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A time delay double inverted pendulum model is built to represent a human in quiet standing postural control. A linear stability analysis for the trivial equilibrium is firstly considered. A delay-induced supercritical Hopf bifurcation happens at critical time delay point. The bifurcating periodic solution is calculated analytically by using the method of multiple scales. The reaction speed of brain,...
This paper introduces the design and implementation of a FFMPEG-based stream analysis system. The system supports real-time analysis of media data from a variety type of transmission protocols, media container formats and video / audio coding standards. The system breaks through the limitation of traditional stream analysis system that only supports a specific data format, and is more suitable for...
Along with the prosperity of streaming media business such as OTT (Over the Top) and Live Social Video Broadcasting Platform in recent years, the research on the streaming media processing technique has become a hot issue. This paper makes comprehensive specification of the RTMP (Real Time Message Protocol) in Adobe's Flash streaming media system, and introduces the implementation of software that...
The monitoring of the network transmission quality is more and more significant along with the improvement and popularity of IPTV. The most important work is to monitor packet loss among all the monitoring work. In this paper, we first introduce some related works which all assess video quality by monitoring the packet loss information. The packet loss information includes different frame types, various...
This article describes and analyses the main technologies of MVC (Multi-view video coding) based on H.264, which include MVC temporal scalable, inter-view prediction, parallel processing and structure of MVC bit streams. For further analysis of MVC coding efficiency, some experiments are designed. Compared with the single view coding of simulcast, the MVC compression coding based on the JMVC model...
IPTV services will become main services in the next-generation network. Good video quality is crucial for IPTV operation. In the paper, we give an overview of the state of the art of video quality assessment. Firstly, the impairment factors in IPTV system, including packet loss, jitter and bandwidth, are analyzed about their relationship with subjective perceived quality. Secondly, we discuss the...
Quality assessment plays a crucial role in video processing and application. A no-reference objective assessment method is proposed for MPEG-2 video streams in this paper. Our model is based on an artificial neural network (ANN) with BP algorithm. At first, we directly extract various parameters from video streams and select five representative features as the inputs of our ANN model. These picked-out...
Motivated by partial actions of Hopf algebras on algebras, in this paper we introduce partial coactions of Hopf algebras on coalgebras. The existence of enveloping coactions is also studied.
An objective quality assessment method for H.264 high definition (HD) video streams in the compressed domain is presented in this paper. Based on the H.264 open-source codec project JM12.4, we design an efficient system to extract two video features as the input vectors without fully decoding the videos. These features are analyzed by Least Squares method. Fourteen HD sequences coded at four kinds...
The principle on the electrochemical noise detected by using wavelet transform was described briefly. In the electrochemical noise measurements, there is always having noise more or less. If they are analyzed directly, the useful information and data can not be got from them, so they must be de-noised. Wavelet analysis has many advantages that other signal processing tools do not have, it can provide...
Wavelet analysis has many advantages that other signal processing tools do not have, it can provide characteristics of the signal both in time domain and frequency domain, it has high resolution, and high resulting accuracy. As a result of these characteristics, this article attempts to adopt the appropriate Wavelet filtering method in de-noising the signal of AC impedance techniques of the signal...
A new method to use edge-detection of inhibition zone is proposed. Color image was processed by translating into gray image, removing noise, threshold segment and extracted edge. Edge detection based on traditional method and three kinds of Cellular Automata (CA) methods are applied. The results show the superiority of morphological gradient method of CA.
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