Fig. 2.
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Post-processing flow of the sideband extraction process using two spectral channels. One channel has the pinhole blocked, while it is transparent for the other channel. The focal-plane images are Fourier-transformed to make the OTFs. Both contain the central OTF, while only one contains the sidebands. Subtracting the OTF of channel 1 from that of channel 2 reveals the sidebands. The OTF of the pinhole itself has also been subtracted to highlight the sidebands. The actual sensing process does not remove the pinhole OTF.
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