Automated dirt counters for pulp inspection exists, and
are usually based on a line-scan sensor or real-time analog
light sensors. These are quite sensitive to noise, yielding
false positives. A new scheme for real-time pulp inspection
described here, which uses a two-dimensional image captured
using synchronized stroboscopic illumination; software examines
the image for dirt, and using 2D shape analysis high success
rates can be achieved with a lower rate of false positives.
The system runs on a PC using Windows, and has been field tested
at Howe Sound. This document is a description of the use of
PAVIS, the software for pulp inspection.
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