Patent ID: 11947736
Assignee: VARJO TECHNOLOGIES OY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 14:
15. A method for controller-tracking, the method comprising:
receiving at least one image captured by at least one camera, the at least one image representing at least one controller from a perspective of the at least one camera, the at least one camera being arranged on a portion of a head-mounted display (HMD) that faces a real-world environment in which the HMD is in use, and wherein one or more light sources are arranged on the at least one controller that is to be tracked, the at least one controller being associated with the HMD, and wherein the one or more light sources, in operation, provide light having at least one wavelength that is detectable by the at least one camera;
identifying at least one image segment in the at least one image that represents at least one light source of the at least one controller;
determining a level of focussing of the at least one light source in the at least one image, based on characteristics associated with pixels of the at least one image segment;
determining a distance between the at least one camera and the at least one light source, based on the level of focussing of the at least one light source in the at least one image, intrinsic parameters of the at least one camera, and a reference focussing distance corresponding to a wavelength of light provided by the at least one light source; and
determining a pose of the at least one controller in a global coordinate space of the real-world environment, using the distance between the at least one camera and the at least one light source.