Digital halftoning method utilizing diffused weighting and...

Details Digital halftoning method utilizing diffused weighting and... Digital halftoning method utilizing diffused weighting and...

2008-08-07

2011-12-13

Haskins, Twyler (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003040, C358S003010, C358S001900, C382S100000

Reexamination Certificate

active

08077355

ABSTRACT:
The present invention discloses a digital halftoning method. The method comprises steps of: (a1) dividing an original image into non-overlapping blocks; (a2) obtaining a Least-Mean-Square trained (LMS-trained) filter by comparing at least a training image and a halftone result corresponding to the training image (a3) optimizing a class matrix with the LMS-trained filter, which involves the diffused area and the diffused weightings; and (a4) processing the non-overlapping blocks by performing a dot diffusion procedure with the optimized class matrix and the diffused weightings to generate a halftone image corresponding to the original image. A detailed class matrix optimizing method as in the above-mentioned step (a3) is also disclosed.

REFERENCES:
patent: 6563957 (2003-05-01), Li et al.
patent: 2006/0034483 (2006-02-01), Au et al.
patent: 2007/0121165 (2007-05-01), Ando et al.
Improved Dot Diffusion Using Optimized Diffused Weighting and Class Matrix.

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