载荷摆运动参数测量的射影校正法
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TH215 P235. 2

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国家自然科学基金(41561082)项目资助


Measurement of the kinematic parameters of payload swing using projective correction
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    摘要:

    精确测量载荷摆运动参数对起重运输的消摆控制至关重要。 但现有单幅图像射影校正测量法因易受背景等因素干扰, 导致共面直线约束提取难度增加,从而影响测量精度。 为此,提出一种时序图像动态直线约束的射影校正法。 首先,从特定时 序图像中提取动态直线,并通过改进随机样本一致算法聚类,以确立直线约束;其次,根据直线约束采用列文伯格-马夸尔特 (LM)迭代法估计灭点和绝对二次曲线,计算校正矩阵;最后,利用校正矩阵对标记点坐标进行校正,并推算摆角和小车速度。 试验结果表明,本文方法较惯性测量单元测角的均方根误差为 0. 124 7°,较设置小车速度的均方根误差为 0. 003 6 m/ s;同时, 与逆透视校正法、单幅图像共面直线约束和非共面直线约束的射影校正法相比,测角精度分别提高 69. 05% 、76. 35% 和 93. 91% ,测速精度分别提高 42. 85% 、47. 06% 和 59. 55% ,表明方法可有效提高载荷摆运动参数测量精度。

    Abstract:

    Accurate measurement of the kinematic parameters of payload swing is crucial for lifting and transporting dissipative swing control. However, the existing single-image projective correction methods are susceptible to the interference of background and other factors. It is difficult to automatically extract the coplanar straight-line constraints, thus restricting the measurement accuracy. To address this problem, a projective rectification method is proposed that utilizes dynamic line constraints from temporal image sequences. Firstly, dynamic straight lines are extracted from specific temporal images through the integration of background differencing and color thresholding methods. Subsequently, clustering is performed using an improved random sample consensus algorithm, thereby establishing reliable constraint conditions. Secondly, the Levenberg-Marquardt iterative method is used to estimate the vanishing point and the absolute quadratic curve based on the linear constraints. Then, the correction matrix was calculated. Thirdly, the coordinates of the marker points are rectified, which are employed to calculate the swing angle and trolley speed. In the measurement of kinematic parameters of the payload swing, the aforementioned method achieves a root mean square error of 0. 124 7° in comparison with angle measurement by the inertial measurement unit, and a root mean square error of 0. 003 6 m/ s in comparison with the set trolley speed. Compared with the inverse perspective correction method, the projective correction method with coplanar linear constraints and noncoplanar linear constraints, the angular accuracy is improved by 69. 05% , 76. 35% , and 93. 91% , and the velocity accuracy is improved by 42. 85% , 47. 06% , and 59. 55% , respectively. The proposed method utilizes the swing string in the payload swing as constraint for projective rectification, aiming to obtain richer and more precise constraint conditions, thereby enabling superior measurement precision of kinematic parameters in the payload swing.

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何 烽,李佳田,阿晓荟,刘佳音.载荷摆运动参数测量的射影校正法[J].仪器仪表学报,2024,45(10):178-187

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  • 在线发布日期: 2025-01-03
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