STEEL-PIPE SURFACE INSPECTION METHOD, SURFACE INSPECTION DEVICE, MANUFACTURING SYSTEM, DEFECT GENERATION-LOCATION SPECIFYING METHOD, AND MANUFACTURING METHOD

WIPO Patent Application WO/2015/137200

A1

A control device (12) acquires a self-emission image of a steel pipe picked up when the steel pipe was hot, corrects circumferential direction uneven luminance of the self-emission image so that the luminance is uniform, and detects surface defects on the basis of the corrected self-emission image. It is preferable for the self-emission image to be picked up at a position at the rear surface of a reducer. It is preferable for a diameter reduction rate for the steel pipe, according to the reducer, to be at least 110%. Uneven luminance in the circumferential direction of the self-emission image is made uniform by using a circumferential direction luminance distribution in which the luminance in the length direction of the steel pipe is averaged. The uneven luminance in the circumferential direction of the self-emission image may be made uniform by using the differences in luminance among a plurality of self-emission images for which image pick up was performed with a position in the length direction of the steel pipe being changed.

JP5317683	Packaging container inspection method and packaging container inspection equipment
JP4097079	Defect inspection method and its equipment

IIZUKA YUKINORI (JP)
ONO HIROAKI (JP)
KODAMA TOSHIFUMI (JP)
OGAWA AKIHIRO (JP)

PCT/JP2015/056246

September 17, 2015

March 03, 2015

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JFE STEEL CORP (JP)

G01N25/72; G01J5/48

JP2012013509A	2012-01-19
JP2011000642A	2011-01-06

See also references of EP 3118612A4

SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)

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