Time of flight camera unit and optical surveillance system
First Claim
1. A time of flight (TOF) camera unit for an optical surveillance system, said TOF camera unit comprising:
- a radiation emitting unit for emitting a modulated light for illuminating a surveillance area, wherein the surveillance area is defined by a first plane and a second plane and wherein a first portion of the modulated light illuminates the first plane and a second portion of the modulated light illuminates the second plane;
a radiation detecting unit for receiving the first portion and the second portion of the modulated light reflected from said surveillance area; and
at least one mirror for deflecting the second portion of the modulated light onto said second plane and for deflecting the modulated light reflected from said second plane to the radiation detecting unit, wherein the radiation detecting unit includes an array of pixels configured to detect a phase shift in the modulated light reflected from each of the first plane and the second plane and wherein the radiation detecting unit is configured to generate a three-dimensional image based on a first optical path length determined from said detected phase shift in the modulated light reflected from the first plane and based on a second optical path length determined from said detected phase shift in the modulated light reflected from the second plane, wherein the second optical path length is corrected by an additional optical path length defined by a geometric position of the at least one mirror with respect to the TOF camera unit and a background of the surveillance area.
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Accused Products
Abstract
A time of flight, TOF, camera unit for an optical surveillance system and an optical surveillance system comprising such a TOF camera is disclosed. The TOF camera unit comprises a radiation emitting unit for illuminating a surveillance area defined by a first plane, a radiation detecting unit for receiving radiation reflected from said surveillance area and for generating a three-dimensional image from said detected radiation, and at least one mirror for at least partly deflecting said emitted radiation into at least one second plane extending across to said first plane and for deflecting the radiation reflected from said second plane to the radiation detecting unit. The TOF camera and the at least one mirror may be arranged on a common carrier element.
35 Citations
19 Claims
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1. A time of flight (TOF) camera unit for an optical surveillance system, said TOF camera unit comprising:
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a radiation emitting unit for emitting a modulated light for illuminating a surveillance area, wherein the surveillance area is defined by a first plane and a second plane and wherein a first portion of the modulated light illuminates the first plane and a second portion of the modulated light illuminates the second plane; a radiation detecting unit for receiving the first portion and the second portion of the modulated light reflected from said surveillance area; and at least one mirror for deflecting the second portion of the modulated light onto said second plane and for deflecting the modulated light reflected from said second plane to the radiation detecting unit, wherein the radiation detecting unit includes an array of pixels configured to detect a phase shift in the modulated light reflected from each of the first plane and the second plane and wherein the radiation detecting unit is configured to generate a three-dimensional image based on a first optical path length determined from said detected phase shift in the modulated light reflected from the first plane and based on a second optical path length determined from said detected phase shift in the modulated light reflected from the second plane, wherein the second optical path length is corrected by an additional optical path length defined by a geometric position of the at least one mirror with respect to the TOF camera unit and a background of the surveillance area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical surveillance system comprising:
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a time of flight, TOF, camera for three-dimensionally monitoring an object located in front of a background in a surveillance area, the TOF camera having an emitting unit and a detector unit, the emitting unit configured to add a modulation to a radiation, defining a modulated radiation; at least one mirror element for deflecting the modulated radiation emitted from the emitting unit of the TOF camera to said surveillance area and for deflecting the modulated radiation reflected by the surveillance area to the detector unit of the TOF camera; a control unit for calculating a three-dimensional image of the surveillance area from the modulated radiation received by said detector unit, wherein the control unit detects a distance between the emitting unit and the surveillance area as a function of a phase shift of the modulation present on the modulated radiation reflected from the surveillance area with respect to the modulated radiation emitted from the emitting unit and as a function of an additional optical path length defined by a geometric position of the at least one mirror with respect to the TOF camera unit and the background. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification