Cosinusoidal encoding multiplexed structured illumination multispectral ghost imaging

Area of Science:

• Optics and Photonics
• Computational Imaging
• Information Science

Background:

• Multispectral ghost imaging offers richer information than single-band methods but often suffers from complex setups and long reconstruction times.
• Existing systems present limitations in terms of structural complexity and computational efficiency for acquiring detailed spectral data.

Purpose of the Study:

• To propose a novel cosinusoidal encoding multiplexed structured illumination multispectral ghost imaging approach.
• To overcome the limitations of existing systems by enhancing imaging efficiency and reducing reconstruction time.
• To enable high-dimensional information acquisition with a simplified and faster ghost imaging technique.

Main Methods:

• A cosinusoidal encoding strategy is developed, fusing specific frequency characteristics with orthogonal Hadamard basis patterns for multiplexed structured illumination.
• A single-pixel detector and broadband photomultiplier collect backscattered signals from the target object.
• The multispectral image is reconstructed using Fourier transform on the mixed grayscale image, leveraging the frequency distribution of the encoding matrices.

Main Results:

• The proposed method successfully captures multispectral images within a single projection cycle.
• High imaging efficiency and low time consumption were achieved, addressing key limitations of prior systems.
• Numerical simulations and experimental results validated the effectiveness of the cosinusoidal encoding approach for accurate reconstruction.

Conclusions:

• The cosinusoidal encoding multiplexed structured illumination offers an efficient and simplified method for multispectral ghost imaging.
• This technique significantly reduces reconstruction time and system complexity.
• The approach has potential applications in other high-dimensional information acquisition fields, including high-resolution and polarization ghost imaging.