N
National Institute of Standards and Technology (NIST)
A physical sciences laboratory and a non-regulatory agency of the United States Department of Commerce. Its mission is to promote innovation and industrial competitiveness. NIST's activities are organized into laboratory programs that include nanoscale science and technology, engineering, information technology, neutron research, material measurement, and physical measurement.
newton (N)
The International System of Units (SI) derived unit of force. A newton is defined as the force required to accelerate an object with a mass of 1 kilogram 1 meter per second per second (1 kg ⋅ m/s).
NIST
See National Institute of Standards and Technology.
P
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.
pixel
A picture element. Term used to describe the individual light detectors of the sensor in the camera and also the individual light emitters of an LCD video monitor.
profile light
Lighting applied from the back of the object so as to create a silhouette or contour when the object is viewed by the camera.
R
radio-frequency interface (RFI)
The radiation or conduction of radio frequency energy ( or electronic noise) produced by electrical and electronic devices at levels that interfere with the operation of adjacent equipment.
See also , electromagnetic interface (EMI).
repeatability
The three-sigma variation of multiple readings on the same object that is positioned at multiple locations across the field of view.
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