US 2006/0213999 A1 · Synthesis decoding and methods of use thereof

Abstract

Systems and methods for successfully decoding optical images of objects of interest when such objects are situated outside a conventional working range of an imaging system, or when such objects are degraded. The systems and methods are based upon a comparison of computed signals corresponding to distorted images that would be obtained from known objects, such as barcodes, when viewed outside a working range, or when degraded, with actual signals obtained from the object of interest. The computed signals in one embodiment are recorded in a lookup table. An advantage of the systems and methods disclosed is that there results a smooth, monotonic probability of correctly decoding the image of interest, even beyond the working distance. A handheld or portable apparatus useful for practicing the invention is also disclosed.

Claims12

Dependent claims

A bar code reading apparatus for decoding a degraded encoded symbol character, comprising:

a detector that detects light intensity corresponding to illumination reflected from said degraded encoded symbol character and that generates an electrical signal from said detected light intensity, said degraded encoded symbol character failing to represent a valid encoded symbol character of a symbology lacking error correction coding at an encoded symbol character level;
and
a signal processor that recovers from said generated electrical signal a value representative of a valid encoded symbol character of said symbology.

A hand held bar code reading apparatus for decoding a degraded encoded symbol character, comprising:

a trigger mechanism configured to receive a trigger signal and to generate an initiation signal;
a detector that, responsive to said initiation signal, automatically detects light intensity corresponding to illumination reflected from said degraded encoded symbol character and that generates an electrical signal from said detected light intensity, said degraded encoded symbol character failing to represent a valid encoded symbol character of a symbology lacking error correction coding at an encoded symbol character level;
and
a signal processor that, responsive to said initiation signal, automatically recovers from said generated electrical signal a value representative of valid encoded symbol character of said symbology.

1 more element

Dependencies are inferred from the claim text.

Synthesis decoding and methods of use thereof

Life of this patent

Synthesis decoding and methods of use thereof

Life of this patent

Abstract

Claims12