METHOD AND APPARATUS FOR QUANTIFYING VISUAL SHOWTHROUGH OF PRINTED IMAGES ON THE REVERSE OF PLANAR OBJECTS

WIPO Patent Application WO2004092874

A3

An image analysis method and apparatus (10) having an imaging assembly (12) and a processor (14) 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.

JPH0654799	[Name of invention] Pulp solution dilution zone control device
JPH0792084	DEVICE AND METHOD FOR MEASURING TRANSMISSIVITY OF OPTICAL SYSTEM
JPH10142141	INSTRUMENT FOR MEASURING WATER QUALITY

BROWNE RICHARD WALKER (US)
CANNING ROBERT V JR (US)
EVANS MICHAEL H (US)
JOHNSON ROBERT WILLIAM (US)
RUBIN BARRY (US)
STILWELL DOUGLAS RAY (US)

PCT/US2004/010710

September 15, 2005

April 07, 2004

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DU PONT (US)
BROWNE RICHARD WALKER (US)
CANNING ROBERT V JR (US)
EVANS MICHAEL H (US)
JOHNSON ROBERT WILLIAM (US)
RUBIN BARRY (US)
STILWELL DOUGLAS RAY (US)

G01N21/59; G01N21/86; (IPC1-7): G06K9/00; G01N21/00; G01N21/84

WO1998020326A1

1998-05-14

US6081612A	2000-06-27
US20040021869A1	2004-02-05
US5793486A	1998-08-11
US5082529A	1992-01-21
US3455637A	1969-07-15
US3827808A	1974-08-06

HO T. ET AL: "Applying Digital Image Technology to Pulpand Paper", CANADIAN CONFERENCE ON ELECTRICAL AND COMPUTER ENGINEERING, vol. 2, 14 September 1993 (1993-09-14) - 17 September 1993 (1993-09-17), pages 1139 - 1143, XP010118047

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