National Instruments IMAQTM - Manual (Page 101)

Glossary
IMAQ Vision for Visual Basic User Manual G-4 ni.com
connectivity-4 Only pixels adjacent in the horizontal and vertical directions are considered
neighbors.
connectivity-8 All adjacent pixels are considered neighbors.
contrast A constant multiplication factor applied to the luma and chroma
components of a color pixel in the color decoding process.
convex hull The smallest convex polygon that can encapsulate a particle.
convex hull function Computes the convex hull of objects in a binary image.
convolution See linear filter .
convolution kernel 2D matrices, or templates, used to represent the filter in the filtering
process. The contents of these kernels are a discrete two-dimensional
representation of the impulse response of the filter that they represent.
D
Danielsson function Similar to the distance functions, but with more accurate results.
determinism A characteristic of a system that describes how consistently it can respond
to external events or perform operations within a given time limit.
digital image An image f (x, y) that has been converted into a discrete number of pixels.
Both spatial coordinates and brightness are specified.
dilation Increases the size of an object along its boundary and removes tiny holes in
the object.
driver Software that controls a specific hardware device, such as an IMAQ or
DAQ device.
E
edge Defined by a sharp transition in the pixel intensities in an image or along an
array of pixels.
edge contrast The difference between the average pixel intensity before and the average
pixel intensity after the edge.
edge detection Any of several techniques to identify the edges of objects in an image.