X-ray or gamma ray systems or devices – Specific application – Stereoscopy
Patent
1998-10-10
2000-09-12
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Stereoscopy
378 42, 378 982, 348 51, H04N 532
Patent
active
061188433
ABSTRACT:
A method for stereoscopically displaying radiographic images of the internal structure of an object and determining the spatial coordinates of a selected feature image inside the object, including the steps of (a) producing a pair of left and right radiographic images on the same object at slightly different angles, (b) using image display means to present the two images, (c) using two distinct optical paths with two reference lines to permit viewing of the left image by the left eye and the right image by the right eye of an observer independently and simultaneously, and (d) performing and measuring horizontal shifting motions of the two images and obtaining the coordinates (X.sub.GA,Y.sub.GA,Z.sub.GA) of an internal feature A with respect to a marker G according to a specified procedure. The procedure begins with aligning the image points of the marker G with their respective reference lines. Preferably, the same procedure is followed again for a second marker. The next step involves aiming and aligning the image points of the internal feature with respect to their respective reference lines. These procedures are carried out to allow for more convenient and accurate measurements of various image parallax values, which are in turn used to precisely calculate the location of an internal feature image of interest, such as a structural defect.
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Huang Wen-Chiang
Jang Bor Z.
Dunn Drew A.
NANOTEK Instruments, Inc.
Porta David P.
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