| 摘要 |
PROBLEM TO BE SOLVED: To calculate the intensity of light sensed by an imaging device while removing the influence of noise generated in the imaging device. SOLUTION: The illuminance acquisition apparatus includes: a noise model data calculation unit 12 for calculating noise model data modeling the influence of noise generated in an imaging device in an output value of the imaging device using imaging data obtained by imaging at different exposure times, due to the imaging device which converts the intensity of light into electrical energy and outputs it; and an illuminance calculation unit (radiation illuminance calculation unit 13) which calculates the output value of the imaging device while taking into account the influence of the noise from the calculated noise model data and the output value of the imaging device in a case where the imaging device picked up a predetermined image, uses the output value of the imaging device taking into account the influence of noise to acquire optical energy from a correspondence relation between the output value of the imaging device and the optical energy (intensity of light sensed by imaging device×exposure time), and calculating the intensity of light of the imaging device from the acquired optical energy and the exposure time in a case where the imaging device picked up the predetermined image. COPYRIGHT: (C)2007,JPO&INPIT |
