Banner PresencePLUS P4 COLOR Series - Manual (Page 378)

incident light
The light falling directly on an object.
inverse square law
The exponential relationship between increased distance and
decreased light intensity.
iris
An adjustable aperture built into a Sensor lens to permit control
of the amount of light passing through the lens.
L
LED
Acronym for Light-Emitting Diode.
M
mask
A pattern used to eliminate portions of another pattern. Regions
of an image at a constant value, usually white or black, form
the mask.
N
noise
Irrelevant or meaningless data resulting from various causes
unrelated to the source of data being measured or inspected;
random undesirable video signals.
O
ocr
Acronym for Optical Character Recognition. Recognition of
each character in a string by a vision system.
ocv
Acronym for Optical Character Verification. Verify a string
by a vision system.
P
parallax
The difference in appearance or position of an object when
viewed from two different locations.
photon
A particle of light. A quantum of electromagnetic energy
moving at the speed of light.
pincushion distortion
A visual effect where the sides of an image appear to bulge
inward on all sides like a pincushion. Caused by an increase
in effective magnification, as points in the image move away
from the image center.
pixel
Acronym for picture element.
polarization
The restriction of the vibrations of light or magnetic field
vectors to one plane.
polarized lighting
The use of polarizing filters to remove specular reflections
from a scene to be viewed. Typically, one polarizing filter is
placed in front of the light source and a second filter is placed
over the receiver with the two filters offset in their polarizing
direction by 90 degrees.
preprocessing
Enhancement, transformation, or filtering of images before
processing.
PresencePLUS ® P4 OMNI/OMNI 1.3/OMNI Color 378