NUANCE OmniPage Direct, Руководство пользователя

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Improving Accuracy
How to Improve Performance 27
Improving Accuracy
If you scan typeset, high-quality printed pages, you will probably find that
Direct recognizes text perfectly: the text that appears in your word
processor matches the text in the scanned page letter-for-letter.
With lesser-quality pages, text-recognition accuracy will be poorer. These
factors most affect text-recognition accuracy:
• Document Quality
• The Brightness Setting
• Scanner Glass Clarity
• Paper Transparency
Document Quality
Direct recognizes characters in almost any font from 6 to 72 points in size.
However, keep the following in mind when using Direct:
• The print should be reasonably clean and crisp. Characters must
be distinct: separated from each other and not blotched together
or run-on.
• The document should be free of notes, lines, or doodles. Any-
thing that is not a printed character will slow Direct considerably,
and any character distorted by a mark will be unrecognizable.
• The document font must be non-stylized; for example, the Zapf
Chancery font is too fancy for Direct.
• It’s hard to recognize underlined text accurately; the underline
changes the shape of descenders on the letters q, g, y, p, and j.
The Brightness Setting
The Brightness setting is your most powerful means to improve text-
recognition accuracy. It is available in the Options dialog box if you de-
select
Auto Intensity .
Manually adjusting the Brightness control allows for differences in paper
and print quality for all kinds of pages: newsprint, glossy paper, thickly
inked, etc. The following image shows a lower-case e printed on glossy
paper as it might appear to Direct. Notice the thin, horizontal line in the
middle. Is this character an e or a c? It may be hard for Direct to tell.