ABSTRACT Quad-tree structured motion-compensation technique effectively utilizes the motion content of a frame as oppose to fixed size block motion compensation technique. In this paper, we propose a novel quad-tree-structured region-wise motion compensation technique that divides a frame into equilateral triangle blocks using the quad-tree structure. Arbitrary partition shapes are achieved by ...

We present control methods for an autonomous four-rotor helicopter, called a quadrotor, using visual feedback as the primary sensor. The vision system uses a ground camera to estimate the pose (position and orientation) of the helicopter. Two methods of control are studied one using a series of mode-based, feedback linearizing controllers, and the other using a backstepping-like control law. Va...

Zusammenfassung: Das multimedia lecture board (mlb) ist ein sogenanntes Shared Whiteboard und ermöglicht die Präsentation und die gemeinsame Bearbeitung von Dokumenten in computergestützten Videokonferenzen. Es wurde im Rahmen des DFN-Projekts “ANETTE” speziell für den Einsatz in TeleteachingVeranstaltungen entwickelt und findet seit dem Sommersemester 2001 Verwendung an verschiedenen Universit...

OBJECTIVE To determine if there is a significantly different effect on vertical changes during phase I palatal expansion treatment using a quad helix and a bonded rapid maxillary expander in growing skeletal Class I and Class II patients. MATERIALS AND METHODS This retrospective study looked at 2 treatment groups, a quad helix group and a bonded rapid maxillary expander group, before treatmen...

The quad processor core is a design philosophy that has become a mainstream in Scientific and engineering applications. Increasing performance and gate capacity of recent FPGA devices permit complex logic systems to be implemented on a single programmable device. The Embedded multiprocessors face a new problem with thread safety [5]. It is caused by the shared memory, when thread safety is viol...

BACKGROUND Our objectives are to analyse and to compare the stress distribution and displacement of the craniofacial structures, following the application of forces from quad-helix and Nickel Titanium Palatal Expander-2 (NPE2) using finite element analysis. METHODS Three-dimensional finite element models of young dried human skull, quad-helix appliance and NPE2 were constructed, and the initi...

We propose a new technique for quad-dominant remeshing which separates the local regularity requirements from the global alignment requirements by working in two steps. In the first step, we apply a slight variant of variational shape approximation in order to segment the input mesh into patches which capture the global structure of the processed object. Then we compute an optimized quad-mesh f...

The detection of broken rotor bars in three-phase squirrel cage induction motors by means of current signature analysis is presented. In order to diagnose faults, a Neural Network approach is used. At first the data of different rotor faults are achieved. The effects of different rotor faults on current spectrum, in comparison with other fault conditions, are investigated via calculating Power ...