Color decorrelation for the PHOBOS mission camera experiment

Details Color decorrelation for the PHOBOS mission camera experiment Color decorrelation for the PHOBOS mission camera experiment

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..297h&link_type=abstract

(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (

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Deimos, Imaging Spectrometers, Multispectral Band Cameras, Phobos, Satellite Surfaces, Satellite-Borne Photography, Cameras, Satellite Observation, Mars, Satellites, Phobos 2 Mission, Vsk Instrument, Spectra, Morphology, Surface, Brightness, Color, Optical Properties, Image Processing, Crater Rims, Grain Size, Phobos, Procedure, Craters, Ejecta, Imagery, Chemistry, Radiometry, Geometry, Topography, Physical Properties

Scientific paper

The surface characteristics of Phobos are reexamined based on new images provided by the VSK-Fregat camera experiment together with modern processing techniques for color analysis. The VSK-Fregat camera provided a quasi-simultaneous recording of panchromatic high resolution images together with lower resolution two-channel spectral images. Contrast enhancement, geometrical coregistration, band ratioing, principal component analysis, and HSI-color transformations were all performed during image processing. It is concluded that at low phase angles the crater rims appear brighter and redder than the surrounding material and that a slightly reddish patch was discovered that cannot be explained simply by topographic or illumination effects. It is also concluded, however, that the bright crater rims and the slightly reddish surface patch cannot be attributed merely to detector noise or similar effects. Similar observations were made by other research teams and it is hypothesized that a decrease in particle size may be responsible for the reddish appearance in these areas.

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