10. Glossary The following terms may have additional meanings. The definitions that follow are in the context of the KineMic video metrology systems.
Accuracy
The maximum error that the system will produce when measuring a true standard. A direction which allows movement and along which dimensions can be measured. In KineMic systems, the X-axis is horizontal from left to right, and the Y-axis is from front to back, and the Z-axis is from bottom to top. An alternative support mechanism for the optical head. It allows the head to swing out sideways to reach otherwise unreachable surfaces. A condition where the parts of the video image are distorted by oversatu- rated bright regions, making illuminated regions appear larger than they really are. Charge Coupled Device. The solid-state image sensing element of the video camera. Optical image distortion at the CCD sensor across the maximum field of view. Expressed in percent for the dimensional error along one axis divided by the true dimension. A computer aided design (CAD) data file format developed by Autodesk, Inc. and now also used by other companies for the export and import of CAD data. The condition which provides the sharpest image. Achieved by optimizing the distance between the object and imaging optics.
Axis
Boom Stand
Blooming
CCD
Distortion
DXF
Focus
FOV Field of View. The region of the metrology stage being viewed by the camera and displayed on the video monitor. FOV Measurement A video measurement performed in a single field of view without moving the stage or camera. Illumination, Front Lighting applied to the object from the same side as the camera so that surface features can be viewed on the video monitor. Illumination, Back Lighting applied from the back of the object so as to create a silhouette when the object is viewed by the camera. Mag Abbreviation for magnification. Magnification, Lens In a vision metrology system, the image size in the CCD plane divided by the corresponding object size. Magnification, Image Magnification on monitor. Image size on the video monitor divided by the corresponding object size. Same as lens magnification in a properly adjusted optical comparator. Parcentricity The condition where a feature remain at the optical center of the video image throughout the magnification range of zoom optics. Parfocality The condition where the video image remains in focus as the magnification is adjusted from highest to lowest with zoom optics.
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