Video Hyper-links Creation for Content-Based Browsing and Navigation

in Proc. Workshop on Content-Based Multimedia Indexing, CBMI'99 Abstract This paper describes an original approach for automatically building a navigation tool within a video. It aims at determining e cient representations of a video, in the context of contentbased video browsing, relying on the creation of hyper-links between elementary shots of a video. We exploit matching techniques applied either on extracted meaningful entities (mobile objects) or on panoramic views of the scene. We present experiments on a real image sequence and discuss the extension of the method to navigation in a video database. 1 Introduction and related work Video structuring issues are of key importance for browsing, content-based retrieval or navigation. High level knowledge formalisms enable to tackle these issues, exploiting for instance semantic networks. For instance, [12] distinguishes ve levels of codi cations for cinematic levels to formalize a general system using video data for program synthesis, video search orcontent-based retrieval. The corresponding encode

Video Hyper-link Creation for Content-Based Browsing and Navigation

International audienceThis paper describes an original approach for automatically building a navigation tool within a video. It aims at determining efficient representations of a video, in the context of content- based video browsing, relying on the creation of hyper-links between elementary shots of a video. We exploit matching techniques applied either on extracted meaningful entities (mobile objects) or on panoramic views of the scene. We present experiments on a real image sequence and discuss the extension of the method to navigation in a video database

Simultaneous Object Pose and Velocity Computation Using a Single View from a Rolling Shutter Camera

An original concept for computing instantaneous 3D pose and 3D velocity of fast moving objects using a single view is proposed, implemented and validated. It takes advantage of the image deformations induced by rolling shutter in CMOS image sensors. First of all, after analysing the rolling shutter phenomenon, we introduce an original model of the image formation when using such a camera, based on a general model of moving rigid sets of 3D points. Using 2D-3D point correspondences, we derive two complementary methods, compensating for the rolling shutter deformations to deliver an accurate 3D pose and exploiting them to also estimate the full 3D velocity. The first solution is a general one based on non-linear optimization and bundle adjustment, usable for any object, while the second one is a closed-form linear solution valid for planar objects. The resulting algorithms enable us to transform a CMOS low cost and low power camera into an innovative and powerful velocity sensor. Finally, experimental results with real data confirm the relevance and accuracy of the approac