Time-of-flight based imaging system using a display as illumination source
First Claim
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1. A time-of-flight based imaging system comprising:
- a photon emitter used as an illumination source for illuminating a scene;
a photon sensor to sense photons reflected by an object in the scene;
an electronic system for delivering a signal depending on the reception time of photons reflected by said scene onto said photon sensor,a backlit display comprising a backlight assembly and an electronic display placed in front of the backlight assembly,said backlight assembly comprises LEDs which are used for illuminating the electronic display and which are also used as said illumination source by superposing on the LEDs intensity normally used for lighting the display, a modulated light;
the photon sensor being configured to record the modulated light reflected by an object and,the electronic system being configured to demodulate the modulated light reflected by an object and recorded by the photon sensor, to determine the position of said object, and the distance to said object,wherein the system further comprises a backlighting driver for successively illuminating said photon sensor from different regions of said display, and computing means for computing the position of a light reflecting object based on light received from the different regions and a triangulation method.
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Abstract
The present invention concerns a time-of-flight based imaging system having a photon emitter used as an illumination source, a photon sensor, and an electronic system for delivering a signal depending on the reception time of photons by said photon detector. The electronic display is used as the photonic source.
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Citations
19 Claims
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1. A time-of-flight based imaging system comprising:
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a photon emitter used as an illumination source for illuminating a scene; a photon sensor to sense photons reflected by an object in the scene; an electronic system for delivering a signal depending on the reception time of photons reflected by said scene onto said photon sensor, a backlit display comprising a backlight assembly and an electronic display placed in front of the backlight assembly, said backlight assembly comprises LEDs which are used for illuminating the electronic display and which are also used as said illumination source by superposing on the LEDs intensity normally used for lighting the display, a modulated light; the photon sensor being configured to record the modulated light reflected by an object and, the electronic system being configured to demodulate the modulated light reflected by an object and recorded by the photon sensor, to determine the position of said object, and the distance to said object, wherein the system further comprises a backlighting driver for successively illuminating said photon sensor from different regions of said display, and computing means for computing the position of a light reflecting object based on light received from the different regions and a triangulation method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Illumination method for an imaging system comprising at least a backlit display comprising a backlight assembly and an electronic display placed in front of the backlight assembly, the backlight assembly comprising LEDs which are used for illuminating the electronic display and which are also used as an illumination source by superposing on the LEDs intensity normally used for lighting the display, a modulated light;
- a photon sensor; and
an electronic system for delivering a signal by said photon sensor;
comprising the steps of;generating a modulated illumination from successively different regions of an electronic display using a backlighting driver by superposing on the LEDs intensity normally used for lighting the display, a modulated light; computing the distances between the center of each region successively lit and the photon sensor; recording the reception time of the modulated illumination reflected by an object or the phase delay between the emitted illumination and the reflected illumination using the photon sensor; demodulating the modulated light reflected by an object and recorded by the photon sensor, using the electronic system, to determine the position of said object, and the distance to said object, wherein the position of a light reflecting object is computed based on light received from the different regions and a triangulation method. - View Dependent Claims (15, 16)
- a photon sensor; and
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17. A portable device comprising:
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an electronic display; a led-based backlighting system for backlighting said electronic display; a photon detector; an electronic system for delivering a signal depending on the time of flight of photons sent by said backlighting system, reflected by an object and received by said photon detector; wherein LEDs of the led-based backlighting system are used for illuminating the electronic display and are also used as an illumination source to illuminate an object by superposing a modulated light on the LEDs intensity normally used for lighting the display; the photon detector being configured to record the modulated light reflected by an object and, the electronic system being configured to demodulate the modulated light reflected by an object and recorded by the photon sensor, to determine the position of said object, and the distance to said object, wherein the system further comprises a backlighting driver for successively illuminating said photon sensor from different regions of said display, and computing means for computing the position of a light reflecting object based on light received from the different regions and a triangulation method. - View Dependent Claims (18)
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19. Computer program product containing a non-transitory computer program which is capable of being executed by processing means in order to carry out an illumination method for an imaging system comprising at least a backlit display comprising a backlight assembly and an electronic display placed in front of the backlight assembly, the backlight assembly comprising LEDs which are used for illuminating the electronic display and which are also used as an illumination source by superposing on the LEDs intensity normally used for lighting the display, a modulated light;
- a photon sensor; and
an electronic system for delivering a signal by said photon sensor;
the illumination method comprising the steps of;generating a modulated illumination from successively different regions of an electronic display using a backlighting driver by superposing on the LEDs intensity normally used for lighting the display, a modulated light; computing the distances between the center of each region successively lit and the photon sensor; recording the reception time of the modulated illumination reflected by an object or the phase delay between the emitted illumination and the reflected illumination using the photon sensor; demodulating the modulated light reflected by an object and recorded by the photon sensor, using the electronic system, when said program is executed by said processing means in order to carry out the driving of the illumination source of a time-of- flight based imaging system comprising; a photon emitter used as an illumination source for illuminating a scene; a photon sensor to sense photons reflected by an object in the scene; an electronic system for delivering a signal depending on the reception time of photons reflected by said scene onto said photon sensor; a backlit display comprising a backlight assembly and an electronic display placed in front of the backlight assembly; said backlight assembly comprises LEDs which are used for illuminating the electronic display and which are also used as said illumination source by superposing on the LEDs intensity normally used for lighting the display, a modulated light; the photon sensor being configured to record the modulated light reflected by an object and, the electronic system being configured to demodulate the modulated light reflected by an object and recorded by the photon sensor, to determine the position of said object, and the distance to said object, wherein the system further comprises a backlighting driver for successively illuminating said photon sensor from different regions of said display, and computing means for computing the position of a light reflecting object based on light received from the different regions and a triangulation method.
- a photon sensor; and
Specification