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OcrZoneCharacterFilters Enumeration
See Also  
Leadtools.Forms.Ocr Namespace : OcrZoneCharacterFilters Enumeration



Character set filter.

Syntax

Visual Basic (Declaration) 
<FlagsAttribute()>
<SerializableAttribute()>
Public Enum OcrZoneCharacterFilters 
   Inherits Enum
Visual Basic (Usage)Copy Code
Dim instance As OcrZoneCharacterFilters
C# 
[FlagsAttribute()]
[SerializableAttribute()]
public enum OcrZoneCharacterFilters : Enum
C++/CLI 
[FlagsAttribute()]
[SerializableAttribute()]
public enum class OcrZoneCharacterFilters : public Enum

Members

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

Example

For an example, refer to IOcrPage.AutoZone.

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 denotes 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"

The recognition module selected for recognition can also impose restrictions, e.g. the OcrZoneRecognitionModule.IcrNumeral module is restricted to numerals and four other characters.

Not all recognition modules support all filter elements:
Recognition moduleCharacter filters supported
OcrZoneRecognitionModule.OmniFontMTextOcrZoneCharacterFilters.All, OcrZoneCharacterFilters.Digit and OcrZoneCharacterFilters.Alpha
OcrZoneRecognitionModule.OmniFontMorAll filters
OcrZoneRecognitionModule.DotMatrixAll filters
OcrZoneRecognitionModule.OmrNone (All ignored)
OcrZoneRecognitionModule.IcrNumeralOcrZoneCharacterFilters.All, OcrZoneCharacterFilters.Digit, OcrZoneCharacterFilters.Punctuation and OcrZoneCharacterFilters.Miscellaneous
OcrZoneRecognitionModule.IcrCharacterAll filters
OcrZoneRecognitionModule.MatrixMatchingAll filters
OcrZoneRecognitionModule.OmniFontPlus2WayVotingAll filters
OcrZoneRecognitionModule.OmniFontFireWorxAll filters
OcrZoneRecognitionModule.OmniFontPlus3WayVotingAll filters

Inheritance Hierarchy

System.Object
   System.ValueType
      System.Enum
         Leadtools.Forms.Ocr.OcrZoneCharacterFilters

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

See Also

OcrZoneCharacterFilters requires an OCR module license and unlock key. For more information, refer to: Imaging Pro/Document/Medical Features