Product Description
2
P/N 56910COA
Overview
PresencePLUS™ Pixel-Counting Sensor Models P1B65Q/P2B65Q* house a 512 x
384 CMOS pixel array and a programmable microprocessor. Each 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 PresencePLUS™ sensor is configured for trigger input, signal output, lighting
options and other sensor parameters using either the remote controller (Model
PRC1) and/or the PresencePLUS PC software, depending on sensor model. While
the sensor is in operation, the controller or PC may be used to view captured
images and monitor sensor performance.
For more information about programming and operating the
sensor, see page 17.
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.
Gray-scale images are converted to black and white by comparing the value of each pixel to adjustable gray-scale
thresholds
Gray-Scale
Binary
Upper
Threshold
Lower
Threshold
Ignores pixels with a value above
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)
*Model P2B65Q available fall 2000.
56910 (presplus sensor)C0A 8/16/03 11:33 PM Page 2
