The purpose of this paper is to represent figure/ground perception of changing scenary image of landscape between daytime and nighttime, using image processing. First we investigate the colors of mountains, sky and buildings on photographs, comparing daytime and nighttime. Next we make gestalt images from the photographs, and concider the relation between the pictures and the elements (mountains, sky and buildings). Then we can see each changing scenary at daytime, twilight and nighttime devided figure/ground by deviding mountains, sky and town area.
