シート状物のくぼみ検出方法及びシート状物のくぼみ検出装置

Method and apparatus for detecting recess of sheet-like article

Abstract

PROBLEM TO BE SOLVED: To accurately detect only the recess of a sheet-like article having a flow pattern such as artificial marble without altering the disposition, measuring conditions of an inspecting apparatus one by one even if the article is vibrated in horizontal or upward or downward (vertical) direction during inspection. SOLUTION: The sheet-like article to be fed in upward and downward moving range L is illuminated by the line-like illuminating unit 3 of an incident angle (45<=α<=70 deg.) and an illumination width W (W>=L sin 2α/cos α). The regularly reflected light is received by a line sensor 4, and hence even if the inspection surface is moved upward or downward, a stable shade is formed at the recess to obtain an output having clear change. The output signal is differentiated to accurately detect only the recess, the differentiated signal is binarized, subjected to a run length coding, and then connectively processed while expanding it with a predetermined value, thereby accurately discriminating the edge or recess separated from the image.
(57)【要約】 【課題】 人工大理石などの流れ模様を有するシート状 物が、検査中に水平方向や上下(垂直)方向に振動して も検査装置の配置、測定条件などを一々変更せずに、く ぼみのみを精度良く検出する。 【解決手段】 上下動範囲(L)で走行するシート状物 を、入射角(45≦α≦70゜)、照明幅W(W≧Ls in2α/cosα)のライン状照明装置で照明し、そ の正反射光を、ラインセンサで受光することで、検査面 の上下動があっても、くぼみ部分で安定して影を作り、 明確な変化を有する出力を得る。また、この出力信号を 微分処理してくぼみのみを正確に検出し、かつ微分処理 された信号を2値化し、ランレングス符号化を行い、そ の後所定の値で膨張処理しながら連結性処理を行うこと で、エッジ部分の分離した画像を正確にエッジかくぼみ かを判定する。

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    JP-2012202839-AOctober 22, 2012Dainippon Screen Mfg Co Ltd, 大日本スクリーン製造株式会社Image acquisition device for irregularity inspection, irregularity inspection device, and position determination method for irradiation part