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

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...

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Bibliographische Detailangaben
Hauptverfasser:	EVANS, MICHAEL H, STILWELL, DOUGLAS RAY, BROWNE, RICHARD WALKER, CANNING, ROBERT V., JR, JOHNSON, ROBERT WILLIAM, RUBIN, BARRY
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	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 t wo 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.