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Li T.-Y.,Sichuan University | Wang M.-H.,Sichuan University | Huang Z.-J.,Chengdu Aeronautic and Vocational and Technical College | Zhu B.,Yangtze Normal University
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2012

A self-adaptive weighted mean algorithm is proposed for filtering the salt-pepper noise in images. The algorithm detects the noise pixel with minimum-maximum inspection, and then replaces the noise pixel with weighted mean value, where the weight of each pixel in neighborhood is set based on its correlation with the center pixel. The algorithm adapts itself to different noise densities by rectifying the filtering window according to the number of non-extremum pixels in neighborhood. Simulation results showed that, compared with other methods, the proposed algorithm achieves more satisfactory images while it gives better Signal-to-Noise Ratio(SNR) and Mean Squared Error(MSE), and exhibits more excellent in scenarios where the image is highly corrupted.

Zhang X.Y.,Chengdu Aeronautic and Vocational and Technical College | Deng H.C.,Jiangsu Posts And Telecommunications Planning And Designing Institute Coltd | Chen L.W.,Chengdu Aeronautic and Vocational and Technical College
Advanced Materials Research | Year: 2013

To meet the requirement of multimedia video transmission's safety and real-time, this paper provides a conclusion based on video encryption schemes of the encryption algorithm. The solution sorts video data into VLC(variable length code) and FLC(fix-length code),only choose to reconstruction images FLC compared to encrypt the important element of the operation. The analysis and the simulation results show that the encryption scheme is not only high safety but also low cost system. © (2013) Trans Tech Publications, Switzerland.

Tang Y.-F.,Chengdu Aeronautic and Vocational and Technical College | Niu Y.,University of Science and Technology of China | Yin L.,Volkswagen AG | Wang Q.,Chengdu Aeronautic and Vocational and Technical College
Procedia Engineering | Year: 2014

With the development of economy, the existing fire code can not adapt to the modern various special buildings, performance-based building fire protection analysis and design arises at the historic moment, FDS (Fire Dynamics Simulator) as the process of the development of the building fire simulation calculation of the main tool, also have been applied more and more. Based on the FDS, fire power per unit area with 57.5, 44.5, 33.0, 21.7, 14.4kW/m2 is chosen to simulate the open space fire using numerical simulation, and the result is compared to McCaffrey model. The results show that to a certain extent the simulation result of FDS with McCaffrey model has a certain similarity, but it appears a certain difference, even opposite result. © 2014 Published by Elsevier Ltd.

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