Patent ID: 7317557
Filing Date: 2008-01-08
Classification: G06F,H04N

Abstract:
1. An apparatus which facilitates the use of a printed or scribed document as an interface with a computer and which comprises: a. a work surface configured to receive a printed or scribed document bearing specialized calibration marks, the document being freely, variably and arbitrarily positioned on the work surface; b. a camera for focusing on the document for generating video signals representing the document in electronic form; and c. a processor linked to the camera for processing an image captured by the camera and configured to identify specialized calibration marks of the document in the captured image and then determine from the location of the specialized calibration marks in the image a transformation between co-ordinates of features in the image and corresponding co-ordinates of features in the document, and that compensates for the positioning of the document on the work surface.