We describe an algorithm for detecting and tracking multiple people in a cluttered scene using multiple synchronized cameras located far away from each other. This camera arrangement results in multiple wide-baseline camera systems. We segment each image, and then, for each pair we compare regions across the views along epipolar lines. The centers of the matching segments are then back-projecte...

Introduction. A pseudoline is formed from a line by stretching the plane without tearing: it is the image of a line under a homeomorphism of the plane [13]. In arrangements of pseudolines, pairs of pseudolines intersect at most once and cross at their intersections. Pseudoline arrangements can be used to model sorting networks [1], tilings of convex polygons by rhombi [4], and graphs that have ...

We generalize the Hadwiger theorem on line transversals to collections of compact convex sets in the plane to the case where the sets are connected and the transversals form an arrangement of pseudolines. The proof uses the embeddability of pseudoline arrangements in topological affine planes. In 1940 Santaló showed [8], by an example, that Vincensini’s proof [9] of an extension of Helly’s theo...

Let G be a graph embedded in the plane and let A be an arrangement of pseudolines intersecting the drawing of G. An aligned drawing of G and A is a planar polyline drawing Γ of G with an arrangement A of lines so that Γ and A are homeomorphic to G and A. We show that if A is stretchable and every edge e either entirely lies on a pseudoline or intersects at most one pseudoline, then G and A have...

Improvement of tracking accuracy is an important issue when applying augmented reality to nuclear power plant fieldwork. Tracking accuracy depends highly on the marker arrangement when employing a tracking method using a camera and markers. For those reasons, this study develops a wheel tracking error computation method to compute the tracking error from the marker arrangement and errors in the...

Pin&Play has enabled a new type of surface-based physical user interface, characterised by dynamic arrangement of interface objects on a surface area. Previous work has shown that this affords rapid re-arrangement of the spatial layout of interface objects, for example in adaptation to user preferences, but the Pin&Play system did not support tracking of object locations on the surface. In this...

A fast camera calibration technique to estimate the center of perspective projection of an imaging camera has been described. The proposed technique requires a single image of two planar calibration charts arranged in a special manner. The special arrangement of the calibration charts simplifies the projection equations relating the 3-D scene coordinates to the 2-D image coordinates and they ca...

In this report, we present a method of position detection for a low-cost camera-pen. Our method allows reconstruction of handwriting, as well as retrieval of the particular document that is being written onto. For this matter, we use a point pattern printed onto the document’s background, which is indexed using Locally Likely Arrangement Hashing. For position detection, the dot pattern is extra...

A lateral vehicle localization method by omni-image analysis is proposed for car driving assistance. The method estimates analytically the position and orientation of a lateral vehicle by utilizing the geometric properties of a circular-shaped wheel image of the lateral car taken by a single omni-camera with a hyperboloidal-shaped mirror. Analytical solutions are made possible for fast computat...

The use of a single camera and rotating mirror for depth estimation in a periscope-like system is examined. It is found that such an arrangement is viable and that the problem of matching features in successive frames may be greatly simplified by comparatively straightforward pre-processing. Experimental results are presented and some possible applications of such a compact stereo sensor are ou...