Asahi Kasei Microdevices Corporation

Ryosuke Sasanuma

Hidekazu Tsukiji

Norio Shibusawa

An estimation apparatus comprises: a collection unit configured to collect a plurality of pieces of update information used for updating reference information, which indicates measurement values in accordance with a position or an attitude of a second portion against a first portion which is measured by at least one magnetic sensor while changing at least one of the position and the attitude of the second portion against the first portion over a predetermined movable range; a clustering unit configured to perform clustering on the plurality of pieces of update information according to a predetermined classification condition; and an updating unit configured to update the reference information based on at least one piece of update information included in a maximum class into which a highest number of pieces of information are classified among the plurality of pieces of update information.

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Tokyo, Japan

Ryosuke Sasanuma