Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 348)

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CHAPTER 9

Recognition

9-6 About the Recognition System

Text 9

When the recognition system returns a word unit to a view based on the

clParagraphView or clEditView classes, the view displays or uses the best

interpretation of the original input strokes. Paragraph views display words directly;

edit views create a

clParagraphView child automatically to display text that the

recognition system returns. Additionally, the recognition system constructs a

correction information frame from the word unit and saves learning data as

appropriate. For more information, see “Correction and Learning” (page 9-13)

and “Accessing Correction Information”(page 10-23). Your view can provide an

optional

ViewWordScript method to perform application-speciﬁc processing of

the word unit.

The set of possible interpretations that the text recognizer returns to a view is

affected by

■ the text recognizer that the view uses to interpret the input strokes

■ options you have speciﬁed for the text recognizer in use

■ the dictionaries that are available to the view for recognition use

A dictionary is a system construct against which the user’s input strings are

matched, as a means of ensuring the validity of the text recognizer’s output. The

system supplies dictionaries that deﬁne names, places, dates, times, phone numbers,

and commonly used words to the text recognizers. The user can expand the

system’s built-in vocabulary by adding new words to a RAM-based user dictionary

accessed from the Personal Word List slip. In addition, you can provide custom

dictionaries for the recognition system’s use. For example, you might create a

custom dictionary to supply specialized vocabulary, such as medical or legal

terminology. The section “System Dictionaries” beginning on page 9-11 describes

the system-supplied dictionaries in more detail. The use of custom dictionaries for

recognition is described in “Using Custom Dictionaries” beginning on page 10-24.

Although the interpretations returned by the printed recognizer are never limited to

dictionary words, its output is inﬂuenced strongly by the set of dictionaries

available for its use. The interpretations returned by the cursive recognizer can be

restricted to those words appearing in the set of dictionaries available for its use;

however its default behavior is to return non-dictionary words in addition to words

appearing in available dictionaries.

Options speciﬁed for the currently enabled recognizer may also inﬂuence the

interpretations it returns to the view. For example, the cursive recognizer’s default

settings enable its letter-by-letter recognition option, to increase the likelihood of

its returning strings not in the currently available set of dictionaries. The user can

control this option and others from within the Handwriting Settings preferences slip.

Note that even when the cursive and printed recognizers are conﬁgured similarly,

the results they return for the same input may differ. For example, using the cursive

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