Patent ID: 7397504
Filing Date: 2008-07-08
Classification: H04N

Abstract:
1. A camera system for capturing images of a whiteboard comprising: a boom positioned above a whiteboard; a single view camera mounted to the distal end of said boom and adjusted such that a tilt angle of a lens with respect to a sensor plane of the single view camera is zero so as to capture an in focus uniform resolution image of said entire whiteboard, wherein the in focus uniform resolution image of said entire whiteboard is captured by, inputting the parameters of the whiteboard comprising whiteboard width, whiteboard height, the height of the whiteboard as imaged by the single view camera, the horizontal distance between the whiteboard and the center of projection of the single view camera, the height of the image sensor, and vertical distance between the center of projection of the single view camera and the top of the whiteboard; and setting a tilt angle of the image sensor with the vertical axis to be approximately parallel with respect to the plane of the whiteboard; computing the focal length of the single view camera using the input parameters of the whiteboard and the set tilt angle so as to capture an in focus, uniform resolution image of the whiteboard.