Project

Distortions of digital images by the JPEG algorithm

Publisher

Supervisor

Location

Greater Copenhagen area

The JPEG algorithm is applied between two and four billion times a day, mainly on digital pictures taken by smartphones and digital cameras. The main design driver for the algorithm was to assure a compression without a significant loss of the visual quality of the pictures.  This is, of course, basically a subjective requirement.  The purpose of this project is to evaluate the performance of the JPEG algorithm following more objective criteria.

The basis for this investigation will be a set of deep broad band images, obtained with the Hubble Space Telescope. These images have been analysed in great detail exploiting the SExtractor software package. The performance of JPEG will be obtained by comparing the SExtractor results before and after the compression of the images by JPEG. The basic quantities to compare will be the point spread functions, the photometric accuracies and detection limits. The feasibility for applying JPEG on astronomical digital images will be discussed. 

In collaboration with

Birger Niss, NNIT A/S

Requirements

Programming

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Contact

Company / Organization

DTU Space

Name

Hans Ulrik Nørgaard-Nielsen

Position

Seniorforsker

Mail

hunn@space.dtu.dk

Supervisor info

BSc in Earth and Space Physics and Engineering

Supervisor

Hans Ulrik Nørgaard-Nielsen

ECTS credits

20 - 35

Type

BSc project, MSc thesis, Special course

BSc in Software Technology

Supervisor

Hans Ulrik Nørgaard-Nielsen

ECTS credits

20 - 35

Type

BSc project, MSc thesis, Special course

MSc in Digital Media Engineering

Supervisor

Hans Ulrik Nørgaard-Nielsen

ECTS credits

20 - 35

Type

BSc project, MSc thesis, Special course

Msc in Earth and Space Physics and Engineering

Supervisor

Hans Ulrik Nørgaard-Nielsen

ECTS credits

20 - 35

Type

BSc project, MSc thesis, Special course

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


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