Study on 3-Dimensional Edge Profile Measurement for Free Form Surface. (1st Report). Automatic Edge Detection by means of Optical Ring Images.

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  • 自由曲面形状の３次元エッジプロファイル計測に関する研究　（第１報）　　光リング画像によるエッジ自動検出
  • ジユウ キョクメン ケイジョウ ノ 3ジゲン エッジプロファイル ケイソク ニ カンスル ケンキュウ ダイ1ポウ ヒカリ リング ガゾウ ニ ヨル エッジ ジドウ ケンシュツ
  • Automatic Edge Detection by means of Optical Ring Images
  • 光リング画像によるエッジ自由検出

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Abstract

This paper describes development of an efficient measuring method of 3-dimensional edge profile with high accuracy for free form surface. A new method is proposed for measurement of 3-D edge profile by means of optical ring images. 3-D profile sensor based on optical ring images has more advantage than the others because it detects as not a light spot but a ring image of the reflected light from a target point. The changes of optical ring image intensity occur in the edge. The differences between the intensities of ring images in the ordinary plane and the edge are represented by cross correlation coefficient, which is used as measuring parameter to detect the 3-D edge profile of a master model. In automatic experiments, first the characteristic area which may include the edge is extracted by rough measurement, second the measuring path of the sensor adapted to the edge profile is decided in the characteristic area. Finally, the edge positions are detected by using the cross correlation coefficients obtained by fine measurement along the measuring path and the 3-D edge profiles are estimated.

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