Overloads Overridable Sub AutoPreprocess( _
   ByVal command As OcrAutoPreprocessPageCommand, _
   ByVal firstPageIndex As Integer, _
   ByVal lastPageIndex As Integer, _
   ByVal callback As OcrProgressCallback _
) 

Visual Basic (Usage)	Copy Code
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)

virtual void AutoPreprocess( 
   OcrAutoPreprocessPageCommand command,
   int firstPageIndex,
   int lastPageIndex,
   OcrProgressCallback callback
)

virtual void AutoPreprocess( 
   OcrAutoPreprocessPageCommand command,
   int firstPageIndex,
   int lastPageIndex,
   OcrProgressCallback^ 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.

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).

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

Reference