196 Appendix E: Glossary
■ Frame
A single image grabbed from a video camera.
■ Frame buffer
A frame buffer is a dedicated storage area used for display.
Since a computer sends out data faster than a screen can
display it, the data is temporarily stored in the frame buffer.
Matrox imaging boards that have a display section typically
have two frame buffer surfaces: a dedicated or dynamically
allocated main (underlay) surface and an overlay (VGA)
surface. Separate VGA boards typically have only one frame
buffer surface, a VGA frame buffer surface.
If keying is enabled, those areas of the overlay frame buffer
surface that have a specified color allow the underlay frame
buffer surface to show through.
■ Full duplex mode
A network device that can send and receive information
simultaneously. For example, a switch can operate in full
duplex mode.
■ Grab
To acquire an image from a camera.
■ Half duplex mode
A network device that can only send or receive data, but not
do both simultaneously. For example, all hubs operate in half
duplex mode.
■ Horizontal sync
The part of a video signal that indicates the end of a line and
the start of a new one.
See also vertical sync.
■ HSL
A color space that represents color using components of hue,
saturation, and luminance. The hue component describes the
actual color of a pixel. The saturation component describes
the concentration of that color. The luminance component
describes the combined brightness of the primary colors.
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