Københavns Universitet
Uafhængig af ledelsen


PhD defence by Hans Jacob Teglbjærg Stephensen

Ph.d.-forsvar — On 10 June, Hans Jacob Teglbjærg Stephensen will defend his thesis titled "Geometric Models and Stochastic Geometry of Subcellular Structures".


Date & Time:

Zoom: https://ucph-ku.zoom.us/j/68201315971

Hosted by:
Department of Computer Science



Geometric Models and Stochastic Geometry of Subcellular Structures


The analysis of the geometry of objects is a fundamental property with important interpretations in most fields of natural science. As the fields of bioimaging, biology and pathology evolve, so should the computational and statistical methods which we use for the correction of imaging artifacts and for measuring the stochastic variations in the shape of geometric objects of interest.

In this Ph.D. thesis, we present novel methods either using or measuring the geometry of objects with several applications in biology and pathology.
Firstly, we present a novel correction method for restoring drifted FIB-SEM volumes of neuronal data by using the vesicle, a small spherical object, as a stochastic model for translational correction of an image stack.

Secondly, we present measures and statistics to assess if and how the shape of an object might be dependent on the shape and spatial distance to some reference object. We derive edge correction terms and assess the inverse problem by deriving the equivalence class under the measure in a simplified example.

Third and finally, we present a measure and statistic for point patterns which has migrated from some common source point, but where the knowledge of the point locations is sparse, limited to parallel planes. By assuming a uniform distribution of points across spherical shells from the source point, we estimate the dense point statistic using the available information.


Assessment Committee

• Lektor, François Lauze, Department of Computer Science, UCPH
• Professor, Natasa Sladoje, Uppsala University, Department of Information Technology
• Professor, Kaleem Siddiqi, McGill University, School of Computer Science

Academic supervisor

Professor, Jon Sporring, IMAGE section, UCPH

Moderator at this defence will be

Associate Professor, Sune Darkner, IMAGE section, UCPH


This defence will be conducted online via Zoom: Click here to join.

For a digital copy of the thesis, please go to: https://di.ku.dk/english/research/phd/