Term
Definition
Pixel
A picture element. Term used to describe the individual light detectors of the CCD sensor in the camera and also the individual light emitters of an LCD video monitor. The least significant digit to which a physical quantity can be read. High resolution does not imply high accuracy. Misalignment of the part with respect to the X and Y axes. This will create measurement errors unless the part is repositioned or the deskew feature of the metrology software redefines the measurement axes. Illumination from below the stage glass. Used for profile or silhouette video edge measurements. A space saving personal computer where all electronics, disk drives and I/O connections are in the same enclosure as the video monitor, which is an LCD color touch-screen. A keyboard and mouse are also included. A lens property where the light from the object stays parallel to the optical axis across the entire field of view, thereby eliminating optical distortion. This can only happen if the entrance aperture of the lens is larger than the field of view, requiring a large and expensive lens. See the figure below. Tetrafluoroethylene, a self-lubricating polymer coating used on precision lead screws. Video Edge Detection, a system where a video camera and digital image processing are used to detect edges or other features.
Resolution
Skew
Substage Lighting
System PC
Telecentric
TFE
VED
Object
Telecentric lens
CCD detector
Telecentric Lens
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