Key Laboratory of Advanced Display and System Applications

Shanghai, China

Key Laboratory of Advanced Display and System Applications

Shanghai, China
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Xu T.,Shanghai University | Fang Y.,Shanghai University | Fang Y.,Key Laboratory of Advanced Display and System Applications
IASP 10 - 2010 International Conference on Image Analysis and Signal Processing | Year: 2010

A novel nonsubsampled contourlet Bi-linear interpolation algorithm for remote sensing image is proposed, which is based on the estimation of detail nonsubsampled contourlet coefficients at high resolution scales. The method employs Bi-linear interpolation algorithm to anticipate the high frequency component on high resolution from the high frequency component on low resolution. The experiment results demonstrate that the algorithm can get a higher PSNR and keep more image detail information than traditional interpolation algorithms. ©2010 IEEE.


Li W.,Key Laboratory of Advanced Display and System Applications | Yang L.,Key Laboratory of Advanced Display and System Applications | Zhu W.,Key Laboratory of Advanced Display and System Applications | Zhang H.,Key Laboratory of Advanced Display and System Applications | Wei B.,Key Laboratory of Advanced Display and System Applications
Physica Status Solidi (A) Applications and Materials Science | Year: 2016

We reported high-performance organic light-emitting diodes (OLEDs) with a maximum efficiency of 42.3lmW-1 and color rendering index of 92 by facilitating charge carrier transportation and controlling the recombination zone. In addition, we demonstrated that inserting a thin interlayer in emitting layer prevented energy transfer between blue and green emission layers, providing a relative chromatic-stability OLEDs. Furthermore, the device also exhibit a rather low correlated color temperature (2202K), corresponding to an excellent warm WOLED, which could meet the special requirement of energy saving and environment protection. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Gao Z.,Taiyuan University of Technology | Gao Z.,Shanxi Datong University | Wang F.,Key Laboratory of Advanced Display and System Applications | Guo K.,Key Laboratory of Advanced Display and System Applications | And 3 more authors.
Optics and Laser Technology | Year: 2014

The carrier transfer and luminescence characteristic of concentration-dependent tris(2-phenylpyridine) iridium (Ir(ppy)3) doped in 4,4′-bis(carbazol-9-yl)-biphenyl (CBP) film of 40 nm have been investigated. Based on the charge-only devices with different concentration of Ir(ppy)3:CBP, we have found that an increasing dopant concentration can facilitate hole transfer, whereas suppress electrons transfer reversely. The ratio of Ir(ppy)3 in CBP plays a significant role in energy transfer process. Results have shown that excess Ir(ppy)3 possessed a shortened fluorescence lifetime, indicating a concentration quenching effect in Ir(ppy)3:CBP film. The performance of the device decreased rapidly with increasing of doping concentration of Ir(ppy)3 in CBP. A high efficiency of 65.2 cd/A with low efficiency roll-off phosphorescent OLED was achieved, in which 10 wt% Ir(ppy)3 in CBP was light-emitting layer. © 2013 Published by Elsevier Ltd.


Zhou X.,Shanghai University | Fang Y.,Shanghai University | Fang Y.,Key Laboratory of Advanced Display and System Applications | Wang M.,Shanghai University
Journal of Systems Engineering and Electronics | Year: 2010

A compressed sensing (CS) based channel estimation algorithm is proposed by using the delay-Doppler sparsity of the fast fading channel. A compressive basis expansion channel model with sparsity in both time and frequency domains is given. The pilots in accordance with a novel random pilot matrix in both time and frequency domains are sent to measure the delay-Doppler sparsity channel. The relatively nonzero channel coefficients are tracked by random pilots at a sampling rate significantly below the Nyquist rate. The sparsity channels are estimated from a very limited number of channel measurements by the basis pursuit algorithm. The proposed algorithm can effectively improve the channel estimation performance when the number of pilot symbols is reduced with improvement of throughput efficiency.


Zhou X.,Shanghai University | Fang Y.,Shanghai University | Fang Y.,Key Laboratory of Advanced Display and System Applications | Wang M.,Shanghai University
International Conference on Signal Processing Proceedings, ICSP | Year: 2010

To improve the performance of time-varying distributed multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems, a sub-block-wise channel estimation scheme based on discrete prolate spheroidal basis expansion model (DPS-BEM) is proposed. The time-varying channel is well captured by the DPS-BEM, exploiting the unknown channel slepian correlation. The time-variations of the sub-block DPS-BEM coefficients are likely much slower than that of the channel. Thus, the DPS-BEM is more convenient to track in time-varying environments. The DPS - BEM coefficients are estimated via sub-block-wise, based on time-multiplexed periodically transmitted training symbols. Simulation results show that the proposed algorithm can effectively improve the channel estimation performance. © 2010 IEEE.


Zhang C.-Q.,Shanghai University | Guan Y.-P.,Shanghai University | Guan Y.-P.,Key Laboratory of Advanced Display and System Applications
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2015

How to efficiently realize automatic recognition of abnormal behavior for intelligent video surveillance is a key problem. A method has been developed that the dynamic particle flow field from video is got based on the Lagrange dynamic system equation and self-adaptive determination of time interval in the equation. Some motion behaviors for motion objects in video are mapped to the dynamic particle flows which can be used to describe their motion variation states. Some significant motion features for abnormal behavior with different motion styles from different scenes have been extracted to classify and recognize the abnormal behaviors. Some open video test sequences from different scenarios with different behavioral patterns are selected to perform experimental verifications and comparisons. Experimental results show that abnormal behavior can be automatically recognized efficiently in various conditions where it is not necessary to track motion object or collect abnormal behavior sample in advance for learning and training. © 2015, Board of Optronics Lasers. All right reserved.


Fang Y.,Shanghai University | Fang Y.,Key Laboratory of Advanced Display and System Applications | Zhou X.,Shanghai University | Wang M.,Shanghai University
High Technology Letters | Year: 2011

A compressed sensing (CS) based channel estimation algorithm is proposed in the fast moving environment. A sparse basis expansion channel model in both time and frequency domain is given. Pilots are placed according to a novel random unit pilot matrix (RUPM) to measure the delay-Doppler sparse channel. The sparse channels are recovered by an extension group orthogonal matching pursuit (GOMP) algorithm, enjoying the diversity gain from multi-symbol processing. The relatively nonzero channel coefficients are estimated from a very limited number of pilots at a sampling rate significantly below the Nyquist rate. The simulation results show that the new channel estimator can provide a considerable performance improvement for the fast fading channels. Three significant reductions are achieved in the required number of pilots, memory requirements and computational complexity. Copyright © by HIGH TECHNOLOGY LETTERS PRESS.


Zhang Q.-W.,Zhengzhou University of Light Industry | Zhang Q.-W.,Key Laboratory of Advanced Display and System Applications | An P.,Key Laboratory of Advanced Display and System Applications | Zhang Y.,Anhui University of Finance and Economics | And 2 more authors.
Imaging Science Journal | Year: 2013

A depth map represents three-dimensional (3D) scene information, which is used to synthesise virtual views in 3D video coding. Since the quality of synthesised virtual view highly depends on the quality of depth map, efficient depth coding is crucial for the 3D video system. However, depth map is not directly used for display but to generate virtual views. Compressing depth map using existing video coding techniques yields unacceptable distortions in rendered virtual view. Thus, the depth map needs to be compressed in a way that can minimise distortions in the rendered views. To solve this problem, we propose an efficient depth map compression method for view rendering based on view rendering distortion other than depth map distortion itself. Firstly, we derive relationship between distortion in coded depth map and the rendered view. Then, a region-based video characteristic distortion model is proposed to precisely estimate distortion in view synthesis. Finally, a multilateral filtering is applied as an in-loop filter to reduce rendering artefacts. Experimental results show that the proposed method achieves 2 dB coding gain in terms of PSNR and subjective quality improvement of synthesised views. © RPS 2013.


Zhou X.-P.,Shanghai University | Fang Y.,Shanghai University | Fang Y.,Key Laboratory of Advanced Display and System Applications | Wang M.,Shanghai University
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2010

To avoid estimating a large number of coefficients of the traditional channel estimation methods, a compressed sensing (CS) based channel estimation algorithm is proposed in fast fading environment. An angle-delay Doppler spread sparse channel model in space, time and frequency domain is presented. A structurally random pilot matrix is given to measure the angle-delay Doppler sparse multiple-input multiple-output (MIMO) Orthogonal frequency division multiplexing (OFDM) channels. The relatively nonzero channel coefficients are tracked and estimated from a very limited number of channel measurements at a sampling rate significantly below the Nyquist rate. The simulation results show that the new channel estimator can provide a considerable performance improvement in estimating fast fading channels when the significant reduction is achieved in the required number of pilots and computational complexity. © 2010 by Editorial Department of Chinese Journal of Radio Science.


Tang Y.,Shanghai University | Fang Y.,Shanghai University | Fang Y.,Key Laboratory of Advanced Display and System Applications | Huang Q.,Shanghai University | Huang Q.,Key Laboratory of Advanced Display and System Applications
IASP 10 - 2010 International Conference on Image Analysis and Signal Processing | Year: 2010

In order to improve flexibility of surrounding stereo system, a novel system for 3D audio rendering is proposed in this paper based on multi-beam steering, which is composed of five beam units using linear loudspeaker arrays. By controlling accurately time delay or phase of loudspeakers, beam can be formed in a desired direction. The simulation results show that the proposed method is reasonable and effective. ©2010 IEEE.

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