Computer graphics processing and selective visual display system – Image superposition by optical means – Plural image superposition
Patent
1994-11-17
1997-12-02
Saras, Steven
Computer graphics processing and selective visual display system
Image superposition by optical means
Plural image superposition
345156, 348 77, 353 28, 36441313, G09G 500
Patent
active
056941420
ABSTRACT:
An interactive three-dimensional (3D) pointing device for selecting points within a subject employs a tracking device which determines the position of the operator, a semi-transparent screen positioned by the operator and the subject and provides this information to a model workstation. The model workstation superimposes computer graphic images of internal structures of the subject on a the semi-transparent screen through which the operator is viewing the subject. The superimposed image is derived from image data either previously generated and stored or obtained with an imaging system. The images of the internal structures are registered with the operator's view of the external structures of the operator. The operator interactively views internal and external structures and the relation between them simultaneously, while moving the screen to select 3D target points at an image depth within the subject. Optionally other input devices may be used to identify current `target points` as selected points. The 3D points are then provided to an output device which utilizes them. Another embodiment employs stereoscopic viewing methods to provide 3D representations of the internal images superimposed on external structures to allow the operator to employ parallax to select 3D points.
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Adams William John
Darrow Robert David
Dumoulin Charles Lucian
General Electric Company
Saras Steven
Snyder Marvin
Zale Lawrence P.
LandOfFree
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