Abstract: An information processing system includes a pointer to designate a position in a three-dimensional space relative to a display, and a first image capture device to capture the position designated by the pointer relative to the display as a virtual image of the pointer. In an example embodiment, a parameter calculator is included to calculate either a first or second parameter. The first parameter is used for transforming coordinates of the designated position in the virtual image to world coordinates, by touching the display. The second parameter is used for transforming coordinates of the designated position in the virtual image when the pointer is operated above the display, without touching the display. Finally, a world coordinate calculator is included to transform the coordinates of the position designated by the pointer in the virtual image to the world coordinates by applying the first parameter or the second parameter.

Abstract: A coordinate calculator includes: an image processing unit configured to calculate a coordinate of an attention point from each of a plurality of images captured by a plurality of imaging units; a transmitter configured to transmit the calculated coordinate to a connected separate information processing device using a built-in function included in an operating system of the information processing device; a receiver configured to receive calibration information of the imaging unit, the calibration information being calculated by the information processing device based on the transmitted coordinate and transmitted by the information processing device using a built-in function included in the operating system of the information processing device; and a storage unit configured to store therein the received calibration information.

Abstract: A coordinate calculator includes: an image processing unit configured to calculate a coordinate of an attention point from each of a plurality of images captured by a plurality of imaging units; a transmitter configured to transmit the calculated coordinate to a connected separate information processing device using a built-in function included in an operating system of the information processing device; a receiver configured to receive calibration information of the imaging unit, the calibration information being calculated by the information processing device based on the transmitted coordinate and transmitted by the information processing device using a built-in function included in the operating system of the information processing device; and a storage unit configured to store therein the received calibration information.

Abstract: An information processing apparatus to detect a position of an object on a display screen includes a memory and circuitry. The circuitry acquires one or more images of the display screen captured with one or more imaging devices. The circuitry further detects an object from the one or more images, detects a position of the object based on the one or more images, and stores, in the memory, position information indicating the detected position of the object. The circuitry further identifies the object based on whether a notification is received from the object, during a time period from a time when the object is detected to a time when a predetermined period of time elapses, the notification indicating that the object is brought into contact with the display screen. The circuitry further determines whether to delete the stored position information depending on the identified object.

Abstract: An information processing system includes a pointer to designate a position in a three-dimensional space relative to a display, a first image capture device to capture the position designated by the pointer relative to the display as a virtual image of the pointer, a parameter calculator to calculate a first parameter used for transforming coordinates of the position designated by the pointer in the virtual image to world coordinates when the pointer is operated on the display by touching the display, or a second parameter used for transforming coordinates of the position designated by the pointer in the virtual image when the pointer is operated above the display without touching the display, and a world coordinate calculator to transform the coordinates of the position designated by the pointer in the virtual image to the world coordinates by applying the first parameter or the second parameter.