Method for tracking orientation of an object, tracker system and head or helmet-mounted display

Abstract

There is provided a method for determining an intended orientation and/or position of a user's head when the orientation of the user's head is being changed involuntarily by vibratory or buffeting forces transmitted through the user's body from a point of contact of the user's body with said forces. The method comprising: determining a force variable at the point of contact due to said forces; predicting, using an adaptive filter comprising a first input, a first output, a filter coefficient input, and at least one filter coefficient, an involuntary component of orientation of the user's head at a predetermined time due to the sensed variable, wherein the first output is equal to the involuntary component of orientation and the first input comprises the force variable; determining, using at least one tracking system, an orientation variable of the user's head at the predetermined time; subtracting a first value from a second value, the first value equal to the first output and the second value equal to the orientation variable, to provide a third value equal to the filter coefficient input; and updating the at least one filter coefficient based on the filter coefficient input. to be published with the application.