公开(公告)号：US20060181749A1

公开(公告)日：2006-08-17

申请号：US10549781

申请日：2004-04-07

申请人： Richard Browne ,  Robert Canning Jr. ,  Michael Evans ,  Robert Johnson ,  Barry Rubin ,  Douglas Stilwell

发明人： Richard Browne ,  Robert Canning Jr. ,  Michael Evans ,  Robert Johnson ,  Barry Rubin ,  Douglas Stilwell

IPC分类号： H04N1/46

CPC分类号： H04N1/4095 ,  G01N21/59 ,  G01N2021/8663 ,  H04N1/00005 ,  H04N1/00034 ,  H04N1/00045 ,  H04N1/00047 ,  H04N1/0005 ,  H04N1/00068

摘要： An image analysis method to quantify visual showthrough of printed images on the reverse face of planar objects, such as paper. An illumination level is set using a white reference object. A white reference image is stored in a computer memory. An image of a planar object having a printed image on the reverse face is stored in a computer memory. A pixel by pixel ratio of the two images is calculated and a mean value of the ratios is calculated to characterize the visual showthrough. The measurements are substantially independent of both the illumination level and image shading.