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Glossary
© National Instruments Corporation G-3 IMAQ PCI/PXI-1411 User Manual
color space The mathematical representation for a color. For example, color can be
described in terms of red, green, and blue; hue, saturation, and luma; or hue,
saturation, and intensity.
composite video A type of color video transmission where synchronization, luma, and
chroma information are transmitted on one analog signal.
contrast A constant multiplication factor applied to the luma and chroma
components of a color pixel in the color decoding process.
coring The process of eliminating color information in low-color situations (if the
saturation is lower than a predefined value).
CPU Central processing unit.
D
DAQ Data acquisition. (1) Collecting and measuring electrical signals from
sensors, transducers, and test probes or fixtures and inputting them to a
computer for processing. (2) Collecting and measuring the same kinds of
electrical signals with A/D or DIO boards plugged into a computer, and
possibly generating control signals with D/A and/or DIO boards in the
same computer.
dB Decibel. The unit for expressing a logarithmic measure of the ratio of two
signal levels: dB = 20log
10
V1/V2, for signals in volts.
DC Direct current.
default setting A default parameter value recorded in the driver; in many cases, the default
input of a control is a certain value (often 0) that means use the current
default setting.
DMA Direct memory access. A method by which data can be transferred to and
from computer memory from and to a device or memory on the bus while
the processor does something else; DMA is the fastest method of
transferring data to/from computer memory.
DRAM Dynamic RAM.