3D | Features | Principles
of Operation | Technical
BML 3D / Principles of Operation
SENSOR FOR STAMP DETECTION
THE AUSTRIAN CONTRIBUTION TO AUTOMATIC LETTER SORTING SYSTEMS
The scanner emits side light to the bypass letters. This makes the
serrations visible which appears as a light/shadow pattern. The
scan line is projected by an objective lens on a CCD sensor. The
analogue output signal of the CCD is reduced and digitized to a
bit stream pattern. This pattern is compared with adjustable reference
patterns. At the end of the scan window the decision "stamp
detected/rejected" is made and the proper information is putout
on the machine interface.
Printed Code detection
Instead of stamps printed codes can be detected too if placed in
the postage zone.
Red ink impressions are detected if an at least 8mm long printed
code is part of the franking impression. A blue filter is built
in to increase the contrast of red patterns.
An optical reflective sensor emitting visible light is located in
the front panel of the BML3D. The sensor is scanning the bypass
letter point-shaped. The signal obtained from scanning is converted
to a digital light/dark pattern. This signal is available at the
sensor interface for external data processing. External data processing
is done by the PRIM unit equipped with the barcode Software.
BML 3D | Features
| Principles of Operation
| Technical Data |