Title:
METHOD OF MEASURING FLATNESS OF PLATE AND METHOD OF MANUFACTURING STEEL PLATE USING SAME
Document Type and Number:
WIPO Patent Application WO/2011/048860
Kind Code:
A1
Abstract:
Disclosed is a method of accurately measuring the surface shape and the flatness of a plate even when an image capturing means is disposed at a position where the means can receive specularly reflected light of a light and dark pattern projected onto a surface of a plate with a high specular reflectivity. In the method, a staggered pattern in which light portions with predetermined set pitches are arranged in the longitudinal direction and in the transverse direction in a staggered manner is used as a light and dark pattern to be projected onto the surface of the plate. A shape measurement line extending along the longitudinal direction of the staggered pattern is set in a pattern image acquired by the image capturing means, and concentrations of pixels located on straight lines that extend in the transverse direction of the staggered pattern while passing through pixels on the shape measurement line and that have a length twice or more the set pitch of the light portions in the transverse direction are averaged so that average pixel concentrations are calculated. The surface shape of the plate is calculated on the basis of the average pixel concentration distribution along the shape measurement line, and the flatness of the plate is calculated on the basis of the calculated surface shape.
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Inventors:
ISEI Yoshito (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
KATO Tomoya (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
KATO Tomoya (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
Application Number:
JP2010/063068
Publication Date:
April 28, 2011
Filing Date:
August 03, 2010
Export Citation:
Assignee:
Sumitomo Metal Industries, Ltd. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
ISEI Yoshito (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
ISEI Yoshito (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
International Classes:
G01B11/30; B21C51/00
Attorney, Agent or Firm:
OHNAKA Minoru (Daiichijuken Nagahoribashi-ekimae bldg. 4F, 3-6 Minamisemba 2-chome, Chuo-ku, Osaka-sh, Osaka 81, 〒5420081, JP)
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