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Theses/Dissertations

Communications and signal processing

Astrophysics and Astronomy

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Full-Text Articles in Engineering

Pattern Recognition And Image Processing Of Infrared Astronomical Satellite Images , Lun Xiong He Jan 1996

Pattern Recognition And Image Processing Of Infrared Astronomical Satellite Images , Lun Xiong He

Retrospective Theses and Dissertations

The Infrared Astronomical Satellite (IRAS) images with wavelengths of 60 [mu] m and 100 [mu] m contain mainly information on both extra-galactic sources and low-temperature interstellar media. The low-temperature interstellar media in the Milky Way impose a "cirrus" screen of IRAS images, especially in images with 100 [mu] m wavelength. This dissertation deals with the techniques of removing the "cirrus" clouds from the 100 [mu] m band in order to achieve accurate determinations of point sources and their intensities (fluxes). We employ an image filtering process which utilizes mathematical morphology and wavelet analysis as the key tools in removing the ...


Image Analysis, Modeling, Enhancement, Restoration, Feature Extraction And Their Applications In Nondestructive Evaluation And Radio Astronomy , Yi Zheng Jan 1987

Image Analysis, Modeling, Enhancement, Restoration, Feature Extraction And Their Applications In Nondestructive Evaluation And Radio Astronomy , Yi Zheng

Retrospective Theses and Dissertations

The principal topic of this dissertation is the development and application of signal and image processing to Nondestructive Evaluation (NDE) and radio astronomy;The dissertation consists of nine papers published or submitted for publication. Each of them has a specific and unique topic related to signal processing or image processing in NDE or radio astronomy. Those topics are listed in the following. (1) Time series analysis and modeling of Very Large Array (VLA) phase data. (2) Image analysis, feature extraction and various applied enhancement methods for industrial NDE X-ray radiographic images. (3) Enhancing NDE radiographic X-ray images by adaptive regional ...