Calibration device, calibration method, and calibration chart device

A calibration method, comprising:

• causing a peak detector to detect, from plural infrared images shot by sequentially moving a marker whose distribution of an infrared-ray radiation amount in a moving direction is a unimodal distribution in a first direction and plural infrared images shot by sequentially moving the marker in a second direction different from the first direction, a position of the marker at which a pixel value is maximized, for each pixel;
• and
• causing a calibration processor to calculate a camera parameter by using the position of the marker detected by the peak detector for each pixel.

A calibration chart device, comprising:

• a marker whose distribution of an infrared-ray radiation amount in a moving direction is a unimodal distribution;
• and
• a driving controller configured to separately move the marker in a first direction and a second direction different from the first direction.