[1] Zhu Yanjuan, Zhang Liyan, Zhou Laishui,. Contour extraction and curvature calculationfor fragment reassembly [J]. Journal of Southeast University (English Edition), 2004, 20 (2): 181-186. [doi:10.3969/j.issn.1003-7985.2004.02.011]
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Contour extraction and curvature calculationfor fragment reassembly(
)
碎片拼合的轮廓提取和曲率计算
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 20
- Issue:
- 2004 2
- Page:
- 181-186
- Research Field:
- Computer Science and Engineering
- Publishing date:
- 2004-06-30
Info
- Title:
- Contour extraction and curvature calculationfor fragment reassembly
- 碎片拼合的轮廓提取和曲率计算
- Author(s):
- Zhu Yanjuan, Zhang Liyan, Zhou Laishui
- Research Center of CAD/CAM Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
- PACS:
- TP391
- DOI:
- 10.3969/j.issn.1003-7985.2004.02.011
- Abstract:
- The Canny edge detector inevitably misses some important and obvious edges during contour extraction, which causes gaps in the contour. We propose a geometric method to locate, measure and fill the gaps precisely. With the complete contour information, we present a convolution approach, which utilizes an appropriate linear interpolation to resample the contour to calculate pointwise curvature. This approach distributes discrete points within a convolution window uniformly. It ensures a one-to-one correspondence between every point and its weight, thus the accuracy is guaranteed under this condition. A related parameter selection is also suggested. Experimental results show that the proposed methods are robust and accurate.
- Canny算子在对物体进行轮廓提取时, 会不可避免地漏检一些明显的边界, 导致轮廓的不连续. 提出了一种几何方法来定位、度量轮廓上的间断点, 然后将其准确地填充起来. 在获得轮廓的完整信息后, 文中提出采用卷积积分的方法, 通过线性插值对轮廓进行重采样来计算各离散点曲率. 该方法保证了卷积窗口内离散点分布得均匀、一致, 并且使得每一离散点与其权重都满足一一对应关系, 从而保证了曲率计算的精确性. 同时给出了相关参数的选择方法. 实验结果表明, 算法是准确和稳定可靠的.
References:
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Memo
- Memo:
- Biographies: Zhu Yanjuan(1970—), female, graduate; Zhang Liyan(corresponding author), female, doctor, professor, zhangly@nuaa.edu.cn.