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OcrZoneCharacterFilters Enumeration
See Also  
Leadtools.Services.Forms.DataContracts Namespace : OcrZoneCharacterFilters Enumeration



The OcrZoneCharacterFilters Enumeration is available in LEADTOOLS Document and Medical Imaging toolkits.

Character set filter.

Syntax

Visual Basic (Declaration) 
<DataContractAttribute(Namespace="http://Leadtools.Services.Forms.DataContracts/2009/01", Name="OcrZoneCharacterFilters")>
<FlagsAttribute()>
Public Enum OcrZoneCharacterFilters 
   Inherits System.Enum
   Implements IComparableIConvertibleIFormattable 
Visual Basic (Usage)Copy Code
Dim instance As OcrZoneCharacterFilters
C# 
[DataContractAttribute(Namespace="http://Leadtools.Services.Forms.DataContracts/2009/01", Name="OcrZoneCharacterFilters")]
[FlagsAttribute()]
public enum OcrZoneCharacterFilters : System.Enum, IComparableIConvertibleIFormattable  
C++/CLI 
[DataContractAttribute(Namespace="http://Leadtools.Services.Forms.DataContracts/2009/01", Name="OcrZoneCharacterFilters")]
[FlagsAttribute()]
public enum class OcrZoneCharacterFilters : public System.Enum, IComparableIConvertibleIFormattable  

Members

MemberDescription
AllAll characters. Since all elements are enabled, there is no filtering. This a combination of Digit (| Uppercase | Lowercase | Punctuation | Miscellaneous).
AlphaUpper and lowercase letters only. This is a combination of (Uppercase | Lowercase).
DigitRecognition of numerals only. For example: "3" (Digit Three).
LowercaseRecognition of lowercase letters only including accented ones. For example: "a" (Lowercase a).
MiscellaneousRecognition of other miscellaneous characters only. For example: "+" (Plus sign).
NoneNo character filters.
NumbersDigits plus the "FilterPlus" characters This is a combination of (Digit | Plus).
PlusEnables the use of the "FilterPlus" characters. The FilterPlus characters are added after any filtering. For more information, refer to LEADTOOLS OCR Plus Engine Settings and LEADTOOLS OCR Professional Engine Settings.
PunctuationRecognition of punctuation signs only. For example: "!" (Exclamation Mark).
UppercaseRecognition of uppercase letters only, including accented ones. For example: "A" (Capital A).

Example

For an example, refer to DocumentConvertOptions.PagesZones

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 System.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 module Character filters supported
OcrZoneRecognitionModule.OmniFontMText OcrZoneCharacterFilters.All, OcrZoneCharacterFilters.Digit and OcrZoneCharacterFilters.Alpha
OcrZoneRecognitionModule.OmniFontMor All filters
OcrZoneRecognitionModule.DotMatrix All filters
OcrZoneRecognitionModule.Omr None (All ignored)
OcrZoneRecognitionModule.IcrNumeral OcrZoneCharacterFilters.All, OcrZoneCharacterFilters.Digit, OcrZoneCharacterFilters.Punctuation and OcrZoneCharacterFilters.Miscellaneous
OcrZoneRecognitionModule.IcrCharacter All filters
OcrZoneRecognitionModule.MatrixMatching All filters
OcrZoneRecognitionModule.OmniFontPlus2WayVoting All filters
OcrZoneRecognitionModule.OmniFontFireWorx All filters
OcrZoneRecognitionModule.OmniFontPlus3WayVoting All filters

Inheritance Hierarchy

System.Object
   System.ValueType
      System.Enum
         Leadtools.Services.Forms.DataContracts.OcrZoneCharacterFilters

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7

See Also

Applications developed with LEADTOOLS WCF components require runtime licenses. Server licensing is required for applications on a server. For more information, refer to: Imaging Pro/Document/Medical Features