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Body of three-dimensional visual inspection system

Sensors are in their own coordinate system (sensor local coordinate system) were measured in order to achieve system function, which is the global calibration, global calibration diagram in Figure 5. Figure 5 Principle of the global standards system the most direct technique is the so-called global alignment calibration of the gold rules. In the calibration system, and the measured object to make a fully consistent gold standard rules (such as the measured body), the standard rules on the distribution of gold control points, which correspond to the measured points tested vehicle body, the control point in the golden rules the position reference coordinate system is strictly known. Calibration, sensor control point, by controlling the location coordinates of the sensor local coordinate system can be regulated to the reference coordinate system of gold uniform. Golden rules explicitly direct calibration method, but there are significant practical application defects, such as gold and the measured object should be the same rules, different models require different detection systems such as the golden rules. In addition, the production of high precision,[link widoczny dla zalogowanych], such as body size of the golden rules, high costs,[link widoczny dla zalogowanych], for some larger body, in fact almost impossible. Golden rules in view of the above-mentioned shortcomings of the calibration, the current visual inspection system used in the body is through the middle of the indirect global coordinate measuring device calibration standards, principles, shown in Figure 6. The core of the calibration technique is composed of two mobile high-precision theodolite space coordinate measuring device and a precision standard target. Global calibration, the first target placed in the sensor measurement space and fixed, with the sensor target (target on the design of a standard round hole), by the sensor coordinate system and the target coordinates relations; second, while with the theodolite coordinate measuring device observation target in space position, get target coordinates and theodolite measuring device coordinate system, the question of relations; again, with the theodolite coordinate measurement device observing the visual inspection system reference systems, are the relationships between them; Finally, the coordinate transformation chain: the sensor coordinate system coordinates of a target coordinate measuring device of a theodolite coordinate system of a reference coordinate system, the sensor coordinate system to reference coordinate system of the visual system, the unification question, the global calibration. Compared with the gold rules calibration, based on the safety of theodolite calibration of coordinate measuring device has obvious advantages, versatility, low cost, and can be used in different sizes (different models) of the body visual inspection system. Of particular note is that if the visual system based on stereo vision sensor uses a unified structure, the theodolite coordinate measurement device based on the global calibration more prominent advantages, different visual inspection system can use the same target and calibration software, which the formation and maintenance of the system with great convenience, which is promoting a wide range of visual detection technology is very beneficial. 4 Department of System Control Huo indirect global calibration in Figure 6 Schematic three-dimensional visual inspection body system is based on large-scale computer-controlled system, the system generally contains dozens of sensors, sensor control performance of the system has important implications. The early use of the star sensor control line connection scheme shown in Figure 7. Each sensor control line and video lines are connected to separate control cabinet, namely,[link widoczny dla zalogowanych], through the valve by the distribution of computer I / O ports, respectively, control sensor, the sensor output video signal by the control cabinet backward people switching image acquisition card, and then handled by the computer . Leopard V ///// 2 \- Figure 7 for a IIl video lJl line connected with the star sensor control body for the visual inspection of large systems, there are less than the control scheme: ① complex wiring, cable demand, the hidden dangers of the system more stable work ; ② system does not have good flexibility, scalability is poor, that is, when a sensor 20 extend the existing system to 30 sensors, you must re-design the control cabinet and wiring. The latest visual detection system uses a field bus control program, completely solve the above problem, the principle shown in Figure 8. The expansion of its program with excellent performance, can not change the existing system architecture, based on the smooth expansion of the system, and cabling specifications, cable demand for small, low security risk,[link widoczny dla zalogowanych], easy to maintain. Currently, the system uses RS-485 repeater cases, can extend more than 128 sensors. 5 Figure 8 sensor measurement software control principle of the bus body three-dimensional visual inspection system management of hardware quantity, type of complex system functions to ensure the reliability and accuracy to meet the design, there must be a powerful measurement software support. Measuring software design must consider the following points: ① Select the operating system and high reliability. Visual inspection of the image processing-based, involving a large number of algorithms and (continued on page 4 Cool

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