Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 365)

100

101

CHAPTER 9

Recognition

Using the Recognition System 9-23

Obtaining Optimum Recognition Performance 9

To obtain the most accurate results from the recognition system, you must define as

precisely as possible the type of input that the view is to recognize. Aside from

potentially introducing errors, enabling superﬂuous recognizers may slow the

recognition system’s performance.

The view ﬂags that enable text recognition also enable dictionaries suited to

recognizing particular kinds of input, such as dates, phone numbers, and so on.

Some view ﬂags activate multiple dictionaries, and the sets of dictionaries activated

by various ﬂags may overlap. The system shows no preference towards any single

dictionary in a set except for a slight weighting of results in favor of words found

in the user dictionary, which most view ﬂags enable.

The speciﬁc dictionaries that a particular ﬂag enables varies according to the user’s

locale and the ROM version of the Newton device. You usually need not be

concerned with this implementation detail, nor should you rely on the presence of a

particular dictionary when setting view ﬂags.

When you need to control precisely which dictionaries a view uses for recognition,

you can set its

vCustomDictionaries ﬂag and use a dictionaries slot to

specify explicitly which dictionaries are to be used. For information about custom

dictionaries, see “Using Your RAM-Based Custom Dictionary” (page 10-28), in

Chapter 10, “Recognition: Advanced Topics.” For information about locale and the

recognition system, see “How Locale Affects Recognition” (page 20-2), in

Chapter 20, “Localizing Newton Applications.”

For best performance, you need to specify the minimum combination of recognizers

and dictionaries required to process the kind of input you expect the view to receive.

This equates to enabling the minimum set of view ﬂags that allow the view to

recognize appropriate input correctly. By restricting the possible interpretations

returned by the recognition system to only those that are appropriate for a particular

view, you increase the system’s chances of interpreting the input correctly. For

example, when conﬁguring a view for the entry of numeric data, you would not

specify that the recognition system return alphabetic characters to that view.

The printed and cursive text recognizers appear nearly identical to NewtonScript

applications. The main difference between them is that while the cursive recognizer

can be made to use the value of the

viewFlags slot as a strict deﬁnition of what it

can recognize, the printed recognizer uses this value as only a hint—that is, it can

always return values not speciﬁed by the input view’s view ﬂags. When conﬁguring

views for text recognition, you should set view ﬂags that describe the input you

anticipate the view to receive and then verify that you obtain acceptable results

from both text recognizers.

Because the printed recognizer lets you write anything in the input view, it may be

difﬁcult to determine whether your

viewFlags settings are appropriate when this

recognizer is enabled; the cursive recognizer usually provides better feedback in

1 2 ... 360 361 362 363 364 365 366 367 368 369 370 ... 941 942

Kommentare zu diesen Handbüchern

Keine Kommentare

Apple Newton Utilities Betriebsanweisung Seite 365

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Software Apple Newton Utilities