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Ground-state properties of metal/organic-ferromagnet heterojunctions

Physical Review B 2018年第23期98卷 235415-235415页

作者： Yuanyuan Miao Shuai Qiu Guangping Zhang Junfeng Ren Chuankui Wang Guichao Hu Shandong Province Key Laboratory of Medical Physics and Image Processing Technology School of Physics and Electronics Shandong Normal University Jinan 250100 China

Based on an Anderson-like model including the electron-lattice interaction and a Hubbard term, the ground-state properties of metal/organic-ferromagnet heterojunctions are investigated. Both the nonmagnetic and ferromagnetic metals are considered. The results reveal a picture of electron injection and the induced excitations in the organic ferromagnets, which is divided into two regimes with the increase of injected electrons: the first solitonlike interfacial state and the subsequent coexistence of the interfacial state and polaron states. The interfacial state is further explored by the shallow states and localized wave functions with the analysis of the molecular self-consistent Hamiltonian. In the case of the ferromagnetic metal, the effect of the magnetization orientation alignment between the metal and the organic ferromagnet is discussed, where the lowest injection barrier is found when the magnetization orientations of the two components are parallel. An injection-induced degradation of the magnetism of the organic ferromagnet is also obtained. This paper provides a basic understanding of the metal/organic-ferromagnet interface, which is essential for further spintronic study in organic ferromagnetic devices.

关键词： Peierls transition Polarons Spin injection Spin polarization Spintronics Ferromagnets Heterostructures Junctions Organic compounds Anderson impurity model

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Transformer-based Lossless Compression of Aurora Spectral images: A Spatial-Temporal-Spectral Joint Approach 17

Transformer-based Lossless Compression of Aurora Spectral Im...

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17th IEEE International Conference on Signal processing, ICSP 2024

作者： Cao, Xinlong Li, Jiaojiao Li, Yuanqing Yan, Jiapeng Zheng, Zhenxing Xi'an University of Posts & Telecommunications School of Communications and Information Engineering School of Artificial Intelligence Xi'an710121 China Xi'an Key Laboratory of Image Processing Technology and Applications for Public Security Xi'an710121 China International Joint Research Center for Wireless Communication and Information Processing Technology of Shaanxi Province Xi'an710121 China

ISBN: (纸本)9798350387384

Aurora spectral image lossless compression has seen significant advancements in recent years. However, most compression algorithms are based on traditional image compression techniques, focusing solely on spectral and spatial correlations without considering temporal correlations. To further enhance compression performance, this paper proposes a Transformer-based point-by-point prediction algorithm for auroral spectral images, which simultaneously uses spatial, spectral and temporal contexts for prediction. Our prediction network consists of two parts: an encoder and a decoder. The encoder is composed of the encoding unit of the original Transformer and is used to extract features from spatial, spectral and temporal contexts. The decoder consists of fully connected layers and is used for prediction. Experimental results show that the average bitrate of this method is reduced by 0.179 bpp compared with the JPEG2000 algorithm, and the average bitrate is reduced by 0.054 bpp compared with the online DPCM algorithm. © 2024 IEEE.

关键词： image compression

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Niobium telluride absorber for a mode-locked vector soliton fiber laser

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 130-138页

作者： XinXin Shang NanNan Xu Jia Guo Shuo Sun HuaNian Zhang SWageh Ahmed AAl-Ghamdi Han Zhang DengWang Li Shandong Province Key Laboratory of Medical Physics and Image Processing Technology Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250014China Institute of Microscale Optoelectronics Collaborative Innovation Center for Optoelectronic Science&TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro-Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Niobium telluride(NbTe_(2)),an emerging transition metal dichalcogenide material,has been theoretically predicted to have nonlinear absorption properties and excellent optical ***,only a few studies of the utilization of NbTe_(2)in ultrafast photonics have been *** this work,a NbTe_(2)-based saturable absorber(SA)was applied in an erbium-doped fiber as a mode-locked device,and a vector soliton based on NbTe_(2)was obtained for the first ***_(2)-PVA film SA was successfully prepared by the liquid-phase exfoliation and spin coating methods,with a modulation depth of up to 10.87%.The nonlinear absorption coefficient of NbTe_(2)-based SA film tested through the open-aperture Z-scan laser measurement is 0.62×10^(−11) m/W.A conventional soliton with a pulse duration of 858 fs was generated using NbTe_(2)-based SA,which was demonstrated to be a kind of polarization-locked vector soliton in further *** experimental results reveal the nonlinear optical properties of NbTe_(2)and broaden its applications in ultrafast photonic devices.

关键词： niobium telluride saturable absorber mode-locked pulse fiber laser

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image Retrieval Based on Bit-Plane Distribution Feature

Image Retrieval Based on Bit-Plane Distribution Feature

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Zhao Shan Liu Jing School of Computer Science and technology Henan Polytechnic University Jiaozuo China Jiangsu Province Key Laboratory on Image Processing and Image Communication Nanjing University of Posts and Telecommunications Nanjing China

Based on the analysis of color histogram for image retrieval, a new descriptor, bit-plane distribution feature (BPDF), is proposed in this paper. The image is firstly divided into eight bit-planes. Meantime, the Gray code of bit-planes is used to avoid the effect of changes in the intensity values on bit-planes. Then, according to the distribution of each bit-plane, a feature vector is constructed by the first four significant planes which contain most of the structural information of the image. Finally, the Mahalanobis distance is adopted to measure the similarity because of the correlation between the concerned vectors after designing a correlation-weighted matrix. Comparisons are conducted between BPDF and other descriptors. Experimental results show that the proposed method provides more significantly retrieval results than the traditional ones.

关键词： image retrieval Histograms Quantization Computer science image color analysis Reflective binary codes Fuzzy systems image processing image communication image analysis

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Using Structural degradation and Parallax for reduced-reference quality assessment of 3D images

Using Structural degradation and Parallax for reduced-refere...

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IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Qi Xu Guangtao Zhai Min Liu Ke Gu Institute of Image Communication and Information Processing Shanghai Key Laboratory of Digital Media Processing and Transmissions Shanghai China

Owing to the thriving market of stereoscopic image based applications, efficient and effective 3D image quality assessment (IQA) techniques become colossally required these days. Consequently, we introduce a new reduced-reference (RR) stereoscopic image quality metric to meet this demand, through measuring Structural degradation and Saliency based Parallax compensation Model (SSPM). Experimental results on the LIVE 3D image Quality Database, including both symmetrically and asymmetrically distorted stereoscopic images in different categories and quality levels, are provided to justify the effectiveness of the proposed SSPM model as compared to some existing progressive and popular stereoscopic IQA approaches. Meanwhile, it deserves broad attentions that only four number pairs, extracted from original image, are required as the key feature to be sent to the receiver terminal, thus making this procedure also efficient.

关键词： Three-dimensional displays Stereo image processing Measurement image quality Databases Degradation Nonlinear distortion

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Blind image quality assessment for noise

Blind image quality assessment for noise

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IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Min Liu Guangtao Zhai Zhenyu Zhang Yuntao Sun Ke Gu Xiaokang Yang Institute of Image Communication and Information Processing Shanghai Key Laboratory of Digital Media Processing and Transmissions Shanghai China

image denoising has been fanatically researched for a very long time in that it is a commonplace yet important subject. The task to testify the performance of different image de-noising methods always resorts to PSNR in the past, until the emergence of SSIM, a landmark image quality assessment (IQA) metric. Since then, a vast majority of IQA methods were introduced in terms of various kinds of models. But unfortunately, those IQA metrics are along with more or less deficiencies such as the requirement of original images, making them far less than the ideal approaches. To address this problem, in this paper we propose an effective and blind image quality assessment for noise (dubbed BIQAN) to approximate the human visual perception to noise. The BIQAN is realized with three important portions, namely the free energy based brain principle, image gradient extraction, and texture masking. We conduct and compare the proposed BIQAN and a large amount of existing IQA metrics on three largest and most popular image quality databases (LIVE, TID2013, CSIQ). Results of experiments prove that the BIQAN has acquired very encouraging performance, outperforming those competitors stated above.

关键词： Measurement image quality Quality assessment Indexes PSNR

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Transclaw U-Net: Claw U-Net With Transformers for Medical image Segmentation 5

Transclaw U-Net: Claw U-Net With Transformers for Medical Im...

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5th International Conference on Information communication and Signal processing, ICICSP 2022

作者： Yao, Chang Hu, Menghan Li, Qingli Zhai, Guangtao Zhang, Xiao-Ping East China Normal University Shanghai Key Laboratory of Multidimensional Information Processing Shanghai China Institute of Image Communication and Information Processing Shanghai Jiao Tong University Shanghai China Ryerson University Department of Electrical Computer and Biomedical Engineering Toronto Canada

ISBN: (纸本)9781665485890

In medical image analysis, the long-range spatial features are often not accurately obtained by the traditional convolutional neural networks. Hence, we propose a TransClaw U-Net network structure. The transformer part is added after three convolution operations to fuse shallow features extracted by convolution operations for maximally encoding the long-range spatial features between patches. The 'Claw' in TransClaw U-net means that we add the bottom upsampling part to retain the deepest feature information for detail segmentation. In addition, the modified three-channel global attention mechanism to blend the outputs of three channels (the encoding part, the bottom upsampling part and the decoding part) to effectively extract image contours. The experimental results on Synapse Multi-organ Segmentation Dataset show that TransClaw U-Net performs better than other networks. The results of ablation experiments prove the effectiveness of the three improved components of the network and influence of input image size and skip-connection numbers on network performance. The source code will be publicly available once the paper is accepted. © 2022 IEEE.

关键词： Convolution

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Separation of superimposed images with unknown motions using sparsity priors

Separation of superimposed images with unknown motions using...

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IEEE Visual communications and image processing (VCIP)

作者： Qing Yan Xiaokang Yang Yi Xu The Institute of Image Communication and Information Processing Shanghai Key Laboratory of Digital Media Processing and Transmission Shanghai China

When people take photos through a transparent surface, it is ubiquitous that the images are superimposed with two source images, the transmitted layer and the reflected layer. In this paper, we utilize the sparsity priors over image color distribution and image gradients, and we realize the separation of such images by exploiting the diversity (relative motions of source images) in different snapshots. Our approach can estimate the motion even when layer image is quite faint, extract layer gradients when layer intensity is unchanged, and obtain a reliable separation by considering the gradients as limitations. The effectiveness of our approach is shown in experiments on both synthetic images and real world photos.

关键词： image color analysis Feature extraction Transforms Transmission line matrix methods Reliability PSNR Surface morphology

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Simultaneous triple subtitles exhibition via Temporal Psychovisual Modulation

Simultaneous triple subtitles exhibition via Temporal Psycho...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Chunjia Hu Guangtao Zhai Zhongpai Gao Xiongkuo Min Institute of Image Communication and Information Processing Shanghai Key Laboratory of Digital Media Processing and Transmissions Shanghai China

ISBN: (纸本)9781479943142

With the quick acceleration of cultural exchange and globalization, multi-language annotation for in-theatre movie exhibition is gaining more attention. The existing solution overlays a stack of subtitles in different languages over the movie, for example, the familiar combination of English + local tongue as seen in the cinema today. However, a major drawback of this straightforward piling-up type of solution is that as the required number of languages increases, the subtitle area grows and it may eventually span over the movie contents. An effective multi-language subtitling system without compromising the movie watching experience is therefore highly desired. In this paper, we propose a new Temporal Psychovisual Modulation (TPVM) based solution to the multi-language subtitling problem. TPVM is a new paradigm of information display exploiting the mismatch between high refresh rate of the modern optoelectronic displays and limited temporal resolution of the human visual system (HVS). In this work, we design a simultaneous triple subtitle exhibition system using 2 120 Hz stereoscopic DLP projectors with linear polarization filters and LCD shutter glasses. Wearing different pairs of glasses, the audience can enjoy the movie with 3 optional subtitles without interfering with the audience without the glasses and see the movie directly. Extended experimental results will be given in this paper to justify the effectiveness and robustness of the proposed multiple subtitling system.

关键词： Glass Motion pictures Modulation Stereo image processing Synchronization Visual systems Liquid crystal displays

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A research of heart rate prediction model based on evolutionary neural network

A research of heart rate prediction model based on evolution...

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2011 IEEE International conference on Intelligent Computation and Bio-Medical Instrumentation, ICBMI 2011

作者： Xiao, Feng Yuchi, Ming Ding, Mingyue Jo, Jun Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Life College of Science and Technology Huazhong University of Science and Technology Wuhan China School of Information and Communication Technology Griffith University QLD Australia

ISBN: (纸本)9780769546230

Heart rate (HR) signal analysis is widely used in the medicine and medical research area. Physical activities (PA) are commonly recognized to greatly affect the changes of heart rate. A method of Evolutionary Neural Network - Neuro-evolution of Augmenting Topologies (NEAT) is used to build a PA-based HR predictor model. Through special coding, crossover and mutation operator, NEAT can implement network topology and connectivity weights evolution simultaneously. The common problem in evolutionary neural network, like competing conventions, how to protect the new innovation are effectively solved. The experimental results demonstrated the application potential of the approach. © 2011 IEEE.

关键词： Neural networks

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