Camera Calibration with a Transparent Calibration Tool Using Color Filters: Application to Stereo Camera Calibration for a Distant Object

In this paper, we propose a transparent calibration tool that can calibrate in a straightforward manner without resetting or removing the tool, which consists of two parallel transparent boards with patterns of dots of a color filter material. The tool is installed in front of a color camera, which acquires images through it. Images for calibration and the scene image are acquired simultaneously in different color bands. The proposed method is applied to stereo camera calibration for a distant small object.