OCRProcessor.PerformOCR cancel OCR

[Marek Opanas]

How to control OCRProcessor.PerformOCR method timeout or cancel OCR itself whenTesseract engine is used? I can kill the running thread but I find that OCRProcessor.PerformOCRlaunches another process with the extension .tmp which is not killed when I abort C# thread where OCRProcessor running.

[Sowmiya Loganathan]

Hi Marek, 

Thank you for contacting Syncfusion support.  

We have analyzed your requirement. When tried to kill the running thread of OCR with Tesseract version 3.02, it will not kill the another process of OCRProcessor.PerformOCRlaunches with extension .tmp. However we can achieve your requirement by using Tesseract 3.05 version with enabling of “EnableNativeCall” property in 64-bit binaries (This 64-bit binaries should require when the native call property is enabled). Please find the X64 bit supporting tesseract binaries download link from below, 

Tesseract 64-bit binaries  

While performing OCR with this settings, it will not create the another process as like the above. Please refer the below code snippet for more details, 

//Load a PDF document 

PdfLoadedDocument lDoc = new PdfLoadedDocument("input.pdf"); 

 

//Set OCR language to process 

processor.Settings.Language = Languages.English; 

 

//Set tesseract OCR version  

processor.Settings.TesseractVersion = TesseractVersion.Version3_05; 

 

//Enable native call  

processor.Settings.EnableNativeCall = true; 

 

//Process OCR by providing the PDF document and Tesseract data 

string str = processor.PerformOCR(lDoc, @"Tessdata/", true); 

Please refer the below UG documentation link for more details, 

https://help.syncfusion.com/file-formats/pdf/working-with-ocr#performing-ocr-with-tesseract-version-305  

Kindly try the above solution in your end and let us knw the result.  

Regards, 

Sowmiya Loganathan 

[Marek Opanas]

Thank you. You could improve your library by adding the Cancel() method and the library would take care of canceling OCR. Just suggestion.

[Sowmiya Loganathan]

Hi Marek, 

Thank you for the suggestion. We will consider this.  

Regards, 

Sowmiya Loganathan