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To improve the retrieval rate of contourlet texture image retrieval system, a contourlet-2.3 transform based texture image retrieval system was proposed. In the system, the contourlet transform was contourlet-2.3, a new version of the original contourlet, sub-bands absolute mean energy and kurtosis in each contourlet-2.3 sub-band were cascaded to form feature vectors, and the similarity metric was...
It has become clear that repetitive sequences have played multiple roles in eukaryotic genome evolution including increasing genetic diversity through mutation, changes in gene expression and facilitating generation of novel genes. However, identification of repetitive elements can be difficult in the ab initio manner. Currently, some classical ab initio tools of finding repeats have already presented...
In this paper, the Small Unmanned Aerial Vehicles (SUAVs)' navigation, attitude and velocity control are integrated into a simple, unified Hierarchy-Structured Incremental Dynamic Inversion (HSIDI) control system. Firstly, based on singular perturbation theory, all the variables of the SUAVs' dynamics are divided into four groups according to time-scale, and four Dynamic Inversion (DI) subsystems...
A velocity control approach based on the incremental backstepping (IB) is proposed to enhance the accuracy of the velocity control for the small unmanned aerial vehicles (SUAVs).The velocity control model is first formulated based on the SUAV movement equations and the thrust model. Then, the IB method is applied to the velocity control law design. Feedback of acceleration eliminates sensitivity to...
A novel method to control method of Small Unmanned Aerial Vehicles is presented in this paper. The method is based on the construction of the grey predictor-fuzzy PID controller. Firstly, the transfer function of the control is derived and the PID controller is constructed, then the fuzzy controller based on the error information of the control is established to realize the self-tuning of PID controller...
In order to improve the retrieval rate of the original contourlet transform based texture image retrieval system, a contourlet-2.3 transform based texture image retrieval system was proposed. Generalized Gaussian Density (GGD) model parameters were cascaded to form feature vectors and Kullback-Leibler distance (KLD) function was used for similarity measure. Experimental results on 640 texture images...
This paper studies Regularized Discriminant Analysis (RDA) in the context of automatic airport recognition system for Forward-Looking infrared images (FLIR). When the within class covariance of training sample are sometimes singular, Linear and Quadratic discriminant analysis (LDA & QDA) does not necessarily give the best performance. Alternatives to the usual plug-in (maximum likelihood) estimates...
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