JP2012156970A - Secret filming preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for preventing secret screen filming with a video camera in a movie theater.SOLUTION: The amount of infrared light for secret filming prevention projected on a screen is changed according to a switching signal for the right eye and left eye pictures of a 3D movie that is based on a liquid crystal glass system. Thereby, the quality of a secretly filmed video is lowered, and the normal function of a secret filming device is interrupted to prevent secret filming. Since projection light used is invisible, it does not interfere with viewing of an audience.

Description

  The present invention prevents a voyeur from illegally sneaking a copyrighted work in a movie theater and gaining an unfair advantage by selling illegal copyrighted works, etc. The present invention relates to a device for preventing this.

  In the 1980s, so-called pirated videos of movies thought to have been created by recording screens in movie theaters and recording audio flowing in the hall began to circulate. This is thought to be due to the widespread use of video recording equipment for home use, making it easier to bring equipment into movie theaters. This kind of pirated version is inferior in image and sound quality compared to pirated copies copied from the official version of the media, but the effect on box office revenue is not negligible in that it will be released immediately after the movie is released to the public Met.

  Substituting in 1990, the performance and miniaturization of cameras and microphones made it possible to record and record movies in movie theaters more clearly and secretly. Furthermore, instead of analog video tapes that have been used mainly as a distribution medium for pirated copies so far, data replication and transmission methods based on digital technologies such as DVD and the Internet have become widespread, so that pirated copies are not degraded. It can be replicated and distributed around the world in a short time. As a result, the impact on box office revenue from the distribution of pirated editions became even more serious. According to MPA (Motion Picture Association of America), an overseas jurisdiction of the American Film Industry Association, the amount of damage in Japan due to pirated versions leaked due to voyeurism in Japanese movie theaters in 2005 was the sum of Japanese and foreign films It was 18 billion yen. And since the box office revenue in Japan in the same year was about 198 billion yen, he points out that the distribution of pirated editions has reduced the box office revenue by nearly 10%.

  On August 30, 2007, the “Act on the Prevention of Movie Voyeurism” was enacted, and the law made it possible to prevent voyeurism in movie theaters. Of course, this law is effectively used to prevent voyeurism, but in actual operation, difficult situations such as troubles with voyeurs and adverse effects on general customers not related to voyeurism are also expected. The introduction and operation of a device that detects and detects voyeurs is an important means for eradicating voyeurism, and the development of means for effectively preventing voyeurism is also desired.

As a conventional technique for copyright protection, the method according to Japanese Patent Application Laid-Open No. 2001-313006, which is Patent Document 1, introduces infrared light through an optical fiber to emit light, thereby preventing voyeurism. As a method disclosed in Japanese Patent Application Laid-Open No. 2002-197562 in Patent Document 2, an apparatus and a method for detecting the presence of a device for voyeurism and eavesdropping by the presence of infrared rays. Japanese Patent Application Laid-Open No. 2003-057553 of Patent Document 3 projects visible light on a screen during movie film frame advance to reduce the image quality of voyeurism. However, since visible light is projected, movie viewing is hindered. The method disclosed in Japanese Patent Laid-Open No. 2003-302960 in Patent Document 4 causes flickering in a voyeur video camera by switching the projected video between RGB display and RGBY display. The method disclosed in Japanese Patent Laid-Open No. 2005-026759 in Patent Document 5 is a digital watermark embedding method. As a method disclosed in Japanese Patent Application Laid-Open No. 2006-258651 in Patent Document 6, there is a method for determining and detecting reflected light of a video equipment lens used for voyeurism in order to prevent voyeurism in a movie theater. Japanese Patent Application Laid-Open No. 2009-282270 of Patent Document 7 is designed to reduce the quality of a voyeur image by projecting and scanning line or spot-like infrared light on a screen. Japanese Patent Application Laid-Open No. 2010-020263, Japanese Patent Application Laid-Open No. 2010-020263, filed by the same applicant as the present application, intends to provide a voyeurism prevention device that improves the drawbacks of these devices and sufficiently enhances the voyeurism prevention effect. Japanese Patent Laid-Open No. 2010-231748 in Reference 9 is omitted, but the details are omitted. The present invention does not adversely affect a bona fide audience as a screened image on a movie theater, but deteriorates the quality of a voyeurized video against malicious voyeurism and consequently prevents the distribution of illegal media. Yes.
JP 2001-313006 A JP 2002-197562 A JP 2003-057553 A JP 2003-302960 A Japanese Patent Laying-Open No. 2005-026759 JP 2006-258651 A JP 2009-282270 A

Japanese Patent Application Laid-Open No. 2010-020263, Japanese Patent Application Laid-Open No. 2010-020263, filed by the same applicant as the present application, intends to provide a voyeurism prevention device that improves the drawbacks of these devices and sufficiently enhances the voyeurism prevention effect. Japanese Patent Application Laid-Open No. 2010-231748 in Literature 9. In the method and apparatus described in JP 2010-020263 A and JP 2010-231748 A, when a strong infrared light is emitted from the screen toward the video camera, the automatic focusing mechanism of the video camera is distorted. The purpose is to create a defocused state forcibly in the video camera, and to deteriorate the video tapes, hard disks, etc. that have been voyeurized before they can be fully appreciated. In addition, the color filters used in image sensors such as CCDs used in video cameras allow the infrared light that should be cut off to pass through to some extent, making it invisible and powerful from the screen toward the audience. We proposed a voyeurism prevention device aimed at deteriorating the videotape, hard disk, and other images taken by irradiating infrared light until it could not stand.
JP 2010-020263 A JP 2010-231748 A

  The present invention is to sneak a three-dimensional (3D) video screened on a movie theater, prevent illegal gains by performing secondary illegal distribution of video content, and to give a disadvantage to the author and the box office. It is an object to provide a method and apparatus for preventing. 3D stereoscopic image viewing in a movie theater is a right-eye image projected on a two-dimensional plane screen and a left-eye image, a right-eye image is incident on the right eye, and a left-eye image is incident on the left eye. Recognize. The video separation function for both eyes includes a parallax barrier method and an integral method that do not require special glasses, but the glasses method is used in movie theaters that require the viewer's seating position freedom, a large screen, and resolution. Is the mainstream. At present, this special glasses is a liquid crystal method with the right-eye and left-eye transmission blocking function by liquid crystal, a polarized glasses method by linearly polarized light or circularly polarized light, and a deformed anaglyph glasses with visible light wavelength division by multilayer thin film applying red-blue glasses anaglyph It has become. These special glasses are classified into passive glasses using a modified anaglyph of polarized light or wavelength division of visible light and active glasses using liquid crystal. Polarized glasses, which are passive glasses, make up for the drawback of low light transmittance, and the screens in the movie theater require a silver screen with good reflection efficiency. The silver screen is different from the white screen used in conventional movie theaters in order to maintain the polarization characteristics of the image projected toward the center of the screen because the reflectance at the left and right ends of the screen screen is low. Is required.

  Screening with linearly polarized light and circularly polarized glasses requires a large screen to be replaced with a silver screen, which places a burden on the cinema. Under such circumstances, the liquid crystal glasses method that does not require the change of the movie theater infrastructure has become the mainstream. Switching the liquid crystal glasses to the left and right eyes using the liquid crystal shutter In order to recognize stereoscopic images due to binocular parallax, it is necessary to switch the left and right eyes of the liquid crystal glasses in synchronization with the right and left eye images projected on the screen. is there. This right eye / left eye switching signal projects a signal synchronized with the video projector onto the screen with infrared light. The liquid crystal glasses can visually recognize a stereoscopic image by detecting the infrared signal light projected on the screen and switching the right eye and the left eye.

  In the method and apparatus described in Japanese Patent Application Laid-Open No. 2010-020263 and Japanese Patent Application No. 2010-231748 by the same applicant as the present application, a strong infrared light is emitted from the screen toward the video camera, thereby automatically focusing the video camera. Utilizing the fact that the adjustment mechanism is out of order and forcibly creating a defocused state in the video camera to prevent unauthorized distribution of voyeur video, this is a switching signal for the right eye and left eye of the liquid crystal glasses Interfering with infrared light interferes with the switching of the right and left eyes of the LCD glasses. For this reason, viewing a stereoscopic movie and the method for preventing voyeurism are incompatible. The present invention provides a method and apparatus for preventing the sneak shot of a 3D movie by recognizing a 3D movie appreciation and the voyeurism prevention method.

  In addition, the present invention has an advantage that a function for preventing voyeurism can be maintained even if it is a normal 2D movie that is not a stereoscopic movie, and a screen conventionally used can be used as it is.

  According to the first aspect of the present invention, in order to achieve the above object, the switching infrared light signal of the left-eye and right-eye images of the liquid crystal glasses is projected toward the screen in synchronization with the projector that projects the stereoscopic movie on the screen. In movie theaters, an infrared signal detector for switching the left and right eye images of LCD glasses is installed near or behind the screen, and when the infrared light signal for switching the left and right eye images of LCD glasses is not detected, a voyeur video camera is used. A powerful infrared light that forcibly creates an out-of-focus state is emitted toward the screen, and when a switching infrared light signal is detected between the left and right eye images of the liquid crystal glasses, the voyeur video camera is forcibly created an out-of-focus state. It consists of a device that does not emit strong infrared light toward the screen. This configuration means that the strong infrared light for preventing voyeurism prevents the liquid crystal glasses sensor from confusion with the switching infrared light signal of the left eye and right eye images of the liquid crystal glasses.

  According to a second aspect of the present invention, in order to achieve the above object, the left eye of the liquid crystal glasses is projected in a movie theater which projects an infrared light signal for switching the left eye and right eye images of the liquid crystal glasses to the screen in synchronization with a projector that projects a stereoscopic movie on the screen. The right-eye video switching infrared signal detector is installed near or behind the screen, and the left-eye and right-eye switching infrared light signals of the LCD glasses are amplified or reduced to control and relay the infrared signal to control the left-eye and right-eye images. By emitting the infrared light of the switching signal, the voyeurism prevention infrared light emitted from the voyeur device itself and the left-eye and right-eye images are prevented from interfering with the infrared light of the switching signal, thereby realizing a reliable three-dimensional movie screening. This construction means ensures the function of the sensor of the liquid crystal glasses by matching the strong infrared light for preventing voyeurism and the switching infrared light signal of the left eye and right eye images of the liquid crystal glasses. In addition, the LCD glasses sensor has the function of amplifying or reducing the left- and right-eye switching infrared light signals of the liquid crystal glasses and emitting the infrared light of the left-eye and right-eye switching signals by controlling and relaying the infrared signals. Infrared light emission signal can be sent according to the light receiving sensitivity. It is also possible to set the infrared emission signal transmission level taking into account the reflection and transmission characteristics of the projection screen, so control the infrared signal level projected from the front of the screen and the infrared signal projected from the back. I can do it.

  The invention described in claim 3 is a voyeur camera according to claim 1, which detects a left-eye / right-eye switching infrared signal of a liquid crystal glasses-type 3D stereoscopic movie, and only when the detected signal pattern and repetition period are in a prescribed state. A voyeurism obstruction method and apparatus characterized by avoiding obstruction of the screening of a 3D stereoscopic movie by a voyeurism prevention device by stopping the emission of infrared light from the prevention device. The switching signal for the left eye and right eye of the liquid crystal glasses is given by a control pulse immediately before the right eye and left eye switching frame of the movie, but the operation for preventing voyeurism is ensured by recognizing the switching signal of the liquid crystal glasses method.

  According to a fourth aspect of the present invention, in the first aspect, instead of the infrared signal transmitting means built in the left-eye-right-switching infrared signal transmitting device of the liquid crystal glasses of the 3D stereoscopic movie placed beside the projector, The left-eye / right-eye switching signal of the liquid crystal glasses type 3D stereoscopic movie is sent to the voyeurism prevention device by light of a wavelength that does not interfere with the radio wave or the voyeurism prevention device, received or received by the voyeurism prevention device, and near 840 nm to 980 nm by the voyeurism prevention device. A voyeurism blocking method and apparatus characterized by performing conversion after converting to infrared light and performing a voyeurism prevention effect and transmission of a left-eye / right-eye switching signal of a 3D stereoscopic movie.

  The present invention according to the means of claims 1 to 4 realizes and provides a function for preventing a voyeurism of a movie in a movie theater even when a 3D stereoscopic movie is displayed, and automatically controls the devices related to the prevention of the voyeurism. It can be done.

    It is a structural example of the voyeurism prevention apparatus in the movie theater by this invention.     1 illustrates a configuration of a voyeurism-preventing infrared light generator and a 3D stereoscopic image liquid crystal glasses switching signal light receiver according to the present invention.     It is a structural example of the voyeurism prevention apparatus in the movie theater by this invention.     This is liquid crystal glasses for 3D stereoscopic video.     An example of the right eye left eye switching signal operation of the liquid crystal glasses for 3D stereoscopic video is shown.     2 is an example of a system embodiment according to the present invention.

  An embodiment embodying the present invention will be described with reference to the drawings. The drawing is schematically drawn for convenience of explanation. FIG. 1 is an explanatory view showing a configuration example of a sneak shot device and a voyeurism prevention device for a movie showing at a movie theater according to the present invention, and shows an embodiment of claim 1 of the present invention.

  FIG. 1 shows a movie theater configuration 100, which is roughly classified into a stage unit 107, a spectator seat unit 108, and a projection room 117 which are screen installation units. A voyeurism prevention device 101a, 101b that irradiates the back surface of the projection screen 106 with infrared light 102a, 102b on the floor 105 of the stage unit 107, and a receiving device that detects a switching signal for the left eye of the liquid crystal glasses when a 3D stereoscopic image is displayed. 103 is arranged and connected to the anti-voyeurism devices 101a and 101b. The liquid crystal glasses switching infrared light generator 114 in the projection room 117 projects the liquid crystal glasses switching infrared light signal on the front surface of the projection screen 106. Usually, the screen of 3D stereoscopic movie using liquid crystal glasses is translucent, and on the back of the screen 106, anti-voyeurism devices 101a and 101b and a receiving device 103 for detecting a switching signal for the left eye and right eye of the liquid crystal glasses are arranged. When the projection screen is totally reflective and not transmissive, the anti-peeping devices are arranged in front screen projection rather than back screen illumination.

  FIG. 1 shows a spectator seat 108 with a voyeur 109 and spectators 110a and 110b operating the voyeur video camera 111. Similarly, the projection room 117 projects (103) a 3D stereoscopic movie onto the screen 106 and an infrared signal (115) that irradiates (115) an infrared light signal for the left eye and right eye of the liquid crystal glasses toward the screen in accordance with a signal from the projector 112. An optical transmission device 114 is arranged.

  The voyeurism prevention method according to claim 1 having the configuration of FIG. 1 is to avoid interference between the voyeurism prevention infrared light and the switching infrared light signal of the left eye and the right eye of the 3D stereoscopic image liquid crystal glasses. Voyeurism prevention infrared light impairs the focus and illuminance sensitivity of the voyeur video camera and lowers the voyeur video quality, so it is stronger than the LCD glasses switching infrared signal, and the left-eye-right switching red of 3D stereoscopic LCD glasses In order to prevent the external light receiving sensor from functioning normally, a countermeasure is taken to prevent the voyeurism prevention infrared light from 101a101b from being emitted when there is switching infrared light of the left eye and right eye of the liquid crystal glasses. Switching the left eye and the right eye of the liquid crystal glasses in the projection room The infrared light signal irradiated (115) toward the screen from the infrared light signal transmission device 114 is received by the light receiving device 105, and the left eye and the right eye of the liquid crystal glasses for 3D stereoscopic video When there is a switching infrared light signal, by not irradiating the voyeurism prevention infrared light from the voyeurism prevention devices 101a, 101b, the voyeurism prevention infrared light and the switching infrared light signal of the left eye and the right eye of the 3D stereoscopic liquid crystal glasses are displayed. It is the structure which avoids that it interferes.

  FIG. 2 shows an enlarged detail view of the anti-voyeurism device on the cinema stage. Anti-voyeurism devices 201a and 201b that irradiate voyeurism prevention infrared light 206a, 206b, 206c, and 206d are disposed on the back of the screen 202, and the left-eye and right-eye switching infrared light signals 204 of the 3D stereoscopic image liquid crystal glasses are also disposed on the back of the screen. When receiving the switching infrared light signal of the left eye and the right eye of the liquid crystal glasses, the signal 205 for controlling the irradiation of the anti-voyeurism infrared light is generated from the receiving device. In the first aspect of the present invention, when there is a switching infrared light signal of the left eye and right eye of the liquid crystal glasses, the irradiation of the anti-voyeur infrared light is prohibited, but this is a switching infrared light projection of the left eye and right eye of the liquid crystal glasses from the projection room. By reflecting the signal on the screen. In order to switch and transmit the infrared light signal of the left and right eyes of the LCD glasses to the LCD glasses more securely, the infrared signal synchronized with the LCD glasses switching signal at a level that does not cause the malfunction of the infrared sensor of the LCD glasses is a voyeurism prevention signal It is also possible to transmit the switching infrared light signal of the left eye and the right eye of the liquid crystal glasses more reliably to the liquid crystal glasses by irradiating from the back of the screen.

  FIG. 3 is a system configuration perspective view 300 in the movie theater of the 3D stereoscopic movie voyeurism prevention device according to the present invention. The movie hall is classified into a stage 307, a spectator seat 308, and a projection room 317, and the stage floor 305 is transmitted from the projection room and the voyeurism prevention devices 301a and 301b that irradiate the back of the projection screen 306 with voyeur blocking infrared rays 302a and 302b. It comprises a receiving device that receives a switching infrared light signal of the left eye and right eye of the liquid crystal glasses and a control device 303. The reception and control device 303 controls the anti-voyeurism device 301 a 301 b with the control line 304. In the spectator seat 308, spectators 310a and 310b wearing 3D glasses, a voyeur 309, and a voyeur video camera 311 are shown. This is a configuration of a projector 312 for projecting (313) a 3D stereoscopic movie to a projection room 317 and a transmitter 314 for transmitting a switching signal 315 for the left eye and right eye of liquid crystal glasses.

  FIG. 4 shows liquid crystal glasses (400) used for 3D stereoscopic image viewing. A liquid crystal switch plate 402 that transmits or blocks the left-eye image and a sensor unit 403 that receives a switching signal for the left eye and right eye of the liquid crystal glasses that controls the liquid crystal switch plate 403 that transmits or blocks the right-eye image. The screen image projected from the projector by the liquid crystal glasses can be separated into a left-eye image and a right-eye image, and a 3D stereoscopic image using a binocular parallax image can be obtained.

  FIG. 5 shows a configuration 500 of the right eye / left eye switching signal of the liquid crystal glasses. Reference numeral 501 is an enlarged view of a control signal for switching the left-eye and right-eye liquid crystals. Reference numeral 503 denotes switching of the right eye left eye image by the right eye left eye switching signal. When the liquid crystal glasses receive the left eye switching signal 502a, the left eye sees the left eye image through the left eye liquid crystal plate. At this time, the right-eye liquid crystal plate is in a shielding state. When the liquid crystal glasses receive the right eye switching signal 502b, the right eye sees the right eye image through the right eye liquid crystal plate. At this time, the left-eye liquid crystal plate is in a shielding state. In this way, binocular parallax images are separated.

  FIG. 6 shows an embodiment of claim 2. A signal transmitter 603 for sending the right eye / left eye switching signal 607 of the liquid crystal glasses (609) in synchronism with the projector 602 is arranged, and a relay is provided by a control line 617 from the receiving device 615 for receiving (610) the right eye / left eye switching signal 607. Infrared light 611 whose level is controlled by the right-eye / left-eye switching signal 616 is sent to the liquid crystal glasses. At the same time, it controls voyeurism-preventing infrared light 614a and 614b to assist the screening of a good 3D movie.

  The embodiment of the present invention according to claim 3 stops the voyeurism disturbing infrared light projection from the voyeurism prevention device when the right eye / left eye switching signal of FIG. 5 is detected. The configuration is omitted because it is almost the same as that in FIG.

  The embodiment of the present invention according to claim 4 prevents the voyeurism-preventing infrared light from interfering with the right-eye / left-eye switching infrared light of the liquid crystal and does not interfere with the imaging-preventing near-infrared light of the liquid crystal switching signal synchronized with the projector. A configuration in which mid-infrared light or radio waves with an electromagnetic wave length are transmitted as a liquid crystal switching signal and received by a voyeurism prevention device, and infrared light with a voyeurism prevention effect is converted into an infrared wavelength that is a liquid crystal glasses switching signal and projected onto a screen It is.

100 Inventive Device Example 101a Peeping Prevention Device 101b Peeping Prevention Device 102a Peeping Prevention Infrared Light 102b Peeping Prevention Infrared Light 103 LCD Glasses Switching Infrared Light Receiving Device 104 Control Cable 105 Stage Floor 106 Projection Screen 107 Cinema Stage Unit 108 Audience Seat 109 Voyeur 110a Spectator 110b Spectator 111 Video camera 112 for voyeur 112 Projector 113 Video projection 114 Liquid crystal glasses switching infrared light transmission device 115 Liquid crystal glasses switching irradiation infrared light 116 Control cable 117 Projection room 200 Details of anti-voyeurism device 201a Voyeur Prevention device 201b Anti-voyeurism device 202 Projection screen 203 Liquid crystal glasses switching infrared light receiving device 204 Liquid crystal glasses switching infrared light 205 Control cable 206a Anti-voyeurism infrared light 206b Anti-voyeurism infrared light 206c Anti-voyeurism infrared light 206d Peeping prevention infrared light 300 Perspective view 301a Peeping prevention device 301b Peeping prevention device 302a Peeping prevention infrared light 302b Peeping prevention infrared light 303 LCD glasses switching infrared light receiving device 304 Control cable 305 Stage floor 306 Projection screen 307 Movie theater stage 308 Audience seat 309 Voyeur 310a Audience liquid crystal glasses 310b Audience liquid crystal glasses 311 Voyeur video camera 312 Projector 313 Video projection 314 Liquid crystal glasses switching infrared light transmitting device 315 Liquid crystal glasses switching irradiation infrared light 316 Control cable 317 Projection room 400 Liquid crystal glasses 401 Right eye liquid crystal shutter unit 402 Left eye liquid crystal shutter unit 403 Liquid crystal glasses switching infrared light receiving unit 500 Liquid crystal glasses left eye right eye switching signal configuration 501 Liquid crystal glasses left eye right eye switching signal enlarged view 5 02a LCD glasses left eye switching signal 502b LCD glasses right eye switching signal 503 LCD glasses left eye right eye image switching 504a Left eye image 504b Right eye image 600 Example 601 Projection room 602 Projector 603 LCD glasses switching infrared light transmitter 604 Control cable 605 Audience seat 606 Video projection 607 LCD glasses switching infrared light irradiation 608 Voyeur video camera 609 Liquid crystal glasses 610 Liquid crystal glasses switching infrared light reception 611 LCD glasses switching infrared light relay irradiation 612 Projection screen 613a Spy camera prevention device 613b Spy camera prevention device 614a Spy camera prevention red Outside light 614b Anti-voyeurism infrared light 615 Liquid crystal glasses switching infrared light receiver 616 Liquid crystal glasses switching infrared light relay transmitter 617 Control cable

Claims (4)

  In order to prevent voyeurism with a video camera in a so-called movie theater where a movie is viewed and viewed, voyeurism is achieved by projecting infrared light that is invisible to the eyes and reflected on the image sensor of the video camera toward the video camera from the screen direction. The voyeurism prevention device, which is characterized by the prevention of the movie, does not hinder the audience watching the movie, and the function of the video camera that performs the voyeurism is degraded, the brightness of the screen is detected by the brightness sensor, and the screen is dark When the screen is bright, the infrared light projected from the anti-camera device is slightly visible to the audience, but the influence on the video camera is invisible. For viewing images voyeurized by emitting infrared light with a large center wavelength of 800 to 900 nm toward the video camera near or behind the screen In order to prevent video camera sneak shots of 3D 3D movies screened in movie theaters, the left eye right eye switching infrared signal of 3D 3D movies using LCD glasses is detected and left eye right A voyeurism obstruction method and apparatus characterized by avoiding the obstruction of 3D stereoscopic movie screening by the voyeurism prevention device by stopping the emission of infrared light from the voyeurism prevention device as long as the eye switching infrared signal is present.   2. The unauthorized imaging interference method according to claim 1, wherein a left-eye / right-eye switching infrared signal of a liquid crystal glasses type 3D stereoscopic movie is detected, and the level control of the left-eye / right-eye switching infrared signal and an anti-voyeurism device are provided. A voyeurism blocking method and apparatus characterized by avoiding a 3D stereoscopic movie screening by a voyeurism prevention device by a relay function for performing signal control and assisting a good 3D stereoscopic movie screening.   2. The illegal imaging interference method according to claim 1, wherein a left-eye / right-eye switching infrared signal of a liquid crystal glasses 3D stereoscopic movie is detected, and the detected signal pattern and repetition cycle are in a prescribed state. As long as the voyeurism prevention device stops the emission of infrared light, the voyeurism prevention device prevents the voyeurism prevention device from interfering with the screening of the 3D stereoscopic movie.   In claim 1, in place of the infrared signal transmitting means incorporated in the left-eye and right-eye switching infrared signal transmitting device of the 3D stereoscopic movie liquid crystal glasses placed beside the projector, Sends the left-eye / right-eye switching signal of the liquid crystal glasses 3D stereoscopic movie to the anti-peeping device with the light of the wavelength that does not interfere, and receives or receives the light at the anti-peeping device, converts it to near-infrared light of 840 nm to 980 nm, and transmits it. A method and apparatus for blocking voyeurism, wherein the voyeurism prevention effect and transmission of a left-eye / right-eye switching signal for a 3D stereoscopic movie are performed together.

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