Inverse halftoning for multi-level halftones

Details Inverse halftoning for multi-level halftones Inverse halftoning for multi-level halftones

2006-08-01

2006-08-01

Rogers, Scott A. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003270, C358S534000

Reexamination Certificate

active

07085015

ABSTRACT:
Techniques for recovering an original image from its halftone version using information obtained from the dither matrix used to generate the halftone. The techniques involve determining a bounding region defined by (xmin, xmax) for each pixel location and color value, based on the information obtained from the dither matrix, and applying a low-pass filter to the halftone version as follows. For each pixel color, the post-low-pass-filtered value of that color is used, if the filtered value is greater than or equal to xminand less than or equal to xmax, the xminvalue is used, if the filtered value is less than xminand the xmaxvalue is used, if the filtered value is greater than xmax. Next, it is determined, for each pixel, whether its value for that color is to be used in an averaging process based on the distance between the bounding region of that pixel and neighborhood pixels' bounding regions.

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