| http://www.w3.org/ns/prov#value | - to a region including a portion estimated to be a dark portion due to backlight on the basis of said average lightness and said average value of said average lightness, or a portion which is not the dark portion due to the backlight but is a portion estimated to be something other than the cloud and the sky on the basis of said rate of said sky pixel and said rate of said cloud pixel, and setting
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