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AutoPreprocess(OcrAutoPreprocessPageCommand,int,int,OcrProgressCallback) Method

Summary

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

C#
VB
Java
Objective-C
C++

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

- (BOOL)autoPreprocessPages:(LTOcrAutoPreprocessPageCommand)command 
                    inRange:(NSRange)range 
                   progress:(nullable LTOcrProgressHandler)progressHandler 
                      error:(NSError **)error 

public void autoPreprocess(OcrAutoPreprocessPageCommand command, 
                           int firstPageIndex, 
                           int lastPageIndex, 
                           OcrProgressListener 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).

This member only works with memory-based documents and will throw an exception otherwise. For more information, refer to IOcrDocumentManager.CreateDocument and Programming with the LEADTOOLS .NET OCR.

Example

For an example, refer to IOcrPageCollection.

Requirements

Target Platforms

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