Interferenceless incoherent digital holography with binary coded apertures optimized using direct binary search. (January 2023)

• Record Type: Journal Article
• Authors: Kumar, Manoj; Anand, Vijayakumar; Rosen, Joseph
• Is Part Of: Optics and lasers in engineering. Volume 160(2023)
• Publication Date: 2023-01
• Subjects: Digital holography -- Imaging systems -- Computer holography -- Coded aperture -- Diffraction and gratings; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2022.107306
• Languages: English
• ISSNs: 0143-8166

Abstract

Highlights: A novel hybrid computational algorithm that integrates the Gerchberg-Saxton algorithm and direct binary search algorithm has been developed to design binary coded masks that can yield a higher signal-to-noise ratio in coded aperture correlation holography systems. The obtained results showed that from the proposed DBSA to synthesize binary CPMs are capable of reconstructing 3D images with a higher SNR than the former used GSA. The new design approach expands coded aperture correlation holography methods to the electromagnetic regions of X-rays, Gamma rays and THz with simple binary masks without sacrificing the signal-to-noise ratio. Abstract: Coded aperture correlation holography offers 3D imaging with improved lateral and axial resolutions. This study is an additional advancement in the line of imaging systems with a pseudorandom coded aperture. Starting with the coded aperture correlation holography system implemented on an incoherent on-axis interferometer, we proposed interferenceless and lensless versions of the system. In the present study, we propose replacing the multi-values phase aperture mask with a binary mask. Two binary masks synthesized iteratively are used in two camera shots. Each mask is obtained from an iterative optimization process known as direct binary search, where the optimized cost function is the peak-to-background ratio of a reconstructed point object. Overall, the system demonstrates a lower background noise compared to other methods, enabling 3D imaging capability with only two camera shots, a substantial improvement in comparison to the many shots in the original systems. Using binary masks might extend the usefulness of the coded aperture holography for new regions in the electromagnetic spectrum other than the visual band, as of X-ray and THz bands.