Polygon-based technique for the automatic classification of text and graphics components from digitized paper-based forms
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United States of America Patent
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Sep 17, 1991
Grant Date -
N/A
app pub date -
May 21, 1990
filing date -
May 21, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polygon-based graphics/text separation method is comprised of two sequential processes. First a raster to contour vector conversion step is used to convert a digitized bitmap into a collection of simple polygons. Next a component classification process is used to extract six particularly defined features of each of the individual polygon-based components to enable the separation of graphics and text polygons. Graphical polygons are further classified into four subclasses. Textual polygons are grouped into polygon strings (text strings). Each string contains a sequence of segmented character contour polygons which is ready for an optical character recognition algorithm to convert them into computer understandable ASCII characters.
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