Image analysis – Histogram processing – For setting a threshold
Patent
1991-01-11
1993-01-26
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
358101, 358106, 378 58, G06K 900, G01N 2302
Patent
active
051827751
ABSTRACT:
A radiographic test is conducted on a welded portion of a pipe or the like to form a radiographic image, which is introduced into a computer. Volumetric defects and planar defects in the radiographic image are emphasized and extracted by separate methods to obtain a volumetric candidate defect image and a planar candidate defect image. The candidate defect images are then combined to form a single image in which defects can be easily identified. Features of defects in the images are measured, and a set of interference rules is applied to the measured features. Each inference rule gives a degree of certainty that a defect is of a certain type. The degrees of certainty determined by a plurality of the rules are collated to obtain a total degree of certainty, and the type of a defect is inferred from the total degree of certainty.
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Davies et al., "Discontinuous Registration of Industrial Radiographs Using Profile Analysis and Piecewise Correlation Techniques," May/Jun. 1990, pp. 425-432.
Koshimizu et al., "Weld Inspection Expert System With Image Processing Environment", 1989, pp. 51-56.
Inoue et al., "Automatic Recognition of Weld Defects in Radiographic Test (Report 1)", vol. 11, No. 2, 1982, pp. 123-132.
Harada Tetsuzo
Itoga Kouyu
Iuchi Sadao
Matsui Shigetomo
Michiba Kouji
Boudreau Leo H.
Johns Andrew W.
Kawasaki Jukogyo Kabushiki Kaisha
The Chubu Electric Power Co., Inc.
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