Halftone dot-growth technique based on morphological filtering

Details Halftone dot-growth technique based on morphological filtering Halftone dot-growth technique based on morphological filtering

2008-04-29

2008-04-29

Lamb, Twyler (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003110, C358S003120, C358S003090, C358S003300, C358S001900, C358S518000, C358S534000, C358S003210, C358S003260, C358S003270, C382S257000, C382S260000, C382S261000, C382S275000

Reexamination Certificate

active

07365881

ABSTRACT:
A method for converting an original halftone bitmap image to a color converted halftone bitmap image. A set of asymmetrical morphological filters is provided. The original halftone bitmap image is segmented into blocks and for each block: apply the set of morphological filters to the original halftone bitmap image to produce a set of modified halftone bitmap images; estimate the percent dot area of the original halftone bitmap image and the set of modified halftone bitmap images; a predetermined dot-gain to the percent dot area of the original halftone bitmap image to produce a modified percent dot area; select the modified halftone bitmap image whose percent dot area is closest to the modified percent dot area to produce a block of the color corrected halftone bitmap image; and replace the original halftone bitmap image with the combined blocks of selected modified halftone bitmap image.

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