Vehicle occupant detection device
First Claim
1. A vehicle occupant detection device that comprises:
- a light-receiving element for receiving light from a vehicle interior; and
signal processing means for processing a signal detected by the light-receiving element, and that detects, based on an image signal obtained using the light-receiving element, a vehicle occupant in the vehicle interior via the signal processing means, the vehicle occupant detection device further comprising;
a band-pass filter, which has a frequency range whose transmission band is substantially the same as a sunlight absorption spectrum band, and in which a wavelength of the light received by the light-receiving element is selected according to the transmission band.
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Accused Products
Abstract
A vehicle occupant detection device includes light-receiving elements for receiving light from a vehicle interior, and a signal processing part for processing a signal detected by the light detecting elements. A vehicle occupant in the vehicle interior is detected by the signal detecting part on the basis of an image signal obtained by the light-receiving elements. The vehicle occupant detection device has a band-pass filter, which has a frequency range whose transmission band is substantially the same as a sunlight absorption spectrum band, and in which a wavelength of the light received by the light-receiving element is selected in accordance with the transmission band. An object that is to be detected and is present in the vehicle interior is accordingly imaged/detected by the vehicle occupant detection device using a certain wavelength region of near infrared light, and decreases in contrast in relation with sunlight are eliminated.
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Citations
7 Claims
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1. A vehicle occupant detection device that comprises:
- a light-receiving element for receiving light from a vehicle interior; and
signal processing means for processing a signal detected by the light-receiving element, and that detects, based on an image signal obtained using the light-receiving element, a vehicle occupant in the vehicle interior via the signal processing means, the vehicle occupant detection device further comprising;a band-pass filter, which has a frequency range whose transmission band is substantially the same as a sunlight absorption spectrum band, and in which a wavelength of the light received by the light-receiving element is selected according to the transmission band. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a light-receiving element for receiving light from a vehicle interior; and
Specification