نتایج جستجو برای: scenes and sequences

تعداد نتایج: 16849737  

1997
Stephen J. McKenna Shaogang Gong

Abs t r ac t . Face recognition systems typically operate robustly only within highly constrained environments. This paper describes work aimed at performing face recognition in more unconstrained environments such as occur in security applications based on closed-circuit television (CCTV). The system described detects and tracks several people as they m o v e through complex scenes. It uses a ...

2000
Marc Pollefeys Luc Van Gool

Modeling of three-dimensional (3D) objects from image sequences is a challenging problem and has been a research topic for many years. Important theoretical and algorithmic results were achieved that allow to extract even complex 3D models of scenes from sequences of images. One recent effort has been to reduce the amount of calibration and to avoid restrictions on the camera motion. In this co...

2000
Steven Mills Kevin L. Novins

Long image sequences provide a wealth of information, which means that a compact representation is needed to efficiently process them. In this paper a novel representation for motion segmentation in long image sequences is presented. This representation – the feature interval graph – measures the pairwise rigidity of features in the scene. The feature interval graph is recursively computed, mak...

Journal: :Ufahamu: A Journal of African Studies 1985

2008
Lucia Maddalena Alfredo Petrosino

Besides enabling the segmentation of video streams into moving and background components, detecting moving objects provides a focus of attention for recognition, classification, and activity analysis, making these later stepsmore efficient.Wepropose a novelmodel for image sequences based on self organization through artificial neural networks, that is used both for background modeling, allowing...

2006
Christian Beder Richard Steffen

Algorithms for metric 3d reconstruction of scenes from calibrated image sequences always require an initialization phase for fixing the scale of the reconstruction. Usually this is done by selecting two frames from the sequence and fixing the length of their base-line. In this paper a quality measure, that is based on the uncertainty of the reconstructed scene points, for the selection of such ...

2002
Alberto Albiol Luis Torres Edward J. Delp

In this paper we address the problem of detecting shots of subjects that are interviewed in news sequences. This is useful since usually these kinds of scenes contain important and reusable information that can be used for other news programs. In a previous paper, we presented a technique based on a priori knowledge of the editing techniques used in news sequences which allowed a fast search of...

Journal: :Applied Artificial Intelligence 2001
Antonio Chella Maria Donatella Guarino Ignazio Infantino Roberto Pirrone

We describe an arti® cial high-level vision system for the symbolic interpretation of data coming from a video camera that acquires the image sequences of moving scenes. The system is based on ARSOM neural networks that learn to generate the perception-grounded predicates obtained by image sequences. The ARSOM neural networks also provide a threedimensional estimation of the movements of the re...

2002
Ryszard Michalski Azriel Rosenfeld Zoran Duric Marcus Maloof Qi Zhang

This chapter concerns problems of learning patterns in images and image sequences, and using the obtained patterns for interpreting new images. The chapter concentrates on three problem areas: (i) semantic interpretation of color images of outdoor scenes, (ii) detection of blasting caps in x-ray images of luggage, and (iii) recognizing actions in video image sequences. It discusses the image fo...

2000
Marc Pollefeys Reinhard Koch Maarten Vergauwen Bert DeKnuydt Luc Van Gool

Modeling of three-dimensional (3D) objects from image sequences is a challenging problem and has been a research topic for many years. Important theoretical and algorithmic results were achieved that allow to extract even complex 3D models of scenes from sequences of images. One recent effort has been to reduce the amount of calibration and to avoid restrictions on the camera motion. In this co...

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