This paper presents an image-based visual servoing for controlling the position and orientation of an unmanned aerial vehicle (UAV) using a fixed downward camera observing landmarks on the level ground. In the proposed method, the visual servoing of the image moments is used to control the vertical motion and rotation around the roll axis. In contrast, an undesired positive feedback arises in v...

the paper presents the design of controller for wheeled mobile robots (WMRs) which continuously follows humans indoors in straight path only. This task uses computer vision in the controller feedback loop and is referred to as vision-based control or visual servo control. Typically, visual servo techniques can be categorised into image based visual servoing (IBVS) and position-based visual serv...

Analysis of lip motions can be deployed in a variety of applications, e. g. visual speech reading or liveness verification as part of a person authentication system. When utilizing appearance-based features to describe lip shapes (visemes), robustly detecting the position of the mouth center is an inevitable part of this task. In this paper we present an algorithm for mouth localization as part...

Ubiquitous positioning is considered to be a highly demanding application for today's Location-Based Services (LBS). While satellite-based navigation has achieved great advances in the past few decades, positioning and navigation in indoor scenarios and deep urban areas has remained a challenging topic of substantial research interest. Various strategies have been adopted to fill this gap, with...

Stabilizing the visual system is a crucial issue for any sighted mobile creature, whether it will be natural or artificial. The more immune the gaze of an animal or a robot is to various kinds of disturbances (e.g., those created by body or head movements when walking or flying), the less troublesome it will be for the visual system to carry out its many information processing tasks. The gaze c...

Visual position and velocity cues improve human standing balance, reducing sway responses to external disturbances and sway variability. Previous work suggested that human balancing is based on sensory estimates of external disturbances and their compensation using feedback mechanisms (Disturbance Estimation and Compensation, DEC model). This study investigates the visual effects on sway respon...

Despite growing evidence for perceptual interactions between motion and position, no unifying framework exists to account for these two key features of our visual experience. We show that percepts of both object position and motion derive from a common object-tracking system--a system that optimally integrates sensory signals with a realistic model of motion dynamics, effectively inferring thei...