Theoretical And Experimental Automatic Exposure Control Study

R. Wakeman; M. Jackson

doi:10.1117/12.978130

1 May 1972 Theoretical And Experimental Automatic Exposure Control Study

R. Wakeman, M. Jackson

Proceedings Volume 0027, Remote Sensing of Earth Resources and the Environment; (1972) https://doi.org/10.1117/12.978130
Event: Remote Sensing of Earth Resources and the Environment, 1971, Palo Alto, United States

Abstract

A study of the statistics of selected aerial photographs was made to determine the usefulness of these quantities for the control of an Automatic Exposure system. The photos typify cloud-free, heavy haze conditions; cloud-free, clear conditions; and scattered-cloud, haze-free conditions. The photographs were converted to digital tape records, using the FAIRSCAN image analyzer, a system for scanning and digitizing imagery. The tapes were then fed to an appropriately programmed computer and five statistics were derived for each photo. The first two statistics, the "mean" and the "standard deviation", proved to contain the necessary information. Higher order moments and the statistics derived from them appeared inconsistent and uninformative, at least for the small sample of three photos. In addition, it was determined that about one thousand elements per picture was adequate to determine the statistics and that the values obtained were insensitive to the elemental aspect ratio for ratios up to about 4:1.

Citation Download Citation

R. Wakeman and M. Jackson "Theoretical And Experimental Automatic Exposure Control Study", Proc. SPIE 0027, Remote Sensing of Earth Resources and the Environment, (1 May 1972); https://doi.org/10.1117/12.978130

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