38 Appendix A: Glossary
•Frame
A single image grabbed from a video source.
•GPU
Graphics Processing Unit. The component used to output a visual signal to a display
device. It is a specialized microprocessor that offloads and accelerates graphics
rendering from the central processing unit (CPU).
•Grab
To acquire an image from a video source.
• Graphics Processing Unit
See GPU.
•High-definition
Video format offering high image resolution, typically at 1280x720 (720p) or
1920x1080 (1080i/1080p) pixel resolution, where p is for progressive scanning
and i is for interlaced scanning.
• 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.
• Host
In general, Host refers to the principal CPU in one’s computer.
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