pixel
A picture element. Term used to describe the individual light detectors of the CCD sensor in the camera and the individual light emitters of an LCD video monitor. R
resolution
The least significant digit to which a physical quantity can be read. High resolution does not imply high accuracy. S
SD (secure digital) card
A type of removable memory card used to read and write large quantities of data in mobile electronics, cameras, and smart devices.
skew
Misalignment of the part with respect to the X and Y axes. This misalignment creates measurement errors unless the part is repositioned or the de-skew feature of the metrology software redefines the measurement axes.
squareness
The alignment of the camera relative to the motion of the metrology stage. If the camera is misaligned (out of square), the image will drift diagonally as the stage position is moved along one axis.
substage lighting
Illumination from below the stage glass. Used for profile or silhouette video edge measurements. V
VED
See video edge detection.
VESA
A VESA mounting interface – commonly referred to as VESA mount – is an interface standardized by the Video Electronics Standards Association (VESA) that is used to mount a monitor to a wall mount or monitor arm. It comes in the form of four screw holes arranged in a square pattern at the back of the monitor.
video edge detection (VED)
A system where a video camera and digital image processing are used to detect edges or other features. Z
zoom optics
Optics which can change magnification based on a user selection. Zoom control can be manual or motorized, depending on the metrology system.
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