Thesis defence in the University of Oulu

Doctoral Candidate

M.Sc (Tech) Jarkko Vatjus-Anttila

Faculty and research unit

University of Oulu Graduate School, Faculty of Information Technology and Electrical Engineering, Information Science

Field of study

Computer Science

Date and time of the thesis defence

28.2.2020 12:15

Place of the thesis defence

IT115, Linnanmaa

Topic of the dissertation

Energy efficient rendering of extensible 3D virtual environments on mobile devices

Opponent

Professor Tapio Takala, Aalto University

Custos

Professor Juha Röning, Univesity of Oulu

Energy savings for mobile applications by simplifying graphics automatically

This thesis focus its research to mobile applications, which use three dimensional graphics for the application visualization. This specific graphics type can be burdensome to handle for a mobile device, especially if the application which uses it is also available for a more powerful computer. Three dimensional virtual spaces or games are an example of such applications. The graphics content can be manipulated prior to delivery for the mobile device and if manipulated properly, running the application in the best case is no longer so burdensome anymore. This will lead to energy savings and hence to longer use time of such applications and better end-user experience. Graphics manipulation can also have unwanted side effects because when it is automatically manipulated quality degradation can appear. If the amount of degradation is too much it will affect negatively to the user experience.

The thesis has also this viewpoint: how much graphics manipulation is too much before is becomes unacceptable. The thesis focuses on methods which modify and simplify graphics and it also has a focus on application architecture: how the application graphics distribution should be built so that the mobile devices gain the benefit. The results present the mentioned distribution architecture and measurement results which show up to 50% energy savings when the methods are applied as proposed in the thesis.

Dissertation

Last updated: 18.2.2020