OcrZoneCharacterFilters Enumeration

Summary

Character set filter.

Syntax

Objective-C

C++

Java

[SerializableAttribute()] 
[FlagsAttribute()] 
public enum OcrZoneCharacterFilters

<FlagsAttribute()> 
<SerializableAttribute()> 
Public Enum OcrZoneCharacterFilters

typedef NS_OPTIONS(NSUInteger, LTOcrZoneCharacterFilters)

public enum OcrZoneCharacterFilters

[FlagsAttribute()] 
[SerializableAttribute()] 
public enum class OcrZoneCharacterFilters

Members

Value	Member	Description
0x00000000	None	No character filters.
0x00000001	Digit	Recognition of numerals only. For example: "3" (Digit Three).
0x00000002	Uppercase	Recognition of uppercase letters only, including accented ones. For example: "A" (Capital A).
0x00000004	Lowercase	Recognition of lowercase letters only including accented ones. For example: "a" (Lowercase a).
0x00000006	Alpha	Upper and lowercase letters only. This is a combination of (Uppercase \| Lowercase).
0x00000008	Punctuation	Recognition of punctuation signs only. For example: "!" (Exclamation Mark).
0x00000010	Miscellaneous	Recognition of other miscellaneous characters only. For example: "+" (Plus sign).
0x0000001F	All	All characters. Since all elements are enabled, there is no filtering. This a combination of Digit (\| Uppercase \| Lowercase \| Punctuation \| Miscellaneous).
0x00000020	Plus	Enables the use of the "FilterPlus" characters. The FilterPlus characters are added after any filtering. For more information, refer to LEADTOOLS OCR Module - OmniPage Engine Settings.
0x00000021	Numbers	Digits plus the "FilterPlus" characters This is a combination of (Digit \| Plus).

Remarks

This enumeration lists the available character set filter elements. The Language environment can be narrowed by specifying Character Set filters. The name of each filter element indicates which category of characters it validates. This enumeration is attributes with the FlagsAttribute and its members can be combined (OR-ed) together.

The filters can have an effect either at zone level (by specifying the zone's OcrZone.CharacterFilters property), or globally, at image level (defined by the "Recognition.DefaultCharacterFilter" setting).

The way to set no filtering is to give the value OcrZoneCharacterFilters.All.

Characters of the document that are not part of the specified character set will either be rejected or will be recognized as a validated character with a similar shape. For instance, if only the English language has been selected and the document contains a letter "Capital A with acute", then the recognized output will be a letter "Capital A"

Example

For an example, refer to IOcrPage.AutoZone.

Requirements

Target Platforms

Reference

Leadtools.Ocr Namespace

AutoZone Method

OcrEngineManager Class

OcrEngineType Enumeration

IOcrPageCollection Interface

IOcrZoneCollection Interface

OcrZone Structure

Programming with the LEADTOOLS .NET OCR

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Help Version 21.0.2021.7.2