory, the input and output unit and the bus;
the memory holds a program that the processor calls to execute the measurement method according to any one of claims 1 to 7.
10. A computer-readable storage medium having a program stored thereon, the program, when executed on a computer, performing the measurement method of any one of claims 1 to 7.
CN202111548309.0A 2021-12-17 2021-12-17 Method and related device for measuring flicker value of LCD display screen Active CN113936579B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111548309.0A CN113936579B (en) 2021-12-17 2021-12-17 Method and related device for measuring flicker value of LCD display screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111548309.0A CN113936579B (en) 2021-12-17 2021-12-17 Method and related device for measuring flicker value of LCD display screen

Publications (2)

Publication Number Publication Date
CN113936579A CN113936579A (en) 2022-01-14
CN113936579B true CN113936579B (en) 2022-03-04

Family

ID=79289303

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111548309.0A Active CN113936579B (en) 2021-12-17 2021-12-17 Method and related device for measuring flicker value of LCD display screen

Country Status (1)

Country Link
CN (1) CN113936579B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115359747B (en) * 2022-10-18 2022-12-23 无锡美科微电子技术有限公司 Screen flashing test equipment and screen flashing test method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103945089A (en) * 2014-04-18 2014-07-23 上海复控华龙微系统技术有限公司 Dynamic target detection method based on brightness flicker correction and IP camera
WO2015066946A1 (en) * 2013-11-08 2015-05-14 深圳市华星光电技术有限公司 Method and device for measuring flicker value of liquid crystal module
CN108877652A (en) * 2018-06-27 2018-11-23 武汉华星光电半导体显示技术有限公司 Optical compensation method and OLED display
CN110211523A (en) * 2019-07-26 2019-09-06 武汉精立电子技术有限公司 A kind of method, apparatus and system of telemeasurement Flicker value of liquid crystal module
CN110232885A (en) * 2019-07-26 2019-09-13 武汉精立电子技术有限公司 A kind of brightness of display screen measurement method, system and terminal
CN110428761A (en) * 2019-07-10 2019-11-08 武汉精立电子技术有限公司 A kind of method, apparatus and system of non-contact measurement Flicker value of liquid crystal module
WO2020166201A1 (en) * 2019-02-12 2020-08-20 コニカミノルタ株式会社 Flicker measuring device, flicker measuring method, and flicker measuring program

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015066946A1 (en) * 2013-11-08 2015-05-14 深圳市华星光电技术有限公司 Method and device for measuring flicker value of liquid crystal module
CN103945089A (en) * 2014-04-18 2014-07-23 上海复控华龙微系统技术有限公司 Dynamic target detection method based on brightness flicker correction and IP camera
CN108877652A (en) * 2018-06-27 2018-11-23 武汉华星光电半导体显示技术有限公司 Optical compensation method and OLED display
WO2020166201A1 (en) * 2019-02-12 2020-08-20 コニカミノルタ株式会社 Flicker measuring device, flicker measuring method, and flicker measuring program
CN113396581A (en) * 2019-02-12 2021-09-14 柯尼卡美能达株式会社 Scintillation measurement device, scintillation measurement method, and scintillation measurement program
CN110428761A (en) * 2019-07-10 2019-11-08 武汉精立电子技术有限公司 A kind of method, apparatus and system of non-contact measurement Flicker value of liquid crystal module
CN110211523A (en) * 2019-07-26 2019-09-06 武汉精立电子技术有限公司 A kind of method, apparatus and system of telemeasurement Flicker value of liquid crystal module
CN110232885A (en) * 2019-07-26 2019-09-13 武汉精立电子技术有限公司 A kind of brightness of display screen measurement method, system and terminal

Also Published As

Publication number Publication date
CN113936579A (en) 2022-01-14

Similar Documents

Publication Publication Date Title
CN108682365B (en) OLED color spot detection and repair integrated system and method
US11120757B2 (en) Gray scale adjustment method and device for display panel
CN112950657A (en) Gamma value correction method, gamma value correction device, electronic device, and readable storage medium
US10075685B1 (en) Virtual image distance test subsystem for eyecup assemblies of head mounted displays
WO2020052555A1 (en) Method for modulating brightness-grayscale curve of display device, and electronic device
CN113936579B (en) Method and related device for measuring flicker value of LCD display screen
CN111707456A (en) Optical machine definition testing method and testing device
US8090253B2 (en) Photographing control method and apparatus using strobe
CN112954304B (en) Mura defect assessment method for display panel
JP2020086409A (en) Unevenness correction data generation method and unevenness correction data generation system
CN111638042B (en) DLP optical characteristic test analysis method
US20040151486A1 (en) Camera with indication of measure of focus as a function of focal distance
CN114613315A (en) Gamma curve learning method and LED display controller
CN113936580B (en) Display screen brightness measurement model generation method and related device
CN102209202B (en) Gamma correction curve extraction method for camera
CN114359055B (en) Image splicing method and related device for multi-camera shooting screen body
CN113936621B (en) Correction method and related device for LCD display screen P-gamma
CN114427954B (en) Visibility testing device and method for near-eye display system and storage medium
CN104994309A (en) Method and system for removing light spot of camera
CN113703203B (en) Automatic testing method for display uniformity of LCD screen
CN112991233B (en) Image correction method and device
CN114112330B (en) Method and device for testing stray light
CN116642670B (en) Optical imaging method and device for micro display detection
CN109584313B (en) Camera calibration method and device, computer equipment and storage medium
CN109743569B (en) Camera focusing method and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant