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This paper proposed a novel image fusion framework based on PCNN in NSCT domain. Compared with the contourlet transform(CT), NSCT has translational invariance and can also overcome the image pseudo Gibbs phenomena around singularites. PCNN is evolved from mammal's visual cortex neuron model, and characterized by its pulse synchronization and acquisition of the neurons. Firstly, the source images were...
Image fusion combines information from multiple images of the same scene to obtain a composite image which is more suitable for further image processing tasks. By analyzing the pulse coupled neural network(PCNN), and combining with the characteristics of multi-focus image, a novel PCNN model dual-channel PCNN(Dual-channel PCNN) was proposed in this paper. The mathematical model was first given, then...
Image fusion is the technology that combines more than one images into an image, to lay the foundation for further image processing tasks. The paper proposed a novel image fusion framework based on improved adaptive PCNN. PCNN is evolved from mammal's visual cortex neuron model, and characterized by its pulse synchronization and acquisition of the neurons. It has been proved that it is very suitable...
Face detection has become a hot topic in the field of pattern recognition and computer vision. This paper proposed an improved spatial pattern clustering algorithm, each pixel in a color image will be taken as a pattern which implies not only its feature value but its spatial information. So, the clustering of all pixels of an image is converted to the clustering of the corresponding patterns. The...
Image segmentation is one of the basic and key technologies in image understanding and interpretation. In order to overcome the effect caused by noise, blur and background objects in image segmentation, in this paper an interactive image segmentation method, which combined prior knowledge and geodesic active regions, was proposed. Firstly, the area of target of interest was regarded as one class,...
There are many security issues on P2P network for its open and shared features. A distributed key management scheme is proposed by combining SGC-PKC with secret sharing scheme, security of the scheme is analyzed. The performance bottleneck and single point failure problems are resolved by distributing part of the KGC functions to the network nodes. At the same time, KGC participation is not needed...
According to P2P VoIP signaling protocol security and its distributed features, an authenticated key agreement scheme is proposed by using identity-based cryptography, security, efficiency and key escrow problems are analyzed. According to P2P VoIP media stream security, a secure media stream scheme is proposed and the application problems are discussed. Authentication and privacy are provided for...
Session Initiation Protocol (SIP) plays an important role in VoIP, peer-to-peer (P2P) network has been used as virtual server in SIP, and however, it is difficult to authenticate with each other and to exchange session key because of missing central authority (CA). In this paper, the security threats in Peer-to-Peer SIP (P2PSIP) architecture are analyzed, then a new P2PSIP authenticated key exchange...
According to HMM's strong representation capability of speech signal and GMM's better transformation effect, a method for LSF conversion using HMM combined with GMM is proposed. The theoretical derivation and flow diagram of this algorithm are offered, and gauss model is introduced to achieve the prosodic features transformation. The experiment is applied on two segment speech, and the result reveals...
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