Patent ID: 9286692
Filing Date: 2016-03-15
CPC Classification: G06T

Claim Text:
1. A method of book leaf tracking, comprising: receiving a video image comprising a book; estimating a current position and orientation of the book within the video image in response to a fiduciary marker of the book visible in the video image; estimating a position and orientation of one or more predetermined markings of the book within the video image in response to the estimated current position and orientation of the book and based on a known physical relationship between the one or more predetermined markings and a leaf of the book; detecting visibility of the one or more predetermined markings of the book at each respective estimated position and orientation thereof; calculating a range of hypothetical leaf turning angles that is constrained in accordance with the estimated visibility of at least one of the predetermined markings of the book at the estimated position and orientation of the at least one predetermined marking for the estimated current position and orientation of the book; and estimating an angle of a turning leaf of the book responsive to the calculated range.