National Instruments Image Acquisition Software User Manual
Page 53
Glossary
G-2
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National Instruments Corporation
active line region
the region of lines actively being stored; defined by a line start (relative to
VSYNC) and a line count
active pixel region
the region of pixels actively being stored; defined by a pixel start (relative
to HSYNC) and a pixel count
A/D
analog-to-digital
ADC
analog-to-digital converter—an electronic device, often an integrated
circuit, that converts an analog voltage to a digital number
address
character code 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 a specific customer
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 sync
signal and the active video information
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