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Hierarchical Visual Attention Model for Saliency Detection Inspired by Avian Visual Pathways

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IEEE/CAA Journal of Automatica Sinica 2019年第2期6卷 540-552页

作者： xiaohua wang Haibin Duan the State Key Laboratory of Virtual Reality Technology and Systems School of Automation Science and Electrical Engineering Beihang University the State Key Laboratory of Virtual Reality Technology and Systems School of Automation Science and Electrical EngineeringBeihang University the Peng Cheng Laboratory

Visual attention is a mechanism that enables the visual system to detect potentially important objects in complex environment. Most computational visual attention models are designed with inspirations from mammalian visual ***, electrophysiological and behavioral evidences indicate that avian species are animals with high visual capability that can process complex information accurately in real time. Therefore,the visual system of the avian species, especially the nuclei related to the visual attention mechanism, are investigated in this paper. Afterwards, a hierarchical visual attention model is proposed for saliency detection. The optic tectum neuron responses are computed and the self-information is used to compute primary saliency maps in the first hierarchy. The "winner-takeall" network in the tecto-isthmal projection is simulated and final saliency maps are estimated with the regularized random walks ranking in the second hierarchy. Comparison results verify that the proposed model, which can define the focus of attention accurately, outperforms several state-of-the-art *** study provides insights into the relationship between the visual attention mechanism and the avian visual pathways. The computational visual attention model may reveal the underlying neural mechanism of the nuclei for biological visual attention.

关键词： Avian visual pathways bio-inspired saliency detection visual attention

Biologically adaptive robust mean shift algorithm with Cauchy predator-prey BBO and space variant resolution for unmanned helicopter formation

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Science China(Information Sciences) 2014年第11期57卷 195-207页

作者： wang xiaohua DUAN HaiBin State Key Laboratory of Virtual Reality Technology and Systems Beihang University

Visual tracking technology can provide measurement information for unmanned helicopter formation and thus, more attention is being paid to this research area. We propose a novel mean shift(MS) algorithm that is both adaptive and robust for unmanned helicopter formation and apply it to the leading unmanned helicopter tracking. The movement of an unmanned helicopter is very flexible and changeable, which makes the tracking there of more difficulty than for common targets. In creating an algorithm that can adapt to the acceleration of the unmanned helicopter and estimates both the scale and orientation of the movement changes, we combine the traditional MS with the bio-inspired Cauchy predator-prey biogeography-based optimization(CPPBBO)evolutionary algorithm, and also the space variant resolution(SVR) mechanism of the human visual system(MS-CPPBBO-SVR). To demonstrate the effectiveness and robustness of the proposed method and justify the importance of the CPPBBO algorithm and SVR mechanism at the same time, a series of comparative experiments were carried out. The experimental results of the proposed MS-CPPBBO-SVR method are compared with other competitive tracking methods, such as MS, MS with SVR(MS-SVR), MS-SVR with several other optimization algorithms, and the robust particle filter algorithm. The experimental results demonstrate that our proposed tracking approach, MS-CPPBBO-SVR, is more adaptive, robust and efficient in target tracking than the other methods.

关键词： unmanned helicopter formation tracking mean shift biogeography-based optimization(BBO) predator-prey space variant resolution(SVR)

Image retrieval based on color features integrated with anisotropic directionality

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Journal of Systems Engineering and Electronics 2010年第1期21卷 127-133页

作者： Jing Bai xiaohua wang Licheng Jiao Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education of China Institute of Intelligent Information Processing Xidian University Xi'an 710071 P. R. China

A novel image retrieval approach based on color features and anisotropic directional information is proposed for content based image retrieval systems （CBIR）. The color feature is described by the color histogram （CH）, which is translation and rotation invariant. However, the CH does not contain spatial information which is very important for the image retrieval. To overcome this shortcoming, the subband energy of the lifting directionlet transform （L-DT） is proposed to describe the directional information, in which L-DT is characterized by multi-direction and anisotropic basis functions compared with the wavelet transform. A global similarity measure is designed to implement the fusion of both color feature and anisotropic directionality for the retrieval process. The retrieval experiments using a set of COREL images demonstrate that the higher query precision and better visual effect can be achieved.

关键词： image retrieval color histogram directionlet transform anisotropic similarity.

Design of twodimensional digital filters using neural networks

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Journal of Systems Engineering and Electronics 2005年第4期16卷 767-771页

A new approach for the design of two-dimensional （2-D） linear phase FIR digital filters based on a new neural networks algorithm （NNA） is provided. A compact expression for the transfer function of a 2-D linear phase FIR filter is derived based on its frequency response characteristic, and the NNA, based on minimizing the square-error in the frequency-domain, is established according to the compact expression. To illustrate the stability of the NNA, the convergence theorem is presented and proved. Design examples are also given, and the results show that the ripple is considerably small in passband and stopband, and the NNA-based method is of powerful stability and requires quite little amount of computations.

关键词： 2-D linear-phase FIR digital filters neural network convergence theorem stability.

Inactivated properties of activated carbon-supported TiO_2 nanoparticles for bacteria and kinetic study

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Journal of Environmental Sciences 2008年第12期20卷 1527-1533页

作者： LI Youji MA Mingyuan wang Xiaohu wang xiaohua College of Chemistry and Chemical Engineering Jishou University Hunan 416000 China

The activated carbon-supported TiO2 nanoparticles(TiO2/AC)were prepared by a properly controlled sol-gel *** effects of activated carbons(AC)support on inactivated properties of TiO2 nanoparticles were evaluated by photocatalytic inactivation experiments of Escherichia *** key factors affecting the inactivation effciency were investigated,including electric power of lamp, temperature,and pH *** results show that the TiO2/AC composites have high inactivation properties of *** in compari...

关键词： inactivation activated carbon-supported TiO2 sol-gel method bacteria

Using the resource-environment-economy coordination degree model to guide China's national blue bay remediation action plan in Qingdao

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Journal of Oceanology and Limnology 2020年第6期38卷 1846-1857页

作者： SUI Xiaotong wang xiaohua ZHAO Lingdi School of Economics Ocean University of ChinaQingdao 266000China Marine Development Studies Institute of OUC Key Research Institute of Humanities and Social Sciences at UniversitiesMinistry of EducationQingdao 266000China Sino-Australian Research Centre for Coastal Management UNSW CanberraBC 2610Australia

The China National Blue Bay Remediation Action Plan(NBBRAP)is a crucial step towards achieving the overall goal of building a maritime power and a beautiful *** paper presents the resource-environment-economy(REE)composite system from the three-dimensional perspective of ***,through the coordination degree model of the composite system based on the order degree of subsystems,empirical analysis of the coordination degree of the REE composite system in a typical coastal city Qingdao from 2005 to 2016 was carried *** indicate that the degree of coordination and interactive coordination of the REE composite system in Qingdao were in a low-quality ***'s economy development depended largely on the expense of over-exploitation of resources and environmental degradation in *** policy implementation was less persistent in 2009-2010 and *** immediate stimulating effect was significant,making the coordination degree of the REE composite system fluctuate in a volatile *** of the coordination degree of the REE composite system has practical guiding significance for the successful implementation attainment of the NBBRAP target in Qingdao and is conducive to deepening the learning and promotion of this plan in other coastal cities.

关键词： China National Blue Bay Remediation Action Plan resource-environment-economy coordination

Efficient hybrid method for time reversal superresolution imaging

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Journal of Systems Engineering and Electronics 2015年第1期26卷 32-37页

作者： xiaohua wang Wei Gao Bingzhong wang School of Physical Electronics University of Electronic Science and Technology of China

An efficient hybrid time reversal（TR） imaging method based on signal subspace and noise subspace is proposed for electromagnetic superresolution detecting and imaging. First, the locations of targets are estimated by the transmitting-mode decomposition of the TR operator（DORT） method employing the signal subspace. Then, the TR multiple signal classification（TR-MUSIC）method employing the noise subspace is used in the estimated target area to get the superresolution imaging of targets. Two examples with homogeneous and inhomogeneous background mediums are considered, respectively. The results show that the proposed hybrid method has advantages in CPU time and memory cost because of the combination of rough and fine imaging.

关键词： time reversal(TR) decomposition of the time-reversal operator(DORT) method multiple signal classification(MUSIC) method superresolution imaging

Noble Metal-Doped In_2O_3 for Enhancing Response to H_2

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稀有金属材料与工程 2006年第A03期35卷 136-139页

作者： Jiaqiang Xu xiaohua wang Jianian Shen College of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China Institute of Materials Shanghai University Shanghai 200072 China

Nanocrystalline In_2O_3 was synthesized through a controllable solvothermal process in one-step at 210℃for 24 h. Gas sensing properties were tested by mixing gas in air in static *** 268.5℃,the nanocrystal showed high sensitivity to LPG but lower sensitivity to H_2 and *** order to enhance the sensitivities to H_2 and CO,0.5 mass % Au and Pd were doped by an impregnation *** sensitivities to H_2 and CO were increased under different working ***-doped In_2O_3 was superior to Pd-doped In_2O_3 whatever to H_2 or CO;the sensitivity was increased with the increase of working temperature;gas sensing properties to H_2 overmatched to CO.

关键词： solvothermal process indium oxide noble metal H2 sensor

Multicomponent SF6 decomposition product sensing with a gas-sensing microchip

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Microsystems & Nanoengineering 2021年第2期7卷 35-50页

作者： Jifeng Chu Aijun Yang Qiongyuan wang Xu Yang Dawei wang xiaohua wang Huan Yuan Mingzhe Rong State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University710049Xi’anChina

A difficult issue restricting the development of gas sensors is multicomponent recognition. Herein, a gas-sensing (GS) microchip loaded with three gas-sensitive materials was fabricated via a micromachining technique. Then, a portable gas detection system was built to collect the signals of the chip under various decomposition products of sulfur hexafluoride (SF6). Through a stacked denoising autoencoder (SDAE), a total of five high-level features could be extracted from the original signals. Combined with machine learning algorithms, the accurate classification of 47 simulants was realized, and 5-fold cross-validation proved the reliability. To investigate the generalization ability, 30 sets of examinations for testing unknown gases were performed. The results indicated that SDAE-based models exhibit better generalization performance than PCA-based models, regardless of the magnitude of noise. In addition, hypothesis testing was introduced to check the significant differences of various models, and the bagging-based back propagation neural network with SDAE exhibits superior performance at 95% confidence.

关键词： technique. generalization testing