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31 Oct 2009

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5 Free OCR Software Tools To Convert Images Into Text

What is OCR?

Optical character recognition, usually abbreviated to OCR, is the mechanical or electronic translation of images of handwritten, typewritten or printed text (usually captured by a scanner) into machine-editable text. It is used to convert paper books and documents into electronic files, for instance, to computerize an old record-keeping system in an office, or to serve on a website such as Project Gutenberg.

The following are 5 Free OCR Software Tools To Convert Images Into Text. Enjoy it;-)

# 1 TopOCR

Just what I was talking about in the beginning! TopOCR, in a breakaway from typical OCR software, is designed more for digital cameras (at least 3MP) and mobile phones along with scanners. Like SimpleOCR, it has a two window interface – The source Image window and the Text window.

The image sourced from a camera or a scanner in the left window gets converted to the text format in the text editor on the right. The text editor functions like WordPad and can use Microsoft’s Text to Speech engine.

  • The software supports JPEG, TIFF, GIF and BMP formats.
  • Image settings like brightness, color, contrast, despeckle, sharpen etc. can be used to improve readability of the image.
  • Camera filter settings can also be configured for enhancing the image.
  • The converted file can be saved in a variety of formats – PDF, RTF, HTML and TXT.
  • TopOCR functions well with straight oriented text but the usual failing of OCR with columned text remains.
  • The software though, parses a mixed page (text plus graphics) well and processes the text only.
  • The software works with 11 languages.

TopOCR (v3.1) is an 8MB download and is compatible with Windows (not tested on Vista).

# 2 OCR Using Microsoft OneNote 2007

For the occasional basic OCR stuff, MS OneNote’s optical character recognition feature is a timesaver. You might have missed it…it’s called Copy Text from Picture.

  • Drag a scan or a saved picture into OneNote. You can also use OneNote to clip part of the screen or an image into OneNote.
  • Right click on the inserted picture and select Copy Text from Picture. The copied optically recognized text goes into the clipboard and you can now paste it into any program like Word or Notepad.

OneNote is simplicity personified. But it’s not too great for handwritten characters or even fuzzy ones. But for a quick job, I am all for OneNote’s clip and paste.

# 3 FreeOCR

This free OCR software uses the Tesseract OCR engine. Tesseract OCR code was developed at HP Labs between 1985 and 1995 and is currently with Google. It is thought of as one of the most accurate open source OCR engines available.

FreeOCR is a simple Windows interface for that underlying code.

  • It supports most image files and multi-page TIFF files.
  • It can handle PDF formats and is also compatible with TWAIN devices like scanners.
  • FreeOCR also has the familiar double window interface with easy to understand settings.
  • Before starting the one click conversion process, you can adjust the image contrast for better readability.

FreeOCR (v.2.03) requires Microsoft Net 2.0 framework.

Free OCR tools come with their own limitations. And scanning a page has to do a lot with resolutions, contrasts and clarity of fonts. From an average user’s standpoint, 100% OCR accuracy remains a pipedream.

Though the free tools were adequate with printed text, they failed with normal cursive handwritten text. My personal preference for offhand OCR use leans towards the two Microsoft products I mentioned in the beginning.

Your own say matters. Which is your tool of choice? Do the free OCR software recognize what you through at it? And more importantly, do you recognize what they throw back at you? Let us know…

# 4 SimpleOCR

The difficulty I was having with handwriting recognition using MS tools, could have found a solution in SimpleOCR. But the software offers handwriting recognition only as a 14 day free trial. Machine print recognition though does not have any restrictions.

  • The software can be set up to read directly from a scanner or by adding a page (jpg, tiff, bmp formats).
  • SimpleOCR offers some control over the conversion through text selection, image selection and text ignore features.
  • Conversion to text takes the process into a validation stage; a user can correct discrepancies in the converted text using an in-built spell-checker.
  • The converted file can be saved to a doc or txt format.

SimpleOCR was fine with normal text, but its handling of multi-column layouts was a comedown. In my opinion, the conversion accuracy of the Microsoft tools was considerably better than SimpleOCR.

SimpleOCR (v3.1) is a 9MB download and is compatible with Windows.

# 5 OCR Using Microsoft Office Document Imaging

Another little used tool within the Microsoft family. It’s right there under Menu – Microsoft Office – Microsoft Office Tools – Microsoft Office Document Imaging.

Doing OCR using the document imaging tool is a bit limiting because it accepts only TIFF (or MDI) formats. But that’s not too much of a bother as any graphic application can be used to convert an image to TIFF. In the screenshot below, I have used MS Paint to convert a JPEG to a TIFF.

  • Open the file in Microsoft Office Document Imaging – File – Open.
  • Click the little eye icon – Recognize Text Using OCR.
  • Click on MS Word Icon – Send Text to Word.
  • A MS Word File opens with the editable converted text.
  • Alternatively, you can also use MS Paint to select a specific area and copy it to the clipboard. Open MS Office Document Imaging – select Page – Paste Page to copy the selection for OCR.

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