Stack filters for 1-to-N bit image processing in electronic prin

Details Stack filters for 1-to-N bit image processing in electronic prin Stack filters for 1-to-N bit image processing in electronic prin

1995-07-14

1996-02-20

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358466, H04N 140, H04N 1405

Patent

active

054934192

ABSTRACT:
The present invention is a method and apparatus for the enhancement of 1 bit per pixel image signals to produce a multiple-bit per pixel form. A binary input image is passed through a plurality of filters to generate level slices. The filters are stack filters implemented as look-up table or template-based filters, morphological filters, or any similar binary-to-binary filters that could be used to generate level slices. Each of the N-1 filters is used to produce the slices, where N is the number of possible gray-scale levels desired in the output image. Once the slices are generated, the resulting binary image data therein is recombined, by adding or stacking, to produce the desired multiple-bit per pixel output.

REFERENCES:
patent: 4926268 (1990-05-01), Kawamura
patent: 5134668 (1992-07-01), Appel
patent: 5339170 (1994-08-01), Fan

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