FindZones Method

Visual Basic (Declaration)
Public Sub FindZones( _ ByVal pageIndex As Integer, _ ByVal zoneArea As Rectangle _ )

Visual Basic (Usage)	Copy Code
`Dim instance As RasterDocumentEngine Dim pageIndex As Integer Dim zoneArea As Rectangle instance.FindZones(pageIndex, zoneArea)`

C#
public void FindZones( int pageIndex, Rectangle zoneArea )

C++/CLI
public: void FindZones( int pageIndex, Rectangle zoneArea )

Parameters

pageIndex: Specifies the index of the page to search. This is a zero-based index.
zoneArea: Specifies the zone area to be searched.

Visual Basic Copy Code

Visual Basic	Copy Code
Public Sub FindZonesExample() ' Note that this is a sample key, which will not work in your toolkit RasterSupport.Unlock(Leadtools.RasterSupportType.Ocr, "TestKey") Dim rasterDocument As RasterDocumentEngine rasterDocument = RasterDocumentEngine.Instance rasterDocument.Startup() rasterDocument.ShowZoneGridlines = True rasterDocument.EnableZoneForceSingleColumn = True rasterDocument.ZoneParser = RasterDocumentPageParser.Auto rasterDocument.FindZones(0, Rectangle.Empty) ' Note that this is a sample key, which will not work in your toolkit RasterSupport.Unlock(Leadtools.RasterSupportType.Ocr, "TestKey") rasterDocument.Shutdown() End Sub

Public Sub FindZonesExample()

   ' Note that this is a sample key, which will not work in your toolkit

   RasterSupport.Unlock(Leadtools.RasterSupportType.Ocr, "TestKey")



   Dim rasterDocument As RasterDocumentEngine

   rasterDocument = RasterDocumentEngine.Instance

   rasterDocument.Startup()



   rasterDocument.ShowZoneGridlines = True

   rasterDocument.EnableZoneForceSingleColumn = True

   rasterDocument.ZoneParser = RasterDocumentPageParser.Auto

   rasterDocument.FindZones(0, Rectangle.Empty)



   ' Note that this is a sample key, which will not work in your toolkit

   RasterSupport.Unlock(Leadtools.RasterSupportType.Ocr, "TestKey")



   rasterDocument.Shutdown()

End Sub

C# Copy Code

C#	Copy Code
public void FindZonesExample() { // Note that this is a sample key, which will not work in your toolkit RasterSupport.Unlock(Leadtools.RasterSupportType.Ocr, "TestKey"); RasterDocumentEngine rasterDocument; rasterDocument = RasterDocumentEngine.Instance; rasterDocument.Startup(); // assume page is added, refer to AddPage example for more information rasterDocument.ShowZoneGridlines = true; rasterDocument.EnableZoneForceSingleColumn = true; rasterDocument.ZoneParser = RasterDocumentPageParser.Auto; rasterDocument.FindZones(0, Rectangle.Empty); rasterDocument.Shutdown(); }

public void FindZonesExample() 
{ 
   // Note that this is a sample key, which will not work in your toolkit 
   RasterSupport.Unlock(Leadtools.RasterSupportType.Ocr, "TestKey"); 
 
   RasterDocumentEngine rasterDocument; 
   rasterDocument = RasterDocumentEngine.Instance; 
   rasterDocument.Startup(); 
 
   // assume page is added, refer to AddPage example for more information 
 
   rasterDocument.ShowZoneGridlines = true; 
   rasterDocument.EnableZoneForceSingleColumn = true; 
   rasterDocument.ZoneParser = RasterDocumentPageParser.Auto; 
   rasterDocument.FindZones(0, Rectangle.Empty); 
 
   rasterDocument.Shutdown(); 
}

The FindZones method is used for parsing the specified page (also called: auto-zoning), i.e. it analyzes the structure of the page layout and locates blocks for further processing. The method performs the analysis within the specified area of the image, which is defined in the zoneArea parameter. It finds text or graphics blocks within the specified area, builds a zone list and then connects it to the specified page.
Zones found by this method are entered in a sequential list, called the zone list, which is attached to the specified page. When this method is called, any previously inserted zones are deleted from this list.
The GetZoneCount method can be used to retrieve the number of zones in the zone list. Zones can be deleted from this list by calling RemoveZone. You can get the zone parameters by calling GetZone method. After modifying some zone attributes, use the UpdateZone method to apply the changes to the zone.
This method finds the zone coordinates and the type of the zone. The zone type determines the role of the zone in the image layout and can be classified into three different groups:

Group 1: flowed text types: RasterDocumentZoneType.FlowText, RasterDocumentZoneType.Column, RasterDocumentZoneType.Header, RasterDocumentZoneType.Footer, RasterDocumentZoneType.Caption, RasterDocumentZoneType.Title, and RasterDocumentZoneType.Other.
These zone types mean that the zone contains textual information without a table type structure (it is flowed text). The types listed above are considered the same. They are differentiated from each other during the later processing stages.
Group 2: table text type: RasterDocumentZoneType.Table.
This type means that the zone is detected as containing a table, i.e. with columns, with or without a grid. Such zones are handled differently from those of flowed text type zones.
Group 3: graphic zones: RasterDocumentZoneType.Graphic and RasterDocumentZoneType.SGraphic.
These zones contain graphics, i.e. this zone will not be recognized at all. These zones exist only to allow saving or export of the image inside the zone area.

New zones created by this method always take the value RasterDocumentCharacterFilter.Default, meaning that the zone will take on the global filter setting (which is by default RasterDocumentCharacterFilter.Default to have no filtering).
New zones located by this method always have the RasterDocumentFillMethod.Default and RasterDocumentRecognizeModule.Auto values in their RasterDocumentEngine.FillMethod and RasterDocumentZoneData.RecognizeModule properties, respectively. The "meaning" of the RasterDocumentFillMethod.Default filling method can be specified with the RasterDocumentZoneData.FillMethod property.
On the other hand, there is no similar method for specifying the default recognition module.
New zones created by this method always have empty strings in their RasterDocumentZoneData.SectionName property, which specifies the use of the default section of any enabled User dictionary.
The GetDefaultFillMethod method can be used when you don't know the type of page to be processed. The following properties are used when finding zones:

For more information, refer to Working with Zones.

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

Reference

RasterDocumentEngine Class
RasterDocumentEngine Members
ShowZoneGridlines Property
EnableZoneForceSingleColumn Property
ZoneParser Property
ExportZones Method
ImportZones Method
RemoveZone Method
UpdateZone Method
GetZone Method
GetZoneCount Method
AddZone Method
Verify Event
Recognize Method

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FindZones Method
See Also Example

Syntax

Parameters

Example

Remarks

Requirements

See Also

Reference