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124 Appendix G: Glossary
■ Real-time processing
The processing of an image as quickly as the next image is
grabbed.
Also known as live processing.
■ Reference levels
The zero and full-scale levels of an analog-to-digital
converter. Voltages below a black reference level are converted
to a zero pixel value; voltages above a white reference level
are converted to the maximum pixel value. Together with the
analog gain factor, the reference levels affect the brightness
and contrast of the resulting image.
■ RGB
A color space that represents color using the primary colors
(red, green and blue) as components.
■ Synchronous function
A function that does not return control to the caller until it
has finished executing.
See also asynchronous function.
■ Trigger
A signal that allows image acquisition to be synchronized to
external events. If supported, a digitizer can operate in one
of two modes upon receiving a trigger:
❐ Asynchronous reset mode: If your digitizer supports and
uses this mode, the camera is reset to begin a new frame
when the trigger signal is received.
❐ Next valid frame/field mode: If your digitizer supports and
uses this mode, the digitizer will grab the next valid frame
or field.
■ Vertical sync
The part of a video signal that indicates the end of a frame
and the start of a new one.
See also horizontal sync.