Microscan QX Hawk Manual de usuario descargar pdf (Pagina 458)

A-142 QX Hawk Industrial Imager User Manual

Glossary of Terms

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.

Output — A channel or communications line. Data or discrete signals that are transmitted

or displayed by a device.

Parity — An error detection routine in which one data bit in each character is set to 1 or 0

so that the total number of 1 bits in the data field is even or odd.

Picket Fence Orientation — A linear symbol orientation in which the bars are perpendicular

to the symbol’s direction of travel.

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