| 冰形表面激光光带中心线快速提取方法 |
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| 引用本文： | 康含玉,刘桂华,王斌,牛乾.冰形表面激光光带中心线快速提取方法[J].实验流体力学,2017,31(5):81-87. |
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| 作者姓名： | 康含玉 刘桂华 王斌 牛乾 |
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| 作者单位： | 1.西南科技大学 信息工程学院, 四川 绵阳 621000 |
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| 基金项目： | 国家自然科学基金11602292四川省科技厅科技支撑项目2016GZ0183 |
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| 摘 要： | 在风洞结冰模型3D冰形测量中，激光三角测量法相对传统测量方法检测速度快、精确度高，具有极高研究价值。然而由于冰体对激光透射严重，影响激光中心线提取精度从而影响测量精度。针对此问题，提出一种冰形表面激光光带中心线快速提取方法。该算法具体实现步骤为:首先，采用基于三维块匹配去噪算法对图像进行降噪，并对图像进行视觉显著性计算，分割出光带区域；其次，求取梯度图并转换至频域空间，根据图像频谱特征求取能量中心区域；最后，对区域采用灰度重心法求取中心线亚像素级位置。采用冰箱冻结的半径已知圆柱冰块评估该算法，测得算法处理时效为28.57FPS，使用该算法的冰形轮廓重建精度达到0.017mm。实验证明算法满足冰形在线测量技术要求，为开展结冰实验中结冰生长过程在线三维检测技术奠定技术基础。
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| 关 键 词： | 结冰模型 图像处理 显著图 中心线提取 频域变换 |
| 收稿时间： | 2017-05-10 |
A fast method of extracting the laser light bar's centerline in the ice model |
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| Affiliation: | 1.School of Information Engineering, University of Southwest Science and Technology, Mianyang Sichuan 621000, China2.Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China3.State Key Loboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China |
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| Abstract: | The laser centerline extraction is an important step in the measurement of the ice cross sectional profile, and the extraction accuracy directly affects the accuracy of the measurement system. Especially the ice on the structural light transmission is serious, the center line extraction algorithm is put forward a higher requirement. A fast centerline extraction method based on frequency domain transform is proposed to extract the center line in the three-dimensional measurement of ice. First, the image is subjected to noise reduction based on the technique of Block-matching and 3D filtering. Second, in order to reduce the computational complexity, the visual significance of the image is calculated by using the quaternion Fourier transform of phase spectrum, and then extract the optical band's region. Third, obtain the gradient map and convert to the frequency domain space, according to the image spectrum characteristics, we can obtain the center line position. The experimental results show that the algorithm is 28.57FPS, and the accuracy of ice contour reconstruction is 0.017mm. |
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