Glossary
G-2
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active line region
The region of lines actively being stored. Defined by a line start (relative to
the vertical synchronization signal) and a line count.
active pixel region
The region of pixels actively being stored. Defined by a pixel start (relative
to the horizontal synchronization signal) and a pixel count.
ADC
Analog-to-digital converter. An electronic device, often an integrated
circuit, that converts an analog voltage to a digital value.
address
Value that identifies a specific location (or series of locations) in memory.
ANSI
American National Standards Institute
antichrominance filter
Removes the color information from the video signal.
API
Application programming interface.
AQ_DONE
Signals that the acquisition of a frame or field is completed.
AQ_IN_PROGRESS
Signals that the acquisition of video data is in progress.
area
A rectangular portion of an acquisition window or frame that is controlled
and defined by software.
array
Ordered, indexed set of data elements of the same type.
ASIC
Application-Specific Integrated Circuit. A proprietary semiconductor
component designed and manufactured to perform a set of specific
functions for specific customer needs.
aspect ratio
The ratio of a picture or image’s width to its height.
B
b
Bit. One binary digit, either 0 or 1.
B
Byte. Eight related bits of data, an eight-bit binary number; also used to
denote the amount of memory required to store one byte of data
back porch
The area of the video signal between the rising edge of the horizontal
synchronization signal and the active video information.
black reference level
The level that represents the darkest an image can get. See also white
reference level.
