Polymers that allow the adjustment of Shape-Memory properties by the variation of physical parameters during programming are advantageous compared with their counterparts requiring synthesis of new material. Here, we explored the influence of hydrolytic (physical) aging on the Shape-Memory properties of the polyetherurethane system Estane, programmed in repeated thermomechanical cycles under to...

This paper presents a novel modeling algorithm that is capable of simultaneously recovering correct shape geometry as well as its unknown topology from arbitrarily complicated datasets. Our algorithm starts from a simple seed model (of genus zero) that can be arbitrarily initiated by users within any dataset. The deformable behavior of our model is governed by a locally defined objective functi...

1: A new approach is presented for recovering shapes from noisy images. First, an edge-strength function, v, at every pixel is determined by implementing a segmentation functional. Then, the zero-crossings of the laplacian of the smoothed image are allowed to evolve under the influence of v. Each point on the zero-crossings moves in the direction of the normal with a velocity consisting of two ...

Given two arbitrary views of a scene under central projection, if the motion of points on a parametric surface is compensated, the residual parallax displacement eld on the reference image is an epipolar eld. The parallax magnitude at a point, after suitable scaling, is an a ne invariant; if the surface aligned is a plane, it is directly proportional to the height of the point from the plane an...

Deriving human body shape and motion from optical or magnetic motion-capture data is an inherently difficult task. The body is very complex and the data is rarely error-free and often incomplete. The task becomes even more difficult if one attempts to use video-data instead, because it is much noisier. In the last few years, we have developed techniques that use sophisticated human animation mo...

Shadows usually cause various problems in three-dimensional shape recovery and measurement methods. In particular shading based approaches such as shape-from-shading or the photometric stereo method produce no or wrong results if the shadows are not treated appropriately. We show how information extracted from shadows can be employed to reduce the problems caused by them. This is done for multi...

Fact,orization is one of the most practical lnethocl to recover 3D shape arid motion simultaneously fro111 2D images with stable and fast computation. However, there still remain two crucial problems to be solved in real situations; one is to determine the true shape from a pair of visually equivalent candidates and the other is to measure the actual size of the object. This paper presents a me...

The projected deformation of stationary contours and markings on object surfaces is analyzed in this paper. It is shown that given a marked point on a stationary contour, an active observer can move deterministically to the osculating plane for that point by observing and controlling the deformation of the projected contour. Reaching the osculating plane enables the observer to recover the obje...

Precise measurements of geometry should accompany robotic equipments in operating rooms if their advantages are further pursued. For deforming organs including the liver, intraoperative geometric measurements play an essential role in computer surgery in addition to preoperative geometric information from CT/MRI. The laser-scan endoscope system acquires and visualizes the shape of the area of i...

In this paper we consider the problem of extracting the shape of a smooth convex solid, V ⊂ R, from a set of N photographs. The method begins by extracting the edges of each photograph. These edges are used to form a cone whose apex is the camera centre, which is guaranteed to enclose V . For a strictly convex solid any two such cones will most likely touch at two places [3], whose coordinates ...