Patent ID: 6091834
Filing Date: 2000-07-18
Classification: G01N,H04N

Abstract:
A method of generating a digital representation of an image on a record medium, the method comprising:a) illuminating said medium in a first manner to cause radiation from said medium to impinge on a sensing device which generates a first digital representation of the appearance of said medium;b) illuminating said medium in a second manner such that radiation from imperfections on said medium has enhanced brightness in comparison with radiation from other parts of said medium and causing said radiation to impinge on the sensing device to generate a second digital representation of the appearance of said medium; and,c) modifying said first digital representation to remove the effect of said imperfections by reference to said second digital representation to generate a digital representation of the image;wherein c) includes generating a value in said first digital representation for each pixel corresponding to an imperfection by a method of interpolation or replication.