INFORMATION PROCESSOR AND DEVICE INFORMATION DERIVATION METHOD

To provide an information processor that reduces an amount of calculation required for highly accurate estimation calculation of a position and an attitude of a device.SOLUTION: An information processor extracts an image 306 of a marker from a photographed image of an input device 16, and derives a position and an attitude of the input device 16 by calculating three-dimensional coordinates of a candidate marker 312 in a three-dimensional model of the input device 16. The information processor determines, on the basis of a difference in orientation between a screen surface 304 of the photographed image and a surface 314 on which the candidate marker 312 is located among surfaces of the three-dimensional model of the attitude based on sensor data, whether or not the candidate marker can be seen in the captured image, and selects the candidate marker to be used in calculation.SELECTED DRAWING: Figure 14 【課題】デバイスの位置および姿勢の高精度な推定演算に必要な計算量を削減する。【解決手段】情報処理装置は、入力デバイス１６の撮影画像からマーカの像３０６を抽出し、入力デバイス１６の３次元モデルにおける候補マーカ３１２の３次元座標との演算により入力デバイス１６の位置や姿勢を導出する。情報処理装置は、撮影画像のスクリーン面３０４と、センサデータに基づく姿勢の３次元モデルの表面のうち候補マーカ３１２が設けられた面３１４との向きの差に基づき、候補マーカが撮影画像に映り得るか否かを判定し、演算に用いる候補マーカを取捨選択する。【選択図】図１４