CN111491155B - System and method for real-time correction of film playing type - Google Patents
System and method for real-time correction of film playing type Download PDFInfo
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- CN111491155B CN111491155B CN202010024452.9A CN202010024452A CN111491155B CN 111491155 B CN111491155 B CN 111491155B CN 202010024452 A CN202010024452 A CN 202010024452A CN 111491155 B CN111491155 B CN 111491155B
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- 238000003384 imaging method Methods 0.000 claims description 59
- 230000004048 modification Effects 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 9
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/204—Image signal generators using stereoscopic image cameras
- H04N13/239—Image signal generators using stereoscopic image cameras using two 2D image sensors having a relative position equal to or related to the interocular distance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/356—Image reproducers having separate monoscopic and stereoscopic modes
- H04N13/359—Switching between monoscopic and stereoscopic modes
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Abstract
The invention relates to a real-time correction system for the playing type of a film, which comprises: the playing control equipment is used for executing the switching of the playing of the film from the 3D type to the 2D type when the first control command is received and the type of the currently set playing film is the 2D type, and executing the switching of the playing of the film from the 2D type to the 3D type when the second control command is received and the type of the currently set playing film is the 3D type; and the image capturing device is arranged opposite to the film playing curtain and used for carrying out image capturing action on the curtain so as to obtain and output a corresponding curtain capturing picture. The invention also relates to a real-time film playing type correcting method. The system and the method for correcting the playing type of the film in real time are simple and convenient to control and intelligent to operate. The film playing type operation error can be corrected in real time according to the picture playing condition in time, so that the probability of film showing accidents is reduced.
Description
Technical Field
The invention relates to the field of projection equipment, in particular to a system and a method for correcting a film playing type in real time.
Background
The projector is a mechanical device which reproduces images and sounds recorded on a film in cooperation with a screen, a loudspeaker and the like.
There are various types of film projectors, and these are generally classified into two major categories, fixed type and mobile type. The projectors may be classified into various ones such as 70 mm, 35 mm, 16 mm, 8.75 mm, and 8 mm according to the width of a film to be projected. Projectors such as stereoscopic, panoramic, circular, dome, macroscreen and the like are also equipped for some special forms of movies.
The film feeding structure of the projector is used for feeding the coiled film from the film feeding disc to the film window for irradiation to project the picture, and the optical vocal cord signal is converted into audio current through the sound reproduction part of the projector. And then the screened film is reeled up again. It is composed of film feeding and receiving box (or film arm), film feeding gear for feeding, intermitting and receiving film, intermitting movement mechanism, various pulleys, film door and picture regulating device. The narrow film moving projector uses an intermittent film-grabbing mechanism to replace an intermittent film-conveying gear. The core part of the film projector is an intermittent motion mechanism which changes continuous rotation into intermittent rotation and is matched with a light shielding plate, so that a film stably stays at a film window when light passes through, and the film is clearly imaged on a screen; the light is quickly pulled down when being shielded so as to avoid exposing the trace when the film moves. The standard film movement speed is 24 grids/second and to reduce the flicker effect, the mask blocks light twice per grid, increasing the flicker frequency to 48 times per second.
Disclosure of Invention
In order to solve the technical problems in the related field, the invention provides a system and a method for modifying the playing type of a film in real time, which can introduce the definition of a picture as the classification characteristic of a 3D film and a 2D film so as to identify the playing type of the current film in real time and provide valuable reference data for modifying the subsequent playing type.
Therefore, the invention needs to have the following key invention points:
(1) identifying the current film playing type in real time according to the difference between the imaging characteristics of the film 3D type playing picture and the imaging characteristics of the film 2D type playing picture, and automatically correcting the playing type when the identification result does not accord with a set value;
(2) based on the characteristic that the imaging definition of a 3D picture for playing the film is lower than that of a 2D picture thereof, the imaging definition of the picture is introduced as a film playing picture imaging characteristic for identifying the film playing type.
According to an aspect of the present invention, there is provided a system for real-time modification of a film playing type, the system comprising:
the playing control equipment is used for executing the switching of the playing of the film from the 3D type to the 2D type when the first control command is received and the type of the currently set playing film is the 2D type;
the playing control equipment is also used for executing the switching of the playing of the film from the 2D type to the 3D type when a second control command is received and the type of the currently set playing film is the 3D type;
the characteristic storage equipment is used for storing the 3D picture imaging characteristic and the 2D picture imaging characteristic of the played film, and the 3D picture imaging characteristic and the 2D picture imaging characteristic of the played film are different;
the video capturing device is arranged opposite to the film playing curtain and used for carrying out image capturing action on the curtain so as to obtain and output a corresponding curtain capturing picture;
the geometric correction equipment is connected with the image intercepting equipment and is used for executing geometric correction processing on the received curtain intercepting picture so as to obtain a corresponding field correction image;
the definition analysis device is connected with the geometric correction device and is used for carrying out definition analysis operation on the received field correction image so as to obtain the integral picture definition of the field correction image;
the feature comparison device is respectively connected with the definition analysis device and the feature storage device and is used for sending a first control command when the image definition of the whole received field correction image is close to the 3D image definition of a played film;
the feature comparison equipment is further used for sending a second control command when the received picture definition of the whole live correction image is close to the 2D picture imaging definition of a played film;
wherein, in the feature storage device, the 3D picture imaging definition and the 2D picture imaging definition of the played film are stored, and the 3D picture imaging definition of the played film is lower than the definition of the 2D picture imaging definition;
the geometric correction device, the definition analysis device and the feature comparison device are all arranged in a control box of the image intercepting device accessory.
According to another aspect of the present invention, there is also provided a method for modifying a film playing type in real time, the method including:
using a play control device for executing the switching of the film play from the 3D type to the 2D type when the first control command is received and the type of the currently set play film is the 2D type;
the playing control equipment is also used for executing the switching of the playing of the film from the 2D type to the 3D type when a second control command is received and the type of the currently set playing film is the 3D type;
using a feature storage device for storing the 3D picture imaging feature and the 2D picture imaging feature of the played film, wherein the 3D picture imaging feature and the 2D picture imaging feature of the played film are different;
setting the opposite side of a film playing curtain by using an image capturing device, and performing image capturing action on the curtain to obtain and output a corresponding curtain capturing picture;
using a geometric correction device connected with the image capturing device and used for executing geometric correction processing on the received curtain capturing picture to obtain a corresponding field correction image;
using a definition analysis device connected with the geometric correction device and used for performing definition analysis operation on the received field correction image so as to obtain the integral picture definition of the field correction image;
using a feature comparison device, which is respectively connected with the definition analysis device and the feature storage device, and is used for sending a first control command when the image definition of the whole received field correction image is close to the 3D image definition of a played film;
the feature comparison equipment is further used for sending a second control command when the received picture definition of the whole live correction image is close to the 2D picture imaging definition of a played film;
wherein, in the feature storage device, the 3D picture imaging definition and the 2D picture imaging definition of the played film are stored, and the 3D picture imaging definition of the played film is lower than the definition of the 2D picture imaging definition;
the geometric correction device, the definition analysis device and the feature comparison device are all arranged in a control box of the image intercepting device accessory.
The system and the method for correcting the playing type of the film in real time are simple and convenient to control and intelligent to operate. The film playing type operation error can be corrected in real time according to the picture playing condition in time, so that the probability of film showing accidents is reduced.
Detailed Description
Embodiments of the present invention for real-time movie playback type modification system and method will be described in detail below.
A 3D film, also called a stereoscopic film (ANAGLYPH), is a three-dimensional film produced by superimposing two images, and when a viewer wears stereoscopic glasses to watch the film, the viewer feels personally on the scene.
The stereoscopic film is a film which can generate a stereoscopic effect and is produced by using the visual angle difference and the convergence function of the eyes of a person. Appeared in 1922. When the film is projected, two pictures are overlapped on the screen, and the left eye of the audience sees the picture shot from the left visual angle through special glasses of the audience or radial semi-cone lens grating in front of the screen, and the right eye sees the picture shot from the right visual angle, and the pictures are synthesized into a stereoscopic vision image through the convergence function of two eyes.
Stereoscopic movies are two-view images of a scene taken with two lenses, such as a camera for human eyes. Then synchronously projecting the images of two viewpoints by two projectors, and displaying the two slightly different images on a screen, wherein if the images are directly viewed by eyes, the viewed images are overlapped and are blurred, and a stereoscopic image is viewed, measures are taken to ensure that the left eye only sees the left image and the right eye only sees the right image, for example, a polaroid with opposite directions is respectively arranged in front of each projector and is used as a polarizer, the light emitted from the projectors passes through the polaroids to form polarized light, the polarization directions of the polaroids in front of the left and right projectors are mutually vertical, so that the polarization directions of the generated two polarized lights are mutually vertical, the two polarized lights are projected on the screen and then reflected to audiences, the polarization direction is not changed, and the audiences use the polarized glasses corresponding to the polarized lights to view the images, namely, only the left eye can see the images projected by the left projector, the right eye can only see the picture reflected by the right machine, so that a stereoscopic scene can be seen, which is the principle of the stereoscopic film. Complementary colors, switches, cylindrical lenses, slit gratings and the like are different modes for watching three-dimensional images on several screens on the basic principle that a left eye can see a left image and a right eye can see a right image. With the progress of science and technology, people can see a stereoscopic mode on a screen more.
In the prior art, the playing types of the movie are selectable in 3D and 2D, and different types of playing types are preferred by different types of viewers. For example, viewers wearing glasses prefer 3D movies, while viewers not wearing glasses prefer 2D movies, and if the movie is incorrectly played at the play scene due to a miss-play, the exposure of the problem is often accompanied by some hysteresis.
In order to overcome the defects, the invention builds a system and a method for correcting the playing type of the film in real time, and can effectively solve the corresponding technical problem.
The system for real-time correction of the playing type of a movie, which is shown according to the embodiment of the invention, comprises:
the playing control equipment is used for executing the switching of the playing of the film from the 3D type to the 2D type when the first control command is received and the type of the currently set playing film is the 2D type;
the playing control equipment is also used for executing the switching of the playing of the film from the 2D type to the 3D type when a second control command is received and the type of the currently set playing film is the 3D type;
the characteristic storage equipment is used for storing the 3D picture imaging characteristic and the 2D picture imaging characteristic of the played film, and the 3D picture imaging characteristic and the 2D picture imaging characteristic of the played film are different;
the video capturing device is arranged opposite to the film playing curtain and used for carrying out image capturing action on the curtain so as to obtain and output a corresponding curtain capturing picture;
the geometric correction equipment is connected with the image intercepting equipment and is used for executing geometric correction processing on the received curtain intercepting picture so as to obtain a corresponding field correction image;
the definition analysis device is connected with the geometric correction device and is used for carrying out definition analysis operation on the received field correction image so as to obtain the integral picture definition of the field correction image;
the feature comparison device is respectively connected with the definition analysis device and the feature storage device and is used for sending a first control command when the image definition of the whole received field correction image is close to the 3D image definition of a played film;
the feature comparison equipment is further used for sending a second control command when the received picture definition of the whole live correction image is close to the 2D picture imaging definition of a played film;
wherein, in the feature storage device, the 3D picture imaging definition and the 2D picture imaging definition of the played film are stored, and the 3D picture imaging definition of the played film is lower than the definition of the 2D picture imaging definition;
the geometric correction device, the definition analysis device and the feature comparison device are all arranged in a control box of the image intercepting device accessory.
Next, the detailed structure of the movie playback type real-time correction system of the present invention will be further described.
The system for real-time modification of film playing types may further include:
and the power supply voltage stabilizing device is used for providing voltage stabilizing operation for the voltage input into the definition analyzing device or the characteristic comparing device.
In the movie playback type real-time correction system:
the definition analysis equipment is internally provided with a timing unit used for providing reference timing signals for various operations of the definition analysis equipment.
In the movie playback type real-time correction system:
the characteristic comparison device includes a signal input unit and a signal output unit, both of which include a ground terminal.
The system for real-time modification of film playing types may further include:
and the field storage device is respectively connected with the definition analysis device and the feature comparison device and is used for storing various parameters for setting the definition analysis device or the feature comparison device.
The method for modifying the play type of a movie in real time according to the embodiment of the invention comprises the following steps:
using a play control device for executing the switching of the film play from the 3D type to the 2D type when the first control command is received and the type of the currently set play film is the 2D type;
the playing control equipment is also used for executing the switching of the playing of the film from the 2D type to the 3D type when a second control command is received and the type of the currently set playing film is the 3D type;
using a feature storage device for storing the 3D picture imaging feature and the 2D picture imaging feature of the played film, wherein the 3D picture imaging feature and the 2D picture imaging feature of the played film are different;
setting the opposite side of a film playing curtain by using an image capturing device, and performing image capturing action on the curtain to obtain and output a corresponding curtain capturing picture;
using a geometric correction device connected with the image capturing device and used for executing geometric correction processing on the received curtain capturing picture to obtain a corresponding field correction image;
using a definition analysis device connected with the geometric correction device and used for performing definition analysis operation on the received field correction image so as to obtain the integral picture definition of the field correction image;
using a feature comparison device, which is respectively connected with the definition analysis device and the feature storage device, and is used for sending a first control command when the image definition of the whole received field correction image is close to the 3D image definition of a played film;
the feature comparison equipment is further used for sending a second control command when the received picture definition of the whole live correction image is close to the 2D picture imaging definition of a played film;
wherein, in the feature storage device, the 3D picture imaging definition and the 2D picture imaging definition of the played film are stored, and the 3D picture imaging definition of the played film is lower than the definition of the 2D picture imaging definition;
the geometric correction device, the definition analysis device and the feature comparison device are all arranged in a control box of the image intercepting device accessory.
Next, the specific steps of the method for real-time modifying the film playing type according to the present invention will be further described.
The real-time movie playing type correction method may further include:
a power supply voltage stabilization device is used for providing a voltage stabilization operation for the voltage input to the sharpness analysis device or the feature comparison device.
The method for correcting the playing type of the video in real time comprises the following steps:
the definition analysis equipment is internally provided with a timing unit used for providing reference timing signals for various operations of the definition analysis equipment.
The method for correcting the playing type of the video in real time comprises the following steps:
the characteristic comparison device includes a signal input unit and a signal output unit, both of which include a ground terminal.
The real-time movie playing type correction method may further include:
and using an on-site storage device which is respectively connected with the definition analysis device and the feature comparison device and is used for storing various parameters for setting the definition analysis device or the feature comparison device.
In addition, the definition analysis device is an MCU controller. A Micro Control Unit (MCU), also called a Single Chip Microcomputer (Single Chip Microcomputer) or a Single Chip Microcomputer (MCU), is a Chip-level computer formed by appropriately reducing the frequency and specification of a Central Processing Unit (CPU) and integrating peripheral interfaces such as a memory, a counter (Timer), a USB, an a/D converter, a UART, a PLC, a DMA, etc., and even an LCD driving circuit on a Single Chip, and performing different combination control for different applications. Such as mobile phones, PC peripherals, remote controls, to automotive electronics, industrial stepper motors, robotic arm controls, etc., see the silhouette of the MCU.
The 32-bit MCU can be said to be the mainstream of the MCU market, the price of a single MCU is between 1.5 and 4 dollars, the working frequency is mostly between 100 and 350MHz, the execution efficiency is better, and the application types are also multiple. However, the length of the program code with the same function of the 32-bit MCU is increased by 30-40% compared with that of the 8/16-bit MCU due to the increase of the operand and the length of the memory, which causes that the capacity of the embedded OTP/FlashROM memory cannot be too small, and the number of external pins of the chip is greatly increased, thereby further limiting the cost reduction capability of the 32-bit MCU.
Finally, it should be noted that each functional device in the embodiments of the present invention may be integrated into one processing device, or each device may exist alone physically, or two or more devices may be integrated into one device.
The functions, if implemented in the form of software-enabled devices and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A system for real-time modification of film playing types, the system comprising:
the playing control equipment is used for executing the switching of the playing of the film from the 3D type to the 2D type when the first control command is received and the type of the currently set playing film is the 2D type;
the playing control equipment is also used for executing the switching of the playing of the film from the 2D type to the 3D type when a second control command is received and the type of the currently set playing film is the 3D type;
the characteristic storage equipment is used for storing the 3D picture imaging characteristic and the 2D picture imaging characteristic of the played film, and the 3D picture imaging characteristic and the 2D picture imaging characteristic of the played film are different;
the video capturing device is arranged opposite to the film playing curtain and used for carrying out image capturing action on the curtain so as to obtain and output a corresponding curtain capturing picture;
the geometric correction equipment is connected with the image intercepting equipment and is used for executing geometric correction processing on the received curtain intercepting picture so as to obtain a corresponding field correction image;
the definition analysis device is connected with the geometric correction device and is used for carrying out definition analysis operation on the received field correction image so as to obtain the integral picture definition of the field correction image;
the feature comparison device is respectively connected with the definition analysis device and the feature storage device and is used for sending a first control command when the image definition of the whole received field correction image is close to the 3D image definition of a played film;
the feature comparison equipment is further used for sending a second control command when the received picture definition of the whole live correction image is close to the 2D picture imaging definition of a played film;
wherein, in the feature storage device, the 3D picture imaging definition and the 2D picture imaging definition of the played film are stored, and the 3D picture imaging definition of the played film is lower than the definition of the 2D picture imaging definition;
the geometric correction device, the definition analysis device and the feature comparison device are all arranged in a control box of the image interception device accessory;
a power supply voltage stabilization device for providing a voltage stabilization operation for the voltage input to the sharpness analysis device or the feature comparison device;
a timing unit is arranged in the definition analysis equipment and used for providing reference timing signals for various operations of the definition analysis equipment;
the definition analysis equipment is an MCU controller, the MCU controller is also called a single chip microcomputer, the frequency and the specification of a central processing unit are reduced, components including a memory, a counter, a USB interface and an A/D converter, even an LCD driving circuit are integrated on a single chip to form a chip-level computer, and different combination control is carried out on different application occasions.
2. The system for real-time modification of film playback type as claimed in claim 1, wherein:
the characteristic comparison device includes a signal input unit and a signal output unit, both of which include a ground terminal.
3. The system for real-time modification of film playback type as claimed in claim 2, further comprising:
and the field storage device is respectively connected with the definition analysis device and the feature comparison device and is used for storing various parameters for setting the definition analysis device or the feature comparison device.
4. A method for modifying a film playing type in real time, the method comprising:
using a play control device for executing the switching of the film play from the 3D type to the 2D type when the first control command is received and the type of the currently set play film is the 2D type;
the playing control equipment is also used for executing the switching of the playing of the film from the 2D type to the 3D type when a second control command is received and the type of the currently set playing film is the 3D type;
using a feature storage device for storing the 3D picture imaging feature and the 2D picture imaging feature of the played film, wherein the 3D picture imaging feature and the 2D picture imaging feature of the played film are different;
setting the opposite side of a film playing curtain by using an image capturing device, and performing image capturing action on the curtain to obtain and output a corresponding curtain capturing picture;
using a geometric correction device connected with the image capturing device and used for executing geometric correction processing on the received curtain capturing picture to obtain a corresponding field correction image;
using a definition analysis device connected with the geometric correction device and used for performing definition analysis operation on the received field correction image so as to obtain the integral picture definition of the field correction image;
using a feature comparison device, which is respectively connected with the definition analysis device and the feature storage device, and is used for sending a first control command when the image definition of the whole received field correction image is close to the 3D image definition of a played film;
the feature comparison equipment is further used for sending a second control command when the received picture definition of the whole live correction image is close to the 2D picture imaging definition of a played film;
wherein, in the feature storage device, the 3D picture imaging definition and the 2D picture imaging definition of the played film are stored, and the 3D picture imaging definition of the played film is lower than the definition of the 2D picture imaging definition;
the geometric correction device, the definition analysis device and the feature comparison device are all arranged in a control box of the image interception device accessory;
using a power supply voltage stabilization device for providing a voltage stabilization operation for the voltage input to the sharpness analysis device or the feature comparison device;
a timing unit is arranged in the definition analysis equipment and used for providing reference timing signals for various operations of the definition analysis equipment;
the definition analysis equipment is an MCU controller, the MCU controller is also called a single chip microcomputer, the frequency and the specification of a central processing unit are reduced, components including a memory, a counter, a USB interface and an A/D converter, even an LCD driving circuit are integrated on a single chip to form a chip-level computer, and different combination control is carried out on different application occasions.
5. The method for real-time modification of film playback type as claimed in claim 4, wherein:
the characteristic comparison device includes a signal input unit and a signal output unit, both of which include a ground terminal.
6. The method for real-time modification of a film playing type as claimed in claim 5, further comprising:
and using an on-site storage device which is respectively connected with the definition analysis device and the feature comparison device and is used for storing various parameters for setting the definition analysis device or the feature comparison device.
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| CN202010024452.9A CN111491155B (en) | 2020-01-10 | 2020-01-10 | System and method for real-time correction of film playing type |
| GBGB2012591.0A GB202012591D0 (en) | 2020-01-10 | 2020-08-13 | System and method for real-time correction of video playback type |
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| CN202010024452.9A CN111491155B (en) | 2020-01-10 | 2020-01-10 | System and method for real-time correction of film playing type |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101731113B1 (en) * | 2010-08-25 | 2017-04-28 | 엘지디스플레이 주식회사 | 2d-3d image conversion method and stereoscopic image display using the same |
| CN108888975A (en) * | 2018-08-17 | 2018-11-27 | 浙江大丰实业股份有限公司 | Stage curtain integrity degree recognition mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2917845B1 (en) * | 2007-06-19 | 2011-08-19 | Christophe Brossier | METHOD OF VISUALIZING A SEQUENCE OF IMAGES PRODUCING A RELIEF SENSATION |
| CN102143372B (en) * | 2011-03-07 | 2013-01-09 | 宇龙计算机通信科技(深圳)有限公司 | Method, device and terminal for switching view |
| JP5100859B2 (en) * | 2011-04-25 | 2012-12-19 | 株式会社東芝 | Video processing apparatus and video processing method |
| CN204517983U (en) * | 2015-04-09 | 2015-07-29 | 康佳集团股份有限公司 | The naked-eye stereoscopic display device of 2D3D multi-section display and television set |
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2020
- 2020-01-10 CN CN202010024452.9A patent/CN111491155B/en active Active
- 2020-08-13 GB GBGB2012591.0A patent/GB202012591D0/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101731113B1 (en) * | 2010-08-25 | 2017-04-28 | 엘지디스플레이 주식회사 | 2d-3d image conversion method and stereoscopic image display using the same |
| CN108888975A (en) * | 2018-08-17 | 2018-11-27 | 浙江大丰实业股份有限公司 | Stage curtain integrity degree recognition mechanism |
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| CN111491155A (en) | 2020-08-04 |
| GB202012591D0 (en) | 2020-09-30 |
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