Improving Performance
224 Chapter 9
Improving Performance
If you scan typeset, high-quality printed pages, text recognition
accuracy should be very high.
With lesser-quality pages, however, text recognition may not be as
accurate. This section discusses a number of factors that affect scanning
and recognition performance:
• Document Quality
• Scanning Angle
• Scanner Glass Clarity
• Paper Transparency
Document Quality
OmniForm recognizes characters in almost any font from 6 to 72 points
in size. However, keep the following in mind when using OmniForm:
• The print should be reasonably clean and crisp. Characters must
be distinct: separated from each other and not blurry or
overlapping.
• The document should be free of notes, lines, or doodles. Anything
that is not a printed character slows recognition, and any character
distorted by a mark will be unrecognizable.
• The document font should be nonstylized; for example,
OmniForm may not recognize the
Zapf Chancery
font accurately.
• Forms with underlined text should have the lines placed below
the text and not touching it for best results. It is difficult to
recognize underlined text because the underline overprints the
descenders on the letters g
, j, p, q, and y, changing their shape.
Scanning Angle
Make sure that each document is positioned correctly in your scanner
and is not crooked. Even if you use the
Auto Form Straightening
option,
it is possible for the page to be too skewed for OmniForm to design it
properly. Adjust the page and rescan it if you see numerous recognition
errors due to skewing.
Scanner Glass Clarity
The sheet of glass on the flatbed of the scanner must be clear. If it gets
dirty, wipe it gently with a soft, damp, lint-free cloth or tissue. Be sure
that it is completely dry before you put pages on it.
See your scanner documentation for more information on proper
scanner maintenance.
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