Microscan MS-4X User Manual download pdf (Page 371)

MS-4X Imager User Manual

A-37

Appendices

Half Duplex — A communications system in which signals can travel between devices in

both directions, but not simultaneously.

Histogram — A graphical representation of the frequency of occurrence of each intensity

or range of intensities (gray levels) of pixels in an image. The height represents the number

of observations occurring in each interval.

Host — A computer, PLC, or other device that is used to execute commands and process

data and discrete signals.

Image — Projection of an object or scene onto a plane (i.e. screen or image sensor).

Image Processing (IP) — Transformation of an input image into an output image with

desired properties.

Image Resolution — The number of rows and columns of pixels in an image. A higher

resolution means that more pixels are available per element of the symbol being read.

Examples: 640 x 480 (VGA); 854 x 480 (WVGA); 1280 x 1024 (SXGA); 2048 x 1536

(QXGA).

Image Sensor — A device that converts a visual image to an electrical signal; a CCD or

CMOS array.

Initialize — Implement serial configuration commands into the imager’s active memory.

Input — A channel or communications line. Decoded data or a discrete signal that is

received by a device.

Integration — Exposure of pixels on a CMOS sensor.

IP — See Image Processing.

Ladder Orientation — A linear symbol orientation in which the bars are parallel to the

symbol’s direction of travel.

LED — See Light-Emitting Diode.

Light-Emitting Diode (LED) — A semiconductor device that emits light when conducting

current.

Lens — A transparent piece of material with curved surfaces which either converge or

diverge light rays.

Machine Vision — The automatic acquisition and analysis of images to obtain desired

data for controlling a specific activity.

Multidrop — A communications protocol for networking two or more imagers or other

devices with a concentrator (or controller) and characterized by the use of individual

device addresses and the RS-485 standard.

Noise — The same as static in a phone line or “snow” in a television picture, noise is any

unwanted electrical signal that interferes with the image being read and transferred by the

imager.

Normally Closed — A discrete output state that is only active when open.

Normally Open — A discrete output state that is only active when closed.

Object Plane — An imaginary plane in the field of view, focused by an imager’s optical

system at the corresponding image plane on the sensor.

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Microscan MS-4X User Manual Page 371

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