Method and apparatus for omnidirectional reading of data bases

Details Method and apparatus for omnidirectional reading of data bases Method and apparatus for omnidirectional reading of data bases

1984-07-19

1987-09-01

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 44, G06K 920

Patent

active

046913670

ABSTRACT:
A method and apparatus for omnidirectional reading of data fields is provided. Such data fields contain at least one data track containing contrasting printed indicia and a PIC pattern. The PIC pattern indicates the position and orientation of the data tracks. The data field appears at an image window which is scanned by an opto-electronic scanner operating in a point raster scan and individual raster point signals are generated which correspond to the light/dark values of the original image. The signals are stored as a corresponding image arranged in row and column form. A search raster then probes the stored image in a sequence of rows, but the rows of the search raster scan the stored image at a predetermined search angle relative to the rows of the stored image itself upon each pass of the search raster. The video signal produced by each pass of the search raster is examined for the presence or absence of the PIC pattern. Upon recognition of the PIC pattern, the orientation of the data tracks is determined and then the data field is read either in the direction of the data tracks or at right angles to them, and the information they contain is decoded.

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patent: 4424587 (1984-01-01), Wevelsiep et al.
patent: 4589144 (1986-05-01), Namba

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