WO2007043577A1

WO2007043577A1 - Record preventing device and method

Info

Publication number: WO2007043577A1
Application number: PCT/JP2006/320314
Authority: WO
Inventors: Shinji Suzuki
Original assignee: Pioneer Corporation
Priority date: 2005-10-14
Filing date: 2006-10-11
Publication date: 2007-04-19

Abstract

A record preventing device (100) to be placed in a projection space (10) includes a plurality of light sources (110) constituted to emit invisible lights and made independent of each other, and a control device (120) for controlling the light sources individually. The control device (120) controls the individual light sources on the basis of such pieces of control information stored in a storage unit (122) and corresponding to a plurality of aging patterns to be imparted to the irradiation characteristics of an invisible light as correspond to the aging pattern selected through an input unit (123). According to this control, the invisible light is given such an aging in its irradiation characteristics that the irradiation position or the brightness at the irradiation position is changed by scanning it either vertically and horizontally or obliquely.

Description

Specification

Recording prevention apparatus and method

Technical field

[0001] The present invention relates to a technical field of a recording prevention apparatus and method for preventing illegal recording of video content such as a movie, for example.

Background art

[0002] As this type of device, a device using a light source of a projector has been proposed (see, for example, Patent Document 1). The screen image disclosed in Patent Document 1 has been approved! Wow! According to the method and apparatus for preventing duplication (hereinafter referred to as “prior art”), a scanning sequence in which colored bars and stripes are randomly selected in a video screen image by a light source. And projected at the scanning speed. For this reason, it is considered difficult or impossible to comfortably view the recorded / reproduced image.

[0003] It is to be noted that there has also been proposed a technique for preventing illegal shooting of a digital moving image by a copy protection illumination system that illuminates a spatial light modulator (see, for example, Patent Document 2 or 3).

[0004] Further, a technique has been proposed in which an image captured by an imaging recording apparatus is obstructed by an image projection screen on which a fringe pattern that cannot be detected by humans is drawn (see, for example, Patent Document 4).

[0005] Patent Document 1: Japanese Translation of Special Publication 2005—513582

Patent Document 2: Japanese Unexamined Patent Application Publication No. 2004-295098

Patent Document 3: Japanese Patent Application Laid-Open No. 2004-234007

Patent Document 4: Japanese Unexamined Patent Application Publication No. 2004-333562

Disclosure of the invention

Problems to be solved by the invention

[0006] When illegal recording is prevented by using a light source or a projector of a projector, a relatively large capital investment is required. Similarly, when a screen for projecting video is used, the cost is increased, and the sound supplied through the screen can be affected, so that the quality of the video can be degraded. In other words, the conventional technology is economical and Another technical problem is that it is difficult to efficiently prevent illegal recording of video content.

[0007] The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a recording prevention apparatus and method capable of preventing illegal recording of video content economically and efficiently. To do.

Means for solving the problem

[0008] <Recording prevention device>

In order to solve the above problems, a recording prevention apparatus according to the present invention is a recording prevention apparatus for preventing recording of video content in a projection space provided with a screen for projecting video content. At least one light source that emits invisible light having a wavelength; and (ii) the irradiation characteristics of the invisible light when the invisible light is irradiated onto the projection space and (ii) the projection space is irradiated with time. And a control means for controlling the light source so as to be changed.

[0009] In the present invention, "video content" is a concept that encompasses content that can be displayed on a screen, regardless of the presence or absence of audio information, and typically refers to a movie. The “projection space” according to the present invention is a concept that includes at least a screen and includes a space for projecting video content on the screen. Therefore, the projection space typically refers to a movie theater or theater, but in view of the fact that a movie preview can be held in a hall, classroom or multipurpose space, a screen is installed. Alternatively, a space in which video content can be projected by installing a projector, a speaker, or the like may be a “projection space” according to the present invention.

[0010] The recording preventing apparatus of the present invention includes a light source. Here, the “light source” according to the present invention is configured to be capable of emitting invisible light, unlike a projection light source such as a white light source used to project video content on a screen. Refers to the light source. The form of the light source is not limited as long as non-visible light can be emitted, and may be a single wavelength light source or a multi-wavelength light source. Further, the number of light sources is not limited at all. Furthermore, when there are a plurality of light sources, at least some of the plurality of light sources may have different configurations. For example, a single wavelength light source and a multi-wavelength light source may be mixed, or a plurality of single wavelength light sources may be mixed. At least some of the wavelengths corresponding to one wavelength light source or a plurality of multiple wavelength light sources may be different from each other.

Here, “invisible light” according to the present invention is a concept encompassing light that cannot be sensed by human eyes. For example, light in the ultraviolet region (hereinafter referred to as “ultraviolet light” as appropriate). ) Or light in the infrared region (hereinafter referred to as “infrared light” where appropriate). The invisible light according to the present invention is a concept equivalent to light other than visible light. The visible light wavelength range is approximately 400ηπ! ~ 800nm Force Strictly speaking, there are individual differences and not necessarily defined as a clear wavelength range. Therefore, the wavelength range of invisible light according to the present invention does not necessarily have to be strictly defined.

[0012] According to the recording preventing apparatus of the present invention, during the operation, the light source is controlled by the control means so that the invisible light is irradiated onto the projection space.

[0013] Here, "irradiated to the projection space" means a malicious third party with the intention of illegally recording video content or a malicious third party without such intention (hereinafter referred to as appropriate). As long as non-visible light is interposed between the screen (hereinafter referred to as “third-party recording device”) and the screen owned by the “third party”), and the screen, the invisible light irradiation range However, this is not necessarily limited to the screen. However, since the relative position of the third party relative to the screen is often unknown, the irradiation range of invisible light is described later regardless of the position of the third party, such as on the screen, around the screen, or the entire projection space. It is preferable to set so that the effect according to the recording prevention apparatus of the present invention can be secured.

Here, the third-party recording device to which the recording prevention device of the present invention is intended to prevent unauthorized recording acts refers to a device in which the wavelength band of recordable light is at least wider than the visible region. That is, it preferably refers to a digital video camera, a digital camera, a mobile phone with a photographing function, or the like having a CCD (Charge Coupled Device) as an image sensor. In this case, the wavelength of the invisible light to be emitted from the light source should be determined according to the sensitivity characteristic of the CCD concerned, and in view of the general CCD sensitivity characteristic that the sensitivity decreases as the visible region power goes away. Among the non-visible regions, it is preferable to set the ultraviolet or infrared region near visible light.

[0015] Since the non-visible light irradiated to the projection space by the control means is non-visible light, Of course, it is not visually recognized by viewers who normally view video content (hereinafter referred to as “projected content” as appropriate). On the other hand, on video content recorded by a third-party recording device (hereinafter referred to as “recorded content” as appropriate), it appears as some kind of light trajectory unrelated to the irradiated invisible light-powered content. In particular, when invisible light is irradiated on the screen, the invisible light appears as a light spot having a shape corresponding to the size of the light source and the positional relationship between the light source and the screen. For example, when invisible light is irradiated perpendicularly to the screen by a light source, a light spot having a diameter larger than the diameter of the light source appears. In addition, when invisible light is irradiated with an oblique downward force on the screen, if the light source irradiates invisible light as diffused light, the light spot has a smaller width and brightness as the distance from the light source is closer. The width increases and the brightness decreases as the distance of the light source power increases. Also, if the non-visible light emitted from the light source is neither diffuse nor convergent light, the brightness will not change according to the distance of the light source.

[0016] The brightness of the light spot varies depending on the output of the invisible light depending on the output of the invisible light. However, at least the appearance position of the light spot (typically, the irradiation position of the invisible light) Visibility deteriorates because it reduces the gradation of the video content, such as color, shading or brightness. In addition, if the lens aperture adjustment in a third-party recording device is performed automatically, it is possible to irradiate non-visible light so that it is brighter than the brightest part on the projected content. It is also possible to increase the contrast, degrade the halftone expression in the recorded content, and reduce the visibility of the entire recorded content.

[0017] On the other hand, if the lens focus adjustment in a third-party recording apparatus is performed automatically (that is, provided with an autofocus function), the invisible light should be limited on the screen. It is also possible to interfere with focus control by irradiating the projection space three-dimensionally. By obstructing focus control in this way, the visibility of the entire recorded content can be significantly reduced.

[0018] Here, in particular, the recording action itself by a third party may be hindered by the fact that invisible light is recorded as a light spot or the like on the recorded content, but the recorded content itself is always unusable. Must not. For example, the entire screen is uniformly irradiated with invisible light. In this case, it is possible to obtain recorded content that is equivalent to or close to the projected content by secondary correction processing such as gamma correction. In other words, the invisible light that is irradiated may be removed as uniform noise in some cases.

[0019] Therefore, in the recording preventing apparatus of the present invention, the light source is controlled by the control means so that the irradiation characteristic of the invisible light when the projection space is irradiated is accompanied by a change with time.

[0020] Here, the "irradiation characteristics" is a concept that includes elements that can affect the viewing of recorded content in non-visible light irradiated to the projection space and that can change with time. As long as it is done, the aspect is not limited at all. “Change over time” is a change that occurs with the passage of time, but it is not always necessary to keep the change for the entire invisible light irradiation period. Thus, it is intended to include a state in which the irradiation characteristics can be regarded as changing. In addition, the amount of change, the rate of change, or the frequency of change in irradiation characteristics when a change with time is given is not particularly limited as long as a change with time can be finally given to the irradiation characteristics.

[0021] For example, such a change amount, change speed, change frequency, or the like may be set in advance as one or a plurality of patterns that can change the irradiation characteristics over time. In this case, the pattern may be set in advance so that the visibility of the recorded content can be effectively reduced experimentally, empirically, or based on simulation. In addition, the amount of change, the rate of change, or the frequency of change may be determined as appropriate based on some algorithm by a control means or some arithmetic means independent of the control means. Alternatively, the amount of change, change speed, or change frequency may be determined based on externally input instruction information.

Note that “controlling the light source” means, for example, the irradiation direction, irradiation angle, or irradiation position of the invisible light from the light source as long as a change with time is finally given to the irradiation characteristics of the invisible light. This concept includes aspects such as controlling the light source indirectly, such as controlling the drive system such as an actuator for controlling the power source, controlling the power supply source that supplies power to the light source, or driving the shield covering the light source. .

[0023] By controlling the light source so that the irradiation characteristic is accompanied by a change with time, non-visible light is recorded as a non-uniform locus (or pattern) on the recording content. Obedience Therefore, it is extremely difficult to eliminate the influence of invisible light by secondary correction such as gamma correction after recording the projection content, and it is possible to reliably prevent illegal recording of video content. .

[0024] On the other hand, the viewpoint power for reducing the image quality by irradiation with invisible light is expected to have an effect of further reducing the visibility of the recorded content due to a change over time given to the irradiation characteristics. For example, when invisible light is constantly scanned on the screen, the visibility is likely to be lower than when the invisible light is irradiated to a fixed position. Furthermore, the concentration of viewers tends to decrease. Accordingly, the video quality of the recorded content can be deteriorated to such an extent that it cannot be viewed.

[0025] Thus, according to the recording apparatus of the present invention, the video quality of the recording content can be significantly deteriorated by the action of the control means, and it can be difficult to correct it after recording. This makes it impossible to record and prevents unauthorized recording. In addition, since the irradiation characteristic that can give a change with time is not limited to one, it is possible to easily prevent unauthorized recording to a higher degree by a plurality of irradiation characteristics accompanied with a change with time. . On the other hand, from the viewpoint of the device configuration, the recording prevention device of the present invention can adopt a completely independent configuration with respect to an existing projection system for projecting video content on a screen, and has extremely high installation efficiency. Excellent economic efficiency. That is, according to the recording preventing apparatus of the present invention, it is possible to prevent illegal recording of video content economically and efficiently.

[0026] In view of the fact that the recording preventing apparatus of the present invention is configured with completely independent forces such as a projection system and a screen, the recording of the present invention is performed when the light source is configured on a scale that is portable. The prevention device can also be portable. Therefore, even when the video content is projected in a projection space having a multipurpose use such as a preview, unauthorized recording can be easily and reliably prevented.

[0027] When the recording device of a third party has a night vision photographing function for irradiating a recording target with infrared light of a specific wavelength and recording projection content based on the reflected light, the infrared of the specific wavelength is Filtering is performed in advance so as not to appear on the recorded content. In this case, if the wavelength of the light source according to the present invention is a single wavelength and a wavelength in the vicinity of the specific wavelength, the effect of preventing illegal recording as described above may be hindered. In view of these circumstances Thus, it is desirable that the light source of the present invention has at least two or more wavelengths as a whole light source. In this case, the control means may further control the light source so that the wavelength is appropriately switched during the invisible light irradiation period, or at the same time, the invisible light having a plurality of wavelengths is irradiated. In addition, when a plurality of light sources are provided, a plurality of control means are provided in one-to-one correspondence with each light source! /, But at least a part of the plurality of light sources is configured in common! That ’s right.

[0028] In one aspect of the recording preventing apparatus of the present invention, the control means includes the light source so that the irradiation characteristic is not regular in at least a part of the irradiation period of the invisible light. To control.

[0029] According to this aspect, since the light source is controlled so that the irradiation characteristic is accompanied by a temporal change that does not have regularity for at least a part of the irradiation period of the invisible light, unauthorized recording of the video content is further prevented. It can be effectively prevented.

[0030] Here, the "time-dependent change without regularity" is not limited to the case where the irradiation characteristics change at random with respect to time. For example, when multiple time-varying patterns fixed in advance for each unit time are prepared, one time-varying pattern is randomly extracted from the time-varying pattern according to the passage of time and connected. In other words, it may be a change with time having pseudo irregularity.

In one aspect of the recording preventing apparatus of the present invention, the irradiation characteristic includes at least one of the irradiation position of the invisible light and the brightness of the invisible light at the irradiation position.

[0032] According to this aspect, since the irradiation characteristic includes at least one of the irradiation position of the invisible light and the brightness of the invisible light at the irradiation position, the visibility of the recorded content is effectively reduced, It is possible to effectively prevent illegal recording of video content.

[0033] Here, the irradiation position is accompanied by a change with time, for example, in various directions such as a vertical direction, a horizontal direction, a diagonal direction, a rotating direction, a completely random direction, or a direction in which they are combined with each other. This means that the irradiation position changes. At this time, the speed at which the change over time, that is, the speed at which the irradiation position is moved and the frequency at which the irradiation position is moved is not limited at all, and the recorded content is viewed in advance experimentally, empirically, or based on simulation. A secondary after recording that humans feel uncomfortable, more preferably It may be set in such a manner that it becomes difficult to remove the influence of non-visible light by a general correction.

[0034] Such a change in the irradiation position with time is mainly given by moving the light-emitting surface portion of the invisible light in the light source physically, electrically, mechanically or mechanically. In this case, the control means may be, for example, a controller that controls the driving means such as a hydraulic actuator provided in the light source at a higher level. It ’s a drive system that ’s tailor-made.

On the other hand, the method of changing the brightness of the invisible light at the irradiation position is not uniquely defined. For example, the brightness of the invisible light caused by one light source may be changed by increasing / decreasing the output of each light source, or when the recording prevention device includes a plurality of light sources, The brightness may be changed by appropriately overlapping the irradiation positions related to the plurality of light sources without changing the output. In the latter case, it can be realized by controlling the irradiation position as described above. Here, the brightness at the irradiation position is accompanied by a change with time, that is, invisible light blinks. However, the manner of blinking is not limited to one, and it may be a binary blink corresponding to turning on / off of the light source, or may be an aspect in which the brightness is changed in multiple steps or seamlessly. Furthermore, the change rate of brightness when blinking is not limited.

[0036] It should be noted that the irradiation characteristics that accompany changes over time may include, for example, an irradiation pattern in addition to the irradiation position and brightness. The irradiation pattern is a planar shape of invisible light at the irradiation position, and may take various forms such as a figure, a number, a geometric pattern, a mark, or a character. Such an irradiation pattern may be formed by adding a shielding plate or a shielding film according to the irradiation pattern to each light source, and appropriately combining invisible light having different or equal brightness at the irradiation position. It may be formed by.

In another aspect of the recording preventing apparatus of the present invention, the predetermined type of control information for controlling the light source is applied to at least one temporal change pattern so that the temporal change is given to the irradiation characteristics. Then, a storage means for storing and a small number of the time-varying patterns. Selecting means for selecting at least one, and the control means controls the light source based on the control information corresponding to the at least one selected.

[0038] Here, "storage means" means non-volatile memory such as ROM (Read Only Memory), RAM

Various forms such as a volatile memory such as (Random Access Memory) or a rewritable storage device such as FD or HD (Hard Disk) can be adopted, and the control information is not limited as long as it can be stored.

[0039] The "predetermined type of control information" is a concept that includes information that can change the irradiation characteristics of invisible light over time. For example, the output range of the light source, the output switching speed, the movable range And a control value that defines a movable direction or a movable speed.

For example, when the output range of the light source is given as the control information, the control means changes the output of the light source in the range of the upper limit value and the lower limit value that define the output range. Furthermore, if the switching speed is given as control information, the output of the light source will change at the specified speed. That is, in this case, a change with time is given to the brightness of the invisible light at least at the irradiation position.

[0041] If the movable range and the movable direction of the light source are given as control information, the control means changes the emission direction of the invisible light in the designated range to the designated direction. That is, in this case, at least the irradiation position of the invisible light is changed with time.

[0042] Such control information is stored for at least one temporal change pattern. Here, the “time-varying pattern” is a pattern indicating the type of irradiation characteristics to which time-dependent changes should be applied and the qualitative scale of time-dependent changes. For example, the irradiation characteristics are “brightness”. The time-dependent change pattern having a large scale means a change over time such that the brightness of invisible light changes within a relatively large range. Incidentally, such time-varying pattern corresponds to control information in which the output range is set to be relatively large. Such a time-varying pattern and the corresponding control information are set in advance as experimentally, empirically, or based on simulation, etc., so as to effectively reduce the visibility of the recorded content. Also good.

On the other hand, the selection means selects at least one from such a temporal change pattern. At this time, the criterion for selecting the temporal change pattern is not particularly limited. For example, A time-varying pattern may be selected according to the clean brightness. In this case, for example, when the screen is relatively bright (for example, video content with many bright scenes), a time-varying pattern that makes the irradiated invisible light relatively bright may be selected. On the other hand, if the screen is relatively dark (for example, video content with many dark scenes), the non-visible light will become dark as long as the visibility of the video content can be reduced with emphasis on economy. A time course pattern may be selected. Alternatively, the content of the video content may be prayed using a known image recognition technology, pattern recognition technology, face recognition technology, or the like, and a time-varying pattern corresponding to the content of the video content may be selected.

[0044] For example, in the case of video content, when it is estimated that the main appearance material is not relatively dynamic near the center of the screen, a temporal change pattern is selected so that invisible light is relatively concentrated near the center of the screen. May be. In addition, when the video content is estimated to be relatively intense and V, an action-related video content, etc., a time-varying pattern is selected so that the irradiation position of invisible light changes relatively intensely. Anyway.

[0045] It should be noted that the content or feature of such video content is, for example, if the video content is digital content recorded as digital data at the projection stage, in relation to the video content in real time before or at the start of projection. It may be acquired as image control data. In this case, based on the acquired image control data, the most suitable time change pattern may be selected from the stored time change patterns.

[0046] According to this aspect, since the control unit controls the light source based on the control information corresponding to the selected temporal change pattern, the visibility of the recorded content is effectively reduced. However, it is preferable because the load on the control means can be reduced.

[0047] In this aspect, the information processing apparatus further includes input means for inputting the time-dependent change pattern to be selected, and the selection means is the intermediate force of the at least one time-change pattern. A pattern may be selected.

Here, the “input means” may take various forms such as a keyboard, a mouse, a trackball, a touch pad, an operation button, an operation lever, or an operation dial. In this case, the user using the recording prevention apparatus can select a desired time-varying pattern via the input means. The selection unit displays the user's selection result via the input unit, for example, As a result, a time-varying pattern reflecting the user's intention is realized. Therefore, the convenience of the recording preventing apparatus can be remarkably improved.

[0049] In another aspect of the recording preventing apparatus of the present invention, the projection space further includes a seat installed relative to the screen, and at least a part of the light source is installed in the seat.

[0050] According to this aspect, since at least a part of the light source is installed in the seat provided in the projection space, it is economical and efficient. For example, in a movie theater or a theater, it may be difficult to secure a sufficient space for installing a light source around the screen. On the other hand, the ability to effectively reduce the video quality of recorded content is required to ensure that invisible light can be securely contained in the recording area when a third party points the recording device at the screen to be recorded. is there. Thus, when at least a part of the light source is installed in the seat, space efficiency can be improved and illegal recording of video content can be effectively prevented.

[0051] <Recording prevention method>

In order to solve the above problems, the recording prevention method of the present invention includes at least one light source that emits non-visible light having at least one wavelength in a projection space including a screen for projecting video content. A recording prevention method for use in preventing recording of the video content, comprising: (i) irradiating the invisible light to the projection space; and (ii) irradiating the projection space with the invisible light. A control step of controlling the light source so that the irradiation characteristics are changed with time;

[0052] According to the recording prevention method of the present invention, the same operational effects as those of the recording prevention device of the present invention can be realized by the steps corresponding to the respective means related to the above-described recording prevention device of the present invention.

As described above, since the recording preventing apparatus of the present invention includes the light source and the control means, it is possible to economically and efficiently prevent illegal recording of video content.

[0054] As described above, the recording prevention method of the present invention includes a control step, and therefore it is possible to economically and efficiently prevent illegal recording of video content.

[0055] These effects and other advantages of the present invention will become apparent from the embodiments described below.

Brief Description of Drawings FIG. 1 is a schematic diagram of a projection space according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a recording prevention apparatus installed in the projection space of FIG.

3 is a conceptual diagram of the operation of the recording prevention device of FIG.

FIG. 4 is a schematic diagram of infrared laser light in which a change with time is given to the irradiation characteristics in the operation example of the recording preventing apparatus of FIG.

FIG. 5 is another schematic diagram of an infrared laser beam in which a change with time is given to the irradiation characteristics in the operation example of the recording preventing apparatus of FIG. 2.

FIG. 6 is a conceptual diagram of installation of a recording preventing apparatus according to a second embodiment of the present invention.

FIG. 7 is a conceptual diagram of the operation of the recording preventing apparatus according to the second embodiment of the present invention.

FIG. 8 is a conceptual diagram of installation of a recording preventing apparatus according to a third embodiment of the present invention.

Explanation of symbols

[0057] 10 ··· projection space, 11 · · · screen, 12 · · · movie, 13 · · · third party, 14 · · · recording device, 15 · · · seat, 100 · · · recording prevention device, 110 DESCRIPTION OF SYMBOLS ... Light source, 111 ... Irradiation part, 112 ... Drive part, 113 ... Power supply part, 120 ... Control device, 121 ... Control part, 122 ... Storage part, 123 ... Input part.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described in each embodiment in order with reference to the drawings.

[0059] <First embodiment>

First, with reference to FIG. 1, an installation mode of the recording preventing apparatus according to the first embodiment of the present invention will be described. Here, FIG. 1 is a schematic diagram of the projection space 10.

In FIG. 1, a projection space 10 is a space provided with a screen 11 and a seat 15, and the screen 11 is a movie that is an example of “video content” according to the present invention via a projection system (not shown). 12 are projected. On the other hand, a third party 13 who intends to illegally record the movie 12 is seated on a part of the seat 15, and the recording device 14 owned by the third party 13 performs an illegal recording act of the movie 12. The recording device 14 is a digital video talent having a CCD as an image sensor.

[0061] On the other hand, in the projection space 10, in order to prevent illegal recording by the third party 13, An anti-recording device 100 is installed. The recording prevention device 100 includes a plurality of light sources 110 arranged around the screen 11 and a control device 120 that controls the plurality of light sources 110.

Next, the detailed configuration of the recording preventing apparatus 100 will be described with reference to FIG. FIG. 2 is a block diagram of the recording prevention apparatus 100. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In FIG. 2, the recording preventing apparatus 100 includes a light source 110 and a control device 120. Note that in the recording prevention apparatus 100, the plurality of light sources 110 have the same hardware configuration. In FIG. 2, for the sake of simplicity of explanation, the explanation of one light source 110 explains the other light sources 110. Shall be performed simultaneously.

[0064] The light source 110 includes an irradiation unit 111, a drive unit 112, and a power supply unit 113, and is configured to be able to irradiate the projection space 10 with infrared laser light as an example of "invisible light" according to the present invention. It is an example of a “light source” according to the present invention.

The irradiation unit 111 is configured to be able to emit infrared laser light having a wavelength of 850 nm.

[0066] The drive unit 112 is a drive mechanism for controlling the irradiation position of the infrared laser light emitted from the light source 110, and is a three-dimensionally rotatable pedestal partially fixed to the irradiation unit. And an actuator system (both not shown) for driving the part and the pedestal part. The irradiation position of the infrared laser light emitted from the light source 110 in the projection space 10 is variably controlled by the action of the driving unit 112. However, the light source 110 is installed in advance so that infrared laser light is evenly distributed on the screen at the default irradiation position.

The power supply unit 113 is configured to be able to supply electric power as a power source to the driving unit 112 and the irradiation unit 111, respectively.

The control device 120 includes a control unit 121, a storage unit 122, and an input unit 123.

[0069] The control unit 121 is a processing unit that controls the entire operation of the recording prevention apparatus 100, including a CPU (Central Processing Unit), and functions as an example of "control means" and "selection means" according to the present invention. Is configured to do. The control unit 121 is electrically connected to the drive unit 112 and the power supply unit 113 of the light source 110, respectively, and an infrared laser beam emitted from the light source 110. The irradiation characteristics are all controlled according to the control signal supplied from the control unit 121.

The storage unit 122 is a storage device having a nonvolatile storage area, and is an example of the “storage unit” according to the present invention. The storage unit 122 stores a basic control program for controlling the recording prevention device 100 and control information for controlling the irradiation characteristics of the infrared laser light emitted from the light source 110. A plurality of such control information is set in advance in association with a plurality of time-varying patterns set in accordance with a plurality of irradiation characteristics of the infrared laser light, and the infrared laser light emitted from the light source 110 is Control is based on control information corresponding to the selected temporal change pattern, and the projection space 10 is irradiated with the temporal change defined by the selected temporal change pattern.

The input unit 123 is an example of the “input unit” according to the present invention configured to include a keyboard device (not shown). The recording preventing apparatus 100 is configured such that the above-described temporal change pattern that defines the temporal change to be imparted to the irradiation characteristics of the infrared laser light can be appropriately selected by an input operation via the input unit 123. ing.

Next, the operation of the recording prevention apparatus 100 will be described with reference to the drawings as appropriate.

First, the operation concept of the recording preventing apparatus 100 will be described with reference to FIG. FIG. 3 is a conceptual diagram of the illegal recording preventing operation by the recording preventing apparatus 100. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In FIG. 3, the infrared laser beam 114 is irradiated to the screen 11 from the plurality of light sources 110 arranged around the screen 11. Since the infrared laser beam 114 is light in a non-visible region, the viewer's ability to normally view the movie 12 projected on the screen 11 through the sight is not visually recognized. On the other hand, the recording device 14 owned by the third party 13 has a CCD as an imaging element, and its sensitivity range is wider than that of human vision, that is, partially in the ultraviolet region and infrared region. Has spread. Accordingly, when the screen 12 is imaged via the recording device 14, the infrared laser beam 114 is displayed in an overlapping manner on the movie 12 as shown in the drawing, and as described above, the aperture control of the recording device 14 is hindered. As a result, the recorded movie The visibility of 12 is significantly reduced.

[0075] On the other hand, as described above, when the irradiation characteristics of the infrared laser light 114 irradiated on the screen 11 from each light source have regularity, recording is performed by software correction processing by the third party 13. The influence of the infrared laser beam 114 may be eliminated even in the upper power of the movie 12 made. Therefore, in the recording prevention device 100, the control device 120 gives a change with time to the irradiation characteristics of the infrared laser beam 114! Speak.

In this embodiment, a time-varying pattern that preliminarily defines a time-dependent change to be given to the irradiation characteristics is selected for each light source 110 by the operation of the input unit 123 by the user of the recording preventing apparatus 100. Shall be.

More specifically, a time-varying pattern for blinking infrared laser light is selected as one of the time-varying patterns for imparting the time-varying brightness (that is, one of the irradiation characteristics). ing. In addition, as one of the temporal change patterns for imparting the temporal change to the irradiation position (that is, one of the irradiation characteristics), the temporal change pattern for scanning the infrared laser light on the screen 11 is selected.

The storage unit 122 stores an upper limit value and a lower limit value of the output of the infrared laser light and a blinking cycle value as control information corresponding to the former, and the control unit 121 is associated with the storage unit 122. The control information is read and a control signal is supplied to the power supply unit 113. In addition, the storage unit 122 stores, as control information corresponding to the latter, a change amount of the irradiation position of the infrared laser light with respect to the elapsed time from the reference time, and the control unit 121 controls the control from the storage unit 122. Information is read and a control signal is supplied to the driving unit 112.

Here, with reference to FIG. 4, a change with time in the irradiation characteristics of the infrared laser beam 114 will be described. Here, FIG. 4 is a schematic diagram of an infrared laser beam in which a change with time is given to the irradiation characteristics. In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In FIG. 4, an infrared laser beam 115 represents an infrared laser beam controlled to blink. That is, the infrared laser light 115 is an example of non-visible light whose brightness is controlled so as to change with time. At this time, the power supply unit 113 similarly defines the control information between the upper limit value and the lower limit value specified by the control information described above in accordance with the control signal described above. Electric power is supplied to the irradiation unit 111 so that the infrared laser beam is irradiated from the irradiation unit 111 at a blinking period.

In FIG. 4, infrared laser beams 116 and 117 represent infrared laser beams that are controlled so that the irradiation position changes. That is, the infrared laser beams 116 and 117 are an example of invisible light whose irradiation position is controlled so as to change with time. At this time, the drive unit 112 three-dimensionally drives the irradiation unit 111 so that the irradiation position is accompanied by the change defined by the control information described above with respect to the elapsed time from the reference time according to the control signal described above. To do. For example, the infrared laser beam 116 is an infrared laser beam whose irradiation position is controlled so as to scan the screen 11 left and right at a constant or indefinite period, and the infrared laser beam 117 moves up and down on the screen 11. This is an infrared laser beam whose irradiation position is controlled so as to scan in the direction at a constant or indefinite period.

Next, another mode for controlling the brightness of the infrared laser light will be described with reference to FIG. FIG. 5 is another schematic diagram of the irradiated infrared laser beam. In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In FIG. 5, an infrared laser beam 118 whose brightness is lower than that of the infrared laser beam 114 is emitted from some of the light sources 110. The irradiation position of this infrared laser beam 118 is controlled so that all overlap each other near the center of the screen 11, and the brightness at this overlapping position (see A in the figure) is equivalent to that of the infrared laser beam 114. It has become. On the other hand, in the irradiation position (see B in the figure) where a part of the infrared laser beam 118 overlaps, the brightness is darker than the infrared laser beam 114 and brighter than the infrared laser beam 118. As described above, the brightness of the infrared laser light at the irradiation position is determined by simply irradiating the infrared laser light from a plurality of light sources, which is achieved by simply controlling the output of the single light source via the power supply unit 113. It can also be controlled by overlapping the positions. In this case, even the power of one light source is economical because the power required to irradiate infrared laser light is relatively small.

[0084] As described above, according to the recording preventing apparatus 100 according to the present embodiment, the control unit 121 controls each light source so that the irradiation characteristics of the infrared laser light are changed with time. The visibility of the recorded video content is significantly reduced and it is not easy to eliminate the influence of infrared laser light. In other words, illegally recorded content is virtually unusable As a result, illegal recording can be efficiently prevented. Furthermore, as long as each light source can irradiate the projection space with infrared laser light, it can be placed inside and outside the projection space independently of the screen and projection system, which is economical. .

[0085] <Second embodiment>

Next, a recording preventing apparatus according to the second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a conceptual diagram of installation of the recording preventing apparatus 200. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In FIG. 6, the recording preventing apparatus 200 is different from the recording preventing apparatus 100 according to the first embodiment in that it includes a light source 210 instead of the light source 110.

The light source 210 is detachably fixed to the upper portion of the backrest of the seat 15, and the emission direction of the infrared laser light from the irradiation unit is set to the entire projection space 10 including the screen 11.

Here, the operation of the recording preventing apparatus 200 will be described with reference to FIG. FIG. 7 is a conceptual diagram of the operation of the recording preventing apparatus 200. In the figure, the same parts as those in FIG. 6 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In FIG. 7, the irradiation position of the infrared laser beam 211 emitted from the light source 210 is not limited to the screen 11, but covers the entire projection space 10, and the irradiation characteristic is higher than that in the first embodiment. It is possible to give more complicated changes with time.

[0090] <Third embodiment>

In the above embodiment, the wavelengths of the infrared laser beams emitted from the plurality of light sources 110 are the same, but the recording device that illegally records the video content has a night-vision shooting function using infrared rays. If the infrared light and the wavelength band of the light source of the recording prevention device overlap, the above-described illegal recording prevention effect may be hindered by the filtering on the recording device side.

A third embodiment of the present invention that can cope with such a situation will be described with reference to FIG. FIG. 8 is a conceptual diagram of installation of the recording preventing apparatus 300 according to the third embodiment of the present invention. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. In FIG. 8, the recording preventing apparatus 300 includes a plurality of light sources 110, 310, and 320 as light sources. That is, it is different from the recording preventing apparatus 100 in that a part of the light source 110 is replaced with the light sources 310 and 320.

[0093] The light sources 310 and 320 are light sources configured to emit infrared laser light having wavelengths of 950 nm and 1050 nm, respectively. During the operation, the drive unit 112 and the power supply unit 113 are driven by the control operation of the control unit 121 described above. However, since the infrared laser light irradiated on the screen 11 has all three types of wavelengths, recording is performed. Even if an infrared laser beam having a wavelength in the same band as one of these wavelengths is filtered out by the device 14, the image quality can be reliably reduced by the remaining two-wavelength infrared laser beams. Is possible.

Note that the brightness of the infrared laser light represents the brightness in consideration of the sensitivity characteristic of the CCD of the recording device 14 owned by the third party 13 that is not based on the luminance concept based on human visual sensitivity. In other words, even if the brightness of the infrared laser light changes, it has no effect on general viewers who normally view the movie 12 visually. On the other hand, the sensitivity of the CCD decreases in the infrared region as the wavelength increases, so when multiple infrared laser beams with different wavelengths are irradiated to the projection space 10 with the same output, The brightness inevitably becomes relatively dark in long-wavelength infrared laser light (ie, 1050 nm). That is, the brightness power represented by one temporal change pattern changes for each light source. In order to prevent such a situation, the control information stored in the storage unit 122 is preliminarily generalized so that the brightness defined by one time-varying pattern is substantially equal for any light source. Corrected based on the sensitivity characteristics of the CCD.

[0095] The present invention is not limited to the above-described embodiments, but can be changed as appropriate without departing from the gist or concept of the invention which can be read, and recording prevention accompanied with such changes. Devices and methods are also within the scope of the present invention.

Industrial applicability

The recording preventing apparatus and method according to the present invention can be used for a recording preventing apparatus for preventing illegal recording of video content such as a movie, for example.

Claims

The scope of the claims

[1] A recording prevention device for preventing recording of the video content in a projection space provided with a screen for projecting video content,

At least one light source that emits invisible light having at least one wavelength; and ω the invisible light is applied to the projection space, and (i) the irradiation characteristics of the invisible light when the projection space is applied. And a control means for controlling the light source so as to change with time.

An anti-recording device comprising:

[2] The control means controls the light source so that the irradiation characteristic is not regular for at least a part of the irradiation period of the invisible light, and is accompanied by a change with time.

The recording preventing apparatus according to claim 1, wherein

[3] The irradiation characteristic includes at least one of an irradiation position of the non-visible light and a brightness of the non-visible light at the irradiation position.

The recording preventing apparatus according to claim 1, wherein

[4] Storage means for storing a predetermined type of control information for controlling the light source so that the temporal change is imparted to the irradiation characteristics for at least one temporal change pattern;

Selecting means for selecting at least one of the temporal change patterns;

Further comprising

The control means controls the light source based on the control information corresponding to the selected at least one.

The recording preventing apparatus according to claim 1, wherein

[5] The apparatus further comprises input means for inputting the time-varying pattern to be selected, and the selecting means selects the input time-varying pattern from the at least one time-varying pattern.

5. The recording preventing apparatus according to claim 4, wherein

[6] The projection space further comprises a seat installed relative to the screen,

At least a part of the light source is installed in the seat The recording preventing apparatus according to claim 1, wherein

A recording prevention method for preventing recording of video content using at least one light source that emits invisible light having at least one wavelength in a projection space including a screen for projecting video content,

ω includes a control step of controlling the light source so that the invisible light is irradiated onto the projection space, and (i) the irradiation characteristic of the invisible light when the projection space is irradiated is changed with time. A method for preventing recording.