Remote coordinate input device and remote coordinate input method

A remote coordinate input system for use with a screen, comprising:

• a designator including a first surface on which a hollow disk-shaped first light reflecting element is arranged on a plane and a second light reflecting element arranged on an orthogonal axis to the plane said second reflecting element arranged on a second surface on a plane different from said first surface;
• an imaging device that images relative positional relationship between the hollow disk-shaped first light reflecting element and the second light reflecting element;
• an irradiating device that irradiates the hollow disk-shaped first light reflecting element and the second light reflecting element;
• a coordinate converter that obtains an orientation of the designator with respect to said imaging device from an image which is imaged by said imaging device and converts the image to planar coordinates;
• an output device that outputs the planar coordinates that are obtained by the coordinate converter;
• and
• a display that displays designating information on the screen based on the planar coordinates that are obtained from said output device.

A remote coordinate input method, comprising the steps of:

• obtaining a first image from a first reflecting element;
• obtaining a second image from a second reflecting element;
• obtaining a reference coordinate from a coordinate of said first image;
• obtaining an orientation of a designator with respect to an imaging device from a positional relationship between the second image and the reference coordinate;
• and
• specifying a designating position on a display according to said orientation.