| 摘要 |
A book 1000 for use in an augmented reality system comprises a first page 1003 on a first leaf of the book comprises a first fiduciary marker 1030 for indicating the orientation of the book to a recognition system such as a camera, and a second page 1004, 1006 on a second leaf of the book comprises a second fiduciary marker 1040 for indicating the orientation of the book to a recognition system and also a page marker 1033, 1044, 1066 for indicating the page number of the second page to the recognition system, wherein the orientation of the page marker is ambiguous without reference to a fiduciary marker, and the page marker is positioned on the second page closer to an edge of the page than the second fiduciary marker so as to become visible to the recognition system before the second fiduciary marker, as the book is turned to the second page; alternatively an entertainment device comprises a video input for receiving captured video frames comprising an image of the book. Preferably the page marker is a non-alphanumeric pattern positioned in a margin region 1400 of the page at one or all of the corners of the page. The page marker encodes a page number as bits (Fig.7a). |
