基于动态小窗Hough变换法的焊缝特征直线提取

Extracting weld seam by Hough transform based on dynamic windows

根据焊缝跟踪过程中前后系列图像的相似性,以相邻的前一幅图得到的3个角点坐标,对当前图像进行动态开小窗,而Hough变换参数空间的θ值范围则依据前一幅图的θ0值来确定,然后对每幅小窗图像进行Hough变换.动态开窗和限定Hough变换参数空间的θ值范围,可明显加快搜索有效像素点的速度和减少Hough变换的计算量.结果表明,基于动态小窗的Hough变换大大提高了运算速度、算法的稳定性,以及直线拟合的精度,满足焊缝跟踪的实时性要求.

Based on the similarity of the former and later image in the seam tracking process and the coordinates of the previous pictures' three characteristic points,dynamic region of interested can be extracted from the current image.And the range of Hough transform parameter space's θ parameter is determined by the value of θ0 parameter of the previous image and then each piece of dynamic image of region of interested is processed by Hough transform.The dynamic window and limiting Hough transform parameter space's θ range can significantly speed up the search for an effective pixel and reduce the Hough transform calculation.Experiments indicate that this method can greatly increased computational speed and algorithm stability and accuracy of fitted straight line,and meet the requirements of real-time seam tracking.