Detecting image cell position with subpixel accuracy

Details Detecting image cell position with subpixel accuracy Detecting image cell position with subpixel accuracy

1994-05-19

2000-10-10

Porta, David P.

Registers

Coded record sensors

Particular sensor structure

382199, G06K 710

Patent

active

061292788

ABSTRACT:
By providing subpixel accuracy in the detection of the position of an element of a pixel data image, the invention makes possible reductions in scanner and storage resolution of the order of 65 percent or greater for two-dimensional applications. Methods use normalized gray level values to determine the extent of coverage of an image cell by individual pixels. By then applying such gray level values of a plurality of successive pixels to a preconstructed lookup table, ambiguities are resolved to determine the position of cell edges. The cell edge data can be used to determine cell position or used directly in edge-based bar code decoding techniques. Cell position data is used for construction of a virtual image of a bar code or other dataform of interest and virtual image information may then be used for purposes of decoding the bar code or other dataform. For two-dimensional applications, the gray level values of a plurality of successive pixels, as referred to, may be implemented as a sliding window of three such gray level values along successive lines in a first dimension which are applied to a lookup table, followed by repetition for successive lines in a perpendicular dimension, to derive cell edge data for both dimensions.

REFERENCES:
patent: 4720745 (1988-01-01), DeForest et al.
patent: 5286960 (1994-02-01), Longacre et al.
patent: 5296690 (1994-03-01), Chandler et al.
patent: 5329105 (1994-07-01), Klancnik et al.
patent: 5378883 (1995-01-01), Batterman et al.

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