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Question

Question

OCR Failure occurs on some pages of document

asked on June 20, 2017

When I try to OCR the attached document I get the following error...

 

 

The event log shows the following information...

Faulting application name: LFOmniOCR.exe, version: 9.0.0.165, time stamp: 0x54ebd105

Faulting module name: ntdll.dll, version: 6.1.7601.23807, time stamp: 0x5915f8e8

Exception code: 0xc0000374

Fault offset: 0x000ce8fb

Faulting process id: 0x4d1c

Faulting application start time: 0x01d2e992aeb78b37

Faulting application path: C:\Program Files (x86)\Common Files\Laserfiche\Batch Processor\BPOmniOCR185\LFOmniOCR.exe

Faulting module path: C:\Windows\SysWOW64\ntdll.dll

Report Id: fe254867-5585-11e7-abf5-534e57000000

 

I produced the error above using the Windows Client but the same problem occurs when I run the OCR Engine from the SDK (OCREngine class in DocumentServices), which is what I am actually trying to do.

The attachment is just a sample.  In the real world this page is part of a large document.  In the SDK the LFOmniOCR.exe is abruptly terminated and so the document is left in a semi-OCR'ed state (the attached page and all pages after the attached page are not OCR'ed)

I am attempting to OCR the entire document using the following code...

var ocrEngine = OcrEngine.LoadEngine();
ocrEngine.AutoOrient = true;
ocrEngine.Decolumnize = true;
ocrEngine.OptimizationMode = OcrOptimizationMode.Accuracy;
ocrEngine.Run(docInfo);

 

WillNotOCR.pdf (44.73 KB)
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Replies

replied on June 20, 2017

If the image meets the page size requirements below, please have your reseller open a support case and attach the file.

Maximum image sizes

  • The height or width of black-and-white images must not exceed 28 inches (71cm) nor 8400 pixels.
  • The height or width of grayscale and color images must not exceed 28 inches (71cm) and also have the following pixel limits:
    • Resolution from 75 to 150 dpi: 4200 pixels
    • Resolution from 151 to 200 dpi: 5600 pixels
    • Resolution from 201 to 600 dpi: 8400 pixels

 

Minimum image sizes

  • The width and height of page images must be at least 50 pixels.
  • Resolution The resolution of page images must be between 75 and 600 dpi.

 

The optimum resolution for OCR is 300 dpi.

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