Image analysis – Image enhancement or restoration – Artifact removal or suppression
Patent
1996-01-24
1998-05-05
Vu, Kim
Image analysis
Image enhancement or restoration
Artifact removal or suppression
358463, 348247, H04N 140
Patent
active
057488037
ABSTRACT:
A method and apparatus for the correction of the image values of faulty sensors of an optoelectronic transducer comprising a plurality of sensor elements. In order to avoid errors at light/dark transitions in the scanned original, the erroneous image value of a faulty sensor element is fully corrected in areas of the original having nearly constant brightness values and is only slightly corrected in regions of light/dark transitions (contours) in the original. In order to achieve this, the erroneous image value of a faulty sensor element is replaced by the image value of the sensor element neighboring the faulty sensor element that comprises the least difference from the erroneous image value in terms of amount. Alternatively, the erroneous image value is replaced by the median value calculated from the image value of the faulty sensor element and from the image values of the sensor elements neighboring the faulty sensor element.
REFERENCES:
patent: 4920428 (1990-04-01), Lin et al.
patent: 5499114 (1996-03-01), Compton
patent: 5514865 (1996-05-01), O'Neil
patent: 5654755 (1997-08-01), Hosier
Linotype-Hell AG
Vu Kim
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