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485 results on '"Song, Chunlei"'

6. A Generative Adversarial Framework for Optimizing Image Matting and Harmonization Simultaneously

Author

Ren, Xuqian, Liu, Yifan, and Song, Chunlei

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Image matting and image harmonization are two important tasks in image composition. Image matting, aiming to achieve foreground boundary details, and image harmonization, aiming to make the background compatible with the foreground, are both promising yet challenging tasks. Previous works consider optimizing these two tasks separately, which may lead to a sub-optimal solution. We propose to optimize matting and harmonization simultaneously to get better performance on both the two tasks and achieve more natural results. We propose a new Generative Adversarial (GAN) framework which optimizing the matting network and the harmonization network based on a self-attention discriminator. The discriminator is required to distinguish the natural images from different types of fake synthesis images. Extensive experiments on our constructed dataset demonstrate the effectiveness of our proposed method. Our dataset and dataset generating pipeline can be found in \url{https://git.io/HaMaGAN}, Comment: Extension for accepted ICIP 2021

Published
2021

20. Electrocapillarity‐Induced Hurricane‐in‐a‐Tube Enables the Generation and Patterning of Liquid Metal Droplets.

Author

Song, Chunlei, Tao, Xianzan, Chen, Yicheng, Mao, Kaihao, Tao, Ye, Ge, Zhenyou, Wen, Hongyan, Chen, Gaofeng, Li, Biao, Xue, Rui, Jiang, Xikai, Zheng, Xu, and Ren, Yukun

Subjects
*LIQUID metals, *COMPOSITE materials, *INTERFACIAL tension, *SURFACE tension, *ELECTRIC currents
Abstract

Room‐temperature liquid metal droplets (LMDs) are a promising material for various applications in soft robotics, active droplets, and biomedical devices. However, controllable and high‐throughput production of LMDs remains challenging due to their high surface tension and density. Here, a novel strategy is presented to produce LMDs by combining electric field‐induced electrocapillary flow with an external flow field. The basic mechanism is that the electrocapillary flow induced at the LMD/electrolyte interface forms a vortex ring in the electrolyte, creating a hurricane‐like effect in the tube, which in turn causes the liquid metal to deform and eventually pinch off into small droplets. It is demonstrated that droplet size and generation frequency can be controlled precisely by adjusting the applied electric current, flow rate, and surfactant concentration, establishing a relationship between radius and experimental parameters through dimensionless analysis. More importantly, this strategy can handle pendant droplets and facilitate programmable droplet patterning. Leveraging established relationships, flexible control over droplet size and spacing during patterning is attained. Furthermore, an iontronic pressure‐sensitive device based on LMDs and hydrogel is developed to showcase the versatility of the approach. This technique opens up new opportunities for fabricating soft circuits, composite materials, and other functional devices with LMDs. [ABSTRACT FROM AUTHOR]

Published
2024
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36. An Improved Authentication Protocol in Telemedicine System

Author

Zheng, Lijuan, Zhang, Yunjia, Zhang, Rui, Chen, Jianyou, Cui, Meng, Song, Chunlei, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Hu, Ting, editor, Wang, Feng, editor, Li, Hongwei, editor, and Wang, Qian, editor

Published
2018
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43. Effect of Annealing on PL Intensity of NaYF4:Er3+, Yb3+/Ca2+ Phosphor and the Application to Temperature Sensor.

Author

Zhang, Fuli, Guo, Chunlai, Zhang, Zhen, Chen, Xu, Song, Chunlei, and Li, Chengren

Subjects
TEMPERATURE sensors, YTTERBIUM, ANNEALING of crystals, HIGH temperatures, CRYSTAL structure
Abstract

We have prepared NaYF4:Er3+/Yb3+/Ca2+ phosphors using the solvothermal method and discussed the influence of annealing on the crystal structure, morphology, and photoluminescence characteristics in this work. The results show that, with the increase of annealing temperature, the crystallization phase changes from a single cubic structure to a mixed phase of cubic and hexagonal phases and the morphology is also condensed from spherical particles to sheets. In particular, the PL intensity of the annealed phosphor becomes much stronger than that of the unannealed phosphor. An annealed NaYF4:Yb3+, Er3+/Ca2+ phosphor is selected as an example to investigate the performance of high temperature sensor based on the fluorescence intensity ratio between two green emissions. The measurement range and the maximum absolute sensitivity SA of the annealed sensor material are superior to the corresponding parameters of the same phosphor without annealing. The curve of relative sensitivity curve SR decreases as the ambient temperature increases, but that of the revolution δT presents an opposite trend. All the results show that the NaYF4:Er3+/Yb3+/Ca2+ phosphor is more suitable for application on the high temperature sensor after annealing. [ABSTRACT FROM AUTHOR]

Published
2023
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