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

1994-05-11

1995-11-28

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358466, 382260, 382270, H04N 140, H04N 1407, G06T 500

Patent

active

054713200

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.

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patent: 5270836 (1993-12-01), Kang
patent: 5282057 (1994-01-01), Mailloux et al.
patent: 5301037 (1994-04-01), Kang et al.
Loce and Dougherty, "The Mean-Absolute-Error Theorem for Computational Morphology," Proc. SPIE, vol. 2030, San Diego, Jul. 1993.
Wendt, Coyle and Gallagher, "Stack Filters," IEEE ASSP-34, No. 4, pp. 898-911, 1986.
Lin and Coyle, "Stack Filters and the MAE Criterion," IEEE ASSP-36, No. 8, pp. 1244-1254, 1988.
Lin and Coyle, "Minimum MAE Estimation over the Class of Generalized Stack Filters," IEEE ASSP-38, No. 4, pp. 663-678, 1990.
E. Dougherty and D. Sinha, "Computational Mathematical Morphology," University Laboratory Report MIL-92-17, Morphological Imaging Laboratory, Center for Imaging Science, Rochester Institute of Technology.

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