Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 369)

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CHAPTER 9

Recognition

Using the Recognition System 9-27

When troubleshooting recognition errors, remember that view ﬂags may enable

multiple dictionaries and that the sets of dictionaries enabled by various ﬂags

may overlap.

As a general rule, the fastest and most accurate recognition occurs when the fewest

recognizers and dictionaries necessary to successfully analyze the input are

enabled. Enabling unnecessary recognizers and dictionaries may decrease the

speed and accuracy with which recognition is performed.

Recognizing Text 9

The vCharsAllowed and vLettersAllowed flags enable text recognition in

views that accept pen input. Either ﬂag enables the text recognizer speciﬁed by the

Handwriting Recognition preferences slip.

Each of these ﬂags speciﬁes different recognition options and dictionary sets. The

unique behaviors associated with each ﬂag are demonstrated most clearly by the

cursive recognizer. The cursive recognizer can be made to return only words

present in the set of dictionaries available to the view performing recognition. In

contrast, the printed recognizer can always return words or letter combinations that

are not present in dictionaries.

The

vCharsAllowed ﬂag enables a default set of dictionaries that provide

vocabulary used in common speech, names of days, names of months, proper

names, and words in the user dictionary. When the

vCharsAllowed ﬂag is set

and the

vLettersAllowed ﬂag is not, the cursive recognizer returns only words

that appear in the set of dictionaries available to the view performing recognition.

Note that the complete set of dictionaries available to the view may include those

enabled by other ﬂags. For example, the NTK view editor provides a Field Type

popup menu that allows you to specify whether the view is to accept phone, date,

time, address or name data. The choices in this menu set the

vPhoneField,

vDateField, vTimeField, vAddressField and vNameField flags,

respectively. Each of these ﬂags enables one or more dictionaries suited to

recognizing the speciﬁed input data. Custom dictionaries may also be made

available to the view performing recognition by setting the

vCustomDictionaries flag and providing a valid dictionaries slot in the

view that performs recognition.

The

vLettersAllowed ﬂag enables the cursive recognizer’s letter-by-letter

recognition option. When the

vLettersAllowed ﬂag is set, the cursive recognizer

may return words not appearing in dictionaries as well as nonword letter

combinations. Note that this conﬁguration increases the cursive recognizer’s chances

of misrecognizing words that appear in the set of dictionaries available to it.

Although both text recognizers provide a letter-based recognition feature, the two

recognition engines are completely distinct. Consequently, the results produced by

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