A-14
MicroHAWK Engine Integration Guide
Glossary of Terms
Appendix G — Glossary of Terms
Aberration
— The failure of an optical lens to produce an exact point-to-point correspondence
between the object and its resulting image. Various types are chromatic, spherical, coma,
astigmatism and distortion.
Absorption
— The loss of light of certain wavelengths as it passes through a material and
is converted to heat or other forms of energy. (–)
Active Illumination
— Lighting an area with a light source coordinated with the acquisition
of an image. Strobed flash tubes and pulsed lasers are examples.
Ambient Light
— Light which is present in the environment of the imaging front end of a
vision system and generated from outside sources. This light, unless used for actual illumination,
will be treated as background
Noise
by the vision system.
Analog
— A smooth, continuous voltage or current signal or function whose magnitude
(value) is the information.
Analog-to-Digital Converter (A/D Converter
or
ADC)
— A device that converts an
analog voltage or current signal to a discrete series of digitally encoded numbers (signal)
for computer processing.
Application-Specific Integrated Circuit (ASIC)
— An integrated circuit that is customized
for a particular kind of use, rather than general use. All vision system elements including
firmware can be integrated into one ASIC.
Architecture
— The hardware organization of a vision system designed for high speed
image analysis.
Aspect Ratio
— The ratio between the height and width of a sensor or display. Found by
dividing the vertical number of pixels (height) by the horizontal number of pixels (width)
leaving it in fractional format.
Automatic Gain Control (AGC)
— Adjustment to signal strength that seeks to maintain a
constant level regardless of the distance between a reader and symbol.
Auxiliary Port
— RS-232 connection to an auxiliary terminal or device for remote viewing.
Blooming
— A situation in which too many photons are being produced to be received by
a pixel. The pixel overflows and causes the photons to go to adjacent pixels. Blooming is
similar to overexposure in film photography, except that in digital imaging, the result is a
number of vertical and/or horizontal streaks appearing from the light source in the picture.
Baud Rate
— The number of discrete signal events per second; bits per second.
Capture
— The act of acquiring and storing video images in an imager or host computer.
Also, the image captured.
Charge-Coupled Device (CCD)
— A semiconductor device with an array of light-sensitive
elements that converts light images into electrical signals.
Check Character
— A Modulus 43 or Modulus 10 character that is added to encoded
symbol data for additional data integrity.
Complementary Metal Oxide Semiconductor (CMOS)
— Like CCDs, CMOS imagers
include an array of photo-sensitive diodes, one diode within each pixel. Unlike CCDs, however,
each pixel in a CMOS imager has its own individual amplifier integrated inside.
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Страница 108: ...4 28 MicroHAWK Engine Integration Guide Entering ASCII Characters as Hex Values...
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