Precision positioning and manipulation systems often rely on data from sensors delivering a sinusoidal signal pair. These signals can be interpolated to provide a high resolution measurement. The paper presents a novel method for removing signal differences and drifts by automatic self-calibrating the sinusoidal signal pair. Then, manual calibration is avoided and slow varying effects, like the...

Navigation systems based on intra-operative ultrasound have been introduced for different surgical procedures and interventions. The accuracy of the ultrasound probe calibration is a main contribution to the overall accuracy of the navigation system. Different calibration methods based on phantoms have been introduced. The challenge of the calibration procedure is to identify the phantom struct...

A way of frequency calibration using jizqv logic controller (FLC) is presented in this paper. Generally, atomic clocks tend to drzfr due to temperature, aging, or some emironmental eflects. It is sure that one cannot compensate for the drift with a fuced amount of control quantity. As a controller, it has the task to adaptively catch up with the vurzation. Our approach takes advantage of FLC to...

BACKGROUND Recently, digital photography in medicine is considered an acceptable tool in many clinical domains, e.g. wound care. Although ever higher resolutions are available, reproducibility is still poor and visual comparison of images remains difficult. This is even more the case for measurements performed on such images (colour, area, etc.). This problem is often neglected and images are f...

This paper attacks the problem of automatic calibration of a mobile robot in an indoor environment. The problem is that the robot must locate itself accurately with respect to given landmarks, before it starts to navigate. In this paper, we examine the problem in a special case, where the ground plane is assumed to be horizontal and there are two locally parallel sidelines available. This assum...

We present a color calibration pipeline for large camera arrays. We assume static lighting conditions for each camera, such as studio lighting or a stationary array outdoors. We also assume we can place a planar calibration target so it is visible from every camera. Our goal is uniform camera color responses, not absolute color accuracy, so we match the cameras to each other instead of to a col...

The paper describes a new system that automatically calibrates the linearity of a resistance thermometry bridge or readout. A thermometry bridge, like all measuring and test equipment, must be regularly tested to ensure it is operating properly and accurately. Previously, this could only be done using special equipment and time-consuming procedures. The new technique described in the paper faci...

In recent years, the advances in projection technology and the increasing rendering capacity of modern computers allowed the development of immersive digital domes. Digital dome systems are not limited to planetariums, but also find their way into science centers, theme parks, or multimedia events. However, most installations do not support 3D stereoscopic display, because of the difficulties t...

The problem of particle number density measurements with a laser Doppler anemometer is addressed. Analytical expressions for the instrument measurement cross section are given. An automatic calibration method for determining unknown scattering parameters, which promises good accuracy in changeable optical conditions, is described. Estimates of the measurement uncertainty are derived and the met...

Fu-Chao Wu Institute of Automation Chinese Academy of Science National Laboratory of Pattern Recognition Beijing, China Abstract. We present a method for automatic camera calibration that requires only that a planar pattern be visible by the camera from a few (at least three) different views. A major issue is how to obtain the projection of an absolute point using the planar pattern. In the cal...