On-line dirt counter

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United States of America Patent

PATENT NO 5402228
SERIAL NO

07938034

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Abstract

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The two-dimensional medium-pass filter principle is used to acquire a sharpened image initially In practice the sharpened image is obtained from the difference of a linear array signal of a partially out-of-focus image from another linear array signal of the same image but in focus. Integrated intensity of dirt specks higher than a user selected threshold are measured and accumulated. Each integrated intensity value is converted into its corresponding speck size with the use of a predefined fined look-up table. The counter generates a dirt speck histogram and statistical data within a preselected time interval or area coverage.

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Patent Owner(s)

Patent OwnerAddress
PULP AND PAPER RESEARCH INSTITUTE OF CANADAQUEBEC CAN QUEBEC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Jordan, Byron D Pointe Claire, CA 2 4
Nguyen, Nam G Montreal, CA 2 4

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