National Instruments IMAQ Vision for Measurement Studio - Manual (Page 90)

Glossary
© National Instruments Corporation G-3 IMAQ Vision for LabWindows/CVI User Manual
brightness (1) A constant added to the red, green, and blue components of a color pixel
during the color decoding process. (2) The perception by which white
objects are distinguished from gray and light objects from dark objects.
buffer Temporary storage for acquired data.
C
caliper (1) A function in IMAQ Vision Builder that calculates distances, angles,
circular fits, and the center of mass based on positions given by edge
detection, particle analysis, centroid, and search functions.
(2) A measurement function that finds edge pairs along a specified path in
the image. This function performs an edge extraction and then finds edge
pairs based on specified criteria such as the distance between the leading
and trailing edges, edge contrasts, and so forth.
center of mass The point on an object where all the mass of the object could be
concentrated without changing the first moment of the object about any
axis
centroid (1) The average of the x-coordinates and y-coordinates of a binary image
or a blob in the image. The centroid of a blob may lie outside the blob.
(2) The weighted average of the x-coordinates and y-coordinates in a
grayscale image, where the weights are determined by the pixel values in
the image.
character recognition The ability of a machine to read human-readable text.
chroma The color information in a video signal.
chromaticity The combination of hue and saturation. The relationship between
chromaticity and brightness characterizes a color.
circle function Detects circular objects in a binary image.
closing A dilation followed by an erosion. A closing fills small holes in objects
and smooths the boundaries of objects.
clustering A technique where the image is sorted into a discrete number of classes.
Each class contains pixels that fall within a distinct range of grayscale
values. The barycenter is determined for each class. This process is
repeated until a value is obtained that represents the center of mass for each
phase or class.