Three-dimensional measurement system using a CCD sensor and a laser scanner

A new active mode technique for the measurement of 3D objects was developed using a CCD line sensor and a galvanomirror scanner. The CCD line sensor is placed in parallel to the laser light scanning plane. When a series of equally spaced laser light spots is projected on to a surface, the spot density on the surface is altered depending on the shape of the surface. By measuring the displacement of a light spot the distance between the camera and the object can be determined using trigonometry. During the measurements, laser light was vertically scanned and object was horizontally moved. The measurement error for an object of 1 m apart from the camera is 0.08 percent in scanning direction and 0.2 percent in object-height direction. A modified experiment also was performed for the purpose of shape recognition of a given object. The success of this experiment is demonstrated by using objects of rectangular, triangular and round shapes.