Conics-based homography estimation from invariant points and pole-polar relationships

In this paper we derive a novel set of projective invariants and we address the problem of homography estimation between two uncalibrated views from two unmodeled coplanar conics. Exploring in each view the eigenvectors of a matrix composed from the conics matrices and pole-polar relationships, we show that homography can be recovered purely geometrical from invariant points and simple intersections avoiding high-order polynomials and non linear equations. Our method has advantages compared with other approaches, is simple and computational efficient. The estimation process is basically linear and there are no ambiguities on the solution. Furthermore it requires neither that the physical models of the conics are known nor that the cameras are calibrated. Experimental results in both simulate data and real images show that our approach is very robust and can be efficiently used for a large number of applications

Dinarchi Orationes cum fragmentis /

Text in Greek, with pref. and notes in Latin.Bibliography: p. xiii-xv.Includes index.On p. preceding title p.: Akademie der Wissenschaften der DDR Zentralinstitut fur̈ alte Geschichte und Archaölogie

Mixed reality with moveable 3D see-through display and video-based object tracking

This paper presents a novel moveable mixed reality system with video-based tracking. The system consists of a high resolution video display which is mounted on the end effector of a passive kinematics chain with revolving joints. The monitor shows the live video stream with additional information superimposed in correct perspective onto the live scene. The user can freely move the system within a large work envelope and observe the target object from different viewpoints. Video and modelbased object tracking is applied to accurately recover metric information approximately in real time. Experimental results show that the system can be efficiently used for a number of applications including maintenance and repair, product design, and entertainment