Position detection device, projector, and position detection method

A projector comprising:

• an illumination device casting first light and second light that is different from the first light, onto an operation surface and an object;
• a first image pickup device picking up an image of the operation surface and the object and having a higher sensitivity to the first light than to the second light;
• a second image pickup device picking up an image of the operation surface and the object and arranged at a different position from the first image pickup device, the second image pickup device having a higher sensitivity to the second light than to the first light;
• a detection device detecting that the object is in contact with the operation surface when a position of the object specified based on a first picked-up image picked up using the first image pickup device and a position of the object specified based on a second picked-up image picked up using the second image pickup device are within a predetermined range;
• and
• a projection device projecting a projection image via visible light onto the operation surface.

A position detection method comprising:

• casting first light and second light that is different from the first light, onto an operation surface and an object;
• picking up an image of the operation surface and the object by a first image pickup device having a higher sensitivity to the first light than to the second light, and picking up an image of the operation surface and the object by a second image pickup device having a higher sensitivity to the second light than to the first light, from a different direction from a position of the first image pickup device;
• and
• detecting that the object is in contact with the operation surface when a position of the object specified based on a first picked-up image picked up using the first image pickup device and a position of the object specified based on a second picked-up image picked up using the second image pickup device are within a predetermined range.