Highly curved parts of object boundaries (curvature features) regularly correspond to characteristic image regions with high information content, which make them good candidates for object recognition and for establis...
详细信息
ISBN:
(纸本)0780375270
Highly curved parts of object boundaries (curvature features) regularly correspond to characteristic image regions with high information content, which make them good candidates for object recognition and for establishing image correspondence in stereo or motion analysis. Unfortunately, computervision procedures for detecting thew features must deal with conceptual problem of context dependency, since similar regions in different contexts may correspond once to a salient curvature feature, and other time to noise or deformed part of a straight boundary. In order to disambiguate such situations, a robust procedure should consider an appropriate neighbourhood for each candidate image location. In the proposed approach, the dimensionality of the search is reduced by preprocessingthe input image by tuned edge detection and linking algorithms. thus, curvature features can be searched only at points not ruled out in the preprocessing, while the complexity of the analysis is reduced from quadratic to linear. A representative subset of processing results is provided.
View synthesis becomes a focus of attention of boththe computergraphics and computervision communities. In this paper, we present a new approach for synthesizing novel views from two uncalibrated images. the two re...
详细信息
ISBN:
(纸本)0769511848
View synthesis becomes a focus of attention of boththe computergraphics and computervision communities. In this paper, we present a new approach for synthesizing novel views from two uncalibrated images. the two reference images as well as the novel view are not sharing the same viewpoint. the developed approach incorporates computervision methods. It consists of two stages. First, the parallax field between the reference images is recovered. Second, novel images are directly synthesized by exploiting the parallax invariance, using forward warping. Solutions to the visibility problem are proposed. Constructing realistic synthesized views from real image pairs are presented.
Visual Information Retrieval presents many challenges for the computervision community. the terabytes of visual information stored in digital image and video libraries will remain inaccessible if the problems of inde...
详细信息
ISBN:
(纸本)076951183X;0769511848
Visual Information Retrieval presents many challenges for the computervision community. the terabytes of visual information stored in digital image and video libraries will remain inaccessible if the problems of indexing and retrieval are not addressed. In this paper, we present techniques for content based image retrieval using higher level contextual information. the content is represented and queried using attributed relational graphs, with colour attributes and relaxation labeling techniques. We present retrieval examples using both synthetic and real images of national flags. this, although a simplistic problem, highlights the shortcomings, and difficulties associated with content based retrieval systems.
Motion description is an example of the high level video processing. It attracts increasing interest in the computervision community due to its wide spectrum of applications. In such application as multimedia databas...
详细信息
ISBN:
(纸本)076951183X;0769511848
Motion description is an example of the high level video processing. It attracts increasing interest in the computervision community due to its wide spectrum of applications. In such application as multimedia database systems, motion descriptors act as a high level query tool. In this paper we propose a periodic motion detection and description algorithm. We demonstrate that the descriptor extracted by the algorithm can characterise the human running behaviour. It can also serve as a basis for the classification of the human running activity. Experimental results based on Barcelona Olympic Games image sequences show the benefits of the proposed algorithm.
View synthesis becomes a focus of attention of boththe computergraphics and computervision communities. We present a new approach for synthesizing novel views from two uncalibrated images. the two reference images ...
详细信息
View synthesis becomes a focus of attention of boththe computergraphics and computervision communities. We present a new approach for synthesizing novel views from two uncalibrated images. the two reference images as well as the novel view do not share the same viewpoint. the developed approach incorporates computervision methods. It consists of two stages. First, the parallax field between the reference images is recovered. Second, novel images are directly synthesized by exploiting the parallax invariance, using forward warping. Solutions to the visibility problem are proposed. Constructing realistic synthesized views from real image pairs are presented.
the modal correspondence method of L.S. Shapiro and J.M. Brady (see image and vision Computing, vol.10, p.283-8, 1992) aims to match point-sets by comparing the eigenvectors of a pairwise point proximity matrix. Altho...
详细信息
Non-intrusive human body tracking is a key issue in advanced human-computer interaction, with key applications ranging from virtual reality to videoconferencing and telepresence. this paper describes a system for visi...
详细信息
Non-intrusive human body tracking is a key issue in advanced human-computer interaction, with key applications ranging from virtual reality to videoconferencing and telepresence. this paper describes a system for vision-based tracking of body posture. the system is explicitly designed to provide a robust yet simple and inexpensive solution to real-time body tracking through a careful choice of visual and kinematic models. Human posture representation is fully compatible withthe MPEG-4 standard. Results of system application to a computergraphics scenario (animation of 3D avatars) are presented and discussed.
Markov random field (MRF) is a well known model for the generation of textures in the field of computergraphics. However, the estimation of its parameter is quite difficult in many cases. A new algorithm for the synt...
详细信息
Markov random field (MRF) is a well known model for the generation of textures in the field of computergraphics. However, the estimation of its parameter is quite difficult in many cases. A new algorithm for the synthesis of textures is proposed, based on image pyramids and self-organizing maps. this procedure avoids the explicit computation of the MRF parameters. Preliminary results support the appropriateness of this new approach.
Visual information retrieval presents many challenges for the computervision community. the terabytes of visual information stored in digital image and video libraries will remain inaccessible if the problems of inde...
详细信息
ISBN:
(纸本)076951183X
Visual information retrieval presents many challenges for the computervision community. the terabytes of visual information stored in digital image and video libraries will remain inaccessible if the problems of indexing and retrieval are not addressed. We present techniques for content based image retrieval using higher level contextual information. the content is represented and queried using attributed relational graphs, with colour attributes and relaxation labelling techniques. We present retrieval examples using both synthetic and real images of national flags. this, although a simplistic problem, highlights the shortcomings and difficulties associated with content based retrieval systems.
We address the application of computervision to semi-immersive teleconferencing, and present a prototype vision system synthesising a physically plausible video of a speaker to be displayed at a remote conferencing s...
详细信息
We address the application of computervision to semi-immersive teleconferencing, and present a prototype vision system synthesising a physically plausible video of a speaker to be displayed at a remote conferencing station. the main system components are a hierarchical, efficient large-baseline disparity estimation and a view synthesis module. We illustrate and discuss some results with a real-speaker sequence. We regard the development of such a system in the domain of advanced teleconferencing as the main contribution of this work.
暂无评论