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Method for Detecting Optical Defects in Transparencies

Ronald L. Bookout, Michael Gleason, Matthew Thomas, Michael Dixon, Robert Pless, and William D. Smart.
United States Patent 8358830, January 2013.

A method of detecting optical defects in a transparency may comprise the steps of providing a digital image of the transparency having a plurality of image pixels and detecting at least one candidate defect. The candidate defect may be detected by determining a grayscale intensity of each one of the image pixels and calculating an intensity gradient across adjacent pairs of the image pixels. Each image pixel may be assigned a gradient value comprising a maximum of the absolute value of the intensity gradients associated with the image pixel. A gradient image may be constructed comprising the gradient values assigned to corresponding ones of the image pixels. Image pixels may be identified as candidate pixels if such image pixels have a gradient value exceeding a gradient threshold. The candidate pixels may comprise the optical defect.

  author = {Bookout, Ronald L. and Gleason, Michael and Thomas, Matthew and Dixon, Michael and Pless, Robert and Smart, William D.},
  title = {Method for Detecting Optical Defects in Transparencies},
  howpublished = {United States Patent 8358830},
  month = {January},
  year = {2013}