Patent ID: 9002676
Filing Date: 2015-04-07
Classification: A63F

Abstract:
1. A gravity direction calculating apparatus for calculating a direction of gravity with respect to an input device, the apparatus comprising: an obtaining means for successively obtaining acceleration data output from a multi-axis acceleration sensor included in the input device; a period detecting means for detecting as a movement period a period from start to end of a movement of the input device, wherein the detection is made based on the obtained acceleration data; and a gravity direction calculating means for calculating a sum of acceleration vectors corresponding to one or more pieces of acceleration data obtained during the movement period, and determining a direction of a vector indicated by the sum as being the gravity direction, wherein each of the acceleration vectors is a vector whose components are acceleration values with respect to a plurality of axes of acceleration values corresponding to axes indicated by the acceleration data and the acceleration vectors correspond to a plurality of times during the movement period.