We present a light position calibration technique based on a general arrangement of at least two reflective spheres in a single image. Contrary to other techniques we do not directly intersect rays for triangulation but instead solve for the optimal light position by evaluating the image-space error of the light highlights reflected from the spheres. This approach has been very successful in th...

We propose a novel calibration method for catadioptric systems made up of an axial symmetrical mirror and a pinhole camera with its optical center located at the mirror axis. The calibration estimates the relative camera/mirror position and the extrinsic rotation and translation w.r.t. the world frame. The procedure requires a single image of a (possibly planar) calibration object. We show how ...

We discuss the accuracy to which ALMA antenna relative positions can be determined via astronomical observations of phase and delay toward multiple strong calibrators. We show that delay induced phase gradients across the bandpass can be used to resolve turn ambiguities so that accurate delays can estimated from the phase. At low frequencies this demands only modest stability of the bandpass ph...

The aim of this paper is to improve the position accuracy of a six degree of freedom medical robot. The improvement in accuracy is achieved without the use of any external measurement device. Instead, this work presents a novel calibration approach based on using an embedded force-torque sensor to identify the robot's kinematic parameters and thereby enhance the positioning accuracy. A simulati...

In this paper a calibration method for on-board cameras used on the ARGO autonomous vehicle is presented. A number of markers have been placed on the vehicle’s hood, which is framed by the vision system. Thanks to the knowledge of the markers’ position it is possible to compute camera position and orientation with respect to the vehicle. Being based on fast computations, this procedure –of basi...

An inertial navigation system (INS) has been widely used in challenging GPS environments. With the rapid development of modern physics, an atomic gyroscope will come into use in the near future with a predicted accuracy of 5 × 10(-6)°/h or better. However, existing calibration methods and devices can not satisfy the accuracy requirements of future ultra-high accuracy inertial sensors. In this p...

The errors of inertial sensors affect the navigation accuracy of the strapdown inertial navigation system (SINS) and are accumulated over time in nature. In order to continuously maintain the high navigation accuracy of vehicles for a long time period, an initial alignment and self-calibration is necessary after the SINS starts. Additionally, the observability analysis is one of the key techniq...

Abstract: The existing popular methods of thermo vision camera calibration are for temperature range adjustment using reference temperature sources and test thermal images. Correct temperature calibration of a thermal or infrared camera allows the inspector to be certain of the temperature measurements presented in the thermal images given from a calibrated thermal or infrared camera. Also in e...

In orthopedic and trauma surgery, fracture reduction usually requires the use of metallic plates and their fixation by means of screws. The employment of guidance solutions during surgical procedures has become of great importance during the last decades. Our guidance solution exploits a small video camera placed directly on the instrument, for example a drill, and a set of small markers placed...

A growing number of modern applications such as position determination, object recognition and collision prevention depend on accurate scene analysis. The estimation of an object’s distance relative to an observers position by image analysis or laser scan techniques is thereby still the most time-consuming and expansive part. A lower-priced and much faster alternative is the distance measuremen...