Detection of scratches on an image
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United States of America Patent
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Aug 4, 2015
Grant Date -
Jan 23, 2014
app pub date -
Mar 29, 2011
filing date -
Mar 29, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A method for detecting a scratch on a printed image is disclosed, which may include obtaining a digital representation of the printed image and a digital reference image. The method may also include summing values of pixels of pixel lines in at least one segment of the digital representation of the printed image along a suspected direction to obtain a projection signal of the digital representation of the printed image for that segment, and summing values of pixels in a corresponding at least one segment of the digital reference image in the suspected direction to obtain a projection signal of the reference image for the corresponding segment. The method may further include comparing the projection signals to detect dissimilarity indicative of a directional coherence in the suspected direction due to a scratch in the segment of the digital representation of the printed image. Non-transitory computer readable medium and system are also disclosed.
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