截面线特征直接提取的离散曲率法

特征提取是逆向工程的重要步骤,其中截面线特征点的弱化是需要解决的关键问题.提出用离散曲率法提取特征点,曲率表达式包含了高斯核函数曲线,选用了合适的离散尺度因子.根据一阶和二阶离散曲率曲线的局部极值点,确定出截面线特征点集,进行特征点的融合,输出最终的截面线特征点集.通过与文献算法的输出进行比较,表明本算法提取的截面线特征点不容易有漏检和误检,能最大限度地与原有形状特征元保持一致.仿真输出实例证实了本算法的适用性和有效性.

Direct Feature Extraction of Sectional Curve Based on a Discrete Curvature Arithmetic

The process of feature points extracted is important in the reverse engineering, in which the crucial question about weak feature points extracted of sectional curve needs to be solved. The discrete curvature arithmetic was used to extract feature points, which the curva-ture expression contains Gaussian nuclear function and chooses appropriate discrete scale fac-tor. Based on the local extremum of one order and two orders discrete curvature, the feature points collection of sectional curve was determined and the feature points was fused. Then the final feature points collection was output. Compared with the feature point output of relevant literature, this method is not prone to slip and miss point features, and can guarantee the con-sistence between feature extraction results and original model feature element from the experi-ments. The applicability and validity of this arithmetic was validated through the results of em-ulation and output of an example.