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.
申请公布号
CA2790424(C)
申请公布日期
2014.07.08
申请号
CA20112790424
申请日期
2011.03.01
申请人
THE BOEING COMPANY
发明人
BOOKOUT, RONALD L.;GLEASON, MICHAEL P.;THOMAS, MATTHEW M.;DIXON, MICHAEL S.;PLESS, ROBERT;SMART, WILLIAM D.