Image analysis – Image compression or coding – Quantization
Reexamination Certificate
2005-07-05
2005-07-05
Au, Amelia M. (Department: 2621)
Image analysis
Image compression or coding
Quantization
C382S100000, C358S003280
Reexamination Certificate
active
06915020
ABSTRACT:
Systems and methods for generating graphical bar codes (i.e., images that contain inconspicuous graphical modulations that encode embedded information) by halftoning with embedded graphical encoding are described. In one aspect, a graphical bar code is generated by halftoning regions of an original image. The original image regions incorporate errors diffused among regions of the original image and computed based at least in part upon modulations in the graphical bar code corresponding to a graphical encoding of a message. In another aspect, a graphical bar code is decoded by generating a base image having halftone regions representative of an original image. Regions of the base image are compared probabilistically to a set of graphical code words to obtain a sequence of graphical code words corresponding to a graphical encoding of a message. The sequence of graphical code words is decoded to produce a decoded message.
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Damera-Venkata Niranjan
Yen Jonathan
Au Amelia M.
Sherali Ishrat
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