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How a Recognizer Works
There are two techniques for recognizing handwriting, called bitmap and vector recognition.
Bitmap recognition attempts to match an ink image with a record of known
character images. The bitmap recognizer sees the ink data as a stencil pattern of
points that it can compare to a library of patterns, searching for the closest
match. This technique, employed by optical character recognizers (OCRs), works
well for patterns limited to a few styles and sizes.
In contrast, vector recognition sees the ink as lines rather than points. The
method considers characteristics of the lines collected as the pen moves. These
characteristics include sequence, curvature, direction, and so forth. Given
the wide varieties and styles of handwriting, vector recognition works best for
deciphering pen input. The Pen API does not mandate which method a recognizer
employs, but is designed to facilitate vector rather than bitmap recognition.
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