LEADTOOLS OCR (Leadtools.Forms.Ocr assembly)

AutoPreprocess(OcrAutoPreprocessPageCommand,Int32,Int32,OcrProgressCallback) Method

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The preprocessing command to perform.
The zero-based index of the first page to preprocess.
The zero-based index of the last page to preprocess. A value of -1 means preprocess up to and including the last page in the OCR document.
Optional callback to show operation progress.
Perform auto image processing clean up on a range of the pages in the OCR document to enhance the quality of the pages before starting its recognition.
Syntax
'Declaration
 
Overloads Sub AutoPreprocess( _
   ByVal command As OcrAutoPreprocessPageCommand, _
   ByVal firstPageIndex As Integer, _
   ByVal lastPageIndex As Integer, _
   ByVal callback As OcrProgressCallback _
) 
'Usage
 
Dim instance As IOcrPageCollection
Dim command As OcrAutoPreprocessPageCommand
Dim firstPageIndex As Integer
Dim lastPageIndex As Integer
Dim callback As OcrProgressCallback
 
instance.AutoPreprocess(command, firstPageIndex, lastPageIndex, callback)
- (BOOL)autoPreprocess:(LTOcrAutoPreprocessPageCommand)command
        firstPageIndex:(int)firstPageIndex
         lastPageIndex:(int)lastPageIndex
                target:(id)target
              selector:(SEL)selector
                 error:(NSError**)outError;
            
public void autoPreprocess(OcrAutoPreprocessPageCommand command,
                           int firstPageIndex,
                           int lastPageIndex,
                           OcrProgressListener callback)
            
function Leadtools.Forms.Ocr.IOcrPageCollection.AutoPreprocess(OcrAutoPreprocessPageCommand,Int32,Int32,OcrProgressCallback)( 
   command ,
   firstPageIndex ,
   lastPageIndex ,
   callback 
)

Parameters

command
The preprocessing command to perform.
firstPageIndex
The zero-based index of the first page to preprocess.
lastPageIndex
The zero-based index of the last page to preprocess. A value of -1 means preprocess up to and including the last page in the OCR document.
callback
Optional callback to show operation progress.
Remarks

This method will iterate through pages between firstPageIndex and lastPageIndex in this OCR document and run IOcrPage.AutoPreprocess on each page.

You can use this method to deskew, rotate or invert the image according to command. By performing auto pre-processing on the page, you can improve the image quality of draft mode faxes.

You can use the OcrProgressCallback to show the operation progress or to abort it. For more information and an example, refer to OcrProgressCallback.

You should call this method prior to calling Recognize.

To perform auto-preprocessing on all the pages in the OCR document use AutoPreprocess(OcrAutoPreprocessPageCommand command, OcrProgressCallback callback).

Example
For an example, refer to IOcrPageCollection.
Requirements

Target Platforms

See Also

Reference

IOcrPageCollection Interface
IOcrPageCollection Members
Overload List
IOcrPage.AutoPreprocess
OcrAutoPreprocessPageCommand Enumeration
IOcrPage.GetDeskewAngle
IOcrPage.GetRotateAngle
IOcrPage.IsInverted
Recognize
IOcrPageCollection Interface
IOcrZoneCollection Interface
OcrZone Structure
Programming with the LEADTOOLS .NET OCR

 

 


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AutoPreprocess(OcrAutoPreprocessPageCommand,Int32,Int32,OcrProgressCallback) requires an OCR module license and unlock key. For more information, refer to: Imaging Pro/Document/Medical Features