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您的检索式：作者名="Zhonghang He"
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| 1 | Abnormal Crowd Behavior Detection Based on the Entropy of Optical Flow显示文摘To improve the detection accuracy and robustness of crowd anomaly detection,especially crowd emergency evacuation detection,the abnormal crowd behavior detection method is proposed.This method is based on the improved statistical global optical flow entropy which can better describe the degree of chaos of crowd.First,the optical flow field is extracted from the video sequences and a 2D optical flow histogram is gained.Then,the improved optical flow entropy,combining information theory with statistical physics is calculated from 2D optical flow histograms.Finally,the anomaly can be detected according to the abnormality judgment formula.The experimental results show that the detection accuracy achieved over 95%in three public video datasets,which indicates that the proposed algorithm outperforms other state-of-the-art algorithms. | Zheyi Fan Wei Li Zhonghang He Zhiwen Liu | 2019 | Journal of Beijing Institute of Technology2019，28，4： | 1 |
| 2 | Systematic study on size and temporal dependence of micro-LED arrays for display applications显示文摘Micro-LEDs are one of the most promising candidates for next-generation displays,yet they are inconvenienced by the efficiency reduction induced by the sidewall defects when pursuing further scaled-down device dimensions.We have systematically investigated both the size and temporal dependence of micro-LEDs.Micro-LED arrays with a mesa size ranging from 7 to 100μm were prepared for display purposes.The luminance and external quantum efficiency(EQE)were measured and discussed.Surprisingly,micro-LED arrays with a smaller mesa size exhibit a higher EQE under 100 ns pulse duration operation when compared with longer pulse duration operations.Under certain short-pulsed excitation,a 7×7μm^(2)micro-LED array even exhibits a>20%higher EQE as compared to the direct current(DC)or the long duration pulse operation condition.We thus concluded that the notorious efficiency reduction induced by sidewall defects in small-sized micro-LED arrays could be significantly reduced by applying short-pulse voltages. | JUNYANG NIE ZHI ZHANG KONGJIE CHEN YIFENG LIU SHUANG HE ZHONGHANG HUANG XIAONING ZHANG JIE SUN FAN ZHANG YONGSHENG WU QUN YAN | 2023 | Photonics Research2023，11，4： | 0 |
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