Matrox 4Sight User Manual page 199

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Progressive scanning
Describes a transfer of data in which the lines of the source
input device are written sequentially into the destination
buffer.
Also known as non-interlaced. See also interlaced scanning.
Protocol
A set of standards (rules/formats) for transmitting
information "packets" between computer software and
hardware devices. Information packets are structured
according to the standards of a protocol. On a network, the
data link or Media Access Control protocol standard, such as
the CSMA/CD, provides the access method, and TCP/IP
provides the control and routing method to transmit (move)
information packets.
PSG
Programmable synchronization generator. It has various
functions related to video synchronization and control. For
example, it supplies feedback signals to the PLL, and is fully
responsible for the sampling clock value.
RAMDAC
Random access memory digital-to-analog converter. A digital
to analog converter that includes static RAM for use as a
look-up table.
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 the minimum 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.