Lapped transforms and hidden Markov models for seismic data filtering

Laurent Duval (1) , Caroline Chaux (2)

1 IFPEN - IFP Energies nouvelles
2 LIGM - Laboratoire d'Informatique Gaspard-Monge

Seismic exploration provides information about the ground substructures. Seismic images are generally corrupted by several noise sources. Hence, efficient denoising procedures are required to improve the detection of essential geological information. Wavelet bases provide sparse representation for a wide class of signals and images. This property makes them good candidates for efficient filtering tools, allowing the separation of signal and noise coefficients. Recent works have improved their performance by modelling the intra- and inter-scale coefficient dependencies using hidden Markov models, since image features tend to cluster and persist in the wavelet domain. This work focuses on the use of lapped transforms associated with hidden Markov modelling. Lapped transforms are traditionally viewed as block-transforms, composed of M pass-band filters. Seismic data present oscillatory patterns and lapped transforms oscillatory bases have demonstrated good performances for seismic data compression. A dyadic like representation of lapped transform coefficient is possible, allowing a wavelet-like modelling of coefficients dependencies. We show that the proposed filtering algorithm often outperforms the wavelet performance both objectively (in terms of SNR) and subjectively: lapped transform better preserve the oscillatory features present in seismic data at low to moderate noise levels.

Mots clés: seismic data filtering; lapped transforms; hidden Markov models

Domaines: Traitement du signal et de l'image [eess.SP]; Bio-informatique [q-bio.QM]

Laurent Duval, Caroline Chaux. Lapped transforms and hidden Markov models for seismic data filtering. International Journal of Wavelets, Multiresolution, and Information Processing, 2004, 2 (4), pp.455-476. ⟨10.1142/S0219691304000676⟩. ⟨hal-01330595⟩