OPTICALLY DIVERSE CODED APERTURE IMAGING

摘要

Optically diverse coded aperture imaging (CAI) comprises imaging a scene which is multi-spectrally diverse or polarimetrically diverse. A CAI system (10) allows light rays (12) from a scene to pass to a detector array (14) through a coded aperture mask (16) within an optical stop (18). The mask 16 has multiple apertures 16a, and produces overlapping coded images of the scene on the detector array (14). Detector array pixels receive and sum intensity contributions from each coded image. The detector array (14) provides output data for processing to reconstruct an image. The mask (16) provides for multi- spectral information to become encoded in the data. A linear integral equation incorporating explicit wavelength dependence relates the imaged scene to the data. This equation is solved by Landweber iteration to derive a multi-spectral image. An image with multiple polarisation states (polarimetric diversity) may be derived similarly with a linear integral equation incorporating explicit polarisation dependence.