CN111429537A - Optical detection method, device and equipment for movie screen and intelligent network sensor - Google Patents
Optical detection method, device and equipment for movie screen and intelligent network sensor Download PDFInfo
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Abstract
The invention discloses an optical detection method, an optical detection device, optical detection equipment and an intelligent network sensor for a movie screen. The method comprises the following steps: acquiring an image of a film projected by the film screen; determining the gray value of each pixel point of the image; determining the screen brightness value corresponding to each pixel point according to the corresponding relation between the predetermined gray value and the brightness value; determining at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel point; comparing the at least one optical detection parameter with a preset corresponding parameter threshold range respectively; and when any optical detection parameter is out of the corresponding parameter threshold range, sending alarm information. According to the optical detection method of the film screen, provided by the invention, the optical parameters of the film screen can be monitored in real time.
Description
Technical Field
The invention relates to the technical field of computers, in particular to an optical detection method and device for a movie screen, computer equipment and an intelligent network sensor.
Background
In recent years, with the rapid development of the film market in China, the pursuit of people for viewing experience is gradually promoted. Wherein, the good screen vision has significant positive influence on the physical and psychological experience of the viewer. However, the film industry is lack of a mature screen optical detection technology, and especially, the cinema cannot monitor the optical parameters of the projection hall screen in real time.
It is to be noted that the above information disclosed in the background section is only for enhancement of understanding of the background of the invention, and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In view of the above, the present invention provides an optical detection method and apparatus for a movie screen, a computer device and an intelligent network sensor.
Additional features and advantages of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.
According to an aspect of the present invention, there is provided a method for optically inspecting a motion picture screen, comprising: acquiring an image of a film projected by the film screen; determining the gray value of each pixel point of the image; determining the screen brightness value corresponding to each pixel point according to the corresponding relation between the predetermined gray value and the brightness value; determining at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel point; comparing the at least one optical detection parameter with a preset corresponding parameter threshold range respectively; and when any optical detection parameter is out of the corresponding parameter threshold range, sending alarm information.
According to an embodiment of the invention, the at least one optical detection parameter comprises: and the brightness uniformity is determined by the quotient of the minimum screen brightness value in the image edge region and the screen brightness value of the image center pixel point.
According to an embodiment of the invention, the at least one optical detection parameter comprises: a sequential contrast determined by a quotient of a maximum screen brightness value and a minimum screen brightness value in the image.
According to an embodiment of the invention, the at least one optical detection parameter comprises: the intra-frame contrast is determined by the maximum value of a plurality of contrasts corresponding to a plurality of areas which are evenly divided by the image; the contrast corresponding to each region is determined by the quotient of the maximum screen brightness value and the minimum screen brightness value in the central range of each region.
According to an embodiment of the present invention, the contrast ratio corresponding to each region is determined by a quotient of a sum of a preset number of maximum screen brightness values and a sum of the preset number of minimum screen brightness values within a central range of each region.
According to an embodiment of the present invention, acquiring the image of the motion picture screen showing the movie includes: continuously acquiring a plurality of projected images of the film in a preset real-time projection period; determining the screen brightness value corresponding to each pixel point comprises: respectively determining a plurality of candidate screen brightness values corresponding to each pixel point on the corresponding positions of the plurality of images; and determining the maximum value in the candidate screen brightness values as the screen brightness value corresponding to each pixel point.
According to an embodiment of the present invention, when the film to be shown is a three-dimensional film, acquiring the image of the film shown on the movie screen includes: respectively acquiring a first image and a second image of the projected film through a left lens and a right lens of the three-dimensional glasses; determining the gray value of each pixel point of the image comprises: respectively determining a first gray value and a second gray value of each pixel point at corresponding positions of the first image and the second image; determining the screen brightness value corresponding to each pixel point comprises: respectively determining a first screen brightness value and a second screen brightness value corresponding to each pixel point on the corresponding positions of the first image and the second image; and determining the average value of the first screen brightness value and the second screen brightness value as the screen brightness value corresponding to each pixel point.
According to another aspect of the present invention, there is provided an optical inspection apparatus for a cinema screen, comprising: the image acquisition module is used for acquiring the image of the film projected by the film screen; the first determining module is used for determining the gray value of each pixel point of the image; the second determining module is used for determining the screen brightness value corresponding to each pixel point according to the corresponding relation between the predetermined gray value and the brightness value; the third determining module is used for determining at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel point; the parameter comparison module is used for comparing the at least one optical detection parameter with a preset corresponding parameter threshold range respectively; and the real-time alarm module is used for sending alarm information when any optical detection parameter is out of the range of the corresponding parameter threshold value.
According to still another aspect of the present invention, there is provided a computer apparatus comprising: the system comprises a memory, a processor and executable instructions stored in the memory and capable of running in the processor, wherein the processor executes the executable instructions to realize the optical detection method of any one movie screen.
According to still another aspect of the present invention, there is provided an intelligent network sensor, including: the system comprises acquisition equipment, an industrial control mainboard and a central processing unit; the acquisition equipment is used for acquiring the screen image, the industrial control mainboard is used for realizing the communication between the acquisition equipment and the central processing unit through a communication interface, and the central processing unit is used for executing any one of the above optical detection methods for the movie screen.
According to the optical detection method of the film screen, provided by the invention, the optical parameters of the film screen can be monitored in real time.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a flow chart illustrating a method for optical inspection of a motion picture screen according to an exemplary embodiment.
Fig. 2 is a flow chart illustrating another method for optical inspection of a motion picture screen according to an exemplary embodiment.
Fig. 3 is a flowchart illustrating a further method of optical inspection of a motion picture screen according to an exemplary embodiment.
Fig. 4 is a block diagram illustrating an optical inspection device for a motion picture screen according to an exemplary embodiment.
FIG. 5 is a schematic diagram illustrating a configuration of a computer device, according to an example embodiment.
FIG. 6 is a schematic diagram illustrating the structure of an intelligent network sensor, according to an example embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, apparatus, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
As described above, the present invention provides an optical detection method for a motion picture screen to meet the requirement of real-time monitoring of optical parameters of the screen. The following specifically describes embodiments of the present invention.
Fig. 1 is a flow chart illustrating a method for optical inspection of a motion picture screen according to an exemplary embodiment. The optical detection method of a motion picture screen as shown in fig. 1 can be applied, for example, to a real-time projection scene at each cinema auditorium.
Referring to fig. 1, the optical inspection method 10 for a motion picture screen includes:
in step S102, an image of a movie screen showing a movie is acquired.
The motion picture screen can be imaged by an image capture device (e.g., an industrial camera) after the projector enters a stable movie playback state.
In step S104, the gray value of each pixel point of the image is determined.
In step S106, a screen brightness value corresponding to each pixel point is determined according to a predetermined correspondence between a gray value and a brightness value.
Through a field experiment which is completed in advance, for example, the corresponding relation between the gray value and the brightness value of the pixel point can be determined to be a linear function relation, and the mathematical expression is L-K × Y + L a, wherein L is the brightness value of the screen, Y is the gray value, K is the slope of the relation curve measured by the experiment, and L a is the reference drift caused by noise, diffusion and other interferences of the industrial camera.
In step S108, at least one optical detection parameter of the movie screen is determined according to the screen brightness value corresponding to each pixel point.
In step S110, at least one optical detection parameter is compared with a preset corresponding parameter threshold range.
In step S112, when any one of the optical detection parameters is out of the corresponding parameter threshold range, alarm information is issued.
The optical detection parameters determined during the film projection process can be used to evaluate the hardware quality and the projection effect of the cinema auditorium. In some embodiments, the optical detection parameters may be evaluated based on a pre-established cinema comprehensive quality evaluation model, and an alarm may be issued for parameters beyond a standard range, so that the cinema may perform real-time projection adjustment to make the optical index of the movie screen meet a preset standard, thereby ensuring continuous good experience of the viewer.
It should be noted that, for different auditorium environment layouts and different film projection modes, the optical detection standard in the cinema comprehensive quality evaluation model can be set according to actual conditions.
According to the optical detection method of the movie screen provided by the embodiment of the invention, the optical parameters of the movie screen can be monitored in real time.
It should be clearly understood that the present disclosure describes how to make and use particular examples, but the principles of the present disclosure are not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
In some embodiments, the optical detection parameters may include: and the central brightness value of the screen corresponding to the central pixel point of the image.
In the cinema comprehensive quality evaluation model, the standard range set for the central brightness value of the screen can be 48 +/-10.2 cd/m2。
In some embodiments, the optical detection parameters may include: the brightness uniformity is determined by the quotient of the minimum screen brightness value in the image edge region and the screen brightness value of the image center pixel point.
The image edge area may be, for example, an area range with ten percent of the length of the edge of the film image, and the size of this area is not particularly limited by the present invention.
In the cinema comprehensive quality evaluation model, the standard range set for the luminance uniformity may be, for example, 75% to 90%.
In some embodiments, the optical detection parameters may include: sequential contrast determined by the quotient of the maximum screen brightness value and the minimum screen brightness value in the image.
In the cinema overall quality evaluation model, the standard range set for the sequential contrast may be, for example, ≧ 1200: 1.
In some embodiments, the optical detection parameters may include: and the intra-frame contrast is determined by the maximum value of the plurality of contrasts corresponding to the plurality of areas of the image average division.
For example, a film image can be divided into 4 (2 × 2) areas equally, 100 maximum screen brightness values in each area center range are respectively taken, the average value is taken as the maximum screen brightness value in the area center range, and the average value is taken as the minimum screen brightness value in the area center range.
The central range of each region may be, for example, a range of regions in which the center of each region occupies ten percent of the area of the region. Likewise, the scope of the present invention is not specifically limited.
In the cinema overall quality evaluation model, the standard ranges set for the intra-frame contrast may be, for example, ≧ 100:1(2D movies) and ≧ 50:1(3D movies).
For an actual continuous projection process, in some embodiments, step S102 may include: and continuously acquiring a plurality of images of the projected film within a preset real-time projection period.
Correspondingly, as shown in fig. 2, the step S106 may further include:
in step S1062, a plurality of candidate screen brightness values corresponding to each pixel point at corresponding positions of the plurality of images are determined.
In step S1064, the maximum value of the candidate screen brightness values is determined as the screen brightness value corresponding to each pixel point.
It should be noted that the above method of the present invention is applicable to both 2D movies and 3D movies. In particular, when the film being shown is a 3D film, with reference to fig. 3:
step S102 may further include:
in step S1022, a first image and a second image of the movie being shown are acquired through the left lens and the right lens of the three-dimensional glasses, respectively.
The three-dimensional glasses may be glasses composed of colored 3D lenses such as red and blue, red and green, and the like.
Correspondingly, step S104 may further include:
in step S1042, a first gray scale value and a second gray scale value of each pixel point at corresponding positions of the first image and the second image are determined respectively.
Step S106 may further include:
in step S1062, a first screen brightness value and a second screen brightness value corresponding to each pixel point at corresponding positions of the first image and the second image are determined respectively.
In step S1064, the average value of the first screen brightness value and the second screen brightness value is determined as the screen brightness value corresponding to each pixel point.
Those skilled in the art will appreciate that all or part of the steps implementing the above embodiments are implemented as computer programs executed by a CPU. The computer program, when executed by the CPU, performs the functions defined by the method provided by the present invention. The program may be stored in a computer readable storage medium, which may be a read-only memory, a magnetic or optical disk, or the like.
Furthermore, it should be noted that the above-mentioned figures are only schematic illustrations of the processes involved in the method according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Fig. 4 is a block diagram illustrating an optical inspection device for a motion picture screen according to an exemplary embodiment.
Referring to fig. 4, the optical inspection apparatus 40 for a cinema screen includes: an image acquisition module 402, a first determination module 404, a second determination module 406, a third determination module 408, a parameter comparison module 410, and a real-time alert module 412.
The image obtaining module 402 is configured to obtain an image of a movie projected on a movie screen.
The first determining module 404 is configured to determine a gray value of each pixel of the image.
The second determining module 406 is configured to determine, according to a predetermined correspondence between a gray value and a brightness value, a screen brightness value corresponding to each pixel point.
The third determining module 408 is configured to determine at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel point.
The parameter comparison module 410 is configured to compare at least one optical detection parameter with a preset corresponding parameter threshold range.
The real-time alarm module 412 is configured to send an alarm message when any of the optical detection parameters is outside the threshold range of the corresponding parameter.
According to the optical detection device of the movie screen provided by the embodiment of the invention, the optical parameters of the movie screen can be monitored in real time.
It is noted that the block diagrams shown in the above figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or program product. Thus, various aspects of the invention may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
FIG. 5 is a schematic diagram illustrating a configuration of a computer device, according to an example embodiment. It should be noted that the computer device shown in fig. 5 is only an example, and should not bring any limitation to the function and the scope of the application of the embodiment of the present invention.
As shown in fig. 5, the computer apparatus 800 includes a Central Processing Unit (CPU)801 that can perform various appropriate actions and processes in accordance with a program stored in a Read Only Memory (ROM)802 or a program loaded from a storage section 808 into a Random Access Memory (RAM) 803. In the RAM 803, various programs and data necessary for the operation of the apparatus 800 are also stored. The CPU 801, ROM 802, and RAM 803 are connected to each other via a bus 804. An input/output (I/O) interface 805 is also connected to bus 804.
To the I/O interface 805, AN input section 806 including a keyboard, a mouse, and the like, AN output section 807 including a network interface card such as a Cathode Ray Tube (CRT), a liquid crystal display (L CD), and the like, a speaker, and the like, a storage section 808 including a hard disk, and the like, and a communication section 809 including a network interface card such as a L AN card, a modem, and the like are connected, the communication section 809 performs communication processing via a network such as the internet, a drive 810 is also connected to the I/O interface 805 as necessary, a removable medium 811 such as a magnetic disk, AN optical disk, a magneto-optical disk, a semiconductor memory, and the like is mounted on the drive 810 as necessary, so that a computer program read out therefrom is mounted into the storage section 808 as.
In particular, according to an embodiment of the present invention, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the invention include a computer program product comprising a computer program embodied on a computer-readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication section 809 and/or installed from the removable medium 811. The computer program performs the above-described functions defined in the apparatus of the present invention when executed by the Central Processing Unit (CPU) 801.
It should be noted that the computer readable medium shown in the present invention can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present invention, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present invention may be implemented by software or hardware. The described units may also be provided in a processor, and may be described as: a processor includes a transmitting unit, an obtaining unit, a determining unit, and a first processing unit. The names of these units do not in some cases constitute a limitation to the unit itself, and for example, the sending unit may also be described as a "unit sending a picture acquisition request to a connected server".
As another aspect, the present invention also provides a computer-readable medium that may be contained in the apparatus described in the above embodiments; or may be separate and not incorporated into the device. The computer readable medium carries one or more programs which, when executed by a device, cause the device to comprise:
acquiring an image of a film projected by a film screen; determining the gray value of each pixel point of the image; determining the screen brightness value corresponding to each pixel point according to the corresponding relation between the predetermined gray value and the brightness value; determining at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel point; comparing at least one optical detection parameter with a preset corresponding parameter threshold range respectively; and when any optical detection parameter is out of the corresponding parameter threshold range, sending alarm information.
FIG. 6 is a schematic diagram illustrating the structure of an intelligent network sensor, according to an example embodiment. An intelligent network sensor as shown in fig. 6 may be arranged in a cinema auditorium, for example.
Referring to fig. 6, the intelligent network sensor 60 includes: the system comprises a collection device 602, an industrial control mainboard 604 and a central processing unit 606.
Wherein, the collecting device 602 is used for collecting the screen image. The acquisition device 602 may be, for example, an industrial camera of the MV-UBS131GC type, with an image sensor color depth of 12 bits and a resolution of up to 2 for grey scales12And (4) grading. By adjusting the exposure setting, the range can reach 0-200 cd/m2And is in the range of 20 to 200cd/m2Under the exposure setting of (2), the absolute measurement error of the optical system is not more than 1cd/m2The reference error does not exceed 0.6 percent.
The industrial control motherboard 604 is configured to implement communication between the acquisition device 602 and the central processing unit 606 through a communication interface, and a network communication Protocol of the industrial control motherboard may adopt HTTP (Hyper Text Transfer Protocol ), for example. The acquisition device 602 may be connected to an industrial control motherboard 604 through a USB interface, and the industrial control motherboard 604 may use, for example, a rui core micro RK3399 as a main control chip, so that the motherboard has a high integration level and a compact board size.
The central processor 606 is used to perform the steps according to various exemplary embodiments of the present invention described in the above-mentioned method embodiment section of the present specification. For example, the central processor 606 may perform the steps shown in fig. 1, 2, 3. The intelligent network sensor 60 may send a request to the backend server to obtain the optical detection standard in the cinema comprehensive quality evaluation model, so that the central processor 606 may execute the steps S110 to S112. When the intelligent network sensor 60 detects that any parameter exceeds the corresponding standard range, the alarm data can be sent to the background server side for visual display.
Exemplary embodiments of the present invention are specifically illustrated and described above. It is to be understood that the invention is not limited to the precise construction, arrangements, or instrumentalities described herein; on the contrary, the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. An optical inspection method for a motion picture screen, comprising:
acquiring an image of a film projected by the film screen;
determining the gray value of each pixel point of the image;
determining the screen brightness value corresponding to each pixel point according to the corresponding relation between the predetermined gray value and the brightness value;
determining at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel point;
comparing the at least one optical detection parameter with a preset corresponding parameter threshold range respectively; and
and when any optical detection parameter is out of the corresponding parameter threshold range, sending alarm information.
2. The method of claim 1, wherein the at least one optical detection parameter comprises: and the brightness uniformity is determined by the quotient of the minimum screen brightness value in the image edge region and the screen brightness value of the image center pixel point.
3. The method of claim 1, wherein the at least one optical detection parameter comprises: a sequential contrast determined by a quotient of a maximum screen brightness value and a minimum screen brightness value in the image.
4. The method of claim 1, wherein the at least one optical detection parameter comprises: the intra-frame contrast is determined by the maximum value of a plurality of contrasts corresponding to a plurality of areas which are evenly divided by the image; the contrast corresponding to each region is determined by the quotient of the maximum screen brightness value and the minimum screen brightness value in the central range of each region.
5. The method of claim 4, wherein the contrast ratio for each region is determined by a quotient of a sum of a predetermined number of maximum screen brightness values and a sum of the predetermined number of minimum screen brightness values over a center range of each region.
6. The method of any of claims 1-5, wherein obtaining the image of the motion picture screen showing a motion picture comprises: continuously acquiring a plurality of projected images of the film in a preset real-time projection period;
determining the screen brightness value corresponding to each pixel point comprises: respectively determining a plurality of candidate screen brightness values corresponding to each pixel point on the corresponding positions of the plurality of images; and determining the maximum value in the candidate screen brightness values as the screen brightness value corresponding to each pixel point.
7. Method according to any of claims 1-5, characterized in that, when the film being shown is a three-dimensional film,
acquiring the image of the movie projected by the movie screen comprises the following steps: respectively acquiring a first image and a second image of the projected film through a left lens and a right lens of the three-dimensional glasses;
determining the gray value of each pixel point of the image comprises: respectively determining a first gray value and a second gray value of each pixel point at corresponding positions of the first image and the second image;
determining the screen brightness value corresponding to each pixel point comprises: respectively determining a first screen brightness value and a second screen brightness value corresponding to each pixel point on the corresponding positions of the first image and the second image; and determining the average value of the first screen brightness value and the second screen brightness value as the screen brightness value corresponding to each pixel point.
8. An optical inspection apparatus for a motion picture screen, comprising:
the image acquisition module is used for acquiring the image of the film projected by the film screen;
the first determining module is used for determining the gray value of each pixel point of the image;
the second determining module is used for determining the screen brightness value corresponding to each pixel point according to the corresponding relation between the predetermined gray value and the brightness value;
the third determining module is used for determining at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel point;
the parameter comparison module is used for comparing the at least one optical detection parameter with a preset corresponding parameter threshold range respectively; and
and the real-time alarm module is used for sending alarm information when any optical detection parameter is out of the range of the corresponding parameter threshold value.
9. A computer device, comprising: memory, processor and executable instructions stored in the memory and executable in the processor, characterized in that the processor implements the method according to any of claims 1-7 when executing the executable instructions.
10. An intelligent network sensor, comprising: the system comprises acquisition equipment, an industrial control mainboard and a central processing unit; the acquisition equipment is used for acquiring screen images, the industrial control mainboard is used for realizing the communication between the acquisition equipment and the central processing unit through a communication interface, and the central processing unit is used for executing the method according to any one of claims 1-7.
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| CN113776787A (en) * | 2021-09-27 | 2021-12-10 | 歌尔光学科技有限公司 | Screen uniformity testing method and system of virtual reality equipment and related device |
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