Method for interpreting a plurality of response marks on a scannable surface
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United States of America Patent
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Jan 27, 1998
Grant Date -
N/A
app pub date -
Feb 24, 1995
filing date -
Sep 17, 1993
priority date (Note) -
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Abstract
To determine a read level threshold for discriminating those response bubbles on a scannable answer sheet intended to be marked from those response bubbles not intended to be marked, an adjustable read level threshold is dynamically determined based on the read levels of a designated pool of response bubbles. Response bubble marks having a darkness read level at or above a threshold level are interpreted to be intended response marks, and different response bubbles in which response marks may be found are assigned different predetermined scoring values.
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