Fig. 2: Illustration of four CASSI architectures. | Light: Science & Applications

Fig. 2: Illustration of four CASSI architectures.

From: Spectral imaging with deep learning

Fig. 2: Illustration of four CASSI architectures.

In DD-CASSI architecture, the spectral scene experiences a shearing-coding-unshearing procedure. In SD-CASSI, the diffraction grating before the coded aperture is removed, therefore it becomes a coding-shearing process. In SCCSI, the coded aperture is placed behind the dispersive element and the spectral data will experience a shearing-coding procedure. In SS-CASSI, coded aperture position becomes flexible between spectral plane and camera sensor, where the ratio (d1 + d2)/d2 determines the extent of spectral encoding

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