Hier am Institut bieten wir laufend hochaktuelle Themen für Abschlussarbeiten an. Die hier aufgeführten Themenvorschläge sind in der Regel eng mit dem Arbeitsgebiet des betreuenden Assistenten verknüpft und ermöglichen Ihnen die Mitarbeit an zukunftsweisenden Technologien. Bei Interesse an einem der Vorschläge oder an einzelnen Themengebieten freuen sich die jeweiligen Assistenten über Anfragen.

Bei allgemeinen Fragen zur Koordination von Abschlussarbeiten steht Ihnen Dominik Mehlem gerne zur Verfügung.

Hier ist eine Liste unserer aktuell angebotenen Themen:

Video Coding

Neural-network-based video intra prediction Maria Meyer M.Sc.

A fundamental part of each image or video coding algorithm are methods that try to predict parts of the frames or images based on the information that was coded beforehand in order to significantly reduce the redundancy. These methods can be classified into two basic categories: Inter prediction methods that use information from previous frames and intra prediction methods that only information from the local neighborhood within the same frame.
While conventional intra prediction methods determine the prediction based on a set of linear filters, some recent proposals started to use neural networks for this purpose. In particular it is possible to train a convolutional neural network (CNNs) to predict a block based on its local neighborhood and use the result as an additional prediction option in a video coder. Unlike the conventional methods, these CNNs can usually adopt to nonlinear edges and textures. However, there is still much room for improvement in the training techniques and inference optimization processes.
There are frequently thesis topics coming up in this general area. Please ask, if you are interested in the general area.

Suitable for Bachelor and Master theses.

Bio Signal Processing and Communication

Compression of Genomic Sequences Jens-Rainer Ohm, Christian Rohlfing

Next Generation Sequencing (NGS) technologies enable the usage of genomic information as everyday practice in several fields, but the growing volume of data generated becomes a serious obstacle for a wide diffusion. Therefore, efficient compression of genomic data is a critical element whose lack is currently limiting its application potential.

Several master theses are offered or subsequently planned in this area; candidate students should have solid knowledge and skills in mathematics for signal analysis and processing, with emphasis on coding/compression, as well as similarity analysis of discrete sample-patterns/letter-strings (Note: This could also be transferred from the background of areas such as audio or video signal processing/compression).

The following concepts are planned to be investigated in detail:

  • Complex (amplitude/phase) signal representations for compression of nucleotide sequences
  • Statistical analysis of nucleotide sequences at local and global levels in signal domain and Fourier domain, identification of “coding regions”
  • Methods of grouping nucleotides into “codons” for optimum compression
  • Fast matching procedures for read pairs
  • Joint compression of genomic information and associated quality values of the reads

Comparison of developed genomic compression methods is planned to be performed against the benchmark of the emerging MPEG-G standard (ISO/IEC 23092-2).

Suitable for Master theses.

Point Cloud Compression

The general idea of point cloud compression is to find a representation of a point cloud which is less data exhaustive than the original raw point cloud. Currently, in MPEG (Moving Picture Experts Group) there are two different point cloud compression standards being developed, which will most likely be the new state-of-the-art for the next years. One standard is called video-based point cloud compression (V-PCC) and focuses on the compression of dynamic point cloud sequences (i.e. point cloud “video”). Here, the point cloud is projected onto a 2D canvas and the so created video streams are then compressed by a conventional video coder. The other standard is called geometry-based point cloud compression (G-PCC) and currently focuses on compression of static point clouds. Here, the point cloud is compressed with the help of conventional 3D tools, i.e. the use of an octree to iteratively split the point cloud into 8 subblocks.

Machine/Deep learning-based Approaches for Point Cloud Compression

Dominik Mehlem M.Sc.

In recent years, first approaches for autoencoder-based approaches showed to outperform the traditional approaches from a RD-based perspective. Still these approaches show promising opportunities for further research.

Possible topics could include, but are not limited to:

  • Improve on the already proposed autoencoder architectures to more efficiently compress the geometry/texture and/or make them more efficient in terms of computational complexity
  • Test and/or design perceptual cost functions to further improve the training of networks
  • Design architectures and/or approaches to code the geometry as well as the attributes (for example the color information of the point cloud) in a combined manner
  • Provide hybrid approaches with the conventional point cloud compression standards that allow for scalability (in quality and resolution/size) to benefit of the advantages of both worlds

Over time there might be different and more diverse topics be available in this area. When interested please feel free to reach out to me, so that we can further discuss details.

Suitable for Bachelor and Master theses.