Method and apparatus for reproducing an image without salt and p

Details Method and apparatus for reproducing an image without salt and p Method and apparatus for reproducing an image without salt and p

1994-12-20

1997-10-28

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3582613, H04N 712

Patent

active

056822502

ABSTRACT:
A computer implemented method of preventing the reproduction of specks while reproducing an image including specks represented via source scan lines. According to the method, on a scan like-by-scan line basis, each source scan line signal is transformed into speckless output run lengths. A source run length is selected and examined by a processor to determine whether it represents part of a speck. If the selected source run length might represent a speck, the processor determines whether the selected source run length can be protected from removal. If it cannot, the length of the selected run length and its subsequent neighbor are added to the output run length. As a result, the speck represented by the selected run length disappears from the image by merger with adjacent source run lengths. On the other hand, if the selected source run length is protected from removal, an output run length is output that represents source run length(s) previous to the selected source run length. A new output run length is then defined whose length and color are the same as the selected source run length. Afterward, another source run length is designated as the selected source run length.

REFERENCES:
patent: 4124870 (1978-11-01), Schatz et al.
patent: 4150400 (1979-04-01), Wong
patent: 5579414 (1996-11-01), Fast et al.
patent: 5613146 (1997-03-01), Gove et al.

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