Patent ID: 9098897
Filing Date: 2015-08-04
Classification: G06T,H04N

Abstract:
1. A method for detecting a scratch on a printed image, the method comprising: obtaining, by a computing device, a digital representation of the printed image and a digital reference image; summing, by the computing device, 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; and comparing, by the computing device, the projection signals to detect dissimilarity indicative of a directional coherence in the suspected direction due to a scratch in said at least one segment of the digital representation of the printed image.