Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1982-01-29
1984-11-20
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358167, 358 80, H04N 140
Patent
active
044842309
ABSTRACT:
In image reproduction, a method of preventing the reproduction of a defect in an area (74) of the image, which has been indicated as including a defect-containing region, comprises comparing pixel values in a region (A.sub.o) of the said area outside the defect-containing region (72) to ascertain the range of the values of picture elements in a defect-free line or region in the neighborhood of the defect-containing region. Next image values for picture elements in a portion (A.sub.1) of the defect-containing region are compared with the said range of values to ascertain whether any such picture element has a value differing sharply from the said range of values. Any sharply differing value is automatically replaced either by the value of a neighboring picture element in the defect-free line or region, or by the average value of a group of neighboring picture elements in the defect-free line or region, or by values having a similar mean value and similar variation to those in the neighboring defect-free region. Then the values of other picture elements in the defect-containing region are examined and those values which differ sharply from the said range of values are automatically replaced. The defect-containing region is progressively corrected in this way, preferably working from the boundary inwards (A.sub.1, A.sub.2, A.sub.3, A.sub.4) and preferably from each side (A, B, C, D) of a rectangle in turn. When all defects have been removed the stored signals are used to make the reproduction.
REFERENCES:
patent: 3743772 (1973-07-01), Pieters et al.
patent: 3902011 (1975-08-01), Pieters et al.
patent: 4354243 (1982-10-01), Ryan et al.
patent: 4355228 (1982-10-01), Sama et al.
patent: 4377820 (1983-03-01), Reitmeier
patent: 4389677 (1983-06-01), Rushby et al.
patent: 4419693 (1983-12-01), Wilkinson
Britton Howard W.
Coles Edward L.
Crosfield Electronics Limited
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