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122 Appendix G: Glossary
■ Frame
A single image grabbed from a video camera.
■ Frame buffer
A frame buffer is a dedicated storage area often used for data
transfers between devices of differing speeds. For example,
since a computer sends out data faster than a screen can
display it, the data is temporarily stored in the frame buffer.
The buffer is generally thought of as a two-dimensional
surface with a certain pixel depth.
■ Grab
To acquire an image from a camera.
■ 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.
■ Host
In general, Host refers to the principal CPU in one’s
computer.
■ 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.