Apparatus and method for object positioning

摘要

An entertainment device comprises an input, a marker detector and a failure boundary calculation processor. The input is operable to receive a captured image from a video camera. The marker detector is operable to detect a fiduciary marker within the captured image, and is also operable to estimate a distance and angle of the fiduciary marker. The failure boundary calculation processor is operable to calculate at least one of an additional distance and an additional angle from the currently estimated distance and angle of the fiduciary marker at which recognition of the fiduciary marker is assumed to fail.

主权项

1. An entertainment device, comprising:
an input operable to receive a captured image from a video camera; a marker detector operable to detect a fiduciary marker within the captured image, and operable to estimate a distance and angle of the fiduciary marker; and a failure boundary calculation processor operable to calculate at least one of an additional distance and an additional angle from the estimated distance and angle of the fiduciary marker as a failure boundary at which recognition of the fiduciary marker is assumed to fail; in which the failure boundary comprises a video camera frustrum and a circle having a diameter equal to a maximum distance at which the fiduciary marker can be recognised, the circle intersecting an image plane of the video camera and having an angle with respect to the image plane of the video camera that is the same as that of the fiduciary marker.