KLT-based quality controlled compression of a single lead egg

Details KLT-based quality controlled compression of a single lead egg KLT-based quality controlled compression of a single lead egg

1999-06-23

2000-11-28

O'Connor, Cary

Surgery

Diagnostic testing

Cardiovascular

600509, 600516, A61B 504

Patent

active

061528838

ABSTRACT:
A compression algorithm for the compression of ECG recordings uses the Karhunen-Loeve Transform (KLT) to transform a set of N sampled ECG beats from a matrix of N.times.M samples into a new form, from which a selected subset can be retained for storage, transmission, or analysis. In order to reduce computation time and storage space, a multirate downsampling operation may be applied, which retains the appropriate spectral information in each block. The downsampled beats are then padded to make them of uniform size, and a Karhunen-Loeve Transform is applied to the sample set. Coefficients from the Karhunen-Loeve Transform of the sample set are retained for reconstruction according to one of two criteria. The average variance of the reconstructed sample set may be controlled, or different numbers of coefficients may be retained for each beat. The KLT compressed data may be reconstituted by reverse KLT transforming the data.

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