Patent ID: 6160919
Filing Date: 2000-12-12
Classification: G06T

Abstract:
A method for compressing samples of seismic exploration signals of subsurface formations, comprising the steps of:(a) storing processed trace data of earth formations into a three dimensional block of seismic samples alone three ortholonal axes,(b) selecting a one-dimensional array x(j) of N of said seismic samples, where N is an integer and each sample x(j) represents a value of a seismic sample at sample j alone one of said axes,(c) partitioning said array x into blocks of M samples, where M is an integer representative of the number of samples of each block, where M<N,(d) folding the samples x.sub.l (j).tbd.x(lM+j) across each block boundary l, according toy.sub.l (-j)=f(j) x.sub.l (j)+f(-j) x.sub.l (-j),y.sub.l (-j)=f(j) x.sub.l (-j)-f(-j) x.sub.l (j),l=1,2, . . . , N/M-1,j=1,2, . . . , M/2-1,y.sub.l (j)=x.sub.l (j), otherwise,where, ##EQU11## (e) transforming the folded samples in each block of array y according to ##EQU12## where ##EQU13## (f) quantizing the transformed samples in each block of array z to produce integers,(g) encoding said integers into a stream of bits representing the compressed array, and(h) storing said stream of bits as a compressed representation of said array.