Glossary
IMAQ Vision for LabWindows/CVI User Manual
G-10
ni.com
image visualization
The presentation (display) of an image (image data) to the user.
imaging
Any process of acquiring and displaying images and analyzing image data.
IMAQ
Image Acquisition.
inner gradient
Finds the inner boundary of objects.
inspection
The process by which parts are tested for simple defects such as missing
parts or cracks on part surfaces.
inspection function
Analyzes groups of pixels within an image and returns information about
the size, shape, position, and pixel connectivity. Typical applications
include quality of parts, analyzing defects, locating objects, and sorting
objects.
instrument driver
A set of high-level software functions, such as NI-IMAQ, that control
specific plug-in computer boards. Instrument drivers are available in
several forms, ranging from a function callable from a programming
language to a virtual instrument (VI) in LabVIEW.
intensity
(1) The sum of the Red, Green, and Blue primary colors divided by three,
(
Red
+
Green
+
Blue
)/3 in a color image. (2) The gray-level value of a pixel
in a grayscale image.
intensity calibration
Assigning user-defined quantities, such as optical densities or
concentrations, to the gray-level values in an image.
intensity profile
The gray-level distribution of the pixels in an ROI of an image.
intensity range
Defines the range of gray-level values in an object of an image.
intensity threshold
Characterizes an object based on the range of gray-level values in the
object. If the intensity range of the object falls within the user-specified
range, it is considered an object. Otherwise it is considered part of the
background.
interpolation
The technique used to find values in between known values when
resampling an image or array of pixels.
IRE
A relative unit of measure (named for the Institute of Radio Engineers).
0 IRE corresponds to the blanking level of a video signal, 100 IRE to the
white level. Note that for CCIR/PAL video, the black level is equal to the
blanking level or 0 IRE, while for RS-170/NTSC video, the black level is
at 7.5 IRE.
