한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)
- 제16권10호
- /
- Pages.80-86
- /
- 1999
- /
- 1225-9071(pISSN)
- /
- 2287-8769(eISSN)
소형(1mm이하) hole의 형태 및 크기 측정을 위한 자동초점 비젼검사기
Automatic Focusing Vision System for Inspection of Size and Shape of Small Hole
초록
Since the quality of the coated wires is in various applications dependant on the coating depth, accuracy of hole size of dies used for coating wires must be maintained precisely, in general within one micron. This paper proposes a new vision system which measures automatically the size and shape of small holes having diameters less than 1mm within an error limit of 1 micron. To quickly obtain the focused image, this paper proposes an estimation method of the camera position using only a couple of defocused hole images. It measures the distributions of light intensity around the image boundary and decides the direction and distance of a camera motion. The proposed system measures the size, shape distortion, inclination of the hole against the axis of the dies structure, to decides the acceptability of the dies for use. The proposed algorithm has been implemented using a cheap 640