Full image reconstruction with reduced speckle noise, from a partially illuminated Fresnel hologram, using a structured random phase

Cruz, María-Luisa

doi:10.1364/ao.58.001917

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…Nagahama introduced a zero-phase method that computed DOEs using virtual converging waves, leading to a substantial reduction in noise within the reconstructions [45] . Mengu and Cruz opted for structured phases instead of random phases to design DOEs, achieving high-quality reconstructions in the process [46,47] . Nevertheless, it is important to note that when it comes to random-phase-based optimization, the generalization capacity of certain strategies may not be particularly robust, and the improvements for specific targets may not be as pronounced.…”

Section: Complex Modulation By Micro-diffractive Optical Elementsmentioning

confidence: 99%

Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Zhang,

He,

Xie

et al. 2023

Photonics Insights

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Diffractive optical elements (DOEs) are intricately designed devices with the purpose of manipulating light fields by precisely modifying their wavefronts. The concept of DOEs has its origins dating back to 1948 when D. Gabor first introduced holography. Subsequently, researchers introduced binary optical elements (BOEs), including computer-generated holograms (CGHs), as a distinct category within the realm of DOEs. This was the first revolution in optical devices. The next major breakthrough in light field manipulation occurred during the early 21st century, marked by the advent of metamaterials and metasurfaces. Metasurfaces are particularly appealing due to their ultra-thin, ultra-compact properties and their capacity to exert precise control over virtually every aspect of light fields, including amplitude, phase, polarization, wavelength/frequency, angular momentum, etc. The advancement of light field manipulation with micro/nano-structures has also enabled various applications in fields such as information acquisition, transmission, storage, processing, and display. In this review, we cover the fundamental science, cuttingedge technologies, and wide-ranging applications associated with micro/nano-scale optical devices for regulating light fields. We also delve into the prevailing challenges in the pursuit of developing viable technology for real-world applications. Furthermore, we offer insights into potential future research trends and directions within the realm of light field manipulation.

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Section: Complex Modulation By Micro-diffractive Optical Elementsmentioning

confidence: 99%

Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Zhang,

He,

Xie

et al. 2023

Photonics Insights

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“…The noise was created by multiplying random value concerning pixel value and illustrated by using formula (3.1) mentioned below. Speckle noise observed in a radar system, even though it might show up in a remotely detected picture using lucid radiation [18]. Fig 3.4 illustrates the induction of speckle-noise over bacteria leaf blight and healthy leaves.…”

Section: Speckle Noisementioning

confidence: 99%

Noise Deduction in Novel Paddy Data Repository using Filtering Techniques

Malathi

2020

SCPE

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Classification of paddy crop diseases in prior knowledge is the current challenging task to evolve the economicgrowth of the country. In image processing techniques, the initial process is to eliminate the noise present in the dataset. Removing the noise leads to improvements in the quality of the image. Noise can be removed by applying filtering techniques. In this paper, a novel data repository created from different paddy areas in Vellore, which includes the following diseases, namely Bacteria Leaf Blight, Blast, Leaf Spot, Leaf Holder, Hispa and Healthy leaves. In the initial process, three kinds of noises, namely Salt and Pepper noise, Speckle noise, and Poisson noises, were removed using noise filtering techniques, namely Median and Wiener filter. Theinterpretation made over the median and Wiener filtering techniques concerning noises, the performance of the methods measured using metrics namely PSNR (peak to signal to noise ration), MSE (mean square error), Maxerr (Maximum squared error), L2rat (ratio of squared error). It is observed that the PSNR value of the hybrid approach is 18.42dB, which produces less error rate as compared with the traditional approach. Results suggest that the methods used in this paper are suitable for processing noise.

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“…Reconstructed image of a PPOH is not contaminated with random noise as in the case of the noise addition method, but is imposed with a blocky appearance. Similar approaches with enhancement on the quality of the reconstructed images have been attempted in [22]. Another method to simulate the effect of a diffuser is through down-sampling the intensity component of the object prior to generating the hologram.…”

Section: Introductionmentioning

confidence: 96%

Enhancing the Quality of Sampled Phase-Only Hologram (SPOH) Based on Time-Division Comb Filtering

et al. 2020

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Generation of digital phase-only Fresnel holograms is an important research area in digital holography, as it leads to a substantial simplification of a holographic display system. However, the quality of the reconstructed image of a hologram without the magnitude component is heavily degraded. The problem can be reduced by down-sampling the intensity of an image prior to generating the hologram. The method, referred to as "sampled phase-only hologram" (SPOH) generation, results in reconstructed images that are masked with the pattern of the down-sampling lattice. This paper reports a novel, low complexity method to alleviate this problem through the concept of comb filtering. Results reveal prominent enhancement on the reconstructed image of a SPOH.

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Full image reconstruction with reduced speckle noise, from a partially illuminated Fresnel hologram, using a structured random phase

Cited by 9 publications

References 20 publications

Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Diffractive optical elements 75 years on: from micro-optics to metasurfaces

Noise Deduction in Novel Paddy Data Repository using Filtering Techniques

Enhancing the Quality of Sampled Phase-Only Hologram (SPOH) Based on Time-Division Comb Filtering

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