M. Vaidelys “Self-organizing patterns in information hiding applications” doctoral thesis defence

Thesis Defense

Author, Institution: Martynas Vaidelys, Kaunas University of Technology

Science area, field of science: Physical Sciences,  Informatics, 09P

Summary of doctoral thesis: Summary

Scientific Supervisor: Prof. Dr. Habil. Minvydas Kazys Ragulskis (Kaunas University of Technology, Physical Sciences,  Informatics, 09P).

Dissertation Defence Board of Informatics Science Field:

Prof. Dr. Habil. Rimantas Barauskas (Kaunas University of Technology, Physical Sciences,  Informatics, 09P) – chairman,
Prof. Dr. Habil. Gintautas Dzemyda (Vilnius University, Physical Sciences, Informatics, 09P),
Prof. Dr. Vacius Jusas (Kaunas University of Technology, Physical Sciences,  Informatics, 09P),
Assoc. Prof. Dr. Kristina Poškuvienė (Kaunas University of Technology, Physical Sciences,  Informatics, 09P),
Prof. Dr. Miguel A.F. Sanjuan (Rey Juan Carlos University, Physical Sciences,  Informatics, 09P).

The doctoral dissertation is available on the internet and at the libraries of Kaunas University of Technology (K. Donelaičio str. 20, Kaunas), Vytautas Magnus Universitety (K. Donelaičio g. 52, Kaunas), and Vilnius Gediminas Technical University (Saulėtekio al. 14, 10223 Vilnius).

Annotation:

The complex self-organizing patterns emerging from the biological, chemical or physical processes have been successfully adapted for hiding and communicating secret visual information. Communication scheme between two communicating parties based on the calculation of difference between two patterns was presented. To form a self-organizing pattern mathematical models describing real-world processes are used. The pattern formation scheme based on breaking spiral waves allows to apply perturbations in the middle of the pattern formation process. This helps to increase the security of the scheme and to control the quality of the decoded image. DVC scheme based on the optical time-averaging moiré technique has been introduced to enable communication using only one image. An image encoding scheme in deformable one-dimensional moiré gratings oscillating according to a predefined Eigen-mode describing a physical process is implemented for the construction of two-dimensional digital dichotomous secret images. Here, the Eigen-shape of the structure serves as the decoding key for a visual communication scheme. Various pattern formation mechanisms and parameters result in different characteristic images which require the evaluation of complexity and feasibility for information hiding applications. It is important to consider the feasibility of an image used in secure communication. 2-LRS can be used to analyze the complexity of self-organizing patterns.

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