Method for data compression

Details Method for data compression Method for data compression

1993-06-01

1997-01-21

Boudreau, Leo

Image analysis

Image compression or coding

Shape, icon, or feature-based compression

382245, 382252, 348384, G06K 936

Patent

active

055966586

ABSTRACT:
Compression of a plurality of signal samples y(t.sub.0),y(t.sub.1),y(t.sub.2) . . . y(t.sub.z) may be accomplished by performing a first linear regression to obtain a curve fitted thereto which is represented by a polynomial having a first set of coefficients (a.sub.0,a.sub.1,a.sub.2,a.sub.3 . . . a.sub.n) which is stored in memory (18) or transmitted by a transmitter (20). The error between each of the actual signal samples (y(t.sub.0),y(t.sub.1),y(t.sub.2) . . . y(t.sub.z) and the value approximated by the curve fitted to the values is computed and then thresholded. A second regression analysis is then performed to fit a curve, having a second set of coefficients (b.sub.0,b.sub.1,b.sub.2,b.sub.3 . . . b.sub.q) to the thresholded error values. The second set of coefficients is also stored or transmitted and used, in conjunction with the first set of coefficients, to closely approximate the original set of signal samples.

REFERENCES:
patent: 4771474 (1988-09-01), Takashima et al.
patent: 5127063 (1992-06-01), Nishiya et al.
Tretter, Discrete-Time Signal Processing, John Wiley & Sons pp. 355-358 (1976).
Neagoe, "Predictive Ordering and Linear Approximation for Image Data Compression", IEEE Trans. on Comm, vol. 36, No. 10, pp. 1179-1182 (1988).

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