Position detection method, position detection device, and interactive projector

A position detection device configured to detect a position of a pointing element with respect to an operation surface, comprising:

• an imaging section including a first camera configured to obtain a first taken image by imaging the pointing element with the operation surface as a background, and a second camera disposed at a position different from a position of the first camera, and configured to obtain a second taken image by imaging the pointing element with the operation surface as the background;
• an illumination section including a first illumination section configured to perform illumination so that a shadow of the pointing element on the operation surface is not substantially imaged by the first camera, and a second illumination section configured to perform illumination so that the shadow of the pointing element, while present on the operation surface, is not substantially imaged by the second camera;
• and
• a position detection section configured to detect a position of the pointing element with respect to the operation surface using the first taken image obtained by the first camera while performing the illumination with the first illumination section, and the second taken image obtained by the second camera while performing the illumination with the second illumination section.

An interactive projector configured to detect a position of a pointing element with respect to an operation surface, comprising:

• a projection section configured to project a projection image on the operation surface;
• an imaging section including a first camera configured to obtain a first taken image by imaging the pointing element with the operation surface as a background, and a second camera disposed at a position different from a position of the first camera, and configured to obtain a second taken image by imaging the pointing element with the operation surface as the background;
• an illumination section including a first illumination section configured to perform illumination so that a shadow of the pointing element on the operation surface is not substantially imaged by the first camera, and a second illumination section configured to perform illumination so that the shadow of the pointing element, while present on the operation surface, is not substantially imaged by the second camera;
• and
• a position detection section configured to detect a position of the pointing element with respect to the operation surface using the first taken image obtained by the first camera while performing the illumination with the first illumination section, and the second taken image obtained by the second camera while performing the illumination with the second illumination section.