For human-robot interaction in industrial applications, monitoring the robot surroundings is essential in order to guarantee the safety of humans sharing the workspace with robots. This contribution presents an approach for obstacle detection and tracking based on the fusion of multiple heterogeneous depth sensors which are mounted on board a mobile manipulator. The proposed methods can track a...

Light eld rendering allows fast visualization of complex scenes by view interpolation from images of densely spaced camera viewpoints. The light eld data structure requires calibrated viewpoints, and rendering quality can be improved substantially when local scene depth is known for each viewpoint. In this contribution we propose to combine light eld rendering with a geometry-based structure-fr...

A method for hand-eye calibration using only normal ow measurements, i.e. only the spatial and temporal intensity derivatives in an image sequence, is presented. As a bi-product we will recieve an approximate depth map of the current scene. The method does not rely in any stage on the detection and matching of features and is in no need of a special calibration object. The method is an active r...

For on-orbit calibration of the Beijing-1 multispectral imagers (Beijing-1/MS), a field calibration campaign was performed at the Dunhuang calibration site during September and October of 2008. Based on the in situ data and images from Beijing-1 and Terra/Moderate Resolution Imaging Spectroradiometer (MODIS), three vicarious calibration methods (i.e., reflectance-based, irradiance-based, and cr...

For structured light system calibration, one popular approach is to treat the projector as an inverse camera. This is usually performed by projecting horizontal and vertical sequences of patterns to establish one-to-one mapping between camera points and projector points. However, for a well-designed system, either horizontal or vertical fringe images are not sensitive to depth variation and thu...

In-depth distribution of doping elements in shallow depth region is an important role of secondary ion mass spectrometry (SIMS) for the development of next-generation semiconductor devices. KRISS has developed two types of multi-layer reference materials by ion beam sputter deposition. A multiple delta-layer reference material where the layers of one element are very thin can be used to evaluat...

The Radiological Physics Center, through its dosimetry review visits to participating institutions, is aware that many institutions ignore the field-size and depth dependence of wedge transmission values. Reference wedge transmission values are normally measured by the Radiological Physics Center for a 10 cm x 10 cm field at the calibration depth of 5 or 7 cm. Recently, additional measurements ...

Time-of-flight cameras provide depth information, which is complementary to the photometric appearance of the scene in ordinary images. It is desirable to merge the depth and colour information, in order to obtain a coherent scene representation. However, the individual cameras will have different viewpoints, resolutions and fields of view, which means that they must be mutually calibrated. Thi...