OcrZoneCharacterFilters Enumeration

Visual Basic
C#
Objective-C
Java
C++

[FlagsAttribute()]
[DataContractAttribute(Namespace="http://Leadtools.Services.Forms.DataContracts/2009/01", Name="OcrZoneCharacterFilters")]
public enum OcrZoneCharacterFilters : System.Enum, System.IComparable, System.IConvertible, System.IFormattable

'Declaration
 
<FlagsAttribute()>
<DataContractAttribute(Namespace="http://Leadtools.Services.Forms.DataContracts/2009/01", Name="OcrZoneCharacterFilters")>
Public Enum OcrZoneCharacterFilters 
   Inherits System.Enum
   Implements System.IComparable, System.IConvertible, System.IFormattable

'Usage
 
Dim instance As OcrZoneCharacterFilters

[FlagsAttribute()]
[DataContractAttribute(Namespace="http://Leadtools.Services.Forms.DataContracts/2009/01", Name="OcrZoneCharacterFilters")]
public enum class OcrZoneCharacterFilters : public System.Enum, System.IComparable, System.IConvertible, System.IFormattable

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 Plus Engine Settings and LEADTOOLS OCR Professional Engine Settings.
0x00000021	Numbers	Digits plus the "FilterPlus" characters This is a combination of (Digit \| Plus).

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

For an example, refer to DocumentConvertOptions.PagesZones

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

Target Platforms

Reference

Leadtools.Services.Forms.DataContracts Namespace