The French National Library (BnF*) has launched many mass digitization projects in order to give access to
its collection. The indexation of digital documents on Gallica (digital library of the BnF) is done through their
textual content obtained thanks to service providers that use Optical Character Recognition softwares (OCR).
OCR softwares have become increasingly complex systems composed of several subsystems dedicated to the
analysis and the recognition of the elements in a page. However, the reliability of these systems is always an
issue at stake. Indeed, in some cases, we can find errors in OCR outputs that occur because of an accumulation
of several errors at different levels in the OCR process. One of the frequent errors in OCR outputs is the missed
text components. The presence of such errors may lead to severe defects in digital libraries. In this paper, we
investigate the detection of missed text components to control the OCR results from the collections of the French
National Library. Our verification approach uses local information inside the pages based on Radon transform
descriptors and Local Binary Patterns descriptors (LBP) coupled with OCR results to control their consistency.
The experimental results show that our method detects 84.15% of the missed textual components, by comparing
the OCR ALTO files outputs (produced by the service providers) to the images of the document.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.