CN109141822B - Screen defect detection device and method based on four-piece type color filter - Google Patents
Screen defect detection device and method based on four-piece type color filter Download PDFInfo
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- CN109141822B CN109141822B CN201810874818.4A CN201810874818A CN109141822B CN 109141822 B CN109141822 B CN 109141822B CN 201810874818 A CN201810874818 A CN 201810874818A CN 109141822 B CN109141822 B CN 109141822B
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Abstract
The application provides a screen defect detection device and method based on a four-piece color filter, wherein the device comprises: the device comprises a camera, a wave-eliminating color filter, a three-sheet type color filter wheel, a shell, a lens assembly and a data processor; the camera, the wave-absorbing color filter and the three-piece type color filter wheel are all fixedly arranged in the shell; the camera is arranged above the wave elimination color filter; the wave-eliminating color filter is arranged between the camera and the three-piece type color filter wheel; the three-piece color filter wheel comprises: a rotating shaft and a wheel disc; the rotating shaft is fixed in the shell, and the wheel disc is rotationally fixed on the rotating shaft; the wheel disc is provided with an X color filter, a Y color filter and a Z color filter; the lens assembly includes: a connecting ring and a lens; the connecting ring is fixedly arranged in the shell and is close to the three-sheet type filter color wheel; the lens is fixedly connected with the connecting ring and extends out of the shell; the data processor is connected with the camera.
Description
Technical Field
The application relates to the technical field of screen defect detection, in particular to a screen defect detection device and method based on four-piece color filters.
Background
At present, more and more Liquid Crystal Displays (LCD) are replaced by organic light-Emitting diodes (OLED) displays, and compared with LCD displays, OLED displays have the characteristics of high screen brightness, high contrast response, high color rendering index, flexibility, and capability of being curled. But the OLED has the defect of multiple mura (spots), so that the yield of the OLED is greatly reduced, and the use and popularization of the OLED are limited. Therefore, it is of great significance to accurately detect mura defects in a screen and correct the mura defects in time by an electrical or optical method.
Mura defects are caused by non-uniform brightness of display screenThe phenomenon of trace, therefore, to accurately find the mura defect, needs to be started from the brightness and chromaticity of each block of the screen. Generally, luminance information of a screen is detected and only detected using a luminance meter, and chromaticity and luminance information of the screen are detected using a colorimeter. The traditional colorimeter mainly comprises a camera, a color filter wheel, a connecting ring and a lens, wherein the color filter wheel generally comprises three color filters, and the parameters of the traditional color filters are respectively
Wherein the content of the first and second substances,
for the spectral tristimulus values of a standard observer chosen according to the rules,
the spectral response curve of the camera used shows that the measurement results of the conventional colorimeter are inseparable from the parameters of the camera used. In the process of obtaining the chromaticity information, the color filter wheel needs to be rotated, and the screen to be tested is made to respectively image through three color filters on the color filter wheel, so that the tristimulus values are measured and calculated, and the defect area is finally determined.
However, the inventor has some problems when using the traditional colorimeter and the luminance meter to detect the screen defects, and when detecting the screen defects, because the parameters of the color filters are related to the spectral response curves of the used cameras, each color filter only uniquely corresponds to one camera, if the camera is replaced, the color filter wheel needs to be replaced correspondingly, which undoubtedly greatly increases the production cost; in the process of measurement and calculation, the spectral response curve of a camera and camera parameters are related, because the measurement result of each parameter has errors outside, the detection error of the defects is undoubtedly enlarged, and even if some colorimeter manufacturers improve the film coating precision of the color filter in order to improve the chroma measurement precision, the color filter is used for measuring the color filter
Boundary division into
And
the two color filters change the original three-piece type color filtering wheel into a four-piece type color filtering wheel, and the color filtering wheel still needs to be in one-to-one correspondence with the camera and cannot be randomly replaced.
Disclosure of Invention
The application provides a screen defect detection device and method based on four-piece type color filters, and aims to solve the problem that an existing screen defect detection device is high in production cost.
The application provides a screen defect detection device based on four-piece color filter in a first aspect, which is characterized by comprising: the device comprises a camera, a wave-eliminating color filter, a three-sheet type color filter wheel, a shell, a lens assembly and a data processor;
the camera, the wave-absorbing color filter and the three-piece type color filter wheel are all fixedly arranged in the shell, and the shell is used for protecting internal components;
the working interfaces of the camera, the wave-eliminating color filter, the three-piece type color filter wheel and the lens component are all arranged in parallel;
the camera is arranged above the wave elimination color filter and used for acquiring a screen image;
the wave-absorbing color filter is arranged between the camera and the three-piece type color filtering wheel and is used for being matched with the three-piece type color filtering wheel to generate a superimposed color filtering effect;
the three-piece color filter wheel comprises: a rotating shaft and a wheel disc;
the rotating shaft is fixed in the shell, and the wheel disc is rotationally fixed on the rotating shaft;
the wheel disc is provided with an X color filter, a Y color filter and a Z color filter,
wherein, during the rotation of the wheel disc, at least 1 color filter corresponds to the wave elimination color filter;
the lens assembly includes: a connecting ring and a lens;
the connecting ring is fixedly arranged in the shell and is close to the three-sheet type filter color wheel;
the lens is fixedly connected with the connecting ring and extends out of the shell;
the data processor is connected with the camera and used for processing the image data transmitted by the camera.
Optionally, the camera is attached to the evanescent color filter;
the distance between the three-piece type filter color wheel and the wave elimination color filter is 1-2 mm.
Optionally, the axis of the evanescent filter, the axis of the X-filter or the Y-filter or the Z-filter coincides with the axis of the lens assembly.
The second aspect of the present application provides a screen defect detecting apparatus based on four-piece color filter, wherein the detecting apparatus comprises: the device comprises a camera, a wave-eliminating color filter, a three-sheet type color filter wheel, a lens assembly and a data processor;
the working interfaces of the camera, the wave-eliminating color filter, the three-piece type color filter wheel and the lens component are all arranged in parallel;
the camera is arranged above the lens assembly and used for acquiring a screen image;
the lens assembly includes: a connecting ring and a lens;
the connecting ring is rotationally connected with the lens and is close to the three-sheet type filter color wheel;
the wave-absorbing color filter is arranged below the lens component and is used for being matched with the three-piece type color filter wheel to generate a superimposed color filtering effect;
the three-piece type filter color wheel is arranged below the wave elimination color filter;
the three-piece color filter wheel comprises: a rotating shaft and a wheel disc;
the wheel disc is rotationally fixed on the rotating shaft;
the wheel disc is provided with an X color filter, a Y color filter and a Z color filter,
wherein, during the rotation of the wheel disc, at least 1 color filter corresponds to the wave elimination color filter;
the data processor is connected with the camera and used for processing the image data transmitted by the camera.
The third aspect of the present application provides a screen defect detection method based on a four-piece color filter, which is characterized in that the method comprises:
determining parameters of the three-piece type filter wheel according to a preset rule, and determining parameters of the wave-absorbing filter according to spectral response curve parameters of the camera;
acquiring a superposed image of a screen to be tested after superposition of the parameters of the three-piece type filter wheel and the parameters of the wave-eliminating color filter;
calculating a tristimulus value according to the superposed image;
calculating chromaticity coordinate values according to the tristimulus values;
dividing image areas corresponding to adjacent chromaticity coordinate values in the same coordinate value range into areas with the same value;
and traversing each homonymous region, and determining the homonymous region with the chromaticity coordinate value fluctuation exceeding a preset fluctuation range as a defect region.
Optionally, the specific step of dividing the image areas corresponding to the adjacent chromaticity coordinate values in the same coordinate value range into areas with the same value is:
traversing each chromaticity coordinate value, and calculating the chromaticity difference value of two adjacent chromaticity coordinate values;
determining that the two chromaticity coordinate values corresponding to the chromaticity difference value with the absolute value smaller than or equal to a preset difference value are suspected identical values;
arranging the suspected identity values in a descending order;
and dividing each suspected identity value into an identity value area according to a rule that the absolute value of the difference value between the maximum suspected identity value and the minimum suspected identity value in the same group of the suspected identity values is less than or equal to a preset identity value difference range.
Optionally, the specific step of traversing each homonymous region and determining that the homonymous region where the chromaticity coordinate value fluctuation exceeds a preset fluctuation range is a defect region is as follows:
calculating chromaticity difference values of the homometric regions and preset screen chromaticity coordinate values;
if the chromaticity difference value is larger than or equal to a preset fluctuation range, the same-value area corresponding to the chromaticity difference value is a defect area;
and if the chromaticity difference value is smaller than a preset fluctuation range, the same-value area corresponding to the chromaticity difference value is a normal area.
Optionally, the method further comprises:
the screen to be tested adopts a single-color lighting picture.
Optionally, the step of calculating a tristimulus value according to the superimposed image further includes:
the tristimulus values respectively correspond to the stimulus values measured by superposing the X color filter, the Y color filter, the Z color filter and the evanescent wave color filter;
determining the stimulus value measured by superposing the Y color filter and the clip color filter as a brightness related value;
and acquiring the brightness information of the screen to be detected according to the brightness correlation value.
Optionally, the method further comprises:
acquiring the size to be measured of the screen to be measured;
and adjusting parameters of the detection device according to the size to be detected, wherein the parameters at least comprise the length of the connecting ring, the parameters of the lens and the height of the camera.
As can be seen from the above technologies, the present application provides a four-piece color filter-based screen defect detection apparatus and method, wherein the apparatus includes: the device comprises a camera, a wave-eliminating color filter, a three-sheet type color filter wheel, a shell, a lens assembly and a data processor; the camera, the wave-absorbing color filter and the three-piece type color filter wheel are all fixedly arranged in the shell, and the shell is used for protecting internal components; the working interfaces of the camera, the wave-eliminating color filter, the three-piece type color filter wheel and the lens component are all arranged in parallel; the camera is arranged above the wave elimination color filter and used for acquiring a screen image; the wave-absorbing color filter is arranged between the camera and the three-piece type color filtering wheel and is used for being matched with the three-piece type color filtering wheel to generate a superimposed color filtering effect; the three-piece color filter wheel comprises: a rotating shaft and a wheel disc; the rotating shaft is fixed in the shell, and the wheel disc is rotationally fixed on the rotating shaft; the rotary disc is provided with an X color filter, a Y color filter and a Z color filter, wherein at least 1 color filter corresponds to the wave-absorbing color filter in the rotating process of the rotary disc; the lens assembly includes: a connecting ring and a lens; the connecting ring is fixedly arranged in the shell and is close to the three-sheet type filter color wheel; the lens is fixedly connected with the connecting ring and extends out of the shell; the data processor is connected with the camera and used for processing the image data transmitted by the camera. Or, the camera, the wave-eliminating color filter, the three-piece type color filter wheel, the lens component and the data processor; the working interfaces of the camera, the wave-eliminating color filter, the three-piece type color filter wheel and the lens component are all arranged in parallel; the camera is arranged above the lens assembly and used for acquiring a screen image; the lens assembly includes: a connecting ring and a lens; the connecting ring is rotationally connected with the lens and is close to the three-sheet type filter color wheel; the wave-absorbing color filter is arranged below the lens component and is used for being matched with the three-piece type color filter wheel to generate a superimposed color filtering effect; the three-piece type filter color wheel is arranged below the wave elimination color filter; the three-piece color filter wheel comprises: a rotating shaft and a wheel disc; the wheel disc is rotationally fixed on the rotating shaft; the rotary disc is provided with an X color filter, a Y color filter and a Z color filter, wherein at least 1 color filter corresponds to the wave-absorbing color filter in the rotating process of the rotary disc; the data processor is connected with the camera and used for processing the image data transmitted by the camera. When the device is used, the screen to be measured is placed at a proper position below the lens component, the parameters of the adapter ring and the lens are adjusted, and the screen is lightened. The working interfaces of any color filter of the camera, the wave-absorbing color filter and the three-piece type color filter wheel and the lens component are mutually overlapped and are all overlapped with the screen to be tested, so that the camera can shoot the screen image of the screen to be tested after the overlapping effect of the wave-absorbing color filter and the three-piece type color filter wheel. And rotating the three-piece type filter color wheel to enable the wave-eliminating color filter and each color filter to sequentially form different superposition effects, so that the camera sequentially obtains three screen images. The camera transmits the information of the three screen images to the data processor, the data processor analyzes and calculates the tristimulus values according to the screen images so as to obtain chromaticity coordinate values, and the defect area is determined by comparing the chromaticity coordinate values. The screen defect detection device and method based on the four-piece type color filter can ensure that the color filter on the three-piece type color filter wheel is not influenced by different camera models, is suitable for various cameras, only the wave-absorbing color filter is uniquely matched with the camera, and only the wave-absorbing color filter needs to be replaced, so that the cost is reduced, and the operation steps are greatly reduced.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a four-sheet color filter-based screen defect detection apparatus provided in the present application;
fig. 2 is a schematic structural diagram of a three-blade color filter wheel provided in the present application;
FIG. 3 is a schematic structural diagram of another four-color filter-based screen defect detecting apparatus provided in the present application;
FIG. 4 is a flowchart of a four-color filter-based screen defect detection method provided in the present application;
FIG. 5 is a flowchart of a method for partitioning regions of the same value provided herein;
fig. 6 is a flowchart of a method for determining a defective area according to the present application.
Illustration of the drawings:
the device comprises a camera 1, a wave-absorbing filter 2, a three-piece type filter color wheel 3, a rotating shaft 31, a wheel 32, a filter 321-X, a filter 322-Y, a filter 323-Z, a shell 4, a lens assembly 5, a connecting ring 51, a lens 52 and a data processor 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, a four-sheet type color filter based screen defect detecting apparatus; fig. 2 is a schematic structural diagram of a three-plate color filter wheel.
The embodiment provides a screen defect detection device based on four-piece color filter, which is characterized in that the detection device comprises: the device comprises a camera 1, a wave-eliminating color filter 2, a three-piece type color filter wheel 3, a shell 4, a lens assembly 5 and a data processor 6;
the camera 1, the wave elimination color filter 2 and the three-piece type color filter wheel 3 are all fixedly arranged in the shell 4, and the shell 4 is used for protecting internal components;
the working interfaces of the camera 1, the wave elimination color filter 2, the three-piece type filter color wheel 3 and the lens component 5 are all arranged in parallel;
the camera 1 is arranged above the wave elimination color filter 2 and is used for acquiring a screen image;
the wave-absorbing color filter 2 is arranged between the camera 1 and the three-piece type filter color wheel 3 and is used for being matched with the three-piece type filter color wheel 3 to generate a superimposed color filtering effect;
the three-plate color filter wheel 3 includes: a rotary shaft 31 and a disk 32;
the rotating shaft 31 is fixed in the shell 4, and the wheel disc 32 is rotationally fixed on the rotating shaft 31;
the roulette plate 32 is provided with an X filter 321, a Y filter 322 and a Z filter 323,
wherein, during the rotation of the wheel disc 32, at least 1 color filter corresponds to the wave elimination color filter 2;
the lens assembly 5 includes: a joint ring 51 and a lens 52;
the connecting ring 51 is fixedly arranged in the shell 4 and is close to the three-piece filter color wheel 3;
the lens 52 is fixedly connected with the connecting ring 51 and extends out of the shell 4;
the data processor 6 is connected to the camera 1 and is configured to process image data transmitted by the camera 1.
When the device is used, the screen to be tested is placed at a proper position below the lens assembly 5, parameters of the adapter ring 51 and the lens 52 are adjusted, and the screen is lightened. The working interfaces of any one of the camera 1, the wave-elimination color filter 2 and the three-piece type filter color wheel 3 and the lens component 5 are mutually overlapped and are all overlapped with the screen to be tested, so that the camera 1 can shoot the screen image of the screen to be tested after the overlapping effect of the wave-elimination color filter 2 and the three-piece type filter color wheel 3. The three-piece type filtering color wheel 3 is rotated to enable the wave-eliminating color filter 2 and each color filter to sequentially form different superposition effects, so that the camera 1 sequentially obtains three screen images. The camera 1 transmits information of the three screen images to the data processor 6, the data processor 6 analyzes and calculates tristimulus values according to the screen images, further obtains chromaticity coordinate values, and determines a defect area by comparing the chromaticity coordinate values. The screen defect detection device and method based on the four-piece type color filter can ensure that the color filter on the three-piece type color filter wheel is not influenced by different camera models, is suitable for various cameras, only the wave-absorbing color filter is uniquely matched with the camera, and only the wave-absorbing color filter needs to be replaced, so that the cost is reduced, and the operation steps are greatly reduced.
The data processor 6 comprises the following specific working steps:
referring to fig. 4, a flow chart of a screen defect detection method based on four-piece color filters.
S100, determining parameters of the three-piece type filter wheel according to a preset rule, and determining parameters of a wave-absorbing color filter according to spectral response curve parameters of a camera;
the preset rule selected in the embodiment of the application is the rule of 1931CIE standard chromaticity system, and the corresponding three color filter parameters can be uniquely determined according to the rule and are respectively defined as
As can be seen, the color filters in the three-piece color filter wheel 3 are all uniquely determined by preset rules, and are independent of external factors, such as the model of the camera. The preset rule can be specifically selected according to the screen to be measured actually. The wave-eliminating color filter 2 designed in the embodiment of the application adopts a single structure, and the parameters of the wave-eliminating color filter are determined by the spectral response curve p (lambda) of the camera and defined as
Therefore, in practical applications, only the chopping filter 2 needs to be replaced according to the specific camera model used.
S200, acquiring a superposed image of a screen to be tested after superposition of the parameters of the three-piece type filter wheel and the parameters of the wave-eliminating color filter;
since the camera 1 inevitably has interference of the spectral response curve to the imaging, it is necessary to eliminate the interference, and the main function of the wave-elimination filter 2 designed in the embodiment of the present application is to cancel the spectral response curve of the camera 1 itself. Therefore, it is necessary to ensure that the image shot by the camera 1 is a screen image processed by the superposition effect of the wave-eliminating filter 2 and any one of the three-piece filter wheel.
S300, calculating a tristimulus value according to the superposed image;
the camera 1 transmits the shot superposed image information to the data processor 6, and the data processor 6 extracts the relevant parameter information according to the superposed image information and obtains the tristimulus values according to the internal operation of the obtained relevant parameter information. The tristimulus value is calculated by using the color stimulus function
The parameters of the three color filters, as determined by CIE, are multiplied and integrated over the entire visible spectrum. The standard equation calculation of the tristimulus values is carried out according to the formulas (1), (2) and (3):
wherein X, Y, Z represents the tristimulus values,
representing the color stimulus function, k representing the adjustment factor,
representing the parameters of the three filters, respectively, and d λ represents the wavelength interval.
In actual calculations, the integral can be approximated by a summation, which is calculated according to equations (4), (5), (6):
where Δ λ and d λ have the same meaning. The wavelength interval is usually 5nm or 10 nm;
light energy that produces a color perception for entering the human eye,if the object to be measured is self-luminous,
a relative spectral power density distribution S (λ) for the radiation of the luminophore, and
the adjustment factor k is obtained by substituting the following equation (6) when the illuminant or the Y value obtained by equation (5) is adjusted to 100:
in particular, in practical applications, there are more interference factors, and therefore, the k value is usually determined by comparing with the reference value. For example: the colorimetric value of a standard sample is measured in advance and determined as a reference value, the colorimetric value of the same standard sample is measured by using the detection device provided by the application as an actual value, and the k value is calculated by comparing the reference value with the actual value.
The detection device provided by the application can add a correction color filter, namely a wave-absorbing color filter 2, to an illumination light source, namely a lighted screen to be detected, so that the detection value obtained by the camera 1 is consistent with the spectral tristimulus value of a CIE standard chromaticity observer. Therefore, when a sample is tested, the output of the instrument can be in direct proportion to the CIE tristimulus value, and the tristimulus value can be directly measured, so that the interference of spectral responsivity is avoided.
S400, calculating chromaticity coordinate values according to the tristimulus values;
the chromaticity information of the object can be represented by chromaticity coordinate values, a uniform chromaticity scale diagram is formulated in CIE1960 according to the research of macadam, the uniform chromaticity scale diagram becomes a CIE1960 UCS uniform chromaticity diagram, which is called CIE1960 UCS diagram for short, u and v values are used as chromaticity coordinates of a new chromaticity diagram, and the chromaticity information can be obtained according to the formulas (8) and (9):
wherein u and v represent chromaticity coordinate values, and X, Y, Z represents tristimulus values.
S500, dividing image areas corresponding to adjacent chromaticity coordinate values in the same coordinate value range into areas with the same value;
in order to determine the defect area, the whole screen image is firstly divided into areas with the same value and different chromaticity coordinate values in the same range, and a comparison basis is provided for subsequent comparison.
In particular, referring to fig. 5, a flow chart of a method of partitioning regions of the same value.
S501, traversing each chromaticity coordinate value, and calculating chromaticity difference values of two adjacent chromaticity coordinate values;
s502, determining that two chromaticity coordinate values corresponding to the chromaticity difference values, the absolute values of which are less than or equal to a preset difference value, are suspected identical values;
s503, arranging the suspected identical values in descending order;
and S504, dividing the suspected identical values into identical value areas according to a rule that the absolute value of the difference value between the maximum suspected identical value and the minimum suspected identical value in the same group of the suspected identical values is smaller than or equal to a preset identical value difference range.
And comparing all chromaticity coordinate values to find the chromaticity coordinate value which initially accords with the preset difference value, and defining the chromaticity coordinate value as a suspected identity value. In order to prevent the difference value between the coordinate values of the non-adjacent chromaticity, the suspected same values need to be compared again, and the difference value between the maximum suspected same value and the minimum suspected same value in the divided coordinate values of the chromaticity in the same group does not exceed the preset same value difference range, so that the same value area is accurately divided.
S600, traversing each homonymous region, and determining the homonymous region with the chromaticity coordinate value fluctuation exceeding a preset fluctuation range as a defect region.
Referring specifically to fig. 6, a flow chart of a method of determining a defective area.
S601, calculating chromaticity difference values of the homonymous regions and preset screen chromaticity coordinate values;
s602, if the chromaticity difference value is larger than or equal to a preset fluctuation range, the same-value area corresponding to the chromaticity difference value is a defect area;
s603, if the chromaticity difference value is smaller than a preset fluctuation range, the same-value area corresponding to the chromaticity difference value is a normal area.
The coordinate value of the chromaticity coordinate value on the screen image which is larger than the preset chromaticity coordinate value can be set as the preset chromaticity coordinate value, and the preset chromaticity coordinate value can also be set according to historical record data, product parameters and the like. And continuously comparing the difference value between each homonymous region and the preset chromaticity coordinate value to accurately find the region with the maximum fluctuation and defining the region as a defect region.
Optionally, the method further comprises:
the screen to be tested adopts a single-color lighting picture.
The screen to be detected can select a multicolor or monochrome lighting mode, but in the process of actually determining the defect area, the pictures with different colors can generate the change of the number of color blocks, so that the defect area is difficult to be accurately determined by using a uniform reference standard, and the difficulty is increased for subsequently describing the defect boundary. Therefore, a monochrome lighting picture is preferred, for example: red, blue or green pictures.
Optionally, the step of calculating a tristimulus value according to the superimposed image further includes:
the tristimulus values respectively correspond to the stimulus values measured by superposing the X color filter, the Y color filter, the Z color filter and the evanescent wave color filter;
determining the stimulus value measured by superposing the Y color filter and the clip color filter as a brightness related value;
and acquiring the brightness information of the screen to be detected according to the brightness correlation value.
The screen defect detection device of the four-piece color filter can measure two parameters of brightness and chromaticity at one time, wherein the brightness related value can be determined according to the stimulus value measured by the Y color filter, so that the number of measuring instruments can be reduced, the detection steps are simplified, and the detection efficiency is improved.
Optionally, the method further comprises:
acquiring the size to be measured of the screen to be measured;
and adjusting parameters of the detection device according to the size to be detected, wherein the parameters at least comprise the length of the connecting ring, the parameters of the lens and the height of the camera.
Because the size of the screen that awaits measuring is not of uniform size, in order to save detection device's quantity, reduce the detection cost, need be according to concrete screen size that awaits measuring, the corresponding parameter of each part of adjustment detection device.
Optionally, the camera (1) is attached to the wave elimination filter (2);
the distance between the three-piece type filtering color wheel (3) and the wave-eliminating color filter (2) is 1-2 mm.
In order to reduce the influence of light energy attenuation caused by the space and the gap between the components of the detection device on the detection result, avoid the problems of interference objects entering between the components and the like, and avoid the problem that the overall detection device is too large in size and not easy to place due to the overlarge space between the components; and simultaneously avoid the interval undersize between the part, increase the degree of difficulty of assembly, adjustment, especially three-piece type filter wheel 3 need constantly rotate, need bigger activity space, must strictly control the interval between each part of detection device.
Optionally, the axis of the evanescent filter 2, the axis of the X filter 321 or the Y filter 322 or the Z filter 323 coincide with the axis of the lens assembly 5.
The wave-absorbing color filter 2 and each color filter of the three-piece color filter wheel 3 are coated with films, the parameters of the coating curve of the color filter are related to the angle of incident light, and the included angle formed by the light ray of the screen to be measured and the straight line vertical to the color filter is defined as the incident angle. The blue shift of the spectrum is caused by the large angle of the incident angle, so that before the film coating of the color filter, in order to improve the accuracy of the spectrum of the color filter, the incident angle and the cone angle need to be infinitely close to 0 degree, namely, the axes of all the components are coincided.
Referring to fig. 3, a schematic structural diagram of another four-color filter-based screen defect detecting apparatus is shown.
The embodiment of the application also provides another screen defect detection device based on four-piece type color filter, which is characterized in that the detection device comprises: the device comprises a camera 1, a wave-eliminating color filter 2, a three-piece type color filter wheel 3, a lens component 5 and a data processor 6;
the working interfaces of the camera 1, the wave elimination color filter 2, the three-piece type filter color wheel 3 and the lens component 5 are all arranged in parallel;
the camera 1 is arranged above the lens assembly 5 and used for acquiring a screen image;
the lens assembly 5 includes: a joint ring 51 and a lens 52;
the connecting ring 51 is rotatably connected with the lens 52 and is close to the three-piece color filter wheel 3;
the wave-absorbing color filter 2 is arranged below the lens component 5 and is used for being matched with the three-piece type color filter wheel 3 to generate a superimposed color filtering effect;
the three-piece type filter color wheel 3 is arranged below the wave elimination color filter 2;
the three-plate color filter wheel 3 includes: a rotary shaft 31 and a disk 32;
the wheel disc 32 is rotationally fixed on the rotating shaft 31;
the roulette plate 32 is provided with an X filter 321, a Y filter 322 and a Z filter 323,
wherein, during the rotation of the wheel disc 32, at least 1 color filter corresponds to the wave elimination color filter 2;
the data processor 6 is connected to the camera 1 and is configured to process image data transmitted by the camera 1.
The difference between the device structure provided in this embodiment and the device structure provided in the previous embodiment is the positions of the achromatic filter 2 and the three-piece color filter wheel 3, and the main functions of the achromatic filter 2 and the three-piece color filter wheel 3 are to generate the superimposed color filtering effect in a matching manner, so that the achromatic filter 2 and the three-piece color filter wheel 3 only need to be simultaneously arranged between the camera 1 and the screen to be tested.
The operation method and other optimization schemes of the detection device provided by the embodiment can refer to the operation method and the optimization scheme of the detection device provided by the previous embodiment.
As can be seen from the above technical solutions, an embodiment of the present application provides a screen defect detecting apparatus based on a four-piece color filter, where the detecting apparatus includes: the device comprises a camera 1, a wave-eliminating color filter 2, a three-piece type color filter wheel 3, a shell 4, a lens assembly 5 and a data processor 6; the camera 1, the wave elimination color filter 2 and the three-piece type color filter wheel 3 are all fixedly arranged in the shell 4, and the shell 4 is used for protecting internal components; the working interfaces of the camera 1, the wave elimination color filter 2, the three-piece type filter color wheel 3 and the lens component 5 are all arranged in parallel; the camera 1 is arranged above the wave elimination color filter 2 and is used for acquiring a screen image; the wave-absorbing color filter 2 is arranged between the camera 1 and the three-piece type filter color wheel 3 and is used for being matched with the three-piece type filter color wheel 3 to generate a superimposed color filtering effect; the three-plate color filter wheel 3 includes: a rotary shaft 31 and a disk 32; the rotating shaft 31 is fixed in the shell 4, and the wheel disc 32 is rotationally fixed on the rotating shaft 31; an X color filter 321, a Y color filter 322 and a Z color filter 323 are arranged on the wheel disc 32, wherein at least 1 color filter corresponds to the wave absorbing color filter 2 in the rotating process of the wheel disc 32; the lens assembly 5 includes: a joint ring 51 and a lens 52; the connecting ring 51 is fixedly arranged in the shell 4 and is close to the three-piece filter color wheel 3; the lens 52 is fixedly connected with the connecting ring 51 and extends out of the shell 4; the data processor 6 is connected to the camera 1 and is configured to process image data transmitted by the camera 1. Or, the camera 1, the wave-eliminating color filter 2, the three-piece color filter wheel 3, the lens assembly 5 and the data processor 6; the working interfaces of the camera 1, the wave elimination color filter 2, the three-piece type filter color wheel 3 and the lens component 5 are all arranged in parallel; the camera 1 is arranged above the lens assembly 5 and used for acquiring a screen image; the lens assembly 5 includes: a joint ring 51 and a lens 52; the connecting ring 51 is rotatably connected with the lens 52 and is close to the three-piece color filter wheel 3; the wave-absorbing color filter 2 is arranged below the lens component 5 and is used for being matched with the three-piece type color filter wheel 3 to generate a superimposed color filtering effect; the three-piece type filter color wheel 3 is arranged below the wave elimination color filter 2; the three-plate color filter wheel 3 includes: a rotary shaft 31 and a disk 32; the wheel disc 32 is rotationally fixed on the rotating shaft 31; an X color filter 321, a Y color filter 322 and a Z color filter 323 are arranged on the wheel disc 32, wherein at least 1 color filter corresponds to the wave absorbing color filter 2 in the rotating process of the wheel disc 32; the data processor 6 is connected to the camera 1 and is configured to process image data transmitted by the camera 1.
When the device is used, the screen to be tested is placed at a proper position below the lens assembly 5, parameters of the adapter ring 51 and the lens 52 are adjusted, and the screen is lightened. The working interfaces of any one of the camera 1, the wave-elimination color filter 2 and the three-piece type filter color wheel 3 and the lens component 5 are mutually overlapped and are all overlapped with the screen to be tested, so that the camera 1 can shoot the screen image of the screen to be tested after the overlapping effect of the wave-elimination color filter 2 and the three-piece type filter color wheel 3. The three-piece type filtering color wheel 3 is rotated to enable the wave-eliminating color filter 2 and each color filter to sequentially form different superposition effects, so that the camera 1 sequentially obtains three screen images. The camera 1 transmits information of the three screen images to the data processor 6, the data processor 6 analyzes and calculates tristimulus values according to the screen images, further obtains chromaticity coordinate values, and determines a defect area by comparing the chromaticity coordinate values. The screen defect detection device and method based on the four-piece type color filter can ensure that the color filter on the three-piece type color filter wheel is not influenced by different camera models, is suitable for various cameras, only the wave-absorbing color filter is uniquely matched with the camera, and only the wave-absorbing color filter needs to be replaced, so that the cost is reduced, and the operation steps are greatly reduced. In addition, the variable can be controlled to be only one parameter of the wave elimination color filter, and the measurement precision can be improved by reducing the variable.
It should be noted that, in specific implementations, the present invention also provides a computer storage medium, where the computer storage medium may store a program, and when the program is executed, the program may include some or all of the steps in each embodiment of the user identity service providing method or the user registration method provided by the present invention. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A four-sheet color filter-based screen defect detecting apparatus, comprising: the device comprises a camera (1), a wave-absorbing color filter (2), a three-piece type color filter wheel (3), a shell (4), a lens assembly (5) and a data processor (6);
the camera (1), the wave-absorbing color filter (2) and the three-piece color filter wheel (3) are all fixedly arranged in the shell (4), and the shell (4) is used for protecting internal components;
the working interfaces of the camera (1), the wave elimination color filter (2), the three-piece type color filter wheel (3) and the lens component (5) are all arranged in parallel;
the camera (1) is arranged above the wave elimination color filter (2) and is used for acquiring a screen image;
the wave-absorbing color filter (2) is arranged between the camera (1) and the three-piece type filter color wheel (3) and is used for being matched with the three-piece type filter color wheel (3) to generate a superimposed color filtering effect;
the three-plate color filter wheel (3) comprises: a rotating shaft (31) and a wheel disc (32);
the rotating shaft (31) is fixed in the shell (4), and the wheel disc (32) is rotationally fixed on the rotating shaft (31);
an X color filter (321), a Y color filter (322) and a Z color filter (323) are arranged on the wheel disc (32),
wherein, during the rotation of the wheel disc (32), at least 1 color filter corresponds to the wave elimination color filter (2);
the lens assembly (5) comprises: a lens (52) and a mount (51);
the connecting ring (51) is fixedly arranged in the shell (4) and is close to the three-piece type filter color wheel (3);
the lens (52) is fixedly connected with the connecting ring (51) and extends out of the shell (4);
the data processor (6) is connected with the camera (1) and is used for processing the image data transmitted by the camera (1).
2. The detection device according to claim 1, wherein the camera (1) is attached to the achromatic filter (2);
the distance between the three-piece type filtering color wheel (3) and the wave-eliminating color filter (2) is 1-2 mm.
3. The detection device according to claim 1, wherein the axis of the achromatic filter (2), the axis of the X-filter (321) or the Y-filter (322) or the Z-filter (323) coincides with the axis of the lens assembly (5).
4. A four-sheet color filter-based screen defect detecting apparatus, comprising: the device comprises a camera (1), a wave-absorbing color filter (2), a three-piece type color filter wheel (3), a lens component (5) and a data processor (6);
the working interfaces of the camera (1), the wave elimination color filter (2), the three-piece type color filter wheel (3) and the lens component (5) are all arranged in parallel;
the camera (1) is arranged above the lens component (5) and is used for acquiring a screen image;
the lens assembly (5) comprises: a lens (52) and a mount (51);
the connecting ring (51) is rotationally connected with the lens (52) and is close to the three-piece type filter color wheel (3);
the wave-absorbing color filter (2) is arranged below the lens component (5) and is used for being matched with the three-piece type color filter wheel (3) to generate a superimposed color filtering effect;
the three-piece type filter color wheel (3) is arranged below the wave-eliminating color filter (2);
the three-plate color filter wheel (3) comprises: a rotating shaft (31) and a wheel disc (32);
the wheel disc (32) is rotationally fixed on the rotating shaft (31);
an X color filter (321), a Y color filter (322) and a Z color filter (323) are arranged on the wheel disc (32),
wherein, during the rotation of the wheel disc (32), at least 1 color filter corresponds to the wave elimination color filter (2);
the data processor (6) is connected with the camera (1) and is used for processing the image data transmitted by the camera (1).
5. A method for detecting screen defects based on a four-piece color filter, applied to the detection device according to any one of claims 1 to 4, wherein the method comprises:
determining parameters of the three-piece type filter wheel according to a preset rule, and determining parameters of the wave-absorbing filter according to spectral response curve parameters of the camera;
acquiring a superposed image of a screen to be tested after superposition of the parameters of the three-piece type filter wheel and the parameters of the wave-eliminating color filter;
calculating a tristimulus value according to the superposed image;
calculating chromaticity coordinate values according to the tristimulus values;
dividing image areas corresponding to adjacent chromaticity coordinate values in the same coordinate value range into areas with the same value;
and traversing each homonymous region, and determining the homonymous region with the chromaticity coordinate value fluctuation exceeding a preset fluctuation range as a defect region.
6. The detecting method according to claim 5, wherein the step of dividing the image areas corresponding to the adjacent chromaticity coordinate values in the same coordinate value range into areas of the same value comprises:
traversing each chromaticity coordinate value, and calculating the chromaticity difference value of two adjacent chromaticity coordinate values;
determining that the two chromaticity coordinate values corresponding to the chromaticity difference value with the absolute value smaller than or equal to a preset difference value are suspected identical values;
arranging the suspected identity values in a descending order;
and dividing each suspected identity value into an identity value area according to a rule that the absolute value of the difference value between the maximum suspected identity value and the minimum suspected identity value in the same group of the suspected identity values is less than or equal to a preset identity value difference range.
7. The detecting method according to claim 5, wherein the step of traversing each homonymous region and determining the homonymous region where the chromaticity coordinate value fluctuation exceeds a preset fluctuation range as a defective region comprises:
calculating chromaticity difference values of the homometric regions and preset screen chromaticity coordinate values;
if the chromaticity difference value is larger than or equal to a preset fluctuation range, the same-value area corresponding to the chromaticity difference value is a defect area;
and if the chromaticity difference value is smaller than a preset fluctuation range, the same-value area corresponding to the chromaticity difference value is a normal area.
8. The detection method according to claim 5, further comprising:
the screen to be tested adopts a single-color lighting picture.
9. The detection method according to claim 5, wherein the step of calculating tristimulus values from the superimposed image further comprises:
the tristimulus values respectively correspond to the stimulus values measured by superposing the X color filter, the Y color filter, the Z color filter and the evanescent wave color filter;
determining the stimulus value measured by superposing the Y color filter and the clip color filter as a brightness related value;
and acquiring the brightness information of the screen to be detected according to the brightness correlation value.
10. The detection method according to claim 5, further comprising:
acquiring the size to be measured of the screen to be measured;
and adjusting parameters of the detection device according to the size to be detected, wherein the parameters at least comprise the length of the connecting ring, the parameters of the lens and the height of the camera.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06160291A (en) * | 1992-11-16 | 1994-06-07 | Sharp Corp | Inspection system for display panel |
| JP2004120393A (en) * | 2002-09-26 | 2004-04-15 | Hitachi Kokusai Electric Inc | Chromaticity brightness measurement calibration system for panel picture quality inspecting device |
| CN1745385A (en) * | 2003-02-03 | 2006-03-08 | 光子动力学公司 | Method and apparatus for optical inspection of a display |
| CN101384948A (en) * | 2006-02-15 | 2009-03-11 | 株式会社东进世美肯 | System for testing flat panel display device and method thereof |
| CN101527108A (en) * | 2009-04-17 | 2009-09-09 | 天津光电星球显示设备有限公司 | Measuring method for colorimetric parameters of LED display screen |
| CN102540515A (en) * | 2012-01-12 | 2012-07-04 | 北京凌云光视数字图像技术有限公司 | Quality detection system for thin film transistor (TFT) liquid crystal display screen |
| CN105301810A (en) * | 2015-11-24 | 2016-02-03 | 上海斐讯数据通信技术有限公司 | Screen defect detecting method and screen defect detecting device |
| CN207197666U (en) * | 2017-08-26 | 2018-04-06 | 深圳天溯计量检测股份有限公司 | A kind of novel color luminance meter |
-
2018
- 2018-08-02 CN CN201810874818.4A patent/CN109141822B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06160291A (en) * | 1992-11-16 | 1994-06-07 | Sharp Corp | Inspection system for display panel |
| JP2004120393A (en) * | 2002-09-26 | 2004-04-15 | Hitachi Kokusai Electric Inc | Chromaticity brightness measurement calibration system for panel picture quality inspecting device |
| CN1745385A (en) * | 2003-02-03 | 2006-03-08 | 光子动力学公司 | Method and apparatus for optical inspection of a display |
| CN101384948A (en) * | 2006-02-15 | 2009-03-11 | 株式会社东进世美肯 | System for testing flat panel display device and method thereof |
| CN101527108A (en) * | 2009-04-17 | 2009-09-09 | 天津光电星球显示设备有限公司 | Measuring method for colorimetric parameters of LED display screen |
| CN102540515A (en) * | 2012-01-12 | 2012-07-04 | 北京凌云光视数字图像技术有限公司 | Quality detection system for thin film transistor (TFT) liquid crystal display screen |
| CN105301810A (en) * | 2015-11-24 | 2016-02-03 | 上海斐讯数据通信技术有限公司 | Screen defect detecting method and screen defect detecting device |
| CN207197666U (en) * | 2017-08-26 | 2018-04-06 | 深圳天溯计量检测股份有限公司 | A kind of novel color luminance meter |
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