Bernd Krolla

Learn More
The development of innovative terahertz (THz) imaging systems has recently moved in the focus of scientific efforts due to the ability to screen substances through textiles or plastics. The invention of THz imaging systems with high spatial resolution is of increasing interest for applications in the realms of quality control, spectroscopy in dusty(More)
In this work, we introduce a light field acquisition approach for standard smartphones. The smartphone is manually translated along a horizontal rail, while recording synchronized video with front and rear camera. The front camera captures a control pattern, mounted parallel to the direction of translation to determine the smartphones current position. This(More)
We present different metamaterial-based optical components that open exciting new ways to deliberately manipulate the spatial or spectral properties of terahertz (THz) radiation. The central scope of the paper is the design, fabrication and optical characterization of a 3-layer gradient index (GRIN) lens that allows one to strongly focus THz radiation to a(More)
Pose uncertainty estimation of calibrated cameras is a common task in the field of computer vision and uses location uncertainties of image features. For spherical cameras, those uncertainties cannot be optimally described using conventional latitude-longitude representation. Increasing distortions close to the poles of the spherical coordinate system(More)
We present a novel, robust guided matching technique. Given a set of calibrated spherical images along with the associated sparse 3D point cloud, our approach consistently finds matches across the images in a multilayer feature detection framework. New feature matches are used to refine existing 3D points or to add reliable ones to the point cloud,(More)
  • 1