Multi-view shape-from-silhouette systems are increasingly used for analysing stones. This thesis presents methods to estimate stone shape and to recognise individual stones from their silhouettes. Calibration of two image capture setups is investigated. First, a setup consisting of two mirrors and a camera is introduced. Pose and camera internal parameters are inferred from silhouettes alone. S...

Silhouette information is important in many applications such as virtual reality and visual hull construction. However, silhouette extraction from images relies on a known background. In this paper, we propose a method for silhouette extraction from an arbitrarily unknown background. To do this, we use multiple calibrated images. Each input image is first segmented in regions. Then, the consist...

This paper presents human body posture estimation methods based on analysis of human silhouette and investigates their characteristics. Two types of estimation method are presented: one method is based on both the heuristically extraction method of estimating the significant points of human body and the contour analysis of the human silhouette, and the other is using artificial neural network. ...

Conspicuous and visually unpleasant polygonal silhouettes are often produced when rendering a polyhedral approximation (i.e. a polygonal mesh) of a smooth surface model, regardless whatever shading method is used to improve the appearance of the interior region. We present in this paper a technique for displaying a coarse polygonal mesh with smooth silhouette. Unlike other existing methods that...