Single shot multispectral multidimensional imaging using chaotic waves

Abstract

Multispectral imaging technology is a valuable scientific tool for various applications in astronomy, remote sensing, molecular fingerprinting, and fluorescence imaging. In this study, we demonstrate a single camera shot, lensless, interferenceless, motionless, non-scanning, space, spectrum, and time resolved five-dimensional incoherent imaging technique using tailored chaotic waves with quasi-random intensity and phase distributions. Chaotic waves can distinctly encode spatial and spectral information of an object in single self-interference intensity distribution. In this study, a tailored chaotic wave with a nearly pure phase function and lowest correlation noise is generated using a quasi-random array of pinholes. A unique sequence of signal processing techniques is applied to extract all possible spatial and spectral channels with the least entropy. The depth-wavelength reciprocity is exploited to see colour from depth and depth from colour and the physics of beam propagation is exploited to see at one depth by calibrating at another.

Enhanced Reconstruction of Spatially Incoherent Digital Holograms Using Synthetic Point Spread Holograms

“…In the CAI experiment, a PSF was recorded (Figure 2f) by modulating the light diffracted from a point object by a mask consisting of a random array of pinholes. In the next step, a spark was generated and recorded, as shown in Figure 2g [2,14,15]. The recorded intensity distribution was processed with the PSF, and the reconstructed image is shown in Figure 2h.…”

“…The coded aperture imaging (CAI) technique is a widely used computational optical method that has efficiently replaced the need for high-quality optical components in direct lens-based imagers with computational methods [1,2]. In direct imaging methods, the image of an object is directly formed on the image sensor.…”

Lensless Three-Dimensional Quantitative Phase Imaging Using Phase Retrieval Algorithm

“…In this case, an error function defined by a cross-correlation between the original phase pattern and the reconstructed phase pattern is used for quantifying the similarity between the two. The correlation function is defined as , where is the phase pattern reconstructed from the phase retrieval algorithm after p iterations and ‘ ’ is a 2D correlation operator [ 33 , 34 ] with a phase-only filter [ 35 ]. Once C ( x = 0, y = 0) reaches a stable value, the iteration is stopped.…”

“…is the phase pattern reconstructed from the phase retrieval algorithm after p iterations and ' * ' is a 2D correlation operator [33,34] with a phase-only filter [35]. Once C (x = 0, y = 0) reaches a stable value, the iteration is stopped.…”

Polarized hyperspectral imaging with single fiber bundle via incoherent light transmission matrix approach

“…To recover the hyperspectral information for objects under incoherent illumination, some techniques have been proposed recently with the use of the coded aperture [29], multiple scattering materials [30,31], or the spectral filter array [32]. Those methods encode the speckle of the scattered object and recover the hyperspectral information through PSFs' library [33]. However, those techniques still rely on conventional dispersion and elements such as spectral filters or prisms.…”