Imaging apparatus for taking a picture of a driver of a motor vehicle through a front glass of the motor vehicle

摘要

Disclosed is an imaging apparatus provided with: a light irradiation unit which irradiates a target area with light; a differential image generation unit which generates a differential image between a first image which was taken in synchronization with the irradiation period during which the light irradiation unit irradiates the light and a second image which was taken outside the irradiation period; a transmittance estimation unit which estimates the light transmittance of an object in the target area; and a light exposure adjustment unit which adjusts the exposure based on the estimation result from the transmittance estimation unit. The transmittance estimation unit estimates the transmittance of the object from at least one of the first image, the second image, and the differential image.

主权项

1. An imaging apparatus for taking a picture of a driver of a motor vehicle through a front glass of the motor vehicle, comprising:
a light source unit which irradiates light on a target region; an image generating unit which generates a differential image between a first image taken in synchronism with an irradiation time period during which the light source unit irradiates the light and a second image taken in a time period other than the irradiation time period; a transmittance estimation unit which estimates a light transmittance of the front glass existing in the target region; and an exposure amount adjusting unit which adjusts an exposure amount based on an estimation result of the transmittance estimation unit such that the exposure amount of an image of the driver in the differential image falls within a specified proper range, wherein the transmittance estimation unit estimates the transmittance of the front glass from at least one of the first image, the second image and the differential image.