Correction of Over and Under Exposure Images Using Multiple Lighting System
Jonghoon Im, Atsushi Yamashita, Hiromitsu Fujii, Hajime Asama · 2014
When images are acquired in bright condition, it can cause a loss of highlight details (over exposure) in bright area and a loss of shadow details (under exposure) in dark area. Over and under exposure causes a big problem when people investigate dangerous place like Fukushima nuclear plant through the camera attached remote control robot. In this paper, we propose a method to correct the over and under exposure image to solve the problem. In order to compensate over and under exposure images, multiple images are acquired in different lighting conditions. In our method, two images are acquired by turning on and off multiple illuminations which set in different positions. The image processing is as follows. The first acquired image set to base image. Next, we extract over and under exposure area from the base image, and interpolate extracted area with other images. The results show that the over and under exposure is removed from the image by our proposed method.