Method for detection of defects lacking distinct edges

Details Method for detection of defects lacking distinct edges Method for detection of defects lacking distinct edges

1992-06-08

1993-04-20

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 51, 53 55, 358106, G06K 900

Patent

active

052049108

ABSTRACT:
A method of image processing for visually inspecting a workpiece. The method compares the brightness (15) at each location within an image of the workpiece to the equivalent location within an image of an idealized workpiece. The inspection depends only on local brightness differences between the two images. The method can detect defects which have no distinct edges. Finally this method can detect defects which are small enough that the resolution of the image will show these small defects only as a single point of light (12) or dark (27).

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patent: 4760444 (1988-07-01), Nielson et al.
patent: 4791586 (1988-12-01), Maeda et al.
patent: 4926489 (1990-05-01), Danielson et al.
patent: 5023916 (1991-06-01), Breu

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