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54 Appendix A: Glossary
• 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
.
• Latency
The time from when a command is sent to when its operation is started.
• Line valid synchronization signal
The signal that indicates the start and end of a line (row).
See also
data valid
and
frame valid synchronization signal
.
• LVDS
Low-voltage differential signalling
. LVDS offers a general-purpose, high bandwidth
interface standard for serial and parallel data interfaces that require increased
bandwidth at high speed, with low noise and power consumption.
• Real-time processing
The processing of an image as quickly as the next image is grabbed.
Also known as
live processing
.
• Rotary encoder
A device used to convert the angular position of a shaft or axle to an analog or
digital code.