Calibration method and projection-type display system

A projection-type display system, comprising:

• a projection-type display device;
• a camera;
• and
• an information processing device,
• wherein the information processing device
• acquires a first image captured by a camera at a first timing, the first image showing an area on which an image is projected by a projection-type display device,
• detects a plurality of feature points in the acquired first image,
• superimposes the plurality of detected feature points on the first image and displays the superimposed feature points on a monitor,
• receives a user's operation of selecting a part of the plurality of detected feature points as a plurality of reference points,
• acquires a second image captured by the camera at a second timing after the first timing, the second image showing the area, and
• detects a deviation of a relative position between the camera and the area by using the plurality of selected reference points and the acquired second image.