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基于Hough变换原理的海冰厚度识别方法

张培宣 陈晓东 孔帅 季少鹏 季顺迎

张培宣,陈晓东,孔帅,等. 基于Hough变换原理的海冰厚度识别方法[J]. 海洋学报,2022,44(7):108–116 doi: 10.12284/hyxb2022114
引用本文: 张培宣,陈晓东,孔帅,等. 基于Hough变换原理的海冰厚度识别方法[J]. 海洋学报,2022,44(7):108–116 doi: 10.12284/hyxb2022114
Zhang Peixuan,Chen Xiaodong,Kong Shuai, et al. Research on sea ice thickness identification method based on Hough transform principle[J]. Haiyang Xuebao,2022, 44(7):108–116 doi: 10.12284/hyxb2022114
Citation: Zhang Peixuan,Chen Xiaodong,Kong Shuai, et al. Research on sea ice thickness identification method based on Hough transform principle[J]. Haiyang Xuebao,2022, 44(7):108–116 doi: 10.12284/hyxb2022114

基于Hough变换原理的海冰厚度识别方法

doi: 10.12284/hyxb2022114
基金项目: 国家重点研发计划重点专项(2018YFA0605902);国家自然科学基金(42176241,52101300,12102083);中央高校基本科研业务费(DUT21LK03);水动力学重点实验室稳定支持基金;国家级大学生创新创业训练计划支持项目(20211014110061)。
详细信息
    作者简介:

    张培宣(2000-),男,河北省邢台市人,主要从事计算机图形学研究。E-mail: hbxtzpx@mail.dlut.edu.cn

    通讯作者:

    陈晓东(1987-),男,辽宁省抚顺市人,博士,工程师,主要从事海冰力学及极地海洋工程研究。E-mail: chenxiaodong@dlut.edu.cn

  • 中图分类号: O343.3;P751

Research on sea ice thickness identification method based on Hough transform principle

  • 摘要: 作为主要海冰参数之一的海冰厚度对海冰灾害评估和极地船舶与冰区海洋工程结构设计具有重要意义。采用船侧视频图像对海冰厚度进行自动识别是提取海冰参数的重要方式。本文采用基于Hough变换的机器视觉方法对海冰翻转过程中的表面轮廓线进行识别,从而自动获取海冰厚度参数。根据海冰图像特征制定了图像边缘识别−近似线段识别−海冰轮廓线段组识别的计算流程。在线段组识别过程中,根据海冰的几何特征建立了由夹角、长度及间距参数相关联的3个识别参数所组成的判断条件。为验证方法的可靠性,将该方法用于“雪龙”号第八次北极科考的走航实测数据中,结果表明,3个识别参数均具有最优阈值。当低于最优值时提高阈值可增加有效识别率;而高于最优值时提高阈值则会导致误判率增大,采用最优阈值可使冰厚识别率达到90%以上。因此,采用基于Hough变换的冰厚识别方法可实现对海冰厚度的实时监测。
  • 图  1  “雪龙”号科考船北极航行中的冰厚测量示例[29]

    Fig.  1  Example of ice thickness measurement during the Arctic voyage of Xuelong scientific research ship[29]

    图  2  边缘线段识别结果

    a. 坐标系变换的演示图;b. 极坐标空间的Hough变换

    Fig.  2  Recognition result of edge segment

    a. Schematic diagram of coordinate transform; b. Hough transform in polar coordinate space

    图  3  边缘线段识别结果

    所识别线段用不同颜色标出

    Fig.  3  Recognition result of edge segment

    The identified lines segment are marked with different colors

    图  4  边缘线段组错误判断示例

    a. 两线间夹角差值过大;b. 两线间长度差值过大;c. 两线间夹角差值过大

    Fig.  4  Error judgment example of edge segment group

    a. Excessive angle difference between two lines; b. excessive length difference between two lines; c. excessive angle difference between two lines

    图  5  两直线相交原理分析

    Fig.  5  Principle analysis of intersection of two straight lines

    图  6  基于Hough变换的海冰厚度识别

    所识别线段用不同颜色标出

    Fig.  6  Identifications of sea ice thickness based on Hough transformation

    The identified lines segment are marked with different colors

    图  7  基于Hough变换的海冰厚度识别

    所识别线段用不同颜色标出

    Fig.  7  Identifications of sea ice thickness based on Hough transformation

    The identified lines segment are marked with different colors

    图  8  夹角阈值试验曲线

    Fig.  8  Experimental curve of angle threshold

    图  9  长度阈值试验曲线

    Fig.  9  Experimental curve of length threshold

    图  10  间距阈值试验曲线

    Fig.  10  Experimental curve of distance threshold

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