# US 2014/0157442 A1 · Device and methods for detecting a camera > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0157442 A1 - Document ID: US20140157442A1 - Status: Published application - Kind: A1 - Application number: 14/097,076 - Filed: 2013-12-04 - Published: 2014-06-05 - Earliest claimed: 2012-12-04 - Assignees: Optishell Technologies Ltd. - Applicants: Optishell Technologies Ltd. - Inventors: Eliahu Elson; Yossef Gerard Cohen - Web page: https://patentgrep.com/patent/US20140157442A1 ## CPC - G01V 8/12: using one transmitter and one receiver - G06F 21/10: Protecting distributed programs or content, e.g. vending or licensing of copyrighted material (protection in video systems or pay television H04N7/16) {; Digital rights management [DRM]} - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A camera detector device for detecting the presence of an illegal camera inside a room. A camera takes multiple pictures of a room and identifies reflections in each still image. If a reflection with similar properties appears repeatedly overtime than the reflection is identified as an illegal camera positioned towards the camera detector device. ## Claims ### Claim 1 A camera detector device for detecting the presence of an illegal camera inside a room, the device comprising: a light source for illuminating a room; a light detector for capturing multiple images of said room; a blob database for storing blobs representing reflections identified in said captured images, each blob being identified via one or more properties; and a processor for analyzing said multiple images of the room taken over a period of time in order to identify blobs representing reflections in said images, and signaling a blob as an illegal camera if said blob appears in said multiple images over a predetermined amount of time with similar blob properties within predefined threshold values for each blob property. ### Claim 2 (depends on 1) The camera detector device according to claim 1, further comprising a scanning unit, such that each time only a partial image of the room is captured and the partial images are combined to form a single image of the room. ### Claim 3 (depends on 1) The camera detector device according to claim 1, wherein said blob properties comprise location, size, intensity, shape or any combination thereof. ### Claim 4 (depends on 1) The camera detector device according to claim 1, wherein the reflections captured are compared during every minute or less. ### Claim 5 (depends on 1) The camera detector device according to claim 1, wherein the processor first analyzes the reflections in the room without the audience and then cancels these reflections as permanent reflections of the room from images captured with the audience. ### Claim 6 (depends on 1) The camera detector device according to claim 1, wherein detection operation commences only when an audience is detected in the room. ### Claim 7 (depends on 6) The camera detector device according to claim 6, wherein the audience is detected via a volume detector, a sound detector, input from a person, a signal from the film projection unit or any combination thereof. ### Claim 8 (depends on 1) The camera detector device according to claim 1, wherein the light source uses Infra-Red (IR) light. ### Claim 9 (depends on 8) The camera detector device according to claim 8, wherein an additional light source with visible light is used. ### Claim 10 (depends on 9) The camera detector device according to claim 9, wherein images captured with IR light are compared to images captured with visible light. ### Claim 11 (depends on 1) The camera detector device according to claim 1, wherein the light source uses visible light and the light source is operated in a movie theater when at least one of the following conditions is met: the illuminance of the movie screen is at least 10 lux; the value of the illuminance of the movie screen is at least 10% of the value of the light source; or the audible sound of the movie played is at least 50 decibels. ### Claim 12 (depends on 1) The camera detector device according to claim 1, wherein said camera detector is placed in a movie theater and said illegal camera is an illegal camera filming a movie played on a screen in said movie theater. ### Claim 13 (depends on 1) The camera detector device according to claim 1, wherein after an illegal camera is detected a message is spoken and/or overlaid on a screen in said room urging the user of said illegal camera to stop filming with said illegal camera. ### Claim 14 (depends on 11) The camera detector device according to claim 11, wherein said message comprises information about the location of said illegal camera in the room. ### Claim 15 (depends on 11) The camera detector device according to claim 11, wherein said message comprises a picture of the area of said illegal camera in the room or a close-up picture of the person using the illegal camera. ### Claim 16 A method for detecting the presence of one or more active video cameras positioned towards a screen by capturing electromagnetic radiation emanating from said one or more video cameras, the method comprising: illuminating a room with infrared and/or visible light signal; having multi length signal illuminated on the audience and the space in front the screen; having an infrared signal emitted from the audience and any object in the said space; having multi length signal emitted from the audience and any object in the said space; passing said infrared signal through an optical filter; detecting said infrared signal by a detector; and translating the signal received by the detector to a signal representing the estimated number of one or more active video cameras positioned towards to the screen. ### Claim 17 An overlay system in a movie theater adapted for receiving a signal from a camera detector that an illegal camera has been detected in the movie theater and overlaying a text warning message on the movie screen of said movie theater. ### Claim 18 (depends on 17) The overlay system according to claim 17, wherein said message comprises information about the location of said illegal camera in the room. ### Claim 19 (depends on 18) The overlay system according to claim 18, wherein said message comprises a picture of the area of said illegal camera in the room or a close-up picture of the person using the illegal camera. ### Claim 20 (depends on 17) The overlay system according to claim 17, wherein the text message is accompanied by an audio message.