Data processing: measuring – calibrating – or testing – Measurement system – Orientation or position
Patent
1997-04-04
1999-07-27
Barlow, John
Data processing: measuring, calibrating, or testing
Measurement system
Orientation or position
702153, H04N 500
Patent
active
059307404
ABSTRACT:
A method and apparatus for generating a viewport definition for a computer generated image using sensor information relating to a video camera's pan, tilt, zoom, and focus controls. The method generally comprises the steps of: (a) establishing reference points within an enclosed space which is to be used for recording images with the camera; (b) positioning the camera within the enclosed space relative to the reference points such that the camera position can be determined through triangulation with respect to the reference points; (c) developing position data through triangulation which identifies the camera position in a coordinate system relative to the reference points; (d) recording camera orientation data from sensors disposed to detect camera parameters defining the camera's pan, tilt, zoom, and focus settings; and (e) developing a database defining a viewport for the camera defined from a combination of the position data and the camera orientation data. Calculating the viewport (i.e., a nodal point or eyepoint, an orientation, a field of view, a focal plane distance, and a focus of expansion) as the camera moves is the ultimate goal of the camera tracking device.
REFERENCES:
patent: 4609939 (1986-09-01), Kozawa et al.
patent: 5059019 (1991-10-01), McCullough
patent: 5502482 (1996-03-01), Graham
Leonardo Chiariglione, Signal Processing Image Communication, A Differential Method for Simultaneous Estimation of Rotation, Change of Scale and Translation pp. 69-80, May 1990.
Goshtasby, Ardeshir, vol. 26, No. 1, Jan. 1988, Registration of Images with Geometric Distortions, pp. 60-64.
Barlow John
Evans & Sutherland Computer Corporation
Miller Craig Steven
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