US 7,590,311 B2
Sensing device for sensing a position within a region
Kia Silverbrook, Balmain (Australia); Paul Lapstun, Balmain (Australia); and Simon Robert Walmsley, Balmain (Australia)
Assigned to Silverbrook Research Pty Ltd, Balmain, New South Wales (Australia)
Filed on Jun. 20, 2005, as Appl. No. 11/155,556.
Application 11/155556 is a continuation of application No. 10/291823, filed on Nov. 12, 2002, granted, now 6,980,704.
Application 10/291823 is a continuation of application No. 09/575174, filed on May 23, 2000, granted, now 6,870,966.
Claims priority of application No. PQ0559 (AU), filed on May 25, 1999; and application No. PQ1313 (AU), filed on Jun. 30, 1999.
Prior Publication US 2005/0232516 A1, Oct. 20, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. G06K 9/22 (2006.01)
U.S. Cl. 382—313  [382/312] 18 Claims
OG exemplary drawing
 
1. A sensing device for sensing a region provided on or in a surface, the surface including at least one region, having printed therein or thereon coded data indicative of an identity of the at least one region, and visible information at least some of the information being at least partially related to the at least one region, the coded data including a number of data portions, each data portion in the at least one region having an identical data portion identity, the sensing device including:
a sensor for:
sensing a number of images of the coded data when the sensing device is placed in an operative position relative to the at least one region;
comparing the images to determine common features in sequential images; and
determining movement of the sensing device relative to the at least one region by determining changes in position of the common features between the sequential images; and
generating, using the sensed coded data, indicating data at least partially indicative of the identity of the at least one region; and,
a communicator configured to communicate the indicating data to a computer system.