Following Futurism, we show how periodic motions can be represented by a small number of eigen-shapes that capture the whole dynamic mechanism of periodic motions. Spectral decomposition of a silhouette of an object in motion serves as a basis for behavior classiÿcation by principle component analysis. The boundary contour of the walking dog, for example, is ÿrst computed eÆciently and accurate...

Handwriting Recognition generally uses a dictionary : in the case of large vocabularies, our system helps checking the existence of the words provided by the recognizer, or when there is a model to go through per word, it will reduce the number of models to go through. In the case of smaller vocabularies it can be used as a recognizer. From the signal provided by a digitizing tablet we build a ...

We investigate a silhouette puzzle that is recently developed based on the golden ratio. Traditional silhouette puzzles are based on a simple tile. For example, the tangram is based on isosceles right triangles; that is, each of seven pieces is formed by gluing some identical isosceles right triangles. Using the property, we can analyze it by hand, that is, without computer. On the other hand, ...

In this paper we present a new approach to high quality 3D object reconstruction. Starting from a calibrated sequence of color images, the algorithm is able to reconstruct both the 3D geometry and the texture. The core of the method is based on a deformable model, which defines the framework where texture and silhouette information can be fused. This is achieved by defining two external forces ...

This paper develops a biometric gait recognition system based on 3D video acquired by a Time-of-Flight (ToF) sensor providing depth and intensity frames. A first step of the proposed gait analysis is the automatic extraction of the silhouette of the person via segmentation. The segmentation of the silhouette is performed on the depth frame which provide information which describes the distance ...

A system for enhancing the situational awareness in an outdoor scenario by Augmented Reality (AR) techniques can utilize visual clues for improving registration precision. If visible, terrain silhouettes provide unique features to be matched with digital elevation map (DEM) data. The best match of a visually extracted silhouette with the DEM silhouette provides camera/observer orientation (elev...

Extracting a human silhouette from a video sequence is the enabling step for many high-level vision processing tasks, such as people tracking, video surveillance, and mobility assessment. Silhouette extraction schemes are widely explored in the literature, but most approaches work efficiently only in constrained environments where the background is relatively static. How to accurately and effec...