Detecting grassland spatial variation by a wavelet approach

A Unified Approach to Detecting Spatial Outliers

A wavelet based approach to detecting liveness in fingerprint scanners

In this work, a method to provide fingerprint vitality authentication, in order to improve vulnerability of fingerprint identification systems to spoofing is introduced. The method aims at detecting ‘liveness’ in fingerprint scanners by using the physiological phenomenon of perspiration. A wavelet based approach is used which concentrates on the changing coefficients using the zoom-in property ...

Ideal Spatial Adaptation by Wavelet

With ideal spatial adaptation, an oracle furnishes information about how best to adapt a spatially variable estimator, whether piecewise constant, piecewise polynomial, variable knot spline, or variable bandwidth kernel, to the unknown function. Estimation with the aid of an oracle ooers dramatic advantages over traditional linear estimation by nonadaptive kernels; however, it is a priori uncle...

A Fast Wavelet Multilevel Approach to Total Variation Image Denoising

In this paper we present an adaptive multilevel total variational (TV) method for image denoising which utilizes TV partial differential equation (PDE) models and exploits the multiresolution properties of wavelets. The adaptive multilevel TV method provides fast adaptive wavelet-based solvers for the TV model. Our approach employs a wavelet collocation method applied to the TV model using two-...

Detecting Abrupt Changes by Wavelet Methods

The objective of this paper is to contribute to the methodology available for dealing with the detection and the estimation of the location of discontinuities in one dimensional piecewise smooth regression functions observed in white Gaussian noise over an interval. Our approach is nonparametric in nature because the unknown function is not assumed to have any speciic form. Our method relies up...