This study demonstrates the theoretical operation of an all-optical silica fiber isolator using stimulated Brillouin scattering. Two pump sources that copropagate through a double-mode generate acoustic waves electrostriction. These then induce unidirectional interband optical transitions between separate pair signal sources. With 1 W total input power, complete isolation is achieved with rod waveguide radius 0.67 μm over length approximately 12 m, pumps operating at wavelength 1.55 and...

Light field (LF) imaging enables new possibilities for digital imaging, such as refocusing, changing of focus plane, viewpoint, scene-depth estimation, and 3D scene reconstruction, by capturing both spatial angular information light rays. However, one main problem in dealing with LF data is its sheer volume. In this context, efficient compression methods are needed a particular type content. paper, we propose content-based image-compression method Gaussian process regression to improve the...

The ever-increasing power of computers and the development new optimization methodologies have enabled ability to design complex aperiodic devices, which can outperform periodic ones offer functionalities. Here, we describe realization an ultracompact grating coupler capable selectively launching surface plasmon polaritons (SPPs) in a desired direction. We use transfer matrix model facilitate rapid such structures. demonstrate both numerically experimentally that structure consisting five...

Evaluation of light field image (LFI), especially micro-lens camera (LF), is a new and challenging work. The development quality assessment (IQA) metric LFIs relies on the subjective database. In this paper, we establish perceptual dataset consisting 240 distorted images from 8 source with five distortion types. Furthermore, no-reference IQA proposed by combining 2D 3D characteristics LFI Support Vector Regression (SVR) model. performance demonstrated comparing some classical full reference...

The large amount of complex scene information recorded by light field imaging has the potential for immersive media applications. Compression and reconstruction algorithms are crucial transmission, storage, display such massive data. Most existing quality evaluation indexes do not effectively account characteristics. To accurately evaluate distortions caused compression algorithms, it is necessary to construct an image index that reflects angular-spatial characteristics field. This work...

The quality evaluation is an indispensable link in light field (LF) image processing. Most of existing LF objective indexes do not make effective use the angular characteristic LF, so results are unsatisfactory. In this letter, constructed based on human visual system (HVS) and angular-spatial characteristics. Based fact that HVS has different sensitivity to parallaxes, we assume perceived by eyes optimal parallax range. A dual-fan filter used constrain Then, overall represented combining...

Mulberry bacterial blight (MBB) is a complex and one of the devastating diseases mulberry that causes serious reduction in yield quality mulberry. In recent years, transformation sericulture industry, production system, increasing seedling trade have resulted spread MBB to different parts China, posing major economic threat farmers industry. This study investigated occurrence eight provinces China during years 2023 2024. The disease samples were collected composition pathogenic microbiome...

ABSTRACT Human mesh reconstruction from point clouds has gained increasing attention in recent years. However, existing pipelines predominantly focus on regressing human model parameters, which results an indirect mapping between input observations and output meshes. In this letter, we introduce a point‐to‐vertex method, bypasses parameter spaces to reconstruct complete SMPL topology partial directly. Specifically, our framework employs hierarchical approach extract geometric information the...

4D light field data record the scene from multiple views, thus implicitly providing beneficial depth cue for salient object detection in challenging scenes. Existing (LF SOD) methods usually use a large number of views to improve accuracy. However, using so many LF SOD brings difficulties its practical applications. Considering that adjacent are actually with very similar contents, this work, we propose defining more efficient pattern input i. e., key sparse and design network effectively...

Due to its spatio-angular structure, light field image allows for a wealth of post-processing techniques like digital refocusing and depth estimation. In order compress the data two domains, current proposal intends embed disparity-based view synthesis method into decoder. However, predicting each separately or in local groups means bringing more computational burden decoder destroying structure. Since disparity contains relationship between all rays field, proposed solution is predict...

Light field imaging can simultaneously record the position and direction information of light rays; thus, digital refocusing full depth-of-field extension — functions that are inaccessible for conventional images be achieved using structural consistency data. To meet challenges limited bandwidth storage, such vast numbers data must compressed to a low bitrate. However, current compression solutions ignore intrinsic fields in pursuit bitrate, thereby leading loss capabilities. solve this...

The geometry-based light field compression approach aims to use the inherent disparity cue provided by reduce redundancy of data and improve immersive media broadcasting. Some methods, including our previous one, transmit explicit maps along with sparsely selected views then exploit disparity-based view prediction remove correlations in angular domain. However, these methods neglect two important issues: 4D correspondence between array practical non-uniform distribution captured fields. As a...

Advanced handheld plenoptic cameras are being rapidly developed to capture information about light fields (LFs) from the 3D world.Rich LF data can be used develop dense sub-aperture images (SAIs) that provide a more immersive experience for users.Unlike conventional 2D images, 4D SAIs contain both positional and directional of rays; practical applications limited by huge volume required this information.Therefore, an efficient compression method is vital further application cameras.To end,...

In this paper, a low-complexity algorithm is proposed to reduce the complexity of depth map compression in high-efficiency video coding (HEVC)-based 3D (3D-HEVC). Since and corresponding texture represent same scene video, there high correlation among information from video. An experimental analysis performed study such as motion vector prediction mode. Based on correlation, we propose three efficient approaches, including early termination mode decision, adaptive search range estimation...