Image analysis – Applications – Manufacturing or product inspection
Reexamination Certificate
2005-12-09
2009-12-29
Seth, Manav (Department: 2624)
Image analysis
Applications
Manufacturing or product inspection
C356S445000
Reexamination Certificate
active
07639862
ABSTRACT:
An automated computer-controlled method and apparatus for measuring the quality or fineness of a pigment dispersion sample, comprising placing the pigment dispersion at the deep end of the tapered path of a Hegman gage block, placing the Hegman gage block in a holder in a motorized drawdown device that draws the scraper along the length of the tapered path at an angle and to at a contact pressure and at a controlled rate, thereby creating a tapered film sample of paint whose thickness tapers from a maximum thickness of 100 micrometers to a minimum thickness of zero. An illuminator assembly illuminates the sample with a substantially collimated light source at an intensity level and the light reflected from the sample is collected by a lens onto a photodetector array in a digital camera. After a time interval the camera acquires an image of the sample. The image is digitized and stored in a memory in the computer and then a portion of the image within a region of interest corresponding to the sample in the tapered path is analyzed to detect and count pigment agglomerates that protrude above the surface of the sample.
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CL2426 PCT International Search Report.
ASTM Standard D 1210-96—“Standard Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage”.
Canning, Jr. Robert Vincent
Mehr Scott Richard
Rubin Barry
Simpson, III Thomas William
Stilwell Douglas Ray
E.I. du Pont de Nemours and Company
Seth Manav
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