OcrZoneCharacterFilters Enumeration

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C#
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[FlagsAttribute()]
[SerializableAttribute()]
public enum OcrZoneCharacterFilters : System.Enum, System.IComparable, System.IConvertible, System.IFormattable

'Declaration
 
<FlagsAttribute()>
<SerializableAttribute()>
Public Enum OcrZoneCharacterFilters 
   Inherits System.Enum
   Implements System.IComparable, System.IConvertible, System.IFormattable

'Usage
 
Dim instance As OcrZoneCharacterFilters

[FlagsAttribute()]
[SerializableAttribute()]
public enum OcrZoneCharacterFilters : System.IComparable, System.IConvertible, System.IFormattable

Leadtools.Forms.Ocr.OcrZoneCharacterFilters = function() { };
Leadtools.Forms.Ocr.OcrZoneCharacterFilters.prototype = {

  LeadtoolsMemberMarker(replace me)
 };

[FlagsAttribute()]
[SerializableAttribute()]
public enum class OcrZoneCharacterFilters : public System.Enum, System.IComparable, System.IConvertible, System.IFormattable

Member	Description
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).
Digit	Recognition of numerals only. For example: "3" (Digit Three).
Lowercase	Recognition of lowercase letters only including accented ones. For example: "a" (Lowercase a).
Miscellaneous	Recognition of other miscellaneous characters only. For example: "+" (Plus sign).
None	No character filters.
Numbers	Digits plus the "FilterPlus" characters This is a combination of (Digit \| Plus).
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 and LEADTOOLS OCR Professional Engine Settings.
Punctuation	Recognition of punctuation signs only. For example: "!" (Exclamation Mark).
Uppercase	Recognition of uppercase letters only, including accented ones. For example: "A" (Capital A).

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
OcrZoneRecognitionModule.Asian	None (All ignored)

For an example, refer to IOcrPage.AutoZone.

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

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

Leadtools.Forms.Ocr Namespace
AutoZone Method
OcrZoneRecognitionModule Enumeration
OcrZoneFillMethod Enumeration
OcrEngineManager Class
OcrEngineType Enumeration
IOcrPageCollection Interface
IOcrZoneCollection Interface
OcrZone Structure
Programming with the LEADTOOLS .NET OCR
LEADTOOLS OCR Plus Engine Settings