This paper reports the implementation of an optical fiber sensor to measure refractive index in aqueous media based on localized surface plasmon resonance (LSPR). We have used a novel technique known as photodeposition immobilize silver nanoparticles end. has simple instrumentation, involves laser light via and suspended medium. The was assembled using tungsten lamp white light, spectrometer, with nanoparticles. response this is such that LSPR peak wavelength linearly shifted longer...

The generation and manipulation of microbubbles by means temperature gradients induced low power laser radiation is presented. A beam (λ = 1064 nm) divided into two equal parts coupled to multimode optical fibers. opposite ends each fiber are aligned separated a distance D within an ethanol solution. Previously, silver nanoparticles were photo deposited on the fibers ends. Light absorption at produces thermal gradient capable generating microbubble end in non-absorbent liquids. theoretical...

A high-precision and fast algorithm for computation of Jacobi-Fourier moments (JFMs) is presented. recursive method developed the radial polynomials that occur in kernel function JFMs. The proposed numerically stable very comparison with conventional direct method. Moreover, suitable JFMs highest orders. are generic expressions to generate orthogonal changing parameters α β Jacobi polynomials. quality description known studied. Also, a search performed best parameters, β, which significantly...

The most common approach to optically generate and manipulate bubbles in liquids involves temperature gradients induced by CW lasers. In this work, we present a method accomplish both the generation of microbubbles their 3D manipulation ethanol through optothermal forces. These forces are triggered light absorption from nanosecond pulsed laser (λ = 532 nm) at silver nanoparticles photodeposited distal end multimode optical fiber. Light absorbed each pulse quickly heats up silver-ethanol...

Digital holographic microscopy (DHM) is an effective technique for quantitative phase imaging (QPI) of microscopic samples, yet its accuracy hinges on precise compensation wavefront aberrations. Conventional methods often rely iterative, time-intensive procedures or additional optical elements, making it difficult to rapidly and accurately generate fully compensated maps. This work introduces a numerical vortex as efficient method automatically correcting the tilt aberration introduced in...

Digital holographic microscopy (DHM) is an effective technique for quantitative phase imaging (QPI) of microscopic samples, yet its accuracy hinges on precise compensation wavefront aberrations. Conventional methods often rely iterative, time-intensive procedures or additional optical elements, making it difficult to rapidly and accurately generate fully compensated maps. This work introduces a numerical vortex as efficient method automatically correcting the tilt aberration introduced in...

An optical-digital imaging system that uses some Jacobi-Fourier profile functions for encoding and a convolutional neural network (CNN) digital decoding is proposed. A blind deconvolution trained on generated encoded image datasets with defocus aberration added to the in-focus point spread function (PSF) corresponding each phase mask (PM). Image done using PSF belongs classic cubic PM family of PMs based polynomials (JFP), radial order p= 7, 9, 10. Our simulated experimental results show...

Digital holographic microscopy (DHM) is an effective technique for quantitative phase imaging (QPI) of microscopic samples, yet its accuracy hinges on precise compensation wavefront aberrations. Conventional methods often rely iterative, time-intensive procedures or additional optical elements, making it difficult to rapidly and accurately generate fully compensated maps. This work introduces a numerical vortex as efficient method automatically correcting the tilt aberration introduced in...

A detailed analysis of the quaternion generic Jacobi-Fourier moments (QGJFMs) for color image description is presented. In order to reach numerical stability, a recursive approach used during computation Jacobi radial polynomials. Moreover, search criterion performed establish best values parameters [Formula: see text] and polynomial families. Additionally, polar pixel taken into account increase accuracy in calculation QGJFMs. To prove mathematical theory, some images from optical...

In this work we propose Jacobi–Fourier phase masks for wavefront coding-based imaging systems. The optical properties of the mask is study in detail and numerical simulation are shown. Pixel size noise taken into account deconvolution images. Numerical simulations indicate that overall performance better than well-known commonly used trefoil phase.

Color image reconstruction provides a measure of the feature representation capability moment functions. In this work, we present quaternion Fourier-Legendre moments in polar pixels, which are computationally faster and have high-precision compared with other methods. addition, to improve performance array use an inherent property Legendre polynomials for accurate calculation kernel integration. Moreover, presented new set is families proposed, such as Zernike moments, pseudo-Zernike...

An experimental and theoretical study on the 3D trapping manipulation of microbubbles by means low power laser-induced temperature gradients induced in ethanol bulk light absorption (λ = 1550 nm) is presented. Two optical fibers were used: One for bubble generation (OFG) other both (OFT). Light from a Q-switched pulsed laser (λ=532 nm & pulse width τp=5 ns) propagates fiber OFG gets absorbed at silver nanoparticles (AgNPs), previously photodeposed, distal end optic core, generating...

It is well known that, a piecewise function can be expanded by an orthogonal set of functions. If the expansion coeficients are suitable for large number terms, reconstruction achieved with high accuracy. However, few them input function, in general, poor. In this work, we reconstruct discrete image functions using complex Zernike polynomials. We compare two cases. When mapped inside or outside unit circle several orders. To measure use relative error between and reconstructed images. Also,...

When strong Jaundice is presented, babies or adults should be subject to clinical exam like "serum bilirubin" which can cause traumas in patients. Often jaundice presented liver disease such as hepatitis cancer. In order avoid additional we propose detect (icterus) newborns by using a not pain method. By acquiring digital images color, palm, soles and forehead, analyze RGB attributes diffuse reflectance spectra the parameter characterize patients with either not, correlate that parameters...

In studies of scalar diffraction theory and experimental practice, the basic geometric shape a circle is widely used as an aperture. Its Fraunhofer pattern has simple mathematical expression easily determined by use Fourier-Bessel transform. However, it may require considerable effort to determine far-field patterns aperture shapes related circular geometry. From computational point view, difficulties posed other geometries well more-general apertures with irregular can be surpassed means...

The modulus of the gradient color planes (MGC) is implemented to transform multichannel information a grayscale image. This digital technique used in two applications: (a) focus measurements during autofocusing (AF) process and (b) extending depth field (EDoF) by means multifocus image fusion. In first case, MGC procedure based on an edge detection over 15 metrics that are typically handled microscopy. approach tested images histological sections for selection in-focus images. An appealing...

Several water index-based methods have been proposed in the literature, which, combine satellite multispectral bands an algebraic expression. The objective of these is to increase intensity contrast between water-pixels (surface water-body) and non-water pixels (built-up, soil, vegetation, etc.). present investigation evaluates Modified Normalized Difference Water Index (MNDWI) Automated Extraction (AWEI) using Satellite data from Landsat 5 TM, 8 Sentinel 2A at different time scenes. Based...

We present a detailed analysis of the reconstruction gray-level images using orthogonal moments with respect to basis sets Zernike, Fourier-Mellin, Chebyshev-Fourier, and pseudo-Jacobi-Fourier polynomials. As test images, we use Ronchigrams different numbers fringes as high-spatial-frequency components. The evaluation image between moment is made in terms metrics. These measurements are normalized error, overall activity level each spatial frequency variations, root-mean-square contrast,...

Wavefront coding is a hybrid optical-computational technique that makes use of phase modulating element in conjunction with deconvolution algorithm to extend the depth focus imaging systems. The mask codes wave-front such way point-spread function do not change appreciably as defocus. In this work, modulation introduced by masks shape subset Jacobi-Fourier polynomials. We will show, both numerical simulations and experiments polynomial are good candidates for high-resolution images under...

We propose an invariant description method based on Zernike moments to classify hand vein patterns from raw infrared (IR) images. Orthogonal provide linearly independent descriptors and are affine transformations, such as translation, rotation, scaling. A mathematical expression is given derive a set of moment invariants. The obtained features have all the properties invariants with additional feature image contrast invariance. For dorsal pattern acquisition, IR imaging system implemented....

A machine vision system for fault detection in PET bottles is presented. The bottle inspector divided three modules image acquisition of finish, wall and bottom. captured images are corrected by adaptive gamma correction. An algorithm based the frequency filtering <i>n</i> defect finish proposed. We obtain a correct rate classification 85.5 % 80.64 95.0

Urban growth, deforestation, water resources and thawing of the poles due to globe worming are topics interest in research community. Normalize difference indices utilized remote sensing analyzed classify surface cover types. In this paper research, a multispectral satellite data from Landsat 5 TM is preprocessing, order addresses evaluates accuracy Normalized Built-up Index (NDBI), Difference Vegetation (NDVI), Automated Water Extraction (AWEI) Snow (NDSI) at different time scenes. A...

Vein patterns can be used for accessing, identifying, and authenticating purposes; which are more reliable than classical identification way. Furthermore, these venipuncture in health fields to get on veins of patients when they cannot seen with the naked eye. In this paper, an image acquisition system is implemented order acquire digital images people hands near infrared. The consists a CCD camera light source peak emission 880 nm. This radiation penetrate strongly absorbed by...