Vehicle occupant head positioning system
First Claim
Patent Images
1. In a motor vehicle having an occupant, a vehicle occupant head positioning system comprising:
- wave sensing assembly comprising at least one transmitter for transmitting waves towards a head of an occupant in the vehicle, and at least one receiver for receiving waves reflected off the occupant head;
image capture assembly comprising at least one camera directed at the occupant head for capturing images, and at least one light emitting device for illuminating the occupant head when the images are being captured; and
one or more sensor fusion processor(s) configured toprocess the waves received by the at least one receiver to compute the radial range with respect to the at least one receiver,process the images captured by the at least one camera to determine an image position of the occupant head, anddetermine from the radial range and the image position a three dimensional position of the occupant head by;
providing a head state model of a positional state of the occupant head;
determining a fused range based on the radial range and a range determined from frame-to-frame changes in image coordinates in the images captured by the image capture assembly;
converting the fused range and image coordinates of the captured images to three dimensional coordinates based on corresponding focal length(s) of the at least one camera;
determining a best match between the head state model and the three dimensional coordinates; and
updating the head state model with the three dimensional coordinates and an occupant head track position predicted by the head state model.
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Abstract
Described are occupant positioning systems, and methods of use thereof, which combine image capture and radar or ultrasonic sensors, determine the head position and/or velocity of a vehicle occupant'"'"'s head in three dimensions for use in a driver monitoring application. The driver monitoring applications may include features such as driver drowsiness estimation and indication, driver attention monitoring, driver gaze direction and driver gaze positioning, driver identification, head-up display adjustment and automatic sun blocking. These are features that can improve the operational safety of the vehicle.
24 Citations
10 Claims
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1. In a motor vehicle having an occupant, a vehicle occupant head positioning system comprising:
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wave sensing assembly comprising at least one transmitter for transmitting waves towards a head of an occupant in the vehicle, and at least one receiver for receiving waves reflected off the occupant head; image capture assembly comprising at least one camera directed at the occupant head for capturing images, and at least one light emitting device for illuminating the occupant head when the images are being captured; and one or more sensor fusion processor(s) configured to process the waves received by the at least one receiver to compute the radial range with respect to the at least one receiver, process the images captured by the at least one camera to determine an image position of the occupant head, and determine from the radial range and the image position a three dimensional position of the occupant head by; providing a head state model of a positional state of the occupant head; determining a fused range based on the radial range and a range determined from frame-to-frame changes in image coordinates in the images captured by the image capture assembly; converting the fused range and image coordinates of the captured images to three dimensional coordinates based on corresponding focal length(s) of the at least one camera; determining a best match between the head state model and the three dimensional coordinates; and updating the head state model with the three dimensional coordinates and an occupant head track position predicted by the head state model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification