| http://www.w3.org/ns/prov#value | - Thus, the photoelectric conversion element ID1, ID2 provided on the Fourier transform plane FL1, FL3 photoelectrically converts a light quantity obtained by integration of an overall spectrum of light passing through the region except for the region where the spatial filter S1, S2 is provided in the spatial frequency region Ff1, Ff2, shown in FIG. 3A, 3B, and then outputs an output IDD1, IDD2.
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