Method and system for light patterning and imaging
An imaging system is disclosed. The system comprises: a first imaging device and a second imaging device being spaced apart and configured to provide partially overlapping field-of-views of a scene over a spectral range from infrared to visible light. The system comprises at least one infrared light source constituted for illuminating at least the overlap with patterned infrared light, and a computer system configured for receiving image data pertaining to infrared and visible light acquired by the imaging devices, and computing three-dimensional information of the scene based on the image data. The image data optionally and preferably comprises the patterned infrared light as acquired by both the imaging devices.
1. An imaging system, comprising:
an imaging device having a plurality of sensor pixels and a rolling shutter, and being configured for generating line valid signal (LV) pulses for controlling exposure times of said sensor pixels to acquire an image of a scene over a spectral range from infrared to visible light, according to a sensing sequence of said rolling shutter;
an infrared light source configured for generating an infrared pulse sequence illuminating at least part of said scene; and
a controller for synchronizing said infrared pulse sequence with said LV pulses, in a manner that for each infrared pulse of said sequence and each LV pulse that controls a sensor pixel exposed to said infrared pulse, an onset of said infrared pulse precedes an onset of said LV pulse by a predetermined time offset.
2. The system according to claim 1 , comprising a plurality of infrared light sources, each constituted to illuminate a predetermined part of said scene, wherein said controller is configured for activating and deactivating said light sources synchronously with a temporal field-of-view provided by said rolling shutter.
3. The system according to claim 1 , comprising a plurality of infrared light sources, each constituted to illuminate a predetermined part of said scene, wherein said controller is configured for activating and deactivating said light sources synchronously with a temporal field-of-view provided by said rolling shutter.
4. The system according to claim 2 , wherein at least one of said plurality of infrared light sources is configured for generating flood infrared illumination.
5. The system according to claim 3 , wherein at least one of said plurality of infrared light sources is configured for generating flood infrared illumination.
6. The system according to claim 2 , wherein at least one of said plurality of infrared light sources is configured for generating an infrared pattern.
7. The system according to claim 2 , wherein at least one of said plurality of infrared light sources is configured for generating an infrared pattern.
8. The system according to claim 6 , wherein said at least one of said plurality of infrared light sources is a light pattern device, which comprises:
a first optical layer having an arrangement of monolithic light source elements, each light source element having a patterned light emitting surface configured to provide a light beam which is spatially patterned according to said light emitting surface; and
a second optical layer having an arrangement of light redirecting elements and being characterized by a focal plane, said light redirecting elements being constituted to redirect patterned light beams generated by said first optical layer to provide patterned illumination.
9. The system according to claim 8 , wherein said first optical layer is at or near said focal plane.
10. The system according to claim 8 , further comprising a light diffuser positioned between said first and said second optical layers at or near said focal plane.
11. The system according to claim 8 , wherein said light source elements are arranged in individually addressable lines.
12. The system according to claim 9 , wherein said light source elements are arranged in individually addressable lines.
13. The system according to claim 8 , wherein each of said light source elements is addressable individually.
14. The system according to claim 9 , wherein each of said light source elements is addressable individually.