Curvature correction and image processing
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United States of America Patent
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Jul 31, 2012
Grant Date -
Mar 19, 2009
app pub date -
Nov 26, 2008
filing date -
Mar 14, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A system and process for reading forms using a curvature distortion correction scheme is disclosed. A model image of a known form is partitioned into sectors defined by at least three alignment marks, and a transfer or correction function for each sector is generated by comparing the locations of alignment marks on a captured unread image of a form to those on a model image. The transfer function is then applied to the other marks within the sector to calculate a correct location of the marks. Each sector is sized to reasonably ensure curvature distortions are handled such that all the marks on a form are properly found and interpreted. Errors may be checked and, if they persist, smaller sectors may be defined and employed, if available.
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