Research On 4-axis 3D Lasers Measurement System And Automatic Registration Technology

Reverse Engineering (RE) is an intersection of many research forelands and a sophisticated system engineering which integrate many advanced theories and technologies such as computer vision, computer measurement, control theory, digital image processing, CAD/CAM, and sensors. Reverse engineering is an important component of the modern advanced manufacturing technology; it plays a significant role in attracting domestic and foreign advanced manufacturing technology, cutting the product development cycle and reducing the cost of production.In this paper, a line scanning 4-axis Measurement System PowerRE-IB is designed and developed on the basis of the 3D laser scanning measurement system PowerRE-IA. It makes the measurement system from 3-axis to 4-axis and realizes the automatic registration of measurement data. The quality and quantity of 3D data points has a direct impact on the follow-up modeling effectiveness and efficiency, therefore it has great significance to research automatic data registration technology. In this paper, we have an in-depth and meticulous research on the calibration of rotary table, rotation scan and piece and automatic data registration technology in reverse engineering.The hardware of control system is analyzed and chosen, the motion controller programming is in key research and the rotating measuring system software packages is developed on basis of this.For the calibration of rotary table, the calibration principle is discussed, two calibration blocks are designed and three calibration methods are discussed and analyzed. Finally, a simplified rotation calibration program is proposed, which only needs a standard ball. More calibration points can be obtained by the rotary table driving the standard ball and the moving of Z-axis.For the rotating registration, the principle of rotating registration is discussed; two rotary scanning methods, pure rotating scan and mixed rotating scan are researched.For the problem of the method of Iterative Closet Point is difficult to search corresponding points, a method using points cloud curvature to confirm corresponding points is proposed. It calculates the curvature and vector of coincidence region firstly, and then automatic data registration is realized by using the curvature and vector to search corresponding points.