Image processor which can add predetermined information to...

Facsimile and static presentation processing – Static presentation processing – Attribute control

Reexamination Certificate

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Details

C358S003050, C358S003130, C358S003140, C358S003160, C358S003190, C358S003220, C358S003230, C358S003280, C382S100000

Reexamination Certificate

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06909524

ABSTRACT:
An image processor unit minimizes image-quality degradation that can be caused by the addition of predetermined information to an image and that enables the predetermined information to be added to the image so that embedded information can be accurately extracted. The image processor unit includes an input unit for inputting the image; a plurality of quantization-threshold setting unit, of which occurrence probability distributions are different from one another, for setting quantization thresholds in terms of probability; a control unit for controlling a regularity for selection of the plurality of quantization-threshold setting unit in units of a predetermined image region according to the predetermined information; and a quantizing unit that uses quantization thresholds set by the quantization-threshold setting unit and thereby quantizes the image according to an error diffusion method.

REFERENCES:
patent: 5818970 (1998-10-01), Ishikawa et al.
patent: 6088489 (2000-07-01), Miyake
patent: 6233347 (2001-05-01), Chen et al.
patent: 6580809 (2003-06-01), Stach et al.
patent: 6590996 (2003-07-01), Reed et al.
U.S. patent application Ser. No. 09/535,545; filed Mar. 27, 2000.
U.S. patent application Ser. No. 08/425,768; filed Apr. 20, 1995.
“Introduction To Special Issue On Processing Of Images For Bilevel Displays And The Generation Of Pseudo-Gray Scale”, Proceedings Of The Society For Information Display, vol. 17, No. 2, Second Quarter 1976, p. 62.
“An Adaptive Algorithm For Spatial Greyscale”, Proceedings Of The Society For Information Display, vol. 17, No. 2, Second Quarter 1976, pp. 75-77.

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