WO2005125193A1 - Procede et systeme pour empecher de photographier certains objets - Google Patents

Procede et systeme pour empecher de photographier certains objets Download PDF

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Publication number
WO2005125193A1
WO2005125193A1 PCT/IL2005/000634 IL2005000634W WO2005125193A1 WO 2005125193 A1 WO2005125193 A1 WO 2005125193A1 IL 2005000634 W IL2005000634 W IL 2005000634W WO 2005125193 A1 WO2005125193 A1 WO 2005125193A1
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WO
WIPO (PCT)
Prior art keywords
radiation
interest
region
external
unit
Prior art date
Application number
PCT/IL2005/000634
Other languages
English (en)
Inventor
Sharon Ehrlich
Gilad Shenhar
Boaz Tadmor
Zipora Alster
Ehud Givon
Dror Pesso
Original Assignee
Camjam Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Camjam Ltd. filed Critical Camjam Ltd.
Publication of WO2005125193A1 publication Critical patent/WO2005125193A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91392—Television signal processing therefor for scrambling ; for copy protection using means for preventing making copies of projected video images

Definitions

  • This invention is generally in the field of security/privacy techniques, and relates to an optical method and system for preventing the photography of certain objects.
  • the camera photography indication is reported from the operation part to a control part and then reported from the control part to a camera part, which carries out photography.
  • the photography by the camera part is reported from the control part to a weak radio part, which sends a photographic signal through an antenna.
  • the weak radio part once receiving a photographic signal sent from another mobile telephone set through the antenna, sends its information to the control part.
  • the control part once informed of the photographic signal, drives a vibration part and a display part; and the vibration part vibrates and the display part makes a display showing that the different mobile telephone set is taking a photograph.
  • Japanese patent No. 2004328475 discloses photography prevention system capable of preventing photography with a mobile terminal device with camera at a photography prohibited place.
  • the photography prevention system performs control so that the mobile terminal device with camera cannot perform the photography by a camera part of the mobile terminal device with camera by allowing the mobile terminal device with camera to receive a signal of Bluetooth communication from a Bluetooth module provided in the vicinity of an object the photography of which is prohibited.
  • the known techniques provide only partial solutions for the photography disrupting problem. Indeed, the techniques utilizing blocking of the mobile phone activity in specific areas, while preventing transmission of data indicative of acquired images to an external source, do not prevent saving of this data (photographs) in the mobile phone memory. Moreover, this solution is irrelevant for other systems, such as micro digital cameras or micro computers, such as PDA and the like.
  • an apparatus and method for preventing a photographic image from being taken utilizes a triggering mechanism which will generate a signal when detecting a light signal indicative of a camera flash.
  • a flash unit is coupled to the triggering mechanism for generating a counteracting flash after receiving the signal generated by the triggering mechanism.
  • the present invention provides a novel optical solution for the above problem.
  • the invented technique allows for preventing the meaningful image capture by a camera (constituting an imaging device) from a region of interest without affecting the camera configuration and operation, and without a need to follow external instructions. This is achieved in the present invention by providing external radiation randomly varying in space and time, in the vicinity of a region of interest.
  • a method for preventing imaging of a region of interest comprising: providing external electromagnetic randomly varying in space and time in the vicinity of the region of interest, thereby randomly affecting at least one of the intensity and wavelength of a radiation pattern reaching a radiation sensitive element of an imaging device while collecting radiation from the region of interest.
  • the randomly varying radiation is provided by randomly varying deflection of the external radiation, and possibly also altering a rate of the radiation deflection.
  • the randomly varying deflection consists of randomly varying a trajectory of propagation of the external radiation in a three- dimensional space.
  • the external radiation includes radiation of different wavelength ranges.
  • the intensity and/or polarization of the external radiation may also be varied.
  • the generation of the randomly varying external radiation may be initiated in response to an external identification signal.
  • This may be implemented using one or more sensor devices accommodated in the vicinity of the region of interest and being responsive to a predetermined condition indicative of an external object approaching the region of interest.
  • the system configuration may be such that the randomly varying external radiation is directed towards the imaging device, and/or towards the region of interest.
  • one or more control radiation sensor is used. Such a sensor is appropriately accommodated to collect light from the region of interest and therefore test the quality of the image disruption.
  • such a sensor is configured to generate a warning signal in case the disruption is not achieved or is not sufficiently effective.
  • a system for use in preventing imaging of a region of interest comprising a source of external electromagnetic radiation and a radiation deflection unit, the system being configured and operable to provide the external radiation, randomly varying in space and time in the vicinity of the region of interest, thereby randomly affecting a radiation pattern reaching a radiation sensitive element of an imaging device while collecting radiation from the region of interest.
  • the radiation source unit includes several radiation sources generating radiation of different wavelengths.
  • the system may include one or more spectral filter.
  • the deflection unit may include a radiation scattering surface, and/or one or more reflector units.
  • the reflector unit preferably includes an array of micro- mirrors controllably movable to provide the randomly varying deflection.
  • the system includes at least one drive unit configured for displacing the radiation source unit and/or the deflection unit or at least part thereof.
  • the deflection unit may include at least one movable light modulator.
  • the light modulator may be driven for rotating and vibration during the rotation.
  • the light modulator may include a plurality of randomly distributed spaced-apart spectral filters.
  • the light modulator may be formed by a plurality of spaced- apart randomly shaped and distributed light transmitted regions spaced by relatively light blocking regions.
  • a device for projecting information on a plane in a region of interest comprising the above-described system for preventing capturing an image of the projected information by any imaging device.
  • an object carrying the above-described system for preventing capturing an image of the object by any imaging device is provided.
  • Fig. 1 is a block diagram of a system of the present invention for preventing the photography of a region of interest by disrupting the image of the l o region of interest
  • Fig. 2 is a schematic illustration of an example of the implementation of the system of Fig. 1
  • Fig. 3 exemplifies various alternatives suitable for use in the invention for activating the system
  • 15 Fig. 1 is a block diagram of a system of the present invention for preventing the photography of a region of interest by disrupting the image of the l o region of interest
  • Fig. 2 is a schematic illustration of an example of the implementation of the system of Fig. 1
  • Fig. 3 exemplifies various alternatives suitable for use in the invention for activating the system
  • FIG. 4 shows another example of the implementation of the system of the present invention utilizing a deflection unit based on MEMS formed by digital micro mirror devices (DMD) and digital light processing (DLP);
  • Fig. 5 illustrates a system formed by a point-like light source, a mirror, and a camera, for explaining the operational principles of the present invention;
  • Fig. 6 exemplifies a system of the present invention configured to direct randomly varying external radiation towards an imaging device;
  • Figs. 7 and 8 show two examples, respectively, of a projection device utilizing the system of the present invention for preventing photography of a certain projected material or film;
  • FIG. 9 exemplifies the system of the present invention carried by an object for preventing imaging or identification of the object by an imaging device (e.g., biometric imaging); and
  • Fig. 10 illustrates schematically yet another example of an illumination system of the present invention.
  • DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Referring to Fig. 1, there is illustrated, by way of a block diagram, a system 1 of the present invention configured and operable for disrupting image data collected by a radiation sensitive element (not shown) of an imaging device 13 from a region of interest 11.
  • System 1 is configured as an illumination system, and includes such main constructional parts as a light source unit 14 and a light deflector 16.
  • System 1 is configured and operable such that electromagnetic radiation L produced by system 1 randomly varies in space and time. This can be achieved by appropriately (e.g., vibrating) moving the radiation source and/or the radiation deflector.
  • Radiation deflector 16 may include a radiation scattering surface, and/or one or more reflectors, and/or one or more light modulators; or may be constituted by a drive unit randomly displacing the light source unit.
  • the scattering and/or reflective surface may be constituted by walls surrounding the region of interest by providing an appropriate coating on the walls.
  • System 1 is accommodated in the vicinity of region of interest 11, and is arranged such that randomly deflected light L is directed towards imaging device 13, when the latter is oriented to collect light from region of interest 11.
  • the system of the present invention may be configured to directly propagate light onto the imaging device, rather than illuminating the region of interest (object) that is to be prevented from being photographed (imaged).
  • This can, for example, be achieved by accommodating the radiation source (and/or deflector) around the region of interest, such that any imaging device, while targeted on the region of interest, would collect light produced by the system of the invention. This configuration will be described below with reference to Fig. 6.
  • the system of the present invention is arranged with respect to the region of interest such that the randomly deflected light illuminates the region of interest, as will be described below with reference to Fig. 2.
  • the system of the present invention is configured for providing external electromagnetic radiation randomly varying in space (preferably along three axes) and time.
  • the intensity of a radiation pattern received by the light sensitive element of an imaging device when targeted to the region of interest, is randomly affected, thereby impending and practically making impossible the interpretation of this image data and thus the reconstruction of the image of an object in the region of interest.
  • the random deflection of radiation consists of randomly varying the trajectory of the radiation propagation, and may also include random variation of a rate of the radiation deflection. Additionally, the intensity and/or wavelengths and/or polarization of the external radiation may be randomly altered.
  • FIG. 2 schematically illustrates an illumination system, generally at 10, appropriately oriented with respect to a region of interest 11 and configured and operable as the image disruption system, aimed at preventing an object 12 located within region of interest 11 from being photographed by an imaging device (camera) 13.
  • the latter may be any independent digital camera, or digital camera integrated into a phone device, PDA, or a regular movie camera.
  • System 10 includes a light source unit 14, and a light deflection unit 16.
  • the light deflection unit is operable by a control unit 18 to randomly vary the trajectory of light propagating from light source unit 14 towards region of interest 11. As a result, light produced by system 10 randomly varies in space and time.
  • Light deflector unit 16 includes a light scattering surface 16A, which is oriented with respect to light source unit 14 so as to be in optical path of light 24 emanating from the light source unit. Scattering surface 16A is configured to randomly deflect light 24 impinging thereon in various directions. Such a scattering surface may be formed by a mirror with a granular coating. Light deflection unit 16 may also include one or more reflectors - one such reflector 16B being shown in the present example. Reflector 16B is appropriately accommodated with respect to surface 16A to reflect a part of deflected light 24' impinging thereon.
  • Light source unit 14 may include a single light source, e.g., a broadband light source, or a plurality of light sources. In the present example of Fig. 2, an array of ten such light sources is shown.
  • light generated by light source unit 14 is of various wavelength ranges (from UV to far IR range), which is achieved by using either one or more broadband sources, or a plurality of light sources each operating in a different wavelength range (e.g., an array of LEDs).
  • system 10 may be arranged such, that deflected light 24' is directed towards imaging device 13, when the latter is oriented to collect light from region of interest 11.
  • system 10 is arranged with respect to region of interest 11 such that deflected light 24' illuminates the region of interest (illuminates object 12).
  • either one of scattering surface 16A (and/or reflector 16B as the case may be) and light source unit 14, or both of them, are mounted for movement, e.g., vibration.
  • both the light source unit and the scattering surface are mounted for vibration.
  • a drive assembly 19 is provided having a first drive unit 19A associated with light source unit 14 and a second drive unit 19B associated with deflection unit 16 (with scattering surface 16A). The drive assembly is operated by control unit 18.
  • the drive unit may include a 3-axes mechanical displacement system for displacing the light source unit, and/or may include a light beam manipulator based on mirrors, lenses or fibers moved by galvanometers, piezo-electric actuators or micro electro mechanical systems (MEMS).
  • MEMS micro electro mechanical systems
  • control unit 18 operates to vary (randomly) a rate of the light deflection, namely the vibration rate of light source 14 and/or of deflection unit 16.
  • Control unit 18 is a computer system including inter alia a data processing and analyzing utility 20 and a movement controller 22.
  • movement controller 22 includes a first controller utility 22A for controlling the operation of drive unit 19A to move light source unit 14, and a second control utility 22B for controlling the operation of drive unit 19B to move scattering surface 16A.
  • the system of the present invention may be configured to provide radiation of various wavelengths and/or to vary the intensity of illuminating light.
  • control unit 18 may include an additional utility 26 associated with light source unit 14 and preprogrammed for controlling the intensity of light generated by the light source unit, and/or for selectively operating different light sources.
  • system 10 operates to produce light randomly varying in 3D space and time in the vicinity of region of interest 11. In the example of Fig. 2, system 10 operates to illuminate region of interest 11 with such randomly varying light.
  • the camera When someone takes a picture of object 12 located in region of interest 11 using camera 13, the camera operates in the conventional manner to collect light 28 reflected from object 12.
  • This light 28 includes the directly projected light 24 (randomly deflected due to the vibration of light source unit 14) and the scattered/reflected light 24' (randomly deflected due to the scattering from surface 16A and also due to vibration of this surface).
  • a light pattern incident onto a light sensitive surface (e.g., a pixel matrix) of camera 13 has a randomly varying intensity during the camera exposure time.
  • the search rate of the reflecting/scattering surfaces and of the light source unit is very high, as is the intensity of the illumination, so that even a very brief exposure will not enable contending with the disruption.
  • light source unit 14 is configured to generate light of long and short wavelengths (UV and IR) in case the cameras are fitted with spectral filters.
  • system 10 preferably includes a feedback control assembly 32.
  • Assembly 32 includes one or more light sensors, two such light sensors 34 being shown in the present example, appropriately accommodated with respect to region of interest 11.
  • the output of light sensor 34 is connectable to the processor of control unit 18.
  • Assembly 32 operates to test the quality of distortion of light source unit 14, and to provide a feedback signal to the processor utility, which tests the status of the distortion, and possibly operates light source unit 14 to intensify the illumination, and in case of particularly strong peripheral illumination, generates a warning signal.
  • AGC Systems Automatic Gain Control
  • generation of the randomly varying illumination for image disruption may also include the use of varying light polarization, and/or the use of a strong illumination lamp targeted (by the control unit) onto imaging device 13. It should be noted that the effectiveness of the image disruption can be improved due to reflectivity of surfaces within the outer space in the vicinity of region of interest 11, and/or the use of special external reflector(s) such as reflector 16B.
  • the permanent surfaces of the outer space could be painted (coated) by reflective/scattering materials to thereby significantly improve the image disruption efficiency.
  • the configuration may be such that system 10 is intended for continuous operation to produce randomly varying radiation, at least during certain time periods.
  • generation of the randomly varying external radiation is initiated in response to an external actuation signal, for example, being an identification signal generated by an external sensor system accommodated in the vicinity of the region of interest and responsive to a predetermined condition indicative of an external object approaching the region of interest.
  • an external actuation signal for example, being an identification signal generated by an external sensor system accommodated in the vicinity of the region of interest and responsive to a predetermined condition indicative of an external object approaching the region of interest.
  • Fig. 3 exemplifying various alternatives suitable for use in the system of the present invention for activating the system operation, in case such operational mode of the system is considered.
  • control unit 18 is provided with an additional activating processor utility 25.
  • Processor 25 is configured to be responsive to an external actuation signal to generate output data for operating a light source operator utility (26 in Fig. 2) and a movement controller (22 in Fig. 2).
  • Control unit 18 optionally includes a status display 27 whose input is connectable to the output of processor 25, and one or more communication port, generally at 29.
  • control unit 18 may be provided with an appropriate data input utility 40 for manually inputting the external actuation signal by an operator.
  • the system may be equipped with one or more sensors generating an external identification signal to be received by activating processor 25.
  • a proximity sensor 41 may be used that enables examination of the approach of different objects. This sensor may be magnetic, acoustic (e.g., ultrasonic), etc.
  • a motion sensor 42 may be used that enables identification of any motion in the vicinity of the region of interest. These sensors may include control cameras (imaging device), acoustic (ultra-sound) sensors and/or RF receivers 43, IR arrays 45, etc.
  • the system may include heat sensors 46 which enable another supplementary detection of robotic instruments, humans, animals, etc.
  • acoustic sensors 47 microphones of varying wavelengths, in the sound, ultrasound and infrasound ranges
  • Pressure sensors 48, and/or humidity sensors 49 and/or gas (smoke) sensors 50 may be used.
  • Other options include the use of magnetic and electrical field sensors 51, 52, as well as light sensors 45, 53 (including also a regular camera).
  • Such one or more sensors transmit its output to the control unit (to 5 activating processor 25).
  • Control unit 18 is preferably configured as the so- called "expert system” capable of for carrying out a learning mode and decision making.
  • the various systems situations are stored in memory utilities 54 and 56.
  • control unit 18 Decisions that are made by control unit 18 are transmitted via communication ports 29 (using wires or wireless communication) to be presented to the system ⁇ o operators. It should be noted that, when choosing appropriate wavelengths, as well as the light intensities, to be used in the system, the need to maintain suitable conditions for people to remain in the secure area, must be taken into consideration. For example, in an area containing people, while distortion
  • Fig. 4 exemplifying a system 100 of the present invention utilizing a MEMS based on digital micro mirror devices (DMD) and
  • System 100 is configured for preventing imaging of one or more certain objects 12 (disrupting image data) within a certain space 11 (region of interest).
  • System 100 includes a light source unit 14 and a light deflection unit 16.
  • Light source unit 14 includes one or more light source - an array of light
  • Light deflection unit 16 includes a multi-mirror unit 116A, and preferably also includes an optical system 116B.
  • Optical system 116B includes focusing and/or polarization affecting and/or scattering and/or filtering optical elements.
  • Multi-mirror unit 116 A includes an array of a very large number of micro- mirrors (e.g., about 10 5 -2-10 6 or more mirrors each of about 15 ⁇ mxl5 ⁇ m size), associated with a drive unit (not shown here) operable by a control unit 18 to appropriately move the micro-mirrors.
  • Deflection unit 116 is mounted on a 2-6 axes controlled stage 60 operable by control unit 18.
  • Stage 60 provides for displacing deflection unit 116, and in the present example, also provides the movement of light source unit 14, to appropriate orientation so as to direct light towards region of interest 11.
  • Control unit 18 includes a light source operator utility 26 that operates a power supply to light source unit 14.
  • a feedback control assembly 32 is also preferably provided, including one or more imaging device (camera). Assembly 32 serves for the system calibration aimed at providing a desired orientation of the system (randomly deflected light) with respect to region of interest 11 (as described above). This is implemented by moving stage 60 in response to signals coming from camera 32.
  • the operation of camera 32 may be controlled manually using a remote control panel, or by means of unique marking of region of interest 11 (object 12), allowing camera 32 to search for the marked target within the predefined space.
  • Camera 32 also allows for real-time determination, by the system operator, whether the system provides effective image disruption, or not, namely whether an image data collectable by camera 32 during the system operation (i.e., after the system has been actuated to produce randomly varying light deflection) is desirably disrupted or not.
  • the following is an example of measuring the amount of light collected by a light sensor (camera) from a "blocking" (image-disrupting) point-like light source (e.g., LED) as compared to a regular room illumination (ambient light).
  • Fig. 6 exemplifying an illumination system 200 of the present invention mounted in a room typically illuminated by a lamp-based light source 70.
  • System 200 includes a "blocking" light source unit 14 spaced a distance di from an imaging device 13 and located in the vicinity of an object 12 (imaging of which is to be prevented), which is mounted on a wall 72 and is spaced approximately the same distance d 2 from imaging device 13.
  • Object 12 is illuminated by light source (lamp) 70, which in the present example, includes a day light neon lamp of a 40W operational power, a similar cool light lamp, and an incandescent bulb lamp of a 100W power.
  • Blocking light source unit 14 includes a super bright LED at 621nm operating wavelength.
  • Fig. 7 exemplifies a projection system 300 utilizing the present invention for preventing photography of a certain projected material or film.
  • System 300 includes a light source system 314 that includes a "blocking" light source unit 14 aimed at preventing the photography of the projected data and a light source 80 used for the regular operation of the projection system.
  • Light deflection unit 16 includes a single array of MEMS mirrors (DMD-DLP) 316A and also includes a spectral filter unit 316B mounted on a rotatable disk. Also preferably provided in system 300, is an optical system 82 including a first optical unit 82A accommodated in an optical path of light emanating from light source unit 314 upstream of filter disk 316B, and a second optical unit 82B downstream of the filter disk. Filter disk 316B is driven by a disk rotation operator utility 86 of a control unit 18) to thereby selectively allow propagation of a selected wavelength of the illuminated light towards the deflection unit.
  • DMD-DLP MEMS mirrors
  • Filtered light is directed by second optical unit 82B onto mirrors 316A.
  • the latter is controllably operated by a DMD control utility 87 of the control unit to define the spatial structure and the relative intensity of each point in a displayed region.
  • the operation of utility 87 is in turn controlled by a signaling utility 88, namely, by an operating signal (used for information projection) and a blocking signal.
  • a light signal reflected from mirror 316B is projected by a lens arrangement 90 on a screen or any other location.
  • Fig. 8 showing another example of a projection system 400 utilizing the present invention for preventing photography of a certain projected material or film.
  • System 400 is configured generally similar to the above-described system 300, but utilizes several MEMS mirror arrays (DMD-DLP).
  • System 400 includes a light source system 414, a light deflection unit 16, and a control unit 18. It should be understood that in this figure as well as in the previous one, only those utilities of the control unit that are relevant to the understanding of the system operation are shown.
  • Light source system 414 includes a "blocking" light source unit 14 operating for preventing the photography of the projected image, and a light source unit 92 formed by three light sources of wavelengths used for the regular projection system operation.
  • Light deflection unit 16 includes a movable mirror unit formed by four arrays of MEMS mirrors, DMD-1, DMD-2, DMD-3 and DMD-4; and a spectral filter unit 416B formed by four spectral filters, each for directing a different wavelength range from the respective light source towards the respective mirrors' array.
  • each light channel is directed onto its respective mirrors' array, which in turn defines the spatial structure and the relative intensity of each point in a displayed region.
  • the movement of mirrors is controlled by a DMD control utility 87 of the control unit.
  • the operation of utility 87 is controlled by a signaling utility 88, namely, by an operating signal (for the projection purposes) and a blocking signal.
  • FIG. 9 there is exemplified a portable system 500 utilizing the present invention for disrupting undesired photography.
  • System 500 is formed by photography disruption blocks 1 of the present invention (i.e., each configured to produce light randomly varying in time and space) associated with a power source 94. These elements are mounted on a movable object 12 (bone, person or any other subject) that is to be prevented from being photographed or identified by a biometric system, without creating a prominent and suspected camouflage.
  • Fig. 10 showing one more examples of a system 600 of the present invention having a portable and non-expensive configuration.
  • System 600 includes a light source unit 14, a light deflection unit 16 and a control unit 18.
  • System 600 is configured to produce light of different wavelengths randomly varying in time and space.
  • Light source unit 14 may be formed by an array of high intensity LEDs generating light of different wavelengths, or a one or more other type high- intensity light source allowing operation with a broader spectral range.
  • the operation of light source unit 14 is controlled by control unit 18.
  • Deflection unit 16 includes a light modulator 516A movable by an appropriate drive unit 19.
  • Light modulator 516A is configured as a perforated disk 97 that carriers a plurality of spectral filters, generally at 98, mounted in said perforations. The perforations (i.e., spectral filters) are randomly distributed within the disk.
  • Disk 97 is rotated with a variable speed, and is non-concentrically mounted on a shaft of drive unit 19, which operates to vibrate the disk during the disk rotation.
  • light deflection unit 516 includes one or more additional light modulator - two such light modulators 99 being shown in the figure, each in the form of a disk-like mask (e.g., randomly distributed perforations or light transmitting regions spaced by light blocking regions of the disk material).
  • Each such additional modulator is randomly movable (rotatable and vibratable) by its own drive unit.
  • randomly scattered light i.e., randomly varying in trajectory of propagation, and preferably also wavelength and intensity
  • the present invention provides for safety and effective means for preventing undesired imaging of an object.
  • the system of the invention may be a stand-alone system accommodated in the vicinity of the object, so as to propagate randomly varying radiation to a region where an imaging device might be located, or may be arranged to direct such radiation to a region containing the object.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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  • Studio Devices (AREA)

Abstract

La présente invention concerne un procédé et un système pour empêcher de mettre en image une région cible (11). Ce procédé consiste à disposer d'un rayonnement électromagnétique externe qui varie de manière aléatoire dans l'espace et dans le temps à proximité de ladite région cible. Ainsi, un diagramme de rayonnement atteignant un élément sensible au rayonnement d'un dispositif d'imagerie (13) est touché de manière aléatoire lors de la collecte de rayonnement à partir de la région cible.
PCT/IL2005/000634 2004-06-15 2005-06-15 Procede et systeme pour empecher de photographier certains objets WO2005125193A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL162535 2004-06-15
IL16253504A IL162535A0 (en) 2004-06-15 2004-06-15 A method and system to interfere unallowed photographing

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WO2005125193A1 true WO2005125193A1 (fr) 2005-12-29

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US11550146B2 (en) 2021-01-19 2023-01-10 Raytheon Company Small angle optical beam steering using micro-electro-mechanical system (MEMS) micro-mirror arrays (MMAS)

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