Adaptive lighting control for vision-based occupant sensing
First Claim
Patent Images
1. An object surface characterization system with adaptive lighting control, the system comprising:
- a light projector;
a light source;
a camera;
a processor coupled to the light projector, the light source and the camera; and
a memory subsystem coupled to the processor, the memory subsystem storing code that when executed by the processor instructs the processor to perform the steps of;
controlling the light projector to selectively provide a plurality of light beams arranged in a beam matrix of rows and columns, wherein the light beams impinge on a surface of a target and are reflected from the surface of the target;
controlling the light source to selectively illuminate the surface of the target;
directing the camera to capture a first image frame and a second image frame, wherein the first image frame includes contributions provided by the light source and the plurality of light beams of the beam matrix after reflection from the surface of the target, and wherein the second image frame include contributions provided by the light source after reflection from the surface of the target;
examining at least a portion of the first and second image frames to provide an indication of the intensities of the plurality of light beams and the light source; and
controlling a camera integration time of the camera and a pulse width of the light source based upon the intensities of the plurality of light beams and the light source to achieve a desired target illumination.
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Abstract
An object surface characterization system with adaptive lighting control includes a light projector, a light source, a camera, a processor and a memory subsystem. The processor is coupled to the light projector, the light source and the camera, as well as the memory subsystem. The memory subsystem stores code that, when executed by the processor, instructs the processor to perform a number of steps to achieve adaptive lighting control for the system.
32 Citations
20 Claims
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1. An object surface characterization system with adaptive lighting control, the system comprising:
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a light projector;
a light source;
a camera;
a processor coupled to the light projector, the light source and the camera; and
a memory subsystem coupled to the processor, the memory subsystem storing code that when executed by the processor instructs the processor to perform the steps of;
controlling the light projector to selectively provide a plurality of light beams arranged in a beam matrix of rows and columns, wherein the light beams impinge on a surface of a target and are reflected from the surface of the target;
controlling the light source to selectively illuminate the surface of the target;
directing the camera to capture a first image frame and a second image frame, wherein the first image frame includes contributions provided by the light source and the plurality of light beams of the beam matrix after reflection from the surface of the target, and wherein the second image frame include contributions provided by the light source after reflection from the surface of the target;
examining at least a portion of the first and second image frames to provide an indication of the intensities of the plurality of light beams and the light source; and
controlling a camera integration time of the camera and a pulse width of the light source based upon the intensities of the plurality of light beams and the light source to achieve a desired target illumination. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for providing an object surface characterization system with adaptive lighting control, comprising the steps of:
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controlling a light projector to selectively provide a plurality of light beams arranged in a beam matrix of rows and columns, wherein the light beams impinge on a surface of a target and are reflected from the surface of the target;
controlling a light source to selectively illuminate the surface of the target;
directing a camera to capture a first image frame and a second image frame, wherein the first image frame includes contributions provided by the light source and the plurality of light beams of the beam matrix after reflection from the surface of the target, and wherein the second image frame include contributions provided by the light source after reflection from the surface of the target;
examining at least a portion of the first and second image frames to provide an indication of the intensities of the plurality of light beams and the light source; and
controlling a camera integration time of the camera and a pulse width of the light source based upon the intensities of the plurality of light beams and the light source to achieve a desired target illumination. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An object surface characterization system with adaptive lighting control, the system comprising:
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a light projector;
a light source;
a camera;
a processor coupled to the light projector, the light source and the camera; and
a memory subsystem coupled to the processor, the memory subsystem storing code that when executed by the processor instructs the processor to perform the steps of;
controlling the light projector to selectively provide a plurality of light beams arranged in a beam matrix of rows and columns, wherein the light beams impinge on a surface of a target and are reflected from the surface of the target;
controlling the light source to selectively illuminate the surface of the target;
directing the camera to capture a first image frame and a second image frame, wherein the first image frame includes contributions provided by the light source and the plurality of light beams of the beam matrix after reflection from the surface of the target, and wherein the second image frame include contributions provided by the light source after reflection from the surface of the target;
examining at least a portion of the first and second image frames to provide an indication of the intensities of the plurality of light beams and the light source; and
controlling a camera integration time of the camera and a pulse width of the light source based upon the intensities of the plurality of light beams and the light source to achieve a desired target illumination, wherein the light source includes at least one light emitting diode (LED) and the light projector includes a laser and a diffraction grating. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification