New method to eliminate block artifact in high compressed images is presented. Here the emphasis is placed on Hermite transform and we also accentuate on pixel near the block boundaries, and, because it is a polynomial transform with a gaussian window that is in a good agreement with human visual processing procedure.

In this paper, work was carried out to simulate three-dimensional (3-D) tsunami run-up from high resolution remote sensing satellite data of QuickBird. In doing so, the tsunami wave spectra are extracted from QuickBird data using two dimensional di Fourier transform (2-DFFT). The tsunami propagation equation was then solved based on the standard Galerkin finite element approach to simulate 3-D ...

The advantages of the wavelet transform over conventional transforms, such as the Fourier transform, are now well recognized. Because of its excellent locality in time-frequency domain, wavelet transform is remarkable and extensively used for signal analysis, compressing and denoising. Defining DWT by Mallat [1] provided possibility of its digitally hardware or software implementation. The disc...

The classical method of numerically computing the Fourier transform of digitizedfunctions in one or in ddimensions is the so-called discrete Fourier transform ( D F T ) , efficiently implemented as Fast Fourier Transform ( F F T ) algorithms. In m n y cases the D F T is not an adequate appmximation of the continuous Fourier transform. The method presented in this contribution provides accurate ...

Image deformations due to relative motion between an observer and an object may be used to infer 3-D structure. Up to rst order these deformations can be written in terms of an aane transform. Here, a novel approach is adopted to measuring aane transforms which correctly handles the problem of corresponding deformed patches. The patches are ltered using gaussians and derivatives of gaussians an...

We consider a system (M, g, ω,X) where (M, g) is a closed Riemannian manifold, ω a closed one form whose all zeros are nondegenerate and X an (−ω, g) gradient like vector field. For t ∈ R+ large enough, the Witten complex (Ω∗, dt = d ∗ + tω∧) decomposes canonically as a direct sum of two one parameter family of cochain complexes (Ωsm(t), dt ) and (Ωla(t), d ∗ t ). We show that under a mild hypo...