Methods and means for embedding machine readable digital data in

Details Methods and means for embedding machine readable digital data in Methods and means for embedding machine readable digital data in

1990-12-27

1994-05-24

Pitts, Harold

Registers

Records

Particular code pattern

235469, 235470, G06K 1906

Patent

active

053150988

ABSTRACT:
The present invention provides methods and means for encoding digital data in the angular orientation of circularly asymmetric halftone dot patterns that are written into the halftone cells of digital halftone images. In keeping with standard practices, the sizes of these halftone dot patterns are modulated in accordance with the grayscale data sample values that are provided to define the image, so the average reflectance or transmittance of each of the halftone cells is modulated to provide a more or less standard halftone rendering of the image. In accordance with this invention, however, provision is made for modulating the angular orientation of the halftone dot patterns in accordance with digital data values, thereby embedding the digital data in the halftone image.

REFERENCES:
patent: 5091966 (1992-02-01), Bloomberg

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