| http://www.w3.org/ns/prov#value | - frame number such as 1, 2, 3, . . . n, a second frame signal of said second image signal is denoted by Sn, and said step of combining said expanded first and second image signals includes the steps of, in turn, combining Ln???1 and Sn???1, combining Sn???1 and Ln, and combining Ln and Sn on the basis of said identification signals, and sequentially outputting combined signals.
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