外文翻譯---ccd雙目立體視覺(jué)測(cè)量系統(tǒng)的理論研究-其他專(zhuān)業(yè)-資料下載頁(yè)
2025-01-19 09:15本頁(yè)面
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【正文】 ertain object point within the coordinate origin with the world average measurement error and the two cameras and two camera angle 2α between the distance between the L map. It can be seen, when a certain distance between the two cameras, the average error with the increase of 2α, when the angle between the two cameras is fixed, the average error increases with the distance increasing. Figure 6 Average error and the angle between two axes, the distance between the two cameras chart Overall, structural parameters and precision of the system is a more plex function can be summarized as follows: 1) Spacing between the camera and the measurement error is directly proportional to the smaller distance, the smaller the error。2) When the camera is not greater than the angle between the 130 176。, the measurement error is small, whereas larger. Has high credibility. 3. 2 Structural parameters on the accuracy of camera calibration In practice, the need to create two links between CCD coordinates, which need to be twodimensional CCD calibration, in order to obtain the rotation between the two CCD matrix and translation matrix. Proved the precision of camera calibration parameters and system structure also has a very close relationship. Calibration method uses a template based on singleplane calibration strategy, the accuracy was assessed using an assessment based on the length of the checkerboard method. The method also can be used as measurement error of the measurement method. Calibration template of 10 to 50 mm length of the checkerboard was repeated experimental results shown in Table 1. Table 1 Structure parameters on the average error of calibration. As can be seen from Table 1, when the camera a certain distance, the calibration error increases with the optical axis angle increasing when the angle between the fixed axis, the camera calibration error with increasing distance increases. Experimental results demonstrate that when the distance between the two cameras is not more than 500mm, twoaxis angle of not more than 60 176。, the calibration error is small. 4 Conclusion Integrated system parameters on the measurement accuracy and precision of calibration, stereo vision system in the establishment of the two camera optical axis angle and distance between the two cameras should be as small as possible, but in practice, taking into account the ease of visual target feature point matching , especially for largescale realtime moving object tracking, a target is obscured happens, the angle between the two camera optical axis should be chosen between 30 176。 ~ 60 176。. In addition, the target feature point image recognition accuracy to achieve subpixel accuracy as possible, try to avoid the loss of good as a mile phenomenon. According to the above set up a stereo vision system is derived, and achieved good experimental results show that the conclusions of this paper has great practical significance, for further indepth study has laid a solid foundation.
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