Compressive holography with resolution improvement and lensless adjustable magnification
| Autor: | J.C.S. de Souza, P. A. M. dos Santos, R. B. R. Freire |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Computer science
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Holography Physics::Optics Magnification 02 engineering and technology Iterative reconstruction 01 natural sciences law.invention 010309 optics Speckle pattern Optics law 0103 physical sciences Angular resolution Electrical and Electronic Engineering Physical and Theoretical Chemistry Pixel business.industry Filter (signal processing) 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Compressed sensing 0210 nano-technology business Digital holography |
| Zdroj: | Optics Communications. 437:337-341 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2018.12.081 |
| Popis: | In lensless digital holography the resolving power is limited by factors such as the finite size of recorded area, pixel dimensions and sampling rate of digital acquisition system. These factors acts as a filter that discards high-frequency components with useful information about the analyzed object. In the present work, we propose a method to overcome these limitations to proving the resolution recovery in digital in-line holography by utilizing adjustable magnification in a compressive sensing framework. Here, we model the sensed field as low-pass filtered and projected on a Fresnel base with adjustable magnification and use sparse regularization in an inverse problem approach to image reconstruction. Our method enhances image reconstruction resolution from a single recorded hologram with magnification independent of parameters such as propagation distance and wavelength of light, which enables to be used in applications like multi-wavelength digital holography. In addition, this technique offers high noise immunity and eliminates typical problems of holographically reconstructed images such as twin image and speckle. Therefore, we demonstrate by simulations and experimentally results that our approach significantly improves the quality of reconstructed images when compared with conventional techniques. |
| Databáze: | OpenAIRE |
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