CN113848044A - Method for detecting brightness and chrominance consistency of display screen - Google Patents
Method for detecting brightness and chrominance consistency of display screen Download PDFInfo
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Abstract
The invention discloses a method for detecting the consistency of brightness and chrominance of a display screen, which comprises the following steps: acquiring a detection image of a display screen to be detected through a first filter, and respectively acquiring first response values of a plurality of pixel points on the detection image under the first filter; acquiring a detection image of the display screen to be detected through a second filter with a different transmittance curve from that of the first filter, and respectively obtaining second response values of a plurality of pixel points under the second filter; representing the center wavelength of the corresponding pixel point according to the ratio of the first response value to the second response value to obtain the center wavelength difference between different pixel points; and judging the chromaticity consistency of each pixel point on the display screen to be tested according to the central wavelength difference. The spectrum deviation of the measured light source can be directly judged, the chromaticity and brightness uniformity of the measured light source can be further judged, and the problems that an imaging colorimeter or an imaging brightness meter is required to be calibrated and a probe type color analyzer limits the measurement space and the measurement distance are solved.
Description
Technical Field
The invention belongs to the technical field of display detection, and particularly relates to a method for detecting brightness and chromaticity consistency of a display screen.
Background
The uniformity of the chromaticity and brightness of the display screen is always the focus of the quality control of the display screen, and comprises the chromaticity and brightness consistency of different positions of the same screen body, the chromaticity and brightness consistency of different viewing angles at the same position and the like. The screen body chromaticity and brightness nonuniformity are improved by a Demura technology, namely, compensation data is generated based on image acquisition data to compensate the nonuniformity of a display screen. The uniformity of the screen body after Demura repair is usually confirmed by measuring the chromaticity and brightness of multiple points, and only several screens in the same batch can be measured for evaluation by offline, rather than monitoring each screen on a production line in real time. In addition, the multi-point brightness of the screen is usually measured by a probe type color analyzer, which means that the screen to be measured is large enough to measure the chromaticity and brightness at multiple positions, and the size of the current micro led display screen which is popular in the display screen technology field is usually smaller than 1 inch, so the multi-point measurement method is not applicable.
The AR/VR display screen has a large view field, particularly the VR display screen, the immersive experience requirement of the AR/VR display screen requires that the view field of the display screen is as high as 120 degrees or more, and requirements are provided for the uniformity of the chromaticity and brightness of the display screen under different view fields. The AR/VR equipment structure is special, and the display screen need match the lens and become an enlarged virtual image, and the whole field of vision of display screen, whole virtual image promptly can only be observed to the entrance pupil of people's eye or luminance chromaticity measurement equipment department at the exit pupil of AR/VR equipment. In this case, a method of evaluating uniformity by multipoint measurement using a probe-type color analyzer is less feasible for two reasons: the exit pupil diameter of the AR/VR device is only a few mm, and the space is insufficient; secondly, the distance between the virtual image of the AR/VR equipment and the exit pupil is far larger than the measurement distance required by the color analyzer, so that the color analyzer cannot accurately measure the chromaticity and brightness of the virtual image.
The essence of the chromaticity and brightness change of the display screen or other light sources is the spectral change, and both the conventional display screen and the AR/VR equipment need a device capable of rapidly detecting the spectral change of the display screen to monitor the chromaticity and brightness uniformity of the screen body in real time.
At present, two schemes are mainly used for measuring the uniformity of the chromaticity and brightness of the display screen, wherein a probe type color analyzer is used for carrying out multi-point measurement, and the uniformity of the whole screen body is monitored based on an area array imaging colorimeter. The first method has requirements on space, is not suitable for display screens with small sizes, such as micro LEDs and the like, has requirements on measuring distance, and is not suitable for scenes with large measuring distance, such as AR/VR modules and the like. The second method is limited by the spectral variation of the screen body in the measurement accuracy of the chromaticity and the brightness, and if the spectral difference of different positions of the screen body is large, the measurement accuracy is greatly reduced, and the chromaticity and the brightness uniformity of the screen body can be misjudged. Therefore, a device suitable for accurately detecting the chromaticity and brightness uniformity of various screen bodies with various sizes is needed in the market. The uniformity of chromaticity and brightness of a display screen or other light sources is substantially the spectrum consistency, and there are many devices for measuring the spectrum of the display screen on the market, such as a multi-point spectrometer, but only limited points can be measured, such as a hyperspectral camera, but the cost is high, and the problem of crosstalk caused by the dark angle of a lens is difficult to solve, such as using a LVF, but the cost is also high.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a method for detecting the brightness and chromaticity consistency of a display screen, which can directly judge the spectral shift of a detected light source so as to judge the chromaticity and brightness uniformity of the detected light source, and avoids the problems that an imaging colorimeter or an imaging brightness meter is required to be adopted in a calibration process, and a probe type color analyzer limits the measurement space and the measurement distance.
In one aspect, an embodiment of the present invention provides a method for detecting luminance and chrominance consistency of a display screen, including: acquiring a detection image of a display screen to be detected through a first filter, and respectively acquiring first response values of a plurality of pixel points on the detection image under the first filter; acquiring a detection image of the display screen to be detected through a second filter with a different transmittance curve from the first filter, and respectively obtaining second response values of a plurality of pixel points under the second filter; characterizing the center wavelength of the corresponding pixel point by the ratio of the first response value to the second response value to obtain the center wavelength difference between different pixel points; and judging the chromaticity consistency of each pixel point on the display screen to be tested according to the central wavelength difference.
In an embodiment of the present invention, the characterizing the center wavelength of the corresponding pixel point by a ratio of the first response value to the second response value includes: acquiring a first response relation representing the first response value and the central wavelength; acquiring a second response relation representing the second response value and the central wavelength; and characterizing the mapping relation between the first response value and the center wavelength and the mapping relation between the second response value and the center wavelength by the ratio of the first response relation to the second response relation.
In an embodiment of the present invention, a first corresponding relationship exists between the spectral response of the pixel point and the wavelength, a second corresponding relationship exists between the transmittance of the first filter and the wavelength, and a third corresponding relationship exists between the transmittance of the second filter and the wavelength; characterizing the first response relationship by an integral of a product of the first correspondence relationship and the second correspondence relationship; characterizing the second response relationship by an integral of a product of the first correspondence relationship and the third correspondence relationship.
In an embodiment of the present invention, the determining the chromaticity consistency of each pixel point on the display screen to be tested includes: calculating a first threshold range of a ratio of the first response value to the second response value based on an allowable degree of chroma unevenness; and when the ratio of the first response value to the second response value of the pixel point is judged to meet the first threshold range, the chromaticity of the corresponding pixel point meets the consistency requirement.
In an embodiment of the present invention, the method for detecting brightness and chrominance consistency of a display screen further includes: calculating a second threshold range of corresponding camera response values based on the allowable degree of brightness non-uniformity; and when the first response value or the second response value of the pixel point is judged to meet the second threshold range, the brightness of the corresponding pixel point meets the consistency requirement.
On the other hand, an embodiment of the present invention provides a device for detecting luminance and chrominance consistency of a display screen, including: the first response value obtaining module is used for obtaining a detection image of a display screen to be detected through a first filter and respectively obtaining first response values of a plurality of pixel points on the detection image under the first filter; a second response value obtaining module, configured to obtain a detection image of the display screen to be detected through a second filter having a different transmittance curve from the first filter, and obtain second response values of the pixel points under the second filter respectively; the difference acquisition module is used for representing the central wavelength of the corresponding pixel point according to the ratio of the first response value to the second response value to obtain the central wavelength difference between different pixel points; and the chromaticity judgment module is used for judging the chromaticity consistency of each pixel point on the display screen to be tested according to the central wavelength difference.
In an embodiment of the present invention, the difference obtaining module is specifically configured to: acquiring a first response relation representing the first response value and the central wavelength; acquiring a second response relation representing the second response value and the central wavelength; and characterizing the mapping relation between the first response value and the center wavelength and the mapping relation between the second response value and the center wavelength by the ratio of the first response relation to the second response relation.
In an embodiment of the present invention, the device for detecting luminance and chrominance consistency of a display screen further includes: the brightness judging module is used for calculating a second threshold value range of the corresponding camera response value based on the allowable brightness unevenness degree; and when the first response value or the second response value of the pixel point is judged to meet the second threshold range, the brightness of the corresponding pixel point meets the consistency requirement.
In another aspect, an embodiment of the present invention provides a system for detecting luminance and chrominance consistency of a display screen, including: the device comprises a memory and one or more processors connected with the memory, wherein the memory stores a computer program, and the processors are used for executing the computer program to realize the method for detecting the brightness and chroma consistency of the display screen.
In another aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to execute the method for detecting brightness and chrominance consistency of a display screen according to any one of the above embodiments.
As can be seen from the above, the above solution contemplated by the present invention may have one or more of the following advantages compared to the prior art:
(1) the method has the advantages that the response values of a detected light source under two filters with different transmittance curves are obtained, the spectral shift of each pixel point on the display screen can be directly judged based on the ratio of the response values of the two filters, the uniformity of the chromaticity and brightness of the display screen can be further judged, the necessary calibration process of an imaging colorimeter or the imaging brightness meter is not needed, the measurement space and the measurement distance are not required and limited like a probe type color analyzer, the application scene is wide, the method can be applied to a conventional display screen or a micro LED display screen with a small size or an AR/VR module with a special structure and the like, the application scene is high in precision and efficiency, the application method is simple, the chromaticity uniformity of the display screen can be monitored in real time on a production line, and the blank of the technical field is filled;
(2) by establishing a calculation model according to the mapping relation between the ratio of the response values of the detected light source under the two lenses and the corresponding center wavelength, whether spectral shift exists between each pixel point on the display screen to be detected can be accurately judged according to the ratio, and the spectral center wavelength difference value, namely the spectral shift, corresponding to each pixel point can be calculated based on the model;
(3) by calculating the second threshold value range of the corresponding camera response value fluctuation based on the allowable brightness nonuniformity, the brightness consistency of each pixel point on the display screen can be judged by comparing the response value fluctuation of each pixel point under the same filter.
Other aspects and features of the present invention will become apparent from the following detailed description, which proceeds with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
Drawings
Fig. 1 is a flowchart of a method for detecting luminance and chrominance consistency of a display screen according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a spectral response of a pixel and a corresponding relationship between a filter transmittance and a wavelength according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a corresponding relationship between transmittance and wavelength of a light source under a first filter and a second filter according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a camera response of a light source under a first filter and a second filter as a function of center wavelength according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a mapping relationship between a camera response value and a center wavelength of a light source under a first filter and a second filter according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a device for detecting luminance and chrominance consistency of a display screen according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a device for detecting luminance and chrominance uniformity of a display screen according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a system for detecting luminance and chrominance consistency of a display screen according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present invention.
Description of the reference numerals
S11-S14: a step of detecting the consistency of brightness and chrominance of the display screen;
20: a display screen brightness and chroma consistency detection device; 201: a first response value obtaining module; 202: a second response value obtaining module; 203: a difference acquisition module; 204: a chrominance judgment module; 205: a brightness judging module;
30: a system for detecting the brightness and chromaticity consistency of a display screen; 31: a processor; 32: a memory;
40: a computer readable storage medium.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The invention will be described in connection with embodiments with reference to the drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments should fall into the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the method is simple. The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the division of the embodiments of the present invention is only for convenience of description and should not be construed as a limitation, and features of various embodiments may be combined and referred to each other without contradiction.
As shown in fig. 1, a first embodiment of the present invention provides a method for detecting luminance and chrominance consistency of a display screen, for example, the method includes the following steps: step S11, acquiring a detection image of a display screen to be detected through a first filter, and respectively acquiring first response values of a plurality of pixel points on the detection image under the first filter; step S12, acquiring a detection image of the display screen to be detected through a second filter with a different transmittance curve from the first filter, and respectively obtaining second response values of a plurality of pixel points under the second filter; step S13, characterizing the center wavelength of the corresponding pixel point by the ratio of the first response value to the second response value, to obtain the center wavelength difference between different pixel points; and step S14, judging the chromaticity consistency of each pixel point on the display screen to be tested according to the central wavelength difference.
In step S11, for example, a camera photographs a display screen to be detected to obtain a detection image, an upper computer obtains the detection image, and determines the brightness and chrominance consistency of each pixel point on the detection image. Reference to a host computer is made, for example, to a personal computer, hand-held device, portable device, tablet device, multiprocessor system, microprocessor-based system, editable consumer electronics, network PC, minicomputer, mainframe computer, distributed computing environment that includes any of the above systems or devices, and the like.
Specifically, the camera obtains a detection image of the display screen to be detected through the first filter, and obtains first response values of a plurality of pixel points on the detection image under the first filter respectively, and the first response values are obtained by calculating the photon sensing intensity of the camera photosensitive film and are sent to the upper computer for subsequent detection processing.
In step S12, the camera obtains a detection image of the display screen to be detected, for example, through a second filter having a different transmittance curve from the first filter, so that second response values of corresponding pixels under the second filter can be obtained in the same manner.
Specifically, a light source for detecting a certain pixel point on an image is exemplified by a B light source (blue light source), a spectrum of the B light source and transmittance curves of the first lens and the second lens are illustrated in fig. 2, for example, it should be noted that the above examples are only schematic illustrations of the present solution, and an actual bright and chroma detection process cannot directly acquire a spectrum of a light source on a display screen. In summary, the two band pass filters are characterized in that the transmittances of the two band pass filters are not 0 when the B light source is used as the light source, that is, the transmittance curves of the two band pass filters partially cover the waveband where the B light source is located, so as to ensure that the response of the camera is not zero when the filter is used for capturing the light source.
The spectral intensity distribution curve of the B light source can be assumed to be gaussian, i.e. the first correspondence between spectral response and wavelength is characterized by equation (1):
where L is the intensity of the light source, e is the natural constant, λ is the wavelength of the B light source, λ p is the center wavelength of the B light source, σ0Is the standard deviation of the intensity distribution of the B-illuminant. The transmittance curves of the two band-pass filters are also assumed to be gaussian distribution, that is, the second corresponding relation and the third corresponding relation between the transmittance and the wavelength of the first filter and the second filter can be represented as an expression (2) and an expression (3) respectively; wherein, formula (2):
in which B is1Is the transmittance of the first filter, λ1Is the central wavelength, σ, of the first filter1Is the standard deviation of the transmittance distribution of the first filter; formula (3):
in which B is2Is the transmittance of the second lens, λ2Is the central wavelength, σ, of the second lens2Is the standard deviation of the second lens transmittance distribution.
In one embodiment, the first response relationship between the first response value and the center wavelength is characterized, for example, by an integral of the product of the first correspondence and the second correspondence; the second response relationship between the second response value and the center wavelength is characterized by an integral of the product of the first correspondence relationship and the third correspondence relationship. Specifically, when the B light source is used as the light source, the responses of the cameras under the two filters can be represented by formula (4):
(ii) a Formula (5):
。
of course, in other embodiments of the present invention, the response relationship between the response value and the center wavelength may be characterized by other calculation methods, for example, a modification method such as weighting factor of the above equation (4) or equation (5), and the present invention is not limited thereto.
For example, assume that the center wavelength λ p =470nm of the B light source, and the standard deviation σ0=5, center wavelength λ of first filter1=450nm, standard deviation σ1=10nm, center wavelength λ of the second filter2=480nm, standard deviation σ2And 10nm, the response of the B light source under two filters is shown in fig. 3. When the center wavelength of the B light source is changed at 455-470nm, the response curves of the two filters in the wavelength range from 401 to 520nm along with the change curve of the center wavelength of the B light source are shown in FIG. 4.
In step S13, for example, the ratio of the first response value to the second response value is used to characterize the center wavelength of the corresponding pixel point, i.e., the ratio R = S1/S2 of S1 to S2. Therefore, the central wavelength difference between different pixel points can be obtained according to the R value difference between the pixel points on the detection image.
In step S14, for example, after the upper computer calculates the R value of each pixel, the chromaticity consistency of each pixel on the display screen to be tested is determined according to the central wavelength difference represented by the R value. If the chromaticity of the screen body is uniform, the R value calculated by each pixel point is a constant, in one embodiment, a first threshold range of corresponding R value fluctuation can be calculated based on an allowable chromaticity non-uniformity degree, the chromaticity is considered to be uniform if the R value corresponding to each pixel point of the camera is within the first threshold range, and if the R value fluctuation exceeds the first threshold range, it is determined that there is a spectrum deviation. Therefore, the spectral shift of the light source to be measured can be directly judged, the chromaticity and brightness uniformity of the light source can be further judged, and the problems that an imaging colorimeter or an imaging brightness meter needs to be calibrated and a probe type color analyzer limits the measurement space and the measurement distance are solved.
Further, since the foregoing example obtains the first response relationship and the second response relationship of the B-light source under the first filter and the second filter, for example, the mapping relationship between the first response value and the center wavelength and the second response value is characterized by the ratio of the first response relationship to the second response relationship. Specifically, the logarithm of the ratio R of the responses of the two filters, i.e. the change of log10(R) with the center wavelength of the B light source, is shown in fig. 5, and it can be seen from fig. 5 that the logarithm of the response ratio of the two filters changes linearly with the center wavelength of the B light source, i.e. the mapping relationship of the foregoing characterization. Therefore, the corresponding central wavelength of the light source can be accurately calculated based on the logarithm, and if the logarithm is constant, namely the response ratio of the two filters is constant, the central wavelength is constant, namely, no spectrum shift exists, and the chromaticity is uniform. And the spectrum center wavelength difference value, namely the spectrum offset, corresponding to each pixel point can be calculated based on the model.
Further, the method for detecting brightness and chrominance consistency of a display screen provided in this embodiment further calculates a second threshold range of corresponding fluctuation of camera response values based on the allowable brightness unevenness, compares the fluctuation of the response values of the pixels under the same filter, and considers that the brightness is uniform if the brightness is within the allowable second threshold range.
In addition, it is worth mentioning that in other embodiments of the present invention, the detection image of the display screen to be detected may also be obtained through a greater number of filters, where every two filters with different transmittance curves are used as a group to respectively obtain the response values to implement the above detection mode, and the scheme of the present invention is not limited by the number of the filters.
In summary, in the method for detecting brightness and chromaticity consistency of a display screen according to the first embodiment of the present invention, response values of a detected light source under two filters having different transmittance curves are obtained, spectral shifts of each pixel point on the display screen can be directly determined based on a ratio of the response values of the two filters, and further, chromaticity and luminance uniformity of the display screen can be determined, a calibration process necessary for an imaging colorimeter or an imaging luminance meter is not required, a measurement space and a measurement distance are not required and limited as a probe type color analyzer, and an application scenario is wide, so that the method can be applied to a conventional display screen or a small-sized micro led display screen or an AR/VR module with a special structure and has high precision and high efficiency, and an application scenario is simple and wide, and is convenient for real-time monitoring of chromaticity and luminance uniformity of the display screen on a production line, and fills a gap in the technical field; by establishing a calculation model according to the mapping relation between the ratio of the response values of the detected light source under the two lenses and the corresponding center wavelength, whether spectral shift exists between each pixel point on the display screen to be detected can be accurately judged according to the ratio, and the spectral center wavelength difference value, namely the spectral shift, corresponding to each pixel point can be calculated based on the model; by calculating the second threshold value range of the corresponding camera response value fluctuation based on the allowable brightness nonuniformity, the brightness consistency of each pixel point on the display screen can be judged by comparing the response value fluctuation of each pixel point under the same filter.
As shown in fig. 6, a second embodiment of the present invention provides a device 20 for detecting luminance and chrominance uniformity of a display screen, for example, comprising: a first response value obtaining module 201, a second response value obtaining module 202, a difference obtaining module 203 and a chromaticity judging module 204.
The first response value obtaining module 201 is configured to obtain a detection image of a display screen to be detected through a first filter, and obtain first response values of a plurality of pixel points on the detection image under the first filter respectively. The second response value obtaining module 202 is configured to obtain a detection image of the display screen to be detected through a second filter having a transmittance curve different from that of the first filter, and obtain second response values of the pixel points under the second filter respectively. The difference obtaining module 203 is configured to characterize the center wavelength of the corresponding pixel point by using a ratio of the first response value to the second response value, so as to obtain a center wavelength difference between different pixel points. The chromaticity judging module 204 is configured to judge chromaticity consistency of each pixel point on the display screen to be detected according to the central wavelength difference.
Further, the difference obtaining module 203 is specifically configured to: acquiring a first response relation representing the first response value and the central wavelength; acquiring a second response relation representing the second response value and the central wavelength; and characterizing the mapping relation between the first response value and the center wavelength and the mapping relation between the second response value and the center wavelength by the ratio of the first response relation to the second response relation.
Furthermore, a first corresponding relation exists between the spectral response and the wavelength of the pixel point, a second corresponding relation exists between the transmittance of the first filter and the wavelength, and a third corresponding relation exists between the transmittance of the second filter and the wavelength; characterizing the first response relationship by an integral of a product of the first correspondence relationship and the second correspondence relationship; characterizing the second response relationship by an integral of a product of the first correspondence relationship and the third correspondence relationship.
Further, the chromaticity determination module 204 is specifically configured to: calculating a first threshold range of a ratio of the first response value to the second response value based on an allowable degree of chroma unevenness; and when the ratio of the first response value to the second response value of the pixel point is judged to meet the first threshold range, the chromaticity of the corresponding pixel point meets the consistency requirement.
Further, as shown in fig. 7, the device 20 for detecting luminance and chrominance uniformity of a display screen according to the present invention further includes: a brightness judging module 205, configured to calculate a second threshold range of the corresponding camera response value based on the allowable brightness unevenness degree; and when the first response value or the second response value of the pixel point is judged to meet the second threshold range, the brightness of the corresponding pixel point meets the consistency requirement.
The method for detecting the uniformity of the brightness and the chrominance of the display screen implemented by the device 20 for detecting the uniformity of the brightness and the chrominance of the display screen disclosed by the second embodiment of the present invention is as described in the first embodiment, and therefore, a detailed description thereof is omitted. Optionally, each module and the other operations or functions in the second embodiment are respectively for implementing the method described in the first embodiment, and the beneficial effects of this embodiment are the same as those of the first embodiment, and for brevity, are not described herein again.
As shown in fig. 8, a third embodiment of the present invention provides a system 30 for detecting luminance and chrominance uniformity of a display screen, for example, comprising: a memory 32 and one or more processors 31 coupled to the memory 32. The memory 32 stores a computer program, and the processor 31 is used for executing the computer program to implement the method for detecting brightness and chrominance consistency of the display screen according to the first embodiment. The specific method may refer to the method described in the first embodiment, and details are not repeated herein for brevity, and the beneficial effect of the display screen brightness and chrominance consistency detection system 30 provided in this embodiment is the same as that of the display screen brightness and chrominance consistency detection method provided in the first embodiment.
As shown in fig. 5, a fourth embodiment of the present invention provides a computer-readable storage medium 40, where the computer-readable storage medium 40 is a non-volatile memory and stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, for example, the one or more processors execute the method for detecting brightness and chrominance consistency of a display screen according to the first embodiment. For the sake of brevity, details are not repeated herein, and the beneficial effect of the computer-readable storage medium 40 provided by this embodiment is the same as that of the method for detecting brightness and chrominance consistency of the display screen provided by the first embodiment.
In addition, it should be understood that the foregoing embodiments are merely exemplary illustrations of the present invention, and the technical solutions of the embodiments can be arbitrarily combined and collocated without conflict between technical features and structural contradictions, which do not violate the purpose of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and/or method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units/modules is only one logical division, and there may be other divisions in actual implementation, for example, multiple units or modules 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/modules described as separate parts may or may not be physically separate, and parts displayed as units/modules may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units/modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, each functional unit/module in the embodiments of the present invention may be integrated into one processing unit/module, or each unit/module may exist alone physically, or two or more units/modules may be integrated into one unit/module. The integrated units/modules may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units/modules.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for detecting brightness and chrominance consistency of a display screen is characterized by comprising the following steps:
acquiring a detection image of a display screen to be detected through a first filter, and respectively acquiring first response values of a plurality of pixel points on the detection image under the first filter;
acquiring a detection image of the display screen to be detected through a second filter with a different transmittance curve from the first filter, and respectively obtaining second response values of a plurality of pixel points under the second filter;
characterizing the center wavelength of the corresponding pixel point by the ratio of the first response value to the second response value to obtain the center wavelength difference between different pixel points; and
and judging the chromaticity consistency of each pixel point on the display screen to be tested according to the central wavelength difference.
2. The method for detecting brightness and chrominance consistency of a display screen according to claim 1, wherein the step of representing the center wavelength of the corresponding pixel point by the ratio of the first response value to the second response value comprises:
acquiring a first response relation representing the first response value and the central wavelength;
acquiring a second response relation representing the second response value and the central wavelength;
and characterizing the mapping relation between the first response value and the center wavelength and the mapping relation between the second response value and the center wavelength by the ratio of the first response relation to the second response relation.
3. The method according to claim 2, wherein a first correspondence relationship exists between the spectral response of the pixel point and the wavelength, a second correspondence relationship exists between the transmittance of the first filter and the wavelength, and a third correspondence relationship exists between the transmittance of the second filter and the wavelength; characterizing the first response relationship by an integral of a product of the first correspondence relationship and the second correspondence relationship; characterizing the second response relationship by an integral of a product of the first correspondence relationship and the third correspondence relationship.
4. The method for detecting the brightness and chromaticity consistency of the display screen according to claim 1, wherein the step of determining the chromaticity consistency of each pixel point on the display screen to be detected comprises:
calculating a first threshold range of a ratio of the first response value to the second response value based on an allowable degree of chroma unevenness;
and when the ratio of the first response value to the second response value of the pixel point is judged to meet the first threshold range, the chromaticity of the corresponding pixel point meets the consistency requirement.
5. The method for detecting the brightness and chrominance consistency of the display screen according to claim 1, further comprising:
calculating a second threshold range of corresponding camera response values based on the allowable degree of brightness non-uniformity;
and when the first response value or the second response value of the pixel point is judged to meet the second threshold range, the brightness of the corresponding pixel point meets the consistency requirement.
6. A display screen brightness and chrominance consistency detection device is characterized by comprising:
the first response value obtaining module is used for obtaining a detection image of a display screen to be detected through a first filter and respectively obtaining first response values of a plurality of pixel points on the detection image under the first filter;
a second response value obtaining module, configured to obtain a detection image of the display screen to be detected through a second filter having a different transmittance curve from the first filter, and obtain second response values of the pixel points under the second filter respectively;
the difference acquisition module is used for representing the central wavelength of the corresponding pixel point according to the ratio of the first response value to the second response value to obtain the central wavelength difference between different pixel points;
and the chromaticity judgment module is used for judging the chromaticity consistency of each pixel point on the display screen to be tested according to the central wavelength difference.
7. The device for detecting the brightness and chrominance consistency of a display screen according to claim 6, wherein the difference obtaining module is specifically configured to:
acquiring a first response relation representing the first response value and the central wavelength;
acquiring a second response relation representing the second response value and the central wavelength;
and characterizing the mapping relation between the first response value and the center wavelength and the mapping relation between the second response value and the center wavelength by the ratio of the first response relation to the second response relation.
8. The apparatus for detecting luminance and chrominance uniformity of a display screen according to claim 6, further comprising:
the brightness judging module is used for calculating a second threshold value range of the corresponding camera response value based on the allowable brightness unevenness degree;
and when the first response value or the second response value of the pixel point is judged to meet the second threshold range, the brightness of the corresponding pixel point meets the consistency requirement.
9. A system for detecting brightness and chrominance consistency of a display screen is characterized by comprising: a memory and one or more processors connected to the memory, the memory storing a computer program, the processors being configured to execute the computer program to implement the method for detecting brightness and chrominance consistency of a display screen according to any one of claims 1 to 5.
10. A computer-readable storage medium storing computer-executable instructions for performing the method of detecting brightness and chrominance consistency of a display screen according to any one of claims 1 to 5.
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