ALGORITHMS FOR IMAGE PROCESSING OF CROWDED FIELDS IN ASTRONOMY
Type of document
disertační práceAuthor
Blažek, Martin
Supervisor
Páta, Petr
Vítek, Stanislav
Field of study
RadioelektronikaStudy program
Elektrotechnika a informatikaInstitutions assigning rank
České vysoké učení technické v Praze. Fakulta elektrotechnická. Katedra radioelektronikyMetadata
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This thesis deals with the image processing of so called crowded fields. These objects (such as Globular
or Open stellar clusters) in astronomical images represent extremely dense and concentrated stellar
fields and they are extremely difficult to analyse. This thesis brings detail analysis of this phenomena
together with the description of the problem and suggestion of several new approaches and algorithms.
The presented WHIDE algorithm (Weighed and Histogram Thresholded Deconvolution) deals with
crowded fields by using both known (mathematical deconvolution, aperture and profile photometry,
Nelder-Mead optimization, ...) and new approaches. The research about the application of standard
image processing methods in astronomy and other fields is presented together with simulations and
the analysis which helps in designation of the new algorithms. For these simulations new simulator
of astronomical images (including instrumental errors and defects) with crowded fields called GlencoeSim
is used. The suggested WHIDE algorithm uses as well two new approaches in data reduction -
”Flux Histogram Noise Thresholding” and Statistical weighing of deconvolution results. These methods
allow the deconvolution process to be automatic and reliable and deal with both the noise and the
deconvolution artefacts.
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