We have successfully built and operated a source deployment system for the KamLAND detector. This system was used to position radioactive sources throughout the delicate 1-kton liquid scintillator volume, while meeting stringent material cleanliness, material compatibility, and safety requirements. The calibration data obtained with this device were used to fully characterize detector position ...

Cone-beam computed tomography systems have been developed to provide in situ imaging for the purpose of guiding radiation therapy. Clinical systems have been constructed using this approach, a clinical linear accelerator (Elekta Synergy RP) and an iso-centric C-arm. Geometric calibration involves the estimation of a set of parameters that describes the geometry of such systems, and is essential...

In this paper we propose an approach to retrieve the geometry of an acoustic sensor network consisting of spatially distributed microphone arrays from unconstrained speech input. The calibration relies on Direction of Arrival (DoA) measurements which do not require a clock synchronization among the sensor nodes. The calibration problem is formulated as a cost function optimization task, which m...

We study the control of a robot arm with an eye-in-hand camera, using structured light with a projector in a fixed but unknown position. Based on the theory of perfect maps, we propose a deterministic method to generate patterns independent of the relative 6D orientation between the camera and the projector, with any alphabet size and minimal Hamming distance between the codes. This independenc...

Three-dimensional (3-D) ultrasound (US) is an emerging new technology with numerous clinical applications. Ultrasound probe calibration is an obligatory step to build 3-D volumes from 2-D images acquired in a freehand US system. The role of calibration is to find the mathematical transformation that converts the 2-D coordinates of pixels in the US image into 3-D coordinates in the frame of refe...

This paper proposes a new approach to mobile robot navigation using 3D vision and artificial landmarks. The Photo Mixer Device (PMD) technology, working on the principle of time of flight (TOF), provides the capability for the position calibration of a mobile robot in an indoor environment. In this work, the PMD camera, which provides a distance value for each pixel, results in an innovation in...

Calibration is the transformation of the output channels of a measuring device into the physical values (energies, times, angles etc.) It is a laborand time-consuming task even if only few detectors are used. However, the situation changes appreciably if the calibration of a multi-detector system is required, where the number of registering devices extends for hundreds [1]. Let us have a look a...

Spatially coordinated behavior is possible only because many features of the body's structure and of the structure of the world are highly predictable. From the primitive chaos of the impressions collected by our sense organs, a system of stable and permanent spatial referents progressively emerges in relation to the moving and ever-changing framework of bodily positions. The prerequisite to th...

Getting 3D information from 2D images depends on the appropriate camera calibration of the internal and external CCD (Charge Couple Device) camera parameters. The photogrammetric camera calibration technique needs a set of world coordinates and their corresponding calibration object image coordinates as an input. During this work we developed an algorithm to detect the image coordinates of a ca...

In this paper a detailed simulation of irradiated pixel sensors was used to investigate the effects of radiation damage on charge sharing and position determination. The simulation implements a model of radiation damage by including two defect levels with opposite charge states and trapping of charge carriers. We show that charge sharing functions extracted from the simulation can be parameteri...