TY - CHAP T1 - Restoration of blurred binary images using discrete tomography T2 - Advanced Concepts for Intelligent Vision Systems (ACIVS) Y1 - 2013 A1 - Jozsef Nemeth A1 - Péter Balázs ED - Jacques Blanc-Talon ED - Andrzej Kasinski ED - Wilfried Philips ED - Dan Popescu ED - Paul Scheunders AB -

Enhancement of degraded images of binary shapes is an important task in many image processing applications, e.g. to provide appropriate image quality for optical character recognition. Although many image restoration methods can be found in the literature, most of them are developed for grayscale images. In this paper we propose a novel binary image restoration algorithm. As a first step, it restores the projections of the shape using 1-dimensional deconvolution, then reconstructs the image from these projections using a discrete tomography technique. The method does not require any parameter setting or prior knowledge like an estimation of the signal-to-noise ratio. Numerical experiments on a synthetic dataset show that the proposed algorithm is robust to the level of the noise. The efficiency of the method has also been demonstrated on real out-of-focus alphanumeric images.

 

JF - Advanced Concepts for Intelligent Vision Systems (ACIVS) T3 - Lecture Notes in Computer Science PB - Springer Verlag CY - Berlin; Heidelberg; New York; London; Paris; Tokyo SN - 978-3-319-02894-1 N1 - ScopusID: 84890864720doi: 10.1007/978-3-319-02895-8_8 JO - LNCS ER - TY - CHAP T1 - 3D Parallel Thinning Algorithms Based on Isthmuses T2 - Advanced Concepts for Intelligent Vision Systems (ACIVS) Y1 - 2012 A1 - Gábor Németh A1 - Kálmán Palágyi ED - Jacques Blanc-Talon ED - Wilfried Philips ED - Dan Popescu ED - Paul Scheunders ED - Pavel Zemčík AB -

Thinning is a widely used technique to obtain skeleton-like shape features (i.e., centerlines and medial surfaces) from digital binary objects. Conventional thinning algorithms preserve endpoints to provide important geometric information relative to the object to be represented. An alternative strategy is also proposed that preserves isthmuses (i.e., generalization of curve/surface interior points). In this paper we present ten 3D parallel isthmus-based thinning algorithm variants that are derived from some sufficient conditions for topology preserving reductions.

JF - Advanced Concepts for Intelligent Vision Systems (ACIVS) T3 - Lecture Notes in Computer Science PB - Springer Verlag CY - Brno, Czech Republic VL - 7517 UR - http://dx.doi.org/10.1007/978-3-642-33140-4_29 N1 - N1 10.1007/978-3-642-33140-4_29 JO - Conference Paper ER - TY - CHAP T1 - A Multi-Layer 'Gas of Circles' Markov Random Field Model for the Extraction of Overlapping Near-Circular Objects T2 - Advances Concepts for Intelligent Vision Systems (ACIVS) Y1 - 2011 A1 - Jozsef Nemeth A1 - Zoltan Kato A1 - Ian Jermyn ED - Jacques Blanc-Talon ED - Wilfried Philips ED - Dan Popescu ED - Paul Scheunders ED - Richard Kleihorst AB -

We propose a multi-layer binary Markov random field (MRF) model that assigns high probability to object configurations in the image domain consisting of an unknown number of possibly touching or overlapping near-circular objects of approximately a given size. Each layer has an associated binary field that specifies a region corresponding to objects. Overlapping objects are represented by regions in different layers. Within each layer, long-range interactions favor connected components of approximately circular shape, while regions in different layers that overlap are penalized. Used as a prior coupled with a suitable data likelihood, the model can be used for object extraction from images, e.g. cells in biological images or densely-packed tree crowns in remote sensing images. We present a theoretical and experimental analysis of the model, and demonstrate its performance on various synthetic and biomedical images.

JF - Advances Concepts for Intelligent Vision Systems (ACIVS) T3 - Lecture Notes in Computer Science PB - Springer-Verlag CY - Ghent, Belgium SN - 978-3-642-23686-0 UR - http://www.inf.u-szeged.hu/ipcg/publications/Year/2011.complete.xml#Nemeth-etal2011 N1 - UT: 000306962700016 JO - LNCS ER - TY - CHAP T1 - Projection selection algorithms for discrete tomography T2 - Advanced Concepts for Intelligent Vision Systems Y1 - 2010 A1 - László Gábor Varga A1 - Péter Balázs A1 - Antal Nagy ED - Jacques Blanc-Talon ED - Don Bone ED - Wilfried Philips ED - Dan Popescu ED - Paul Scheunders JF - Advanced Concepts for Intelligent Vision Systems PB - Springer Verlag CY - Sydney, Australia N1 - UT: 000287941400037ScopusID: 78650892305doi: 10.1007/978-3-642-17688-3_37 ER - TY - CONF T1 - A Multispectral Data Model for Higher-Order Active Contours and its Application to Tree Crown Extraction T2 - Proceedings of the Advanced Concepts for Intelligent Vision Systems (ACIVS) Y1 - 2007 A1 - Peter Horvath ED - Wilfried Philips ED - Dan Popescu ED - Paul Scheunders JF - Proceedings of the Advanced Concepts for Intelligent Vision Systems (ACIVS) CY - Delft, Netherlands VL - 4678 ER - TY - CHAP T1 - Method for automatically segmenting the spinal cord and canal from 3D CT images T2 - Computer Analysis of Images and Patterns Y1 - 2005 A1 - László Gábor Nyúl A1 - Judit Kanyó A1 - Eörs Máté A1 - Géza Makay A1 - Emese Balogh A1 - Márta Fidrich A1 - Attila Kuba ED - André Gagalowitz ED - Wilfried Philips JF - Computer Analysis of Images and Patterns PB - Springer-Verlag CY - Berlin; Heidelberg N1 - UT: 000232301200056 ER -