Glossary - Banner PresencePLUS PRC1 Instruction Manual

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Contrast
The range of difference between white and
black values.
Exposure time (Exposure)
The length of time the pixel array is exposed
to light during an image capture, specified in
milliseconds (ms).
FAIL
The judgment results are not acceptable
based on judgment criteria as taught.
Field of view
The image area captured within the sensor's
pixel array.
Gray scale
A range of shades from pure white to pure
black.
Gray-scale thresholds
Two adjustable values between 0 (black) and
255 (white) representing two shades of gray
within a 256-level gray-scale.
The sensor judges each pixel as black or
white according to where its value falls in
relation to the upper threshold (highest
number) and lower threshold (lowest
number) (see Appendix B on page 33).
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Page 35
Judgment
The process the sensor uses to determine
the outcome (PASS, FAIL, Fail High, or Fail
Low) of the image capture by comparing the
pixel count of the image to reference values.
Latched output
When active, the output remains active until
a condition occurs which makes the output
inactive (see Figure 1 on page 32).
Mask
A defined area within the ROI that is ignored
during judgment.
Output delay
The amount of time in milliseconds between
the instant the sensor is ready to start the
output signal to the instant it starts. The
DELAY option adds a specified amount of
time after the 50 msec default sensor
response time has elapsed (see Figure 3 on
page 32).
Output type
Refers to whether an output signal is
continuous (Latched) or limited (Pulsed).
See Latched output
U.S.A.

Glossary

PASS
The judgment results are acceptable based
on judgment criteria as taught.
Pixel
The smallest "picture element" of an image
for which the sensor determines an average
brightness value. Each pixel within the
sensor's array is a discrete photosensitive
cell that can collect and hold a photo charge.
Pixel array (Array)
The area on the sensor that captures the
image – a
Pulsed output
When active, the output remains active for a
user-defined duration or until the next valid
trigger (see Figure 2 on page 32).
Pulse width
The duration of a pulsed output signal
specified in milliseconds.
Region of interest (ROI)
A defined area of the captured image within
the pixel array that is judged. The image
outside of an ROI is ignored.
and Pulsed output .
REFERENCE
512 x 384 pixel grid.
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