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OVERVIEW
The PresencePLUS™Pixel-Counting Sensor Model P1B65Q houses a
512 x 384 CMOS pixel array and a programmable microprocessor. The
sensor captures a gray-scale image, converts the image to binary format
based on adjustable gray-scale thresholds, counts the number of white or
black pixels, and judges the image as “PASS” or “FAIL” by comparing the
counts to reference counts.
An image is captured in response to a signal from a user-supplied trigger
input device. The trigger device is typically a presence-sensing device
such as a photoelectric sensor that delivers an input signal coincident with
the passage of the leading or trailing edge of an object to be inspected.
The binary value of each pixel is determined by two adjustable gray-scale
thresholds. The lower threshold defines the division between “light” and
“dark”. The sensor counts all light pixels as white and all dark pixels as
black. The upper threshold defines the limit above which pixels will be
ignored. The sensor may be set to count either black or white pixels and to
accept a percentage above or below reference pixel counts.
The remote PresencePLUS™Controller Model PRC1 is used to configure
trigger input, signal output, and lighting options and to program all other
sensor parameters. While the sensor is in operation, the controller may be
used to view captured images and monitor sensor performance.
For more information about programming and
operating the sensor, see page 14.
Gray-scale images are converted to black and white by comparing the value of each pixel to
adjustable gray-scale thresholds
Product Description
Gray-Scale Binary Upper
Threshold
Lower
Threshold
Ignorespixels with a valueabove
this threshold.
Counts pixels with a value below
this threshold as black.
Counts pixels with a value between
these thresholds as white.
255 (White)
0 (Black)
Application Examples
The PresencePLUS sensor is a solution to many
inspection applications where a defect can occur
anywhere within the sensor’s field of view, and where a
configuration of multiple discrete sensors is either cost-
prohibitive or mechanically impractical. The inspection
examples shown on the next page illustrate a few
application possibilities.
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