Glossary – National Instruments NI-IMAQ User Manual
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NI-IMAQ for IEEE-1394 Cameras User Manual
Glossary
A
acquisition window
The image size specific to a video standard or camera resolution.
active pixel region
The region of pixels actively being stored. Defined by a pixel start [relative
to the horizontal synchronization signal(HSYNC)] and a pixel count.
address
Value that identifies a specific location (or series of locations) in memory.
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.
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 denotes
the amount of memory required to store one byte of data.
buffer
Temporary storage for acquired data.
C
cache
High-speed processor memory that buffers commonly used instructions or
data to increase processing throughput.
chroma
The color information in a video signal.