OCR at INIS
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Transcript of OCR at INIS
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IAEAInternational Atomic Energy Agency
International Atomic Energy Agency
International Nuclear Information System (INIS)
OCR at INIS
INIS Training Seminar7-11 October 2013, Vienna, Austria
Branko Krznarić
(based on the presentation by Yves Reynaud)INIS Unit
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IAEA INIS Training Seminar 7-11 October 2013, Vienna, Austria
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Outline
• What is OCR?• OCR Objectives• Principles• Techniques• Software
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IAEA INIS Training Seminar 7-11 October 2013, Vienna, Austria
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What is OCR?
(source: pcmag.com)
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Optical Character Recognition (OCR)
• OCR is the “conversion of scanned images of handwritten, typewritten or printed text into machine-encoded text.” [1]
• Make digitized images of printed documents searchable.
• Font encoding issues.
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OCR Objectives
We can “find the needle in the haystack”
• OCR offers a basic search from an unstructured document.
• OCR adds an extra value to your image.• OCR brings to life your digitized collection.
INIS Training Seminar 7-11 October 2013, Vienna, Austria
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OCR Techniques
• Pre-processing• De-skew• Despeckle• Binarization (optional)• Line removal• Layout analysis (zoning)
• Post-processing (dictionary)
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Scanned vs. Vector Image
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“Do not look at the trees (letters)try to see the forest (sentences)“
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Verdana Font
FOR ASSURING THE LONGEVITY OF INFORMATION, PERHAPS THE MOST IMPORTANT ROLE IN THE OPERATION OF A DIGITAL ARCHIVE IS MANAGING THE IDENTITY, INTEGRITY AND QUALITY OF THE ARCHIVES ITSELF AS A TRUSTED SOURCE OF THE CULTURAL RECORD.
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Brush Script MT (Windows Font)
FOR ASSURING THE LONGEVITY OF INFORMATION, PERHAPS THE MOST IMPORTANT ROLE IN THE OPERATION OF A DIGITAL ARCHIVE IS MANAGING THE IDENTITY, INTEGRITY AND QUALITY OF THE ARCHIVES ITSELF AS A TRUSTED SOURCE OF THE CULTURAL RECORD.
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PCs ≠ Humans
• OCR compares patterns and selects the closest match. It can be forced to a specific context, but requires customization.
• People adapt to circumstances and can circumvent misspellings if context is clear.
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True or false
Usually, printed text is adequately sampled if each line is at least two pixels in thickness:
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Zoom in
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Zoom in
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Results from OCR
It is in this context that I…
… and an additional protocol on the basis…
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Chinese Raster Image (scanned)
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Chinese Vector Image (OCR)滤器
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Arabic Raster Image (scanned)
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Arabic Vector Image (OCR)
ا هذوشملت
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Japanese Raster Image (scanned)
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Japanese Vector Image (OCR)
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Font Encoding
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Font Encoding (cont.)
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OCR Software
• Abbyy FineReader (multilingual OCR)• Adobe Acrobat• InftyReader
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Abbyy FineReader (interface)
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(12)where a . The indices now range from 1 to 5. The bosonic fields obey the commutation rules
(13)
InftyReader - an OCR System for Math Documents
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Reference
[1] “Optical character recognition” http://en.wikipedia.org/wiki/Optical_character_recognition. Retrieved 2013-09-23.
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Thank you!