Method and system for decoding distorted image and symbology dat

Details Method and system for decoding distorted image and symbology dat Method and system for decoding distorted image and symbology dat

1996-07-24

1998-07-14

Evans, F. L.

Registers

Coded record sensors

Particular sensor structure

235463, G06K 710

Patent

active

057808309

ABSTRACT:
Disclosed is a system and method for reading and decoding distorted data, e.g., bar code label or other symbology data, by fitting a scanned signal model j(t, .theta.), using a Deterministic Expectation-Maximization (DEM) algorithm, to the measured or detected data signal y(t). The DEM algorithm, which is a novel variation of the conventional Expectation-Maximization (EM) algorithm, enables the system and method according to the invention to determine the values of a plurality of parameters .theta. defining the scanned signal model j(t, .theta.) as it is being fitted to the measured data signal y(t). Based on these values, characteristic information such as data elements or symbols encoded within the image data are generated using conventional signal processing techniques. The use of the DEM algorithm advantageously deblurs the signal by reducing the effects of intersymbol interference. In an alternative embodiment, the DEM algorithm is supplemented by a conventional zero crossings decoding technique. In this manner, the zero crossings technique is used to obtain initial parameter estimates for the DEM algorithm in determining the parameters .theta. of the scanned signal model j(t, .theta.).

REFERENCES:
patent: 4282426 (1981-08-01), Neseem et al.
patent: 5150414 (1992-09-01), Ng
patent: 5262625 (1993-11-01), Tom et al.
patent: 5463211 (1995-10-01), Arends et al.

Affiliated with

Also associated with

Rating

Method and system for decoding distorted image and symbology dat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for decoding distorted image and symbology dat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for decoding distorted image and symbology dat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1884256