| http://www.w3.org/ns/prov#value | - The image signal, which represents the face image shown in FIG. 20A, is subtracted from the new two-dimensional image signal S0, which represents the face image shown in FIG. 19C. From the subtraction, as illustrated in FIG. 20B, the new corrected two-dimensional image signal S0???, which represents the face image formed with only the light radiated out from the light source other than the light s
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