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Image restoration using the point spread function of the Halley Multicolour Camera
Author(s) -
Kramm J. R.,
Möhring W.,
Keller H. U.
Publication year - 1987
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl014i007p00677
Subject(s) - subpixel rendering , point spread function , optics , physics , point (geometry) , remote sensing , aperture (computer memory) , spacecraft , computer science , computer vision , artificial intelligence , geology , astronomy , mathematics , pixel , acoustics , geometry
The optical resolution of the Halley Multicolour Camera (HMC) is limited by its finite aperture, by minute mechanical degradations within the instrument, and by the high speed time delay and integration (TDI) illumination method adapted to the spin of the spacecraft. The sum of all implies a visible loss of image sharpness. The smearing effect has been calibrated using images of a star which can be considered as a point source. The images were superimposed in the frequency domain with subpixel accuracy. With these means the point spread function (PSF) has been determined and applied to the received images using Fourier methods. The effectiveness of the scheme is demonstrated on images of the earth and comet Halley.