Figure 1. The use of visual servo control for helicopter stabilization-Design and Implementation of a Fully Autonomous UAV's Navigator Based on Omni-directional Vision System

<p>Visual servoing is an approach to control motion of a helicopter using information feedback<br> from a camera mounted on it. For their tremendous potential applications in various areas including<br> environmental monitoring and anti-terrorism, unmanned small helicopters are being extensively<br> studied in robotics and control in recent years. However, the research advance in dynamic control of<br> small helicopters is limited due to highly coupled non- linear dynamics and the existence of various<br> uncertain- ties. Many people studied controller design based on a Publisher Item Identifier.<br> linearized or simplified model, but the controllers developed under linearized models cannot<br> guarantee dynamic stability rigorously. Another effort is application of modern non-linear control<br> theory to helicopter control because small helicopter are good test beds for sophisticated control<br> techniques for their small size and highly coupled dynamics [4].</p>