Adaptive Binarization of Unconstrained Hand-Held Camera-Captured Document Images

Abstract: This paper presents a new adaptive binarization technique for degraded hand-held camera-captured document images. The state-of-the-art locally adaptive binarization methods are sensitive to the values of free parameter. This problem is more critical when binarizing degraded camera-captured document images because of distortions like non-uniform illumination, bad shading, blurring, smearing and low resolution. We demonstrate in this paper that local binarization methods are not only sensitive to the selection of free parameters values (either found manually or automatically), but also sensitive to the constant free parameters values for all pixels of a document image. Some range of values of free parameters are better for foreground regions and some other range of values are better for background regions. For overcoming this problem, we present an adaptation of a state-of-the-art local binarization method such that two different set of free parameters values are used for foreground and background regions respectively. We present the use of ridges detection for rough estimation of foreground regions in a document image. This information is then used to calculate appropriate threshold using different set of free parameters values for the foreground and background regions respectively. The evaluation of the method using an OCR-based measure and a pixel-based measure show that our method achieves better performance as compared to state-of-the-art global and local binarization methods

Procesamiento de imágenes en tiempo real utilizando tecnología embebida : Aplicación en rehabilitación visual

Se presenta un dispositivo de rehabilitación visual, capaz de mejorar la calidad de vida de pacientes con disfunciones visuales severas (que padecen visión subnormal o baja visión). El mismo permite adquirir y procesar imágenes en tiempo real, efectuar un realce selectivo de la información visual y traducir dicha información a un patrón de estimulación apropiado para cada paciente. El software fue enteramente desarrollado empleando librerías open-source (OpenCV y Qt) y está lo suficientemente modularizado como para permitir una rápida adaptación a nuevos dispositivos embebidos, y un efectivo rediseño ajustando la plataforma a la evolución de la patología del paciente. El sistema está diseñado para correr sobre plataformas embebidas, como la placa de desarrollo Beagleboard, lo cual lo hace fácilmente configurable, portátil y de bajo costo. Se describen las herramientas utilizadas para implementar los diferentes procesamientos y se presentan los resultados obtenidos al aplicar los mismos sobre señales reales.Eje: Workshop Procesamiento de señales y sistemas de tiempo real (WPSTR)Red de Universidades con Carreras en Informática (RedUNCI

MPEG-2 Kodlanmış video görüntülerinin içerik tabanlı sorgulanması

Doktora tezi, MPEG-2 Kodlanmış Video Görüntülerinin İçerik Tabanlı Sorgulanması, T.C. Trakya Üniversitesi, Fen Bilimleri Enstitüsü, Bilgisayar Mühendisliği Ana Bilim Dalı. Bu tezin amacı, günümüzde yaygın olarak kullanılan video sıkıştırma yöntemlerinden olan MPEG-2 yöntemi kullanılarak sıkıştırılmış video görüntülerinin içerik tabanlı sorgulanmasına imkân sağlayan bir sistem geliştirmektir. Geliştirilen sistem MPEG-2 yöntemi kullanılarak sıkıştırılmış video dosyaları içersinde yer alan resim çerçevelerini elde ederek, bu resim çerçeveleri içersinde yer alan sahne metni ve yapay metinlerin konumlarını tespit etmektedir. Konumları tespit edilen bu ifadeler, OCR işlemine tabi tutularak, resim çerçevesinin içeriği hakkında bilgiler vermektedir. Elde edilen bu bilgiler veritabanına kayıt edilerek, video dosyasının içerik tabanlı sorgulanması sağlanmaktadır

Computer Science & Technology Series : XVIII Argentine Congress of Computer Science. Selected papers

CACIC’12 was the eighteenth Congress in the CACIC series. It was organized by the School of Computer Science and Engineering at the Universidad Nacional del Sur. The Congress included 13 Workshops with 178 accepted papers, 5 Conferences, 2 invited tutorials, different meetings related with Computer Science Education (Professors, PhD students, Curricula) and an International School with 5 courses. CACIC 2012 was organized following the traditional Congress format, with 13 Workshops covering a diversity of dimensions of Computer Science Research. Each topic was supervised by a committee of 3-5 chairs of different Universities. The call for papers attracted a total of 302 submissions. An average of 2.5 review reports were collected for each paper, for a grand total of 752 review reports that involved about 410 different reviewers. A total of 178 full papers, involving 496 authors and 83 Universities, were accepted and 27 of them were selected for this book.Red de Universidades con Carreras en Informática (RedUNCI