Microscan MS-4X User Manual download pdf (Page 370)

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MS-4X Imager Us

er Manual

Glossary of Terms

Edge Enhancement — Image processing method to strengthen high-spatial frequencies

in the image.

EPROM — See Erasable Programmable Read-Only Memory.

Embedded Memory — Onboard memory device such as EPROM or flash.

End of Read Cycle — The time or condition at which the imager stops expecting symbol

information to decode.

Erasable Programmable Read-Only Memory (EPROM) — A memory chip that retains

data when its power supply is turned off; “non-volatile memory”.

External Edge — Allows a read cycle to be initiated by a trigger signal from an object

detector when it detects the appearance of an object (rising edge). The read cycle ends

with a good read, a timeout, or a new trigger.

External Level — Allows a read cycle to be initiated by a trigger signal from an object

detector. The read cycle ends when the object moves out of the detector’s range.

Falling Edge — A change of state (to inactive) associated with a level trigger.

Field-Programmable Gate Array (FPGA)

— A semiconductor device containing programmable

interconnects and logic components.

Fill Factor — Percentage of pixel area used for light collection.

Firmware — Software hard-coded in non-volatile memory (ROM), and closely tied to

specific pieces of hardware.

Fixed Symbol Length — Increases data integrity by ensuring that only one symbol length

will be accepted.

Focal Distance — In camera-based vision, the distance from the front of the camera to

the object being viewed. (In optics, the distance from the lens to the focal plane.)

Focal Plane — Usually found at the image sensor, it is a plane perpendicular to the lens

axis at the point of focus (–).

Focus — Any given point in an image at which light converges; the focal point.

FPGA — See Field-Programmable Gate Array.

Frame — The total area captured in an image sensor while the video signal is not blanked.

Frame Grabber — A device that interfaces with a camera and, on command, samples the

video, converts the sample to a digital value and stores that in a computer's memory.

Front End System — The object, illumination, optics and imager blocks of a vision system.

Includes all components useful to acquire a good image for subsequent processing.

Full Duplex — A communications system in which signals can travel simultaneously

between devices.

Gain — The amount of energy applied to pixel gray scale values prior to output, expressed

in dB; optimal signal strength.

Good Read — A decode. The successful scanning and decoding of the information

encoded in a bar code symbol.

Gradient — The rate of change of pixel intensity (first derivative).

Gray Scale — Variations of values from white, through shades of gray, to black in a digitized

image with black assigned the value of zero and white the value of one.

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Microscan MS-4X User Manual Page 370

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