Dr. Maroua MEHRI Profile

Dr. Maroua MEHRI

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Publications (3)

Proceedings Article | 8 February 2015 Paper

Use of SLIC superpixels for ancient document image enhancement and segmentation

Maroua Mehri, Nabil Sliti, Pierre Héroux, Petra Gomez-Krämer, Najoua Essoukri Ben Amara, Rémy Mullot

Proceedings Volume 9402, 940205 (2015) https://doi.org/10.1117/12.2076020

KEYWORDS: Image segmentation, Image enhancement, Visualization, Image processing algorithms and systems, Feature extraction, Image analysis, Image processing, Spatial frequencies, Document image analysis, Evolutionary algorithms

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Proceedings Article | 4 February 2013 Paper

Old document image segmentation using the autocorrelation function and multiresolution analysis

Maroua Mehri, Petra Gomez-Krämer, Pierre Héroux, Rémy Mullot

Proceedings Volume 8658, 86580K (2013) https://doi.org/10.1117/12.2002365

KEYWORDS: Image segmentation, Visualization, Image quality, Image processing algorithms and systems, Feature extraction, Data modeling, Statistical analysis, Neodymium, Detection and tracking algorithms, Electroluminescent displays

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Recent progress in the digitization of heterogeneous collections of ancient documents has rekindled new challenges in information retrieval in digital libraries and document layout analysis. Therefore, in order to control the quality of historical document image digitization and to meet the need of a characterization of their content using intermediate level metadata (between image and document structure), we propose a fast automatic layout segmentation of old document images based on five descriptors. Those descriptors, based on the autocorrelation function, are obtained by multiresolution analysis and used afterwards in a specific clustering method. The method proposed in this article has the advantage that it is performed without any hypothesis on the document structure, either about the document model (physical structure), or the typographical parameters (logical structure). It is also parameter-free since it automatically adapts to the image content. In this paper, firstly, we detail our proposal to characterize the content of old documents by extracting the autocorrelation features in the different areas of a page and at several resolutions. Then, we show that is possible to automatically find the homogeneous regions defined by similar indices of autocorrelation without knowledge about the number of clusters using adapted hierarchical ascendant classification and consensus clustering approaches. To assess our method, we apply our algorithm on 316 old document images, which encompass six centuries (1200-1900) of French history, in order to demonstrate the performance of our proposal in terms of segmentation and characterization of heterogeneous corpus content. Moreover, we define a new evaluation metric, the homogeneity measure, which aims at evaluating the segmentation and characterization accuracy of our methodology. We find a 85% of mean homogeneity accuracy. Those results help to represent a document by a hierarchy of layout structure and content, and to define one or more signatures for each page, on the basis of a hierarchical representation of homogeneous blocks and their topology.

Proceedings Article | 17 February 2012 Paper

Analysis of electrodes' placement and deformation in deep brain stimulation from medical images

Maroua Mehri, Florent Lalys, Camille Maumet, Claire Haegelen, Pierre Jannin

Proceedings Volume 8316, 831632 (2012) https://doi.org/10.1117/12.912225

KEYWORDS: Electrodes, Brain, Image segmentation, Algorithm development, Computed tomography, Brain stimulation, Medical imaging, Parkinson's disease, Magnetic resonance imaging, Evolutionary algorithms

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