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目的在铁路货车故障轨边图像检测系统(TFDS)采集的车钩缓冲区域影像中,托架、车钩等关键部件是刚体,但部件之间的连接是软连接,存在相对位移,造成传统的全局校正模型在该类图像校正中无法实现高精度校正,本文基于动态时间归整(DTW)方法,提出一种基于DTW区域划分的影像校正方法,实现影像的高精度校正。方法本文将成像良好的车钩缓冲图像作为标准图像,首先对待校正图像进行预处理,消除标准图像与待校正图像之间在灰度、角度与尺度方面的差异,并针对车钩缓冲图像在车辆行进的垂直方向上偏移较小的特点,将2维图像校正问题转化为1维匹配问题,与待校正的车钩缓冲图像进行基于DTW的区域匹配,实现关键部件所在区域的区域划分,在对应的区域内分别进行校正,能够达到较高的校正精度。结果将传统的车钩缓冲图像校正方法与本文方法进行校正精度对比,经验证,本文方法的均方误差比传统校正方法小20个像元,并且本文方法成功实现了关键部件的区域划分,为后面的关键部件识别奠定了基础。结论经验证,本文校正方法适用于定向移动的复合刚体部件的区域校正,能够实现车钩缓冲图像中各个软连接部件的高精度校正,满足车钩缓冲图像校正的需要。
Objectives In the coupler-buffer image captured by TFDS, the key components such as bracket and coupler are rigid bodies, but the connections between components are soft-connected with relative displacement, resulting in the traditional global correction The model can not achieve high-precision correction in this type of image correction. In this paper, an image correction method based on DTW region division is proposed based on Dynamic Time Warping (DTW) method to realize high-precision image correction. Methods In this paper, a well-formed coupler-buffered image is taken as a standard image. Firstly, the image to be corrected is preprocessed to eliminate the differences in grayscale, angle and scale between the standard image and the image to be corrected. The vertical displacement of the smaller features, the two-dimensional image correction problem into a one-dimensional matching problem, and the to be corrected coupler image based DTW DTW-based region to achieve the key components of the region where the division in the corresponding region Respectively within the correction, to achieve a higher correction accuracy. Results Compared with the calibration accuracy of the proposed method, the mean square error of the proposed method is 20 pixels smaller than that of the traditional calibration method. The method of this paper has successfully implemented the key components’ The key components identification laid the foundation. Conclusion It is verified that the correction method proposed in this paper is suitable for the area correction of the moving rigid composite parts, which can realize the high precision correction of each soft connecting part in the coupler buffer image and meet the needs of the coupler buffer image correction.