Banner PresencePLUS P4 Series - Manual (Page 247)

A
A/D converter
Acronym for Analog-to-Digital Converter, an electronic device
that converts data from analog form to digital representation.
Abs (Absolute Value)
Abs (Absolute value) returns Abs(X1). The absolute value of
an operand is its unsigned magnitude. For example, Abs(-1.5)
and Abs(1.5) both return 1.5
acquisition
The manner in which outside information is brought into an
analysis system, as in an image acquisition. Generally
involves A/D conversion.
adaptive threshold
A control method in which a threshold is adjusted based on
scene content.
algorithm
A set of well-defined rules or procedures for solving a problem
in a finite number of steps, or providing an output from a
specific set of inputs. Usually implemented as a computer
program.
ambient light
Light that is present in the environment but not provided by
the sensing system.
angle of incidence
The angle between the axis of an impinging light beam and
the axis perpendicular to the sample surface.
angle of view
1. The angle formed between two lines drawn from the most
widely separated points in the object plane to the center
of the lens.
2. The angle between the axis of observation and
perpendicular to the specimen surface.
aperture
The size of a lens opening.
ASCII
Acronym for American Standard Code for Information
Interchange. An 8-bit coded character set used to represent
alphanumeric, punctuation, and certain special control
characters.
B
backlighting
A condition where the light reaching the image sensor does
not reflect from the surface of the object, but comes from
behind the objects or area of interest. Backlighting produces
a silhouette of the work piece.
band-eliminator filter
A filter that suppresses a given range of frequencies,
transmitting only those above and below that band.
bandpass
The specific range of frequencies or wavelengths, passing
through a device. Typically measured between points equal
to 50% of maximum amplitude.