| 敬明洋,赵延明,王 亮,刘晓进.基于改进 Zernike 矩的海洋绞车排缆间隙亚像素检测方法[J].电子测量与仪器学报,2023,37(11):225-235 |
| 基于改进 Zernike 矩的海洋绞车排缆间隙亚像素检测方法 |
| Sub-pixel measurement method for marine winch cable arrangement clearance based on improved Zernike moment |
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| DOI： |
| 中文关键词: 海洋绞车 排缆间隙 视觉检测 改进 Zernike 矩 亚像素测量 |
| 英文关键词:School of Information and Electrical Engineering,Hunan University of Science and Technology |
| 基金项目:湖南省教育厅重点科研项目(119A183)、湖南省研究生科研创新项目(CX20221056)资助 |
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| 中文摘要: |
| 针对海洋绞车现有排缆方式易受环境干扰、接触摩擦磨损影响排缆精度问题,采用非接触式视觉检测直接表征排缆质
量的排缆间隙的排缆方式,提出了一种基于改进 Zernike 矩的海洋绞车排缆间隙亚像素测量方法。 首先将二维图像梯度信息垂
直投影为一维波形,提出基于 Scharr 梯度信息的垂直投影排缆间隙定位方法,快速定位间隙区域;然后通过主梯度方向插值改
进 Zernike 矩的亚像素边缘检测,提高亚像素边缘检测精度;最后采用基于 DBSCAN 的最小二乘曲线拟合方法实现多条不相交
曲线拟合,实现排缆间隙大小测量。 实验结果表明,本文方法相比于拟合法、插值法、传统 Zernike 矩法亚像素检测具有较高的
准确度和测量精度,排缆间隙测量误差在 0. 1 mm 内,相对误差可达 8. 60%以内,为有效实现精准排缆提供前提保证。 |
| 英文摘要: |
| Aiming at the problem that the cable arrangement accuracy of the current cable arrangement methods for ocean winch is easily
affected by environmental interference and contact friction and wear, the cable arrangement method is used by the non-contact visual
detection method to measure the cable arrangement clearance which directly characterize the quality of the cable arrangement, and a subpixel measurement method for marine winch cable arrangement clearance based on improved Zernike moments is proposed in the paper.
Firstly, the two-dimensional image gradient information is vertically projected into the one-dimensional waveform, and a vertical
projection cable arrangement clearance location method based on Scharr gradient information is proposed to quickly locate the clearance
area. Secondly, an improved sub-pixel edge detection method based on Zernike moments is developed by the main gradient direction
interpolation to enhance the sub-pixel edge detection accuracy. Finally, a least-squares curve fitting method based on DBSCAN is used to
fit multiple non-intersecting curves for measuring the cable arrangement clearance size. Experimental results show that the proposed
method has higher accuracy and measurement precision by comparing with sub-pixel detection methods based on fitting method,
interpolation method, and traditional Zernike moment, its measurement error is less than 0. 1 mm and relative error is less than 8. 60%,
which provides a prerequisite guarantee for achieving accurate cable arrangement. |
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