National Instruments IMAQ Vision for Measurement Studio - Manual (Page 101)

Glossary
IMAQ Vision for LabWindows/CVI User Manual G-14 ni.com
Nth order filter Filters an image using a nonlinear filter. This filter orders (or classifies)
the pixel values surrounding the pixel being processed. The pixel being
processed is set to the Nth pixel value, where N is the order of the filter.
number of planes
(in an image) The number of arrays of pixels that compose the image. A gray-level or
pseudo-color image is composed of one plane, while an RGB image is
composed of three planes (one for the red component, one for the blue,
and one for the green).
O
object A connected region or grouping of pixels in an image in which all pixels
have the same intensity level. Objects are also referred to as blobs or
particles.
offset The coordinate position in an image where you want to place the origin of
another image. Setting an offset is useful when performing mask
operations.
opening An erosion followed by a dilation. An opening removes small objects and
smooths boundaries of objects in the image.
operators Allow masking, combination, and comparison of images. You can use
arithmetic and logic operators in IMAQ Vision.
optical character
verification A machine vision application that inspects the quality of printed characters.
optical representation Contains the low-frequency information at the center and the high-
frequency information at the corners of an FFT-transformed image.
outer gradient Finds the outer boundary of objects.
overlay ROIs, text, and bitmaps that you can place on top of a displayed image to
annotate it without modifying it.
P
palette The gradation of colors used to display an image on screen, usually defined
by a color lookup table.