Method for determining the scale of an observation area

Details Method for determining the scale of an observation area Method for determining the scale of an observation area

2008-01-08

2008-01-08

Porta, David (Department: 2884)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

Reexamination Certificate

active

10509043

ABSTRACT:
The invention relates to a method in the control of the quality or the condition of a fibre web (21) on the basis of optical imaging diagnostics, wherein the fibre web (21) under examination and/or means (22, 23) relating to the processing of the fibre web are monitored with at least one optical imaging measuring device (1to N). According to the method, the scale of the observation area of said at least one imaging measuring device (1to N) is calibrated, when said measuring device is taken into use, by means of one or more calibration objects placed in the observation area of the measuring device, to correct the perspective error caused by the position between said measuring device and the object (21, 22, 23) observed by it.

REFERENCES:
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patent: 4491868 (1985-01-01), Berridge, Jr. et al.
patent: 5774177 (1998-06-01), Lane
patent: 5821990 (1998-10-01), Rudt et al.
patent: 5845002 (1998-12-01), Heck et al.
patent: 6040853 (2000-03-01), Delagnes et al.
patent: 1 033 881 (2000-09-01), None
patent: 1 096 777 (2001-05-01), None
patent: WO 01/21516 (2001-03-01), None

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