CN111429537A - Optical detection method, device, equipment and intelligent network sensor for movie screen - Google Patents

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

Optical detection method, device, equipment and intelligent network sensor for movie screen

technical field

The present invention relates to the field of computer technology, and in particular, to an optical detection method, device, computer equipment and intelligent network sensor for a movie screen.

Background technique

In recent years, with the rapid development of my country's film market, people's pursuit of movie viewing experience has gradually increased. Among them, good screen vision has a significant positive impact on the physical and psychological experience of moviegoers. However, at present, the film industry lacks mature screen optical detection technology, especially theaters cannot monitor the optical parameters of the screen in the auditorium in real time.

It should 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 form the prior art that is already known to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an optical detection method, device, computer equipment and intelligent network sensor for a movie screen.

Other features and advantages of the present invention will become apparent from the following detailed description, or be learned in part by practice of the present invention.

According to an aspect of the present invention, an optical detection method for a movie screen is provided, including: acquiring an image of the movie screen showing a movie; determining the gray value of each pixel of the image; The corresponding relationship between the brightness values, determine the screen brightness value corresponding to each pixel point; according to the screen brightness value corresponding to each pixel point, determine at least one optical detection parameter of the movie screen; The corresponding parameter threshold range is compared; and when any optical detection parameter is outside the corresponding parameter threshold range, an alarm message is issued.

According to an embodiment of the present invention, the at least one optical detection parameter includes: brightness uniformity 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.

According to an embodiment of the present invention, the at least one optical detection parameter includes a sequential contrast ratio 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 present invention, the at least one optical detection parameter includes: an intra-frame contrast ratio determined by a maximum value among a plurality of contrasts corresponding to a plurality of regions equally divided by the image; wherein, the contrast corresponding to each region is It is determined by the quotient of the maximum screen brightness value and the minimum screen brightness value within the center range of each area.

According to an embodiment of the present invention, the contrast ratio corresponding to each region is determined by the quotient of the sum of the preset number of maximum screen brightness values and the sum of the preset number of minimum screen brightness values within the center range of each region.

According to an embodiment of the present invention, acquiring the images of the movie displayed on the movie screen includes: continuously acquiring multiple images of the displayed movie within a preset real-time displaying period; determining the screen brightness value corresponding to each pixel includes: : respectively determining a plurality of candidate screen brightness values corresponding to each pixel point at the corresponding position of the plurality of images; and determining the maximum value of the plurality of candidate screen brightness values as the screen brightness value corresponding to each pixel point.

According to an embodiment of the present invention, when the displayed movie is a 3D movie, acquiring the image of the movie displayed on the movie screen includes: obtaining the first image of the movie displayed through the left lens and the right lens of the 3D glasses, respectively. an image and a second image; determining the grayscale value of each pixel of the image includes: respectively determining the first grayscale value and the second grayscale value of each pixel at the corresponding position of the first image and the second image Determining the screen brightness value corresponding to each pixel includes: determining the first screen brightness value and the second screen brightness value corresponding to each pixel at the corresponding position of the first image and the second image respectively; and determining the The average value of the first screen brightness value and the second screen brightness value is the screen brightness value corresponding to each pixel point.

According to another aspect of the present invention, there is provided an optical detection device for a movie screen, comprising: an image acquisition module for acquiring an image of a movie displayed on the movie screen; a first determination module for determining each pixel of the image The gray value of the point; the second determination module is used to determine the screen brightness value corresponding to each pixel point according to the corresponding relationship between the predetermined gray value and the brightness value; the third determination module is used to determine the screen brightness value corresponding to each pixel point. a screen brightness value, for determining at least one optical detection parameter of the movie screen; a parameter comparison module for comparing the at least one optical detection parameter with a preset corresponding parameter threshold range; and a real-time alarm module for when When any optical detection parameter is outside the corresponding parameter threshold range, an alarm message will be issued.

According to yet another aspect of the present invention, there is provided a computer device comprising: a memory, a processor, and executable instructions stored in the memory and executable in the processor, the processor executing the executable instructions The optical detection method of any of the above-mentioned movie screens is realized when the instruction is given.

According to yet another aspect of the present invention, an intelligent network sensor is provided, comprising: a collection device, an industrial control mainboard and a central processing unit; wherein, the collection device is used for collecting screen images, and the industrial control mainboard is used for realizing all the data through a communication interface. Communication between the acquisition device and the central processing unit, where the central processing unit is configured to execute any of the above-mentioned optical detection methods for movie screens.

According to the optical detection method of the movie screen provided by the present invention, the optical parameters of the movie 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.

Description of 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. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a flow chart of an optical detection method for a movie screen according to an exemplary embodiment.

FIG. 2 is a flow chart of another optical detection method of a movie screen according to an exemplary embodiment.

FIG. 3 is a flow chart of still another optical detection method for a movie screen according to an exemplary embodiment.

Fig. 4 is a block diagram of an optical detection device for a movie screen according to an exemplary embodiment.

Fig. 5 is a schematic structural diagram of a computer device according to an exemplary embodiment.

Fig. 6 is a schematic structural diagram of an intelligent network sensor according to an exemplary embodiment.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various 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 repeated descriptions 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 in order to give a thorough understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or other methods, devices, steps, etc. may be employed. In other instances, well-known structures, methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

As mentioned above, in order to meet the requirement of real-time monitoring of the optical parameters of the screen, the present invention proposes an optical detection method for a movie screen. Hereinafter, each embodiment of the present invention will be specifically described.

FIG. 1 is a flow chart of an optical detection method for a movie screen according to an exemplary embodiment. The optical detection method of a movie screen as shown in FIG. 1 can be applied to, for example, real-time projection scenes in movie theaters.

Referring to FIG. 1, an optical detection method 10 of a movie screen includes:

In step S102, an image of the movie screened in the movie is acquired.

The movie screen is being imaged after the projector enters a stable movie playback state by means of an image capture device such as an industrial camera.

In step S104, the grayscale value of each pixel of the image is determined.

In step S106, the screen brightness value corresponding to each pixel point is determined according to the predetermined correspondence between the grayscale value and the brightness value.

Through pre-completed field experiments, for example, it can be determined that the corresponding relationship between the gray value of a pixel point and the luminance value is a linear function relationship, and the mathematical expression is: L=K×Y+La. Among them: L is the brightness value of the screen, Y is the gray value, K is the slope of the relationship curve measured by the experiment, and La is the reference drift caused by the noise and diffusion 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, the at least one optical detection parameter is respectively compared with a preset corresponding parameter threshold range.

In step S112, when any optical detection parameter is outside the corresponding parameter threshold range, an alarm message is issued.

The optical inspection parameters determined during the film projection can be used to evaluate the hardware quality and projection effect of the cinema auditorium. In some embodiments, the optical detection parameters can be evaluated based on the pre-established comprehensive quality evaluation model of the theater, and an alarm can be issued for parameters that exceed the standard range, so that the theater can adjust the projection in real time so that the optical indicators of the movie screen meet the preset requirements. standards to ensure a continuous good experience for moviegoers.

It should be noted that, for different auditorium environment layouts and different movie projection modes, the optical detection standards in the theater comprehensive quality evaluation model can be set according to the actual situation.

According to the optical detection method of the movie screen provided by the embodiment of the present invention, the optical parameters of the movie screen can be monitored in real time.

It should be clearly understood that this disclosure describes how to make and use specific examples and that the principles of this disclosure are not limited to any details of these examples. Rather, these principles can be applied to many other implementations based on the teachings of this disclosure.

In some embodiments, the optical detection parameters may include: the screen center brightness value corresponding to the image center pixel point.

In the cinema comprehensive quality evaluation model, the standard range set for the screen center brightness value may be, for example, 48±10.2cd/m ² .

In some embodiments, the optical detection parameters may include brightness uniformity 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.

For example, the image edge area can be selected as an area range of ten percent of the length of the long side inward from the edge of the film image, and the present invention does not specifically limit the size of this area.

In the cinema comprehensive quality evaluation model, the standard range set for brightness uniformity may be, for example, 75% to 90%.

In some embodiments, the optical detection parameter may include a sequential contrast ratio determined by the quotient of the maximum screen brightness value and the minimum screen brightness value in the image.

In the cinema comprehensive quality evaluation model, the standard range set for sequential contrast may be, for example, ≥1200:1.

In some embodiments, the optical detection parameter may include: an intra-frame contrast ratio determined by a maximum value of a plurality of contrast ratios corresponding to a plurality of regions of the image equally divided.

The contrast ratio corresponding to each area is determined by the quotient of the maximum screen brightness value and the minimum screen brightness value within the central range of each area. In some embodiments, the contrast ratio corresponding to each region is determined by the quotient of the sum of the preset number of maximum screen brightness values and the sum of the preset number of minimum screen brightness values within the center range of each region. For example: a film image can be divided into 4 (2×2) areas, respectively take 100 maximum screen brightness values within the center range of each area, and calculate the average value as the maximum screen brightness value within the center range of the area ; Take 100 minimum screen brightness values within the center range of each area, and calculate the average value as the minimum screen brightness value within the center range of the area.

For example, the center range of each area can be selected as the area range in which the center of each area occupies ten percent of the area of the area. Similarly, the present invention does not specifically limit the size of this range.

In the cinema comprehensive quality evaluation model, the standard range set for the intra-frame contrast ratio may be, for example, ≥100:1 (2D movie) and ≥50:1 (3D movie).

For the actual continuous screening process, in some embodiments, step S102 may include: continuously acquiring images of multiple screening films within a preset real-time screening period.

Correspondingly, as shown in FIG. 2 , step S106 may further include:

In step S1062, a plurality of candidate screen brightness values corresponding to each pixel point at the corresponding position of the plurality of images are determined respectively.

In step S1064, the maximum value among the plurality of 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 can be applied to both 2D movies and 3D movies. In particular, when the film to be shown is a 3D film, refer to Figure 3:

Step S102 may further include:

In step S1022, the first image and the second image of the movie being projected are acquired through the left lens and the right lens of the 3D glasses, respectively.

The three-dimensional glasses may be, for example, glasses composed of colored 3D lenses such as red, blue, red and green.

Correspondingly, step S104 may further include:

In step S1042, the first grayscale value and the second grayscale value of each pixel at the corresponding position of the first image and the second image are determined respectively.

Step S106 may further include:

In step S1062, the first screen brightness value and the second screen brightness value corresponding to each pixel at the corresponding position of the first image and the second image are respectively determined.

In step S1064, the average value of the brightness value of the first screen and the brightness value of the second screen is determined as the screen brightness value corresponding to each pixel point.

Those skilled in the art can understand that all or part of the steps for implementing the above-described embodiments are implemented as computer programs executed by the CPU. When the computer program is executed by the CPU, the above-mentioned functions defined by the above-mentioned methods provided by the present invention are executed. The program can be stored in a computer-readable storage medium, which can be a read-only memory, a magnetic disk, an optical disk, or the like.

In addition, it should be noted that the above-mentioned drawings are only schematic illustrations of the processes included in the method according to the exemplary embodiment of the present invention, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the chronological order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, in multiple modules.

The following are apparatus embodiments of the present invention, which can be used to execute method embodiments of the present invention. For details not disclosed in the device embodiments of the present invention, please refer to the method embodiments of the present invention.

Fig. 4 is a block diagram of an optical detection device for a movie screen according to an exemplary embodiment.

4 , the optical detection device 40 of a movie 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 alarm module 412 .

Wherein, the image acquisition module 402 is used for acquiring the image of the movie displayed on the movie screen.

The first determination module 404 is configured to determine the gray value of each pixel of the image.

The second determining module 406 is configured to determine the screen brightness value corresponding to each pixel point according to the predetermined correspondence between the grayscale value and the brightness value.

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 the at least one optical detection parameter with a preset corresponding parameter threshold range, respectively.

The real-time alarm module 412 is configured to issue an alarm message when any optical detection parameter is outside the corresponding parameter threshold range.

According to the optical detection device of the movie screen provided by the embodiment of the present invention, the optical parameters of the movie screen can be monitored in real time.

It should be noted that the block diagrams shown in the above figures are functional entities, and do not necessarily necessarily correspond to physically or logically independent entities. These functional entities may be implemented in 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, various aspects of the present invention may be implemented as a system, method or program product. Therefore, various aspects of the present invention can be embodied in the following forms: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software aspects, which may be collectively referred to herein as implementations "circuit", "module" or "system".

Fig. 5 is a schematic structural diagram of a computer device according to an exemplary embodiment. It should be noted that the computer device shown in FIG. 5 is only an example, and should not impose any limitations on the functions and scope of use of the embodiments of the present invention.

As shown in FIG. 5, a computer device 800 includes a central processing unit (CPU) 801, which can be loaded into a random access memory (RAM) 803 according to a program stored in a read only memory (ROM) 802 or a program from a storage section 808 Instead, various appropriate actions and processes are performed. In the RAM 803, various programs and data necessary for the operation of the device 800 are also stored. The CPU 801 , the ROM 802 , and the RAM 803 are connected to each other through a bus 804 . An input/output (I/O) interface 805 is also connected to bus 804 .

The following components are connected to the I/O interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 808 including a hard disk, etc. ; and a communication section 809 including a network interface card such as a LAN card, a modem, and the like. 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 needed. A removable medium 811, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is mounted on the drive 810 as needed so that a computer program read therefrom is installed into the storage section 808 as needed.

In particular, the processes described above with reference to the flowcharts may be implemented as computer software programs according to embodiments of the present invention. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the method illustrated in the flowchart. In such an embodiment, the computer program may be downloaded and installed from the network via the communication portion 809, and/or installed from the removable medium 811. When the computer program is executed by the central processing unit (CPU) 801, the above-described functions defined in the apparatus of the present invention are performed.

It should be noted that the computer-readable medium shown in the present invention may be a computer-readable signal medium or a computer-readable storage medium, or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. More specific examples of computer readable storage media may include, but are not limited to, electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable Programmable read only memory (EPROM or flash memory), fiber optics, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In the present invention, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present invention, however, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code therein. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device . Program code embodied on a computer readable medium may be transmitted using any suitable medium including, but not limited to, wireless, wireline, optical fiber 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 that contains one or more logical functions for implementing the specified functions executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the blocks 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 is also noted that each block of the block diagrams or flowchart illustrations, and combinations of blocks in the block diagrams or flowchart illustrations, can be implemented in special purpose hardware-based systems that perform the specified functions or operations, or can be implemented using A combination of dedicated hardware and computer instructions is implemented.

The units involved in the embodiments of the present invention may be implemented in a software manner, and may also be implemented in a hardware manner. The described unit may also be provided in a processor, for example, it may be described as: a processor includes a sending unit, an obtaining unit, a determining unit and a first processing unit. Wherein, the names of these units do not constitute a limitation on the unit itself under certain circumstances. For example, the sending unit may also be described as "a unit that sends a request for obtaining pictures to the connected server".

As another aspect, the present invention also provides a computer-readable medium, which may be included in the device described in the above embodiments; or may exist alone without being assembled into the device. The above-mentioned computer-readable medium carries one or more programs, and when the above-mentioned one or more programs are executed by a device, the device includes:

Obtain the image of the movie screen showing the film; determine the grayscale value of each pixel of the image; determine the screen brightness value corresponding to each pixel point according to the predetermined correspondence between the grayscale value and the brightness value; according to the screen corresponding to each pixel point brightness value, to determine at least one optical detection parameter of the movie screen; to compare the at least one optical detection parameter with the preset corresponding parameter threshold range respectively; and when any optical detection parameter is outside the corresponding parameter threshold range, an alarm message is issued .

Fig. 6 is a schematic structural diagram of an intelligent network sensor according to an exemplary embodiment. The intelligent network sensor as shown in FIG. 6 can be arranged, for example, in a cinema auditorium.

Referring to FIG. 6 , the intelligent network sensor 60 includes a collection device 602 , an industrial control motherboard 604 and a central processing unit 606 .

Among them, the acquisition device 602 is used to acquire screen images. The acquisition device 602 can be, for example, an MV-UBS131GC type industrial camera, the color depth of its image sensor is ¹² bits, and the resolution of gray scale can reach 212 levels. By adjusting the exposure setting, the range can reach 0～200cd/m ² , and under the exposure setting of 20～200cd/m ² , the absolute measurement error does not exceed 1cd/m ² , and the reference error does not exceed 0.6%.

The industrial control mainboard 604 is used to realize the communication between the acquisition device 602 and the central processing unit 606 through a communication interface, and the network communication protocol thereof may be, for example, HTTP (Hyper Text Transfer Protocol, hypertext transfer protocol). The acquisition device 602 can be connected to the industrial control main board 604 through a USB interface, for example, and the industrial control main board 604 can use Rockchip RK3399 as the main control chip, so as to make the main board highly integrated and compact.

The central processing unit 606 is configured to execute the steps according to various exemplary embodiments of the present invention described in the above method embodiment section of this specification. For example, the central processing unit 606 may perform the steps shown in FIGS. 1 , 2 and 3 . Wherein, the intelligent network sensor 60 may send a request to the backend server to request to obtain the optical detection standard in the cinema comprehensive quality evaluation model, so that the central processor 606 can execute the above steps S110-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 for visual display.

Exemplary embodiments of the present invention have been specifically shown and described above. It should be understood that the invention is not limited to the details of construction, arrangements, or implementations 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 detection method of a movie screen, is characterized in that, comprises: obtaining an image of the movie screen showing the film; determining the gray value of each pixel of the image; Determine the screen brightness value corresponding to each pixel point according to the predetermined correspondence between the gray value and the brightness value; Determine at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel; respectively comparing the at least one optical detection parameter with a preset corresponding parameter threshold range; and When any optical detection parameter is outside the threshold range of the corresponding parameter, an alarm message is issued. 2 . The method according to claim 1 , wherein the at least one optical detection parameter comprises: being determined by the quotient of the minimum screen brightness value in the edge region of the image and the screen brightness value of the central pixel of the image. 3 . brightness uniformity. 3. The method of claim 1, wherein the at least one optical detection parameter comprises: a sequential contrast ratio determined by a quotient of a maximum screen brightness value and a minimum screen brightness value in the image. 4. The method according to claim 1, wherein the at least one optical detection parameter comprises: an intra-frame contrast determined by a maximum value among a plurality of contrasts corresponding to a plurality of regions equally divided by the image; wherein , the contrast ratio corresponding to each area is determined by the quotient of the maximum screen brightness value and the minimum screen brightness value within the center range of each area. 5. The method according to claim 4, wherein the contrast ratio corresponding to each area is determined by the sum of a preset number of maximum screen brightness values and the preset number of minimum screen brightness values within the center range of each area. and the quotient is determined. 6. The method according to any one of claims 1-5, wherein acquiring the images of the films projected on the movie screen comprises: continuously acquiring images of multiple projected films within a preset real-time presentation period. image; Determining the screen brightness value corresponding to each pixel point includes: respectively determining a plurality of candidate screen brightness values corresponding to each pixel point on the corresponding positions of the multiple images; and determining the maximum value of the multiple candidate screen brightness values as each pixel. Click the corresponding screen brightness value. 7. The method according to any one of claims 1-5, wherein, when the displayed film is a three-dimensional film, Acquiring the image of the movie displayed on the movie screen includes: acquiring the first image and the second image of the movie displayed through the left lens and the right lens of the 3D glasses, respectively; Determining the grayscale value of each pixel point of the image includes: respectively determining the first grayscale value and the second grayscale value of each pixel point at the corresponding positions of the first image and the second image; Determining the screen brightness value corresponding to each pixel includes: respectively determining the first screen brightness value and the second screen brightness value corresponding to each pixel at the corresponding position of the first image and the second image; and determining the first screen brightness value The average value of the screen brightness value and the second screen brightness value is the screen brightness value corresponding to each pixel point. 8. An optical detection device for a movie screen, characterized in that, comprising: an image acquisition module for acquiring an image of the movie screen showing the film; a first determining module for determining the grayscale value of each pixel of the image; The second determining module is configured to determine the screen brightness value corresponding to each pixel point according to the predetermined correspondence between the grayscale value and the brightness value; a third determination module, configured to determine at least one optical detection parameter of the movie screen according to the screen brightness value corresponding to each pixel; a parameter comparison module for comparing the at least one optical detection parameter with a preset corresponding parameter threshold range; and The real-time alarm module is used to issue an alarm message when any optical detection parameter is outside the corresponding parameter threshold range. 9. A computer device, comprising: a memory, a processor, and executable instructions stored in the memory and executable in the processor, wherein the processor implements the executable instructions when the processor executes the instructions The method of any one of claims 1-7. 10. An intelligent network sensor, comprising: a collection device, an industrial control mainboard and a central processing unit; wherein, the collection device is used to collect screen images, and the industrial control mainboard is used to realize the collection device through a communication interface Communication with the central processing unit for performing the method of any of claims 1-7.

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