Thomas Fidler

Learn More
Time seems to accelerate with increasing age. This subjective acceleration or compression may be due to the operation of a linear or a square-root function that relates present age to past age. A subjective magnitude-estimation technique was applied in a questionnaire given to 282 university students to determine which function best fitted the data. The(More)
Thermoacoustic computed tomography (thermoacoustic CT) has the potential to become a mayor non-invasive medical imaging method. In this paper we derive a general mathematical framework of a novel measuring setup introduced in [5]. It takes measuring data of line detectors and offers better imaging resolution than conventional approaches based on point-data(More)
  • T Fidler, M Grasmair, H Pottmann, O Scherzer
  • 2007
Recently, integral invariants and according signatures have been identified to be useful for shape classification, which is an important research topic in computer vision, artificial intelligence and pattern recognition. The modelling of integral invariants and signatures for shape analysis and in particular the analysis have not attracted attention in the(More)
We investigate the applicability of integral invariants as geometrical shape descriptors in the context of ill-posed inverse problems. We propose the use of a Tikhonov functional, where the penalty term is based on the difference of integral invariants. As a case example, we consider the problem of inverting the Radon transform of an object with only(More)
282 undergraduate students between 17 and 68 years of age were asked to list the 5 most significant experiences of their lives, to assign the time zones to these experiences, and to provide estimates of emotional valence corresponding to each significant life experience they listed. Subjects also provided judgements of time perspective on a Life Line. The(More)
  • 1