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This paper presented a SIFT based multiple instance learning algorithm to deal with the problem of pose variation in the tracking process. The MIL algorithm learns weak classifiers by using instances in the positive and negative bags. Then, a strong classifier is generated by powerful weak classifiers which are selected by maximizing the inner product between the classifier and the maximum likelihood...
To avoid the kinematics singularity and thus to implement high dynamic and large-angle maneuvering flight simulation, a kind of serial-parallel hybrid flight simulator are proposed featuring redundant manipulator mechanism. For direct kinematics of the serial-parallel hybrid flight simulator, a dual-Euler method is adopted to solve the expressions of attitude angles, thus computation singularity of...
Towards eliminating the tracking error, this paper proposes an improved backstepping control approach for a quadrotor aircraft. First, a simplified quadrotor model is built in the view of its kinematics characteristics. With this model, the whole system is divided into two subsystems, with three input channels for each of them. Then, by introducing an integral term for each channel, an improved backstepping...
Vector-based amplitude panning in three dimensional sound reproduction aims to preserve both sound image direction and distance perception. While in the estimation process, the loudspeakers are supposed to place on a sphere. It is possible that this requirement cannot be met in home environment. An alternative method to estimate gain factors in vector-based amplitude panning is proposed to preserve...
The urban rail transit communication system is a huge and complex system, which includes the power supply, TV, broadcast and transmission etc. sub-systems. The data and alarm of each subsystem are sent through a variety of different ways to the centralized alarm system, and are converted into a standard format of the alarm information, and the same clock system is adopted for each sub-system. The...
High efficiency audio compression is the basic technology in audio involved multimedia communications. Downmixing and parametric coding is efficient coding scheme with wide applications in some up-to-date audio codecs such as Parametric Stereo (PS) in EAAC+ and MPEG-Surround. Principle Component Analysis (PCA) stereo coding followed this idea to map two channels to one channel with maximum energy...
We analyze four principal parts of “terminal manufacturers- telecom operators- sales channels- consumers” based on the experience of the end-product from the flow from terminal manufacturers to consumers. As for the four principal parts that end-products must passed through from production to sales, we do researches on three aspects which include mobile terminal acquisition, channel management and...
In order to study the retrieval precision of network information and solve the problems existed in search engines this paper analyzes problems and precision in the information retrieval according to experimental data such as image retrieval with different retrieval keywords, and puts forward a new construction of search engine with intelligentization. It comes to a conclusion that many methods can...
An efficient immittance spectral frequency (ISF) parameters quantization algorithm is proposed based on the Gaussian mixture model (GMM). The basic idea of the algorithm is the use of GMM to send the ISF parameters into M Gaussian clusters, ISF parameters are quantized by a Gaussian lattice vector quantizer corresponding to that Gaussian clustering, and the minimal spectral distortion value among...
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