Shifting colored coded aperture design for spectral imaging.

Area of Science:

• Optics
• Computational Imaging
• Spectroscopy

Background:

• Compressive spectral imaging (CSI) systems acquire 3D spatio-spectral data using 2D projections.
• Traditional CSI employs coded apertures for data cube modulation, often using photomasks on piezoelectric devices.
• A recent advancement involves "colored" coded apertures (patterned optical filter arrays) for spatial and spectral modulation.

Purpose of the Study:

• To propose a shifting colored coded aperture optimization for improved CSI reconstruction quality.
• To develop a cost-effective and less complex optical implementation for CSI systems.
• To enable CSI data acquisition with a limited number of filters and a single mask.

Main Methods:

• Development of a mathematical model for the computational imaging strategy.
• Implementation of a shifting colored coded aperture design.
• Validation through simulations and experimental testbed results.

Main Results:

• The proposed shifting colored coded aperture design enhances imaging quality reconstruction.
• Achieved a practical optical implementation with a reduced number of filters.
• Demonstrated the ability to acquire data with a single mask for any number of shots.

Conclusions:

• The shifting colored coded aperture optimization effectively overcomes practical limitations in current CSI systems.
• The proposed design offers superior accuracy and performance compared to existing literature.
• This advancement facilitates more accessible and efficient spatio-spectral data cube acquisition.