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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Fourier methods of eliminating optical artifacts in SOHO EIT images
 Satýnek, Daniel ; Kosová, Petra (referee) ; Druckmüllerová, Hana (advisor)
This thesis deals with the application of the two-dimensional discrete Fourier transform for the processing and analysis of image data from a space telescope. A method will be described that is used to eliminate periodic artifacts caused by narrow-band pass filters in images from the SOHO EIT spacecraft. The design of a filter in the frequency domain to suppress periodic noise in the image is discussed. Proposed method calculates the amplitudes of the filtered frequencies based on an approximation of the surrounding amplitudes. The algorithm of the method and how to set its parameters will be described.
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