0 Replies Latest reply: Sep 17, 2013 2:39 PM by mhraygow RSS

    Workaround for OCR "Unknown Error"/"Paper Capture recognition service experienced an error"

    mhraygow Community Member

      Problem Description:

       

      When attempting to "Recognize Text", one of the following error messages appears:

      • "Unknown Error." when using one of the "Searchable Image" or "Searchable Image (Exact)" settings, or
      • "Unable to process the page because the Paper Capture recognition service experienced an error. (6)" when using the "ClearScan" setting.

       

      Problem Origin:

       

      It seems to be a compatibility issue in the PDF and not in the OCR algorithm itself, although this is speculation and not an official statement.

       

      Problem Workaround:

       

      A possible solution consists of saving the afflicted PDF pages as PNG images (lossless), opening the PNGs in Acrobat, and then performing OCR. Specifically,

      1. Page Thumbnails -> Right-click afflicted pages -> Extract Pages...
      2. File -> Open extracted pages
      3. File -> Save as -> Image -> PNG
      4. Right-click PNG files -> Convert to Adobe PDF
      5. Tools -> Recognize Text -> In This File
      6. File -> Open original PDF
      7. Page Thumbnails -> Right-click afflicted pages -> Replace Pages...

       

      This has worked for every problem instance that I've come across, and there appears to be no quality loss. If anyone else can verify this solution, I would appreciate it.