• Aucun résultat trouvé

Hybrid Wavelet-Fractal Image Coder Applied toRadiographic Images of Weld Defects

N/A
N/A
Info
Télécharger
Protected

Academic year: 2021

Partager "Hybrid Wavelet-Fractal Image Coder Applied toRadiographic Images of Weld Defects"

Copied!
1
0
0

Chargement.... (Voir le texte intégral maintenant)

Texte intégral

(1)

The International Conference on Digital Information and Communication Technology and its Applications (DICTAP)

2011

Hybrid Wavelet-Fractal Image Coder Applied to Radiographic Images of Weld Defects

F. Mekhalfa, D. Berkani

Abstract : Fractal image compression has the advantage in term of its ability to provide a very high compression ratio. Discrete wavelet transform (DWT) retains frequency as well as spatial information of the signal. These structural advantages of the DWT schemes can lead to better visual quality for compression at low bitrate. In order to combine the advantages of wavelet and fractal coding, many coding schemes incorporating fractal compression and wavelet transform have been developed. In this work we evaluate a hybrid wavelet-fractal coder for image compression, and we test its ability to compress radiographic images of weld defects. A comparative study between the hybrid wavelet-fractal coder and pure fractal compression technique have been made in order to investigate the compression ratio and corresponding quality of the image using peak signal to noise ratio.

Keywords : Fractal Compression, Discrete wavelet transform, Hybrid Wavelet-Fractal Image Coder, Radiographic image

Centre de Recherche en Technologies Industrielles - CRTI - www.crti.dz

Powered by TCPDF (www.tcpdf.org)

Références

Télécharger maintenant ( PDF - 1 Page - 7.76 KB )

Documents relatifs

Application of Hybrid Wavelet-Fractal Compression Algorithm for Radiographic Images of Weld Defects

A comparative study between the hybrid coder and standard fractal compression technique have been made in order to investigate the compression ratio and

Hybrid Wavelet-Fractal Image Coder Applied to Radiographic Images of Weld Defects

A comparative study between the hybrid wavelet-fractal coder and pure fractal compression technique have been made in order to investigate the compression ratio

Comparison of fractal compression methodsimpact on radiographic images of weld defects

Fractal image compression, based on concepts of iterated function systems (IFS), consists of partitioning blocks and approximates each block by a transformed codebook block derived

Compression of radiographic images of welddefects based on fractal and wavelet techniques

In this work we evaluate the fractal coder in spatial and wavelet domain, and we investigate its ability to compress radiographic images of weld defects. Keywords : Fractal

B ASED ON F RACTAL AND W AVELET T ECHNIQUES C OMPRESSION OF R ADIOGRAPHIC I MAGES OF W ELD D EFECTS

In this work we evaluate the fractal coder in spatial and wavelet domain, and we investigate its ability to compress radiographic images of weld defects.. Key Words:

Fractal structure of the equilibrium crystal shape. II. Fractal dimensions

The surface consists of an infinite number of facets (the larger the Miller index, the smaller the facet) and of two types of Cantor sets.. It is useful to deal

Singularity spectrum of fractal signals from wavelet analysis: Exact results

We give rigorous proofs that the generalized fractal dimensions [and consequently the f(a) spectrum by Legendre transforming r(q)= (q-l)Dq] of Bernoulli invariant

Solving the inverse fractal problem from wavelet analysis

(3) generally holds for hyperbolic maps, one can apply exactly the same technique to non-linear cookie-cutters. Figure 2a) displays the 1D map extracted from the wavelet transform