S-3
Appendices
V440-F C-Mount Code Reader User Manual
S
Decode —
A
Good Read
. The successful interpretation and output of the information encoded in a symbol.
Default —
Restores
ROM
or flash settings, initializes serial commands and resets all counters.
Delimited —
A delimited command or field is bracketed by predefined characters.
Decode Rate —
The number of good reads per second ahieved by an imager.
Dark Field Illumination —
Lighting of objects, surfaces, or particles at very shallow or low angles, so
that light does not directly enter a reader’s optical hardware.
Depth-of-Field —
The in-focus range of an imaging system. Measured from the distance behind an
object to the distance in front of the object with all objects appearing in focus.
Diffused Lighting —
Scattered soft lighting from a wide variety of angles used to eliminate shadows
and specular glints from profiled, highly reflective surfaces.
Digital-to-Analog Converter (DAC) —
A
VLSI
circuit used to convert digitally processed images to
analog for display on a monitor.
Digital Imaging —
Conversion of an image into pixels by means of an
Analog-to-Digital Converter
where the level of each pixel can be stored digitally.
Digital Signal Processor (DSP) —
A
VLSI
chip designed for ultra-high-speed arithmetic processing.
Often imbedded in a vision engine.
Discrete I/O —
Inputs and outputs characterized by discrete signal transitions from one voltage level to
another so that digital switching can occur.
Direct Memory Access (DMA) —
A capability provided by some computer bus architectures that
allows data to be sent directly to memory from an attached device.
Dynamic Range —
The difference between the minimum and maximum thresholds of discernible
images; the amount of usable signal.
Edge Enhancement —
Image processing method to strengthen high-spatial frequencies in the image.
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.
Frame —
The total area captured in an image sensor while the video signal is not blanked.
Summary of Contents for V440-F
Page 1: ...Z452 E 01 84 9000440 02 Rev A V440 F C Mount Code Reader User Manual...
Page 31: ...1 Overview of WebLink Interface 1 16 V440 F C Mount Code Reader User Manual...
Page 139: ...4 Setup 4 76 V440 F C Mount Code Reader User Manual...
Page 183: ...7 Terminal 7 6 V440 F C Mount Code Reader User Manual...
Page 243: ...Appendices A 22 V440 F C Mount Code Reader User Manual...
Page 249: ...Appendices C 4 V440 F C Mount Code Reader User Manual...
Page 283: ...Appendices E 10 V440 F C Mount Code Reader User Manual...
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