Microscan MS-4X User Manual download pdf (Page 368)

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MS-4X Imager Us

er Manual

Glossary of Terms

Appendix K — 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.

ADC — See Analog-to-Digital Converter.

A/D Converter — See Analog-to-Digital Converter.

AGC — See Automatic Gain Control.

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.

ASIC — See Application-Specific Integrated Circuit.

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.

CCD — See Charge-Coupled Device.

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Microscan MS-4X User Manual Page 368

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