Physics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7611404s&link_type=abstract
Unknown
Physics
Digital Spacecraft Television, Images, Lunar Exploration, Mariner Program, Space Exploration, Histograms, Imaging Techniques, Photographs, Spaceborne Photography, Television Equipment, Vidicons
Scientific paper
Planetary imaging from unmanned spacecraft, almost exclusively done by digital systems, is examined. The Mars Mariner 9 television camera, representative of such systems, is considered. Each image consists of 700 lines, each containing 832 picture elements, or pixels. Each pixel contains nine binary bits of information capable of displaying 512 discrete brightness levels. Several problems inherent in television systems are discussed. These include nonuniform target response, residual images, noise, and blemishes. These defects can be removed to some extent by decalibration of the image. The final product is geometrically corrected for camera distortion and photometrically corrected. Several versions of the decalibrated images are available. The most generally useful are the geometrically corrected images with enhanced contrast. The Mariner 10 imaging of Mercury is briefly discussed.
Jones Kenneth L.
Mutch Thomas A.
Saunders Stephen R.
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