Method of aligning objects by detecting a reference picture line therein which has an optically characteristic picture content
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United States of America Patent
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Sep 19, 1989
Grant Date -
N/A
app pub date -
Jun 23, 1987
filing date -
Jun 24, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of aligning objects and in particular, of aligning optically readable disc-shaped information carrier. The objects are preferably optically scanned line-by-line in a direction transverse to their direction of movement. A reference picture line with an optically characteristic picture content is detected to allow alignment relative to known positions. To detect the reference picture line, the picture contents of all the picture lines are compared with each other and the corresponding correlation coefficients are determined. The reference picture line is that picture line whose picture content correlates least with the picture content of any other picture line.
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