Deep Deconvolution of Object Information Modulated by a Refractive Lens Using Lucy-Richardson-Rosen Algorithm

Praveen, Periyasamy Angamuthu; Arockiaraj, Francis Gracy; Gopinath, Shivasubramanian; Smith, Daniel; Kahro, Tauno; Valdma, Sandhra-Mirella; Bleahu, Andrei; Ng, Soon Hock; Reddy, Andra Naresh Kumar; Katkus, Tomas; Rajeswary, Aravind Simon John Francis; Ganeev, R. A.; Pikker, Siim; Kukli, Kaupo; Tamm, Aile; Juodkazis, Saulius; Anand, Vijayakumar

doi:10.3390/photonics9090625

Cited by 28 publications

(26 citation statements)

References 32 publications

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“…In the case of symmetric PSFs, LRRA always perform better than NLR. Since, spatial aberration correction has already been shown in the case of a refractive lens in which LRRA performed better than NLR, we believe that the spatial and spectral aberrations associated with diffractive lens can be corrected with LRRA [42]. We believe these results can be implemented to manufacture portable, low-weight devices with higher resolution, such as telescopes, lensless cameras and microscopes.…”

Section: Discussionmentioning

confidence: 75%

“…In LRRA, the backward correlation (matched filter) is replaced by NLR which not only improved the estimation but enabled a rapid convergence. Different studies were carried out recently and it was found that LRRA performs better than LRA and NLR if the PSF is symmetric [42,43]. But NLR is capable of reconstructing object information convoluted with both symmetric as well as asymmetric PSFs.…”

Section: Methodsmentioning

confidence: 99%

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Implementation of Large Area Diffractive Lens Using Multiple Sub-Aperture Diffractive Lenses and Computational Reconstruction

Gopinath¹,

Praveen²,

Kahro³

et al. 2022

Preprint

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Direct imaging systems that create an image of an object directly on the sensor in a single step are prone to many constraints as a perfect image is required to be recorded within this step. In designing high resolution direct imaging systems with a diffractive lens, the outermost zone width either reaches the lithography limit or the diffraction limit itself imposing challenges in fabrication. However, if the imaging mode is switched to an indirect one consisting of multiple steps to complete imaging, then different possibilities open up. One such methods is the widely used indirect imaging method with Golay configuration telescopes. In this study, a Golay-like configuration has been adapted to realize a large area diffractive lens with three sub-aperture diffractive lenses. The sub-aperture diffractive lenses are not required to collect light and focus them to a single point as in a direct imaging system but to focus independently on different points within the sensor area. This approach of Large Area Diffractive lens with Integrated Sub-Apertures (LADISA) relaxes the fabrication constraints and allows the sub-aperture diffractive elements to have a larger outermost zone width and smaller area. The diffractive sub-apertures were manufactured using photolithography. The fabricated diffractive element has been implemented in indirect imaging mode using non-linear reconstruction and Lucy-Richardson-Rosen algorithm with synthesized point spread functions. The computational optical experiments revealed an improved optical and computational imaging resolutions compared to previous studies.

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Section: Discussionmentioning

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Implementation of Large Area Diffractive Lens Using Multiple Sub-Aperture Diffractive Lenses and Computational Reconstruction

Gopinath¹,

Praveen²,

Kahro³

et al. 2022

Preprint

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“…In the case of the second sample, additional information related to the phase variation in the transparent region of the insect wings was visible and in the third sample digital phase refocusing can be observed. Some recent studies indicated the possibilities of employing a single refractive lens without two beam interference for 3D imaging with a single camera shot [21]. We believe that the proposed method is even better as it is lensless, interferenceless and has potential to image 3D phase information.…”

Section: Discussionmentioning

confidence: 91%

Single Shot Lensless Interferenceless Phase Imaging of Biochemical Samples Using Synchrotron Near Infrared Beam

Han¹,

Smith²,

Ng³

et al. 2022

Preprint

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Phase imaging of biochemical samples has been demonstrated for the first time at the Infrared Microspectroscopy (IRM) beamline of the Australian Synchrotron using the usually discarded Near-IR (NIR) region of the synchrotron-IR beam. The synchrotron-IR beam at the Australian Synchrotron IRM beamline has a unique fork shaped intensity distribution as a result of the gold coated extraction mirror shape, which includes a central slit for rejection of the intense X-ray beam. The resulting beam configuration makes any imaging task challenging. For intensity imaging, the fork shaped beam is usually tightly focused to a point on the sample plane followed by a pixel-by-pixel scanning approach to record the image. In this study, a pinhole was aligned with one of the lobes of the fork shaped beam and the Airy diffraction pattern was used to illuminate biochemical samples. The diffracted light from the samples was captured using a NIR sensitive lensless camera. A rapid phase-retrieval algorithm was applied to the recorded intensity distributions to reconstruct the phase information corresponding to different planes. The preliminary results are promising to develop multimodal imaging capabilities at the IRM beamline of the Australian Synchrotron.

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“…The quality of the results is affected by the low spatial coherence. Some recent studies indicated the possibilities of employing a single refractive lens without two beam interference for 3D imaging with a single camera shot [ 21 ]. We believe that the proposed method is even better as it is lensless, interferenceless and has potential to image 3D phase information.…”

Section: Discussionmentioning

confidence: 99%

Single Shot Lensless Interferenceless Phase Imaging of Biochemical Samples Using Synchrotron near Infrared Beam

Han

Smith

et al. 2022

Biosensors

Self Cite

View full text Add to dashboard Cite

Phase imaging of biochemical samples has been demonstrated for the first time at the Infrared Microspectroscopy (IRM) beamline of the Australian Synchrotron using the usually discarded near-IR (NIR) region of the synchrotron-IR beam. The synchrotron-IR beam at the Australian Synchrotron IRM beamline has a unique fork shaped intensity distribution as a result of the gold coated extraction mirror shape, which includes a central slit for rejection of the intense X-ray beam. The resulting beam configuration makes any imaging task challenging. For intensity imaging, the fork shaped beam is usually tightly focused to a point on the sample plane followed by a pixel-by-pixel scanning approach to record the image. In this study, a pinhole was aligned with one of the lobes of the fork shaped beam and the Airy diffraction pattern was used to illuminate biochemical samples. The diffracted light from the samples was captured using a NIR sensitive lensless camera. A rapid phase-retrieval algorithm was applied to the recorded intensity distributions to reconstruct the phase information. The preliminary results are promising to develop multimodal imaging capabilities at the IRM beamline of the Australian Synchrotron.

show abstract

Deep Deconvolution of Object Information Modulated by a Refractive Lens Using Lucy-Richardson-Rosen Algorithm

Cited by 28 publications

References 32 publications

Implementation of Large Area Diffractive Lens Using Multiple Sub-Aperture Diffractive Lenses and Computational Reconstruction

Implementation of Large Area Diffractive Lens Using Multiple Sub-Aperture Diffractive Lenses and Computational Reconstruction

Single Shot Lensless Interferenceless Phase Imaging of Biochemical Samples Using Synchrotron Near Infrared Beam

Single Shot Lensless Interferenceless Phase Imaging of Biochemical Samples Using Synchrotron near Infrared Beam

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