106 Appendix A: Glossary
• Gain level
The factor by which an analog input signal is scaled. The gain affects the brightness
and contrast of the resulting image.
• Grab
To acquire an image from a video source.
• Horizontal blanking period
The portion of a video signal after the end of a line and before the beginning of
a new line. During this period, the video signal is "blank".
See also vertical blanking period.
• Horizontal synchronization signal
The part of a video signal that indicates the end of a line and the start of a new one.
See also vertical synchronization signal.
• Interlaced scanning
Describes a transfer of data in which the odd-numbered lines of the source are
written to the destination buffer first, and then the even-numbered lines (or
vice-versa).
See also progressive scanning.
• Latency
The time from when an operation is started to when the final result is produced.
• LUT mapping
Lookup table mapping. A point-to-point operation that uses a table to define a
replacement value for each possible pixel value in an image.
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