Questions of contrast on the surface of Venus

Details Questions of contrast on the surface of Venus Questions of contrast on the surface of Venus

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975kosis..13..612p&link_type=abstract

Kosmicheskie Issledovaniia, vol. 13, July-Aug. 1975, p. 612-614. In Russian.

Physics

Image Contrast, Photomapping, Planetary Mapping, Planetary Surfaces, Venus (Planet), Luminous Intensity, Optical Scanners, Spaceborne Photography

Scientific paper

Surface contrast of an object to be mapped is dependent on its brightness distribution, which is in turn a function of its light intensity. Contrast in a given area is expressed as the difference between its maximum light intensity and the ratio of its minimum to maximum intensities. Calculations show that under natural light and with an angle of inclination less than 15 from the plane of a given area its degree of contrast is unaffected by mutual illumination from nearby areas. An analysis of contrast on the light of Venus at varying angles of inclination and under different ratios Q of natural to artificial light is presented. It is shown that with data on the contrast sensitivity of the scanning system it is possible to determine the necessary Q. From this may be found the amount of artificial light that must be provided for good contrast, avoiding energy waste.

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