Context De-Confounded Emotion Recognition

2022 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), Год журнала: 2023, Номер 113, С. 19005 - 19015

Опубликована: Июнь 1, 2023

Context-Aware Emotion Recognition (CAER) is a crucial and challenging task that aims to perceive the emotional states of target person with contextual information. Recent approaches invariably focus on designing sophisticated architectures or mechanisms extract seemingly meaningful representations from subjects contexts. However, long-overlooked issue context bias in existing datasets leads significantly unbalanced distribution among different scenarios. Concretely, harmful confounder misleads models learn spurious correlations based conventional likelihood estimation, limiting models' performance. To tackle issue, this paper provides causality-based perspective disentangle impact such bias, formulate causalities variables CAER via tailored causal graph. Then, we propose Contextual Causal Intervention Module (CCIM) backdoor adjustment de-confound exploit true effect for model training. CCIM plug-in model-agnostic, which improves diverse state-of-the-art by considerable margins. Extensive experiments three benchmark demonstrate effectiveness our significance insight.

Язык: Английский

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Review for Micro‐Nano Processing Technology of Microstructures and Metadevices

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

Abstract As a popular artificial composite material emerging in recent years, metasurfaces are one of the most likely devices to break through volume limitation conventional optical components due their compact structure, flexible materials, and high modulation resolution beam. With unique arrangement units or made special metasurface can effectively modulate incident light's amplitude, phase, polarization, frequency, thus realizing applications such as communication, imaging, sensing, beam steering. The interaction high‐resolution periodic arrangement, constituent materials makes it possible realize these applications, so researchers should choose appropriate micro‐nano processing technologies when designing preparing metasurface. This review will present related preparation metasurfaces, electron lithography (EBL), femtosecond laser processing, focused ion (FIB), additive manufacturing, nanoimprinting, self‐assembly, respectively. In addition, classical techniques wet lithography, plasma deep reactive etching (DRIE), photolithography be introduced. Their development history functions described detail, examples micro‐nano‐structures different branches presented, well some using techniques. this paper has produced several tables describing technologies, outlining resolution, advantages disadvantages, on. Hopefully, provide with options ideas for metasurfaces.

Язык: Английский

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Information-hiding cameras: Optical concealment of object information into ordinary images

Science Advances, Год журнала: 2024, Номер 10(24)

Опубликована: Июнь 12, 2024

We introduce an information-hiding camera integrated with electronic decoder that is jointly optimized through deep learning. This system uses a diffractive optical processor, which transforms and hides input images into ordinary-looking patterns deceive/mislead observers. transformation valid for infinitely many combinations of secret messages, transformed output passive light-matter interactions within the processor. By processing these patterns, network accurately reconstructs original information hidden deceptive output. demonstrated our approach by designing cameras operating under various lighting conditions noise levels, showing their robustness. further extended this framework to multispectral operation, allowing concealment decoding multiple at different wavelengths, performed simultaneously. The feasibility was also validated experimentally using terahertz radiation. encoder–electronic decoder-based codesign provides high speed energy efficient camera, offering powerful solution visual security.

Язык: Английский

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A bi-directional metamaterial perfect absorber based on gold grating and TiO2-InAs normal hexagonal pattern film

Solar Energy Materials and Solar Cells, Год журнала: 2024, Номер 281, С. 113330 - 113330

Опубликована: Ноя. 28, 2024

Язык: Английский

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Surface-patterned chalcogenide glasses with high-aspect-ratio microstructures for long-wave infrared metalenses

Opto-Electronic Science, Год журнала: 2024, Номер 3(10), С. 240017 - 240017

Опубликована: Янв. 1, 2024

Язык: Английский

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Metasurfaces and their intelligent advances

Materials & Design, Год журнала: 2023, Номер 237, С. 112610 - 112610

Опубликована: Дек. 28, 2023

Metasurfaces exhibit excellent performance in the regulation of optical field parameters, such as phase, amplitude, and polarization, by using nanounit structures. The characteristics metasurface miniaturization its combination with advanced semiconductor processes have attracted significant attention, their design applications become focus researchers recently. traditional metasurfaces often requires professional designers. Consequently, work has difficult time-consuming increase complexity design. introduction artificial intelligence (AI) resulted rapid development simplification. Furthermore, begun to play role hidden layers neural networks, intelligent properties are gradually being identified. Based on control mechanism, this paper reviews designs progress. Additionally, feasibility, necessity, broad prospects AI clarified.

Язык: Английский

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Noninvasive inset-integrated meta-atom for achieving single-layer metasurface simultaneously with coded microwave reflectivity and digitalized infrared emissivity

Nanophotonics, Год журнала: 2024, Номер 13(17), С. 3113 - 3122

Опубликована: Май 16, 2024

Abstract With the rapid improvement of equipment integration technology, multi-spectrum detectors are integrated into compact volumes and widely used for object detection. Confront with this challenge, it is essential to propose a strategy design single-layer metasurface responses in microwave infrared ranges. In work, we proposed method designing meta-atoms, which capable achieving functional electromagnetic response at individually. As demonstration, four different occupation ratios coding permutation features designed, fabricated, tested. band, pixel meta-atom designed realize highly efficient cross-polarization conversion between 5.0 10.0 GHz, shows can behave as ultra-low Radar Cross Section (RCS) reflectors working band; ratio meta-atoms emissivity from 0.60 0.80 3–14 μm, be exhibit digital camouflage pattern. This work promotes ability use achieve RCS reduction simultaneously. The one-layer simple geometry, simplified process, low cost economy, large scale fabrication, promote practical compatible stealth camouflage.

Язык: Английский

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Complete-basis-reprogrammable coding metasurface for generating dynamically-controlled holograms under arbitrary polarization states

Opto-Electronic Advances, Год журнала: 2024, Номер 7(9), С. 240045 - 240045

Опубликована: Янв. 1, 2024

Reprogrammable metasurfaces, which establish a fascinating bridge between physical and information domains, can dynamically control electromagnetic (EM) waves in real time thus have attracted great attentions from researchers around the world. To EM with an arbitrary polarization state, it is desirable that complete set of basis states be controlled independently since incident state decomposed as linear sum these states. In this work, we present concept complete-basis-reprogrammable coding metasurface (CBR-CM) reflective manners, achieve dynamic controls over reflection phases while maintaining same amplitude for left-handed circularly polarized (LCP) right-handed (RCP) waves. Since LCP RCP together constitute planar waves, dynamically-controlled holograms generated under arbitrarily wave incidence. The reconfigurable meta-particle implemented to demonstrate CBR-CM's robust capability controlling longitudinal transverse positions independently. It's expected proposed CBR-CM opens up ways realizing more sophisticated advanced devices multiple independent channels, may provide technical assistance digital environment reproduction.

Язык: Английский

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The Innovation in Planar Optics: Technological Breakthroughs and Application Prospects of Metalens

Precision Engineering, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Язык: Английский

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Research progress on the principle and application of metalenses based on metasurfaces

Journal of Applied Physics, Год журнала: 2025, Номер 137(5)

Опубликована: Фев. 3, 2025

The metalens discussed in this article is a planar optical device built on metasurfaces, utilizing precisely engineered subwavelength nanostructured wires to manipulate electromagnetic waves. This enables precise control over the phase, amplitude, and polarization of these Recent advancements research primarily focus their design principles, performance optimization, imaging enhancement, manufacturing techniques, various application domains. reviews progress development, highlighting principles across different frequency bands applications science technology. Future directions are expected emphasize material innovation, simplification processes, further improvements drive adoption cutting-edge fields.

Язык: Английский

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