Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1995-05-22
1996-08-27
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
2503581, G01N 2300
Patent
active
055503764
ABSTRACT:
A method of calibrating a linear pushbroom imaging device used in non-destructive testing of a part manufactured according to a CAD model involves identifying the location of fixed reference points, such as tooling balls in the CAD model. Positioning the part on a fixture having tooling balls fixed relative to each other in the same manner as those in the CAD model. Adjusting the part on the fixture such that points on the surface of the part known to be accurate have the same locations relative to the tooling bails as the CAD part is to the CAD tooling balls. Obtaining several projection images of the part and tooling balls at different angles about an axis of rotation passing through the part. Using the known 3D locations of the center of the CAD tooling balls and the corresponding measured screen locations of the is actual tooling balls, transformation matrices, G, M.sub.j may iteratively be determined which map points on the 3D CAD model to 3D points of the part and then map the 3D points of the part to the 2D screen coordinates of each projection image, respectively. This provides a method of determining theoretical correct point locations in a coordinate system fixed with respect to the part, and theoretically correct screen coordinates in a reference frame fixed with respect to the imaging device.
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"2.5 D X-Ray Metrology" by R. Gupta, J. A. Noble, R. I. Hartley, A. M. Schmitz to be Published at the International Conference on Image Processing, to be Held Oct. 22-25, 1995 in Washington, D.C.
"Linear Pushbroom Cameras" by R. I. Hartley, R. Gupta, Presented at The Third European Conference on Computer Vision, Stockholm. Sweden, "Computer Vision--ECCV '94", pp. 555-566.
"X-Ray Metrology for Quality Assurance" by J. A. Noble, R. T. Hartley, J. L. Mundy, J. Farley Presented at the 1994 International Conference on Robotics and Automation, Proc. IEEE International Conference on Robotics and Automation, pp. 1113-1119, San Diego, CA. May 8-13, 1995.
"CAD-Based Inspection Using X-Ray Stereo" by J. A. Noble, R. Gupta, J. L. Mundy, R. I. Hartley, W. Hoffman Presentation to ICRA '95 Nagota, Japan, May 21-27, 1995.
Gupta Rajiv
Hartley Richard I.
Noble Julia A.
Schmitz Andrea M.
General Electric Company
Honig Richard
Snyder Marvin
Willis Davis L.
Zale Lawrence P.
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