Quantizing the motion of particles on a Riemannian manifold in the presence of a magnetic field poses the problems of existence and uniqueness of quantizations. Both of them are settled since the early days of geometric quantization but there is still some structural insight to gain from spectral theory. Following the work of Asch, Over & Seiler (1994) for the 2–torus we describe the relation b...

In order to visualize true color images on graphic displays with reduced color resolution, a color quantization process is required. Since color quantization is an NP-hard optimization problem, several suboptimal heuristic approaches, with quite di erent objectives and results, have been proposed. In this paper we present a new hybrid approach in which an evolutionary algorithm is combined with...

Abstract Most of the existing local descriptors unable to perform well in front noise and blur variations. Additionally there are very less persist literature which invariant. To remedy this challenge proposed work launch novel descriptor under changes so-called Noise Blur Invariant Local Descriptor (NABILD). With respect two artificial noises i.e. Gaussian White (GWN) Salt & Pepper (SPN) w...

Reducible gauge theories with constraints linear in the momenta are quantized. The equivalence of the reduced phase space quantization, Dirac quantization and BRST quantization is established. The ghosts of ghosts are found to play a crucial role in the equivalence proof. † On leave of absence from Instituto de Astronomı́a y F́ısica del Espacio, C.C.167, Sucursal 28, 1428 Buenos Aires, Argentina,...

Block truncation coding is a lossy moment preserving quantization method for compressing digital gray-level images. Its advantages are simplicity, fault tolerance, the relatively high compression efficiency and good image quality of the decoded image. Several improvements of the basic method have been recently proposed in the literature. In this survey we will study the basic algorithm and its ...

Topological insulator (TI) thin films with surface magnetism are expected to exhibit a quantized anomalous Hall effect (QAHE) when the magnetizations on top and bottom surfaces parallel, topological magnetoelectric (QTME) have opposing orientations (axion-insulator phase) sufficiently thick. We present unified picture of both effects that associates deviations from exact quantization QTME cause...

The Exponentially Damped Sinusoids (EDS) model can efficiently represent real-world audio signals. In the context of low bit rate parametric audio coding, the EDS model could bring a significant improvement over classical sinusoidal models. The inclusion of an additional damping parameter calls for a specific quantization scheme. In this report, we describe a new jointscalar quantization scheme...

The metric known to be relevant for standard quantization procedures receives a natural interpretation and its explicit use simultaneously gives both physical and mathematical meaning to a (coherentstate) phase-space path integral, and at the same time establishes a fully satisfactory, geometric procedure of quantization. Introduction and Background Purpose and achievements The goal of the pres...

Network-based computer systems play increasingly vital roles in modern society; they have become the target of intrusions by our enemies and criminals. Intrusion detection system attempts to detect computer attacks by examining various data records observed in processes on the network. This paper presents a hybrid intrusion detection system models, using Learning Vector Quantization and an enha...

In the paper, a programmable phase-locked loop (PLL) based ISM band fractional-N frequency synthesizer, commonly used in wireless communication system, is presented. The third order error-feedback Delta-Sigma modulator and high linearity offset phase frequency detector (PFD)/ Charge Pump (CP) are adopted to reduce close-in phase noise due to ∆Σ quantization noise folding. Automatic calibration ...