Noncontact 3-dimensional measurement using He-Ne laser and CCD camera

He-Ne 레이저와 CCD 카메라를 이용한 비접촉 3차원 측정

Kim, Bong-chae;Jeon, Byung-cheol;Kim, Jae-do

  • Published : 1997.11.01


A fast and precise technique to measure 3-dimensional coordinates of an object is proposed. It is essential to take the 3-dimensional measurements of the object in design and inspection. Using this developed system a surface model of a complex shape can be constructed. 3-dimensional world coordinates are projected onto a camera plane by the perspective transformation, which plays an important role in this measurement system. According to the shape of the object two measuring methods are proposed. One is rotation of an object and the other is translation of measuring unit. Measuring speed depending on image processing time is obtained as 200 points per second. Measurement resolution i sexperimented by two parameters among others; the angle between the laser beam plane and the camera, and the distance between the camera and the object. As a result of these experiments, it was found that measurement resolution ranges from 0.3mm to 1.0mm. This constructed surface model could be used in manufacturing tools such as rapid prototyping machine.


Noncontact 3-dimensional Measurement;Laser Slit Beam;Reflection Measurement Method;CCD Camera;Surface Modeling