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A novel method to extract conic blending feature in reverse engineering is presented. Different from the methods to recover constant and variable radius blends from unorganized points,it contains not only novel segmentation and feature recognition techniques,but also bias corrected technique to capture more reliable distribution of feature parameters along the spine curve.The segmentation depending on point classification separates the points in the conic blend region from the input point cloud.The available feature parameters of the cross-sectional curves are extracted with the processes of slicing point clouds with planes,conic curve fitting,and parameters estimation and compensation.The extracted parameters and its distribution laws are refined according to statistic theory such as regression analysis and hypothesis test.The proposed method can accurately capture the original design intentions and conveniently guide the reverse modeling process.Application examples are presented to verify the high precision and stability of the proposed method.
A novel method to extract conic blending feature in reverse engineering is presented. Different from the methods to recover constant and variable radius blends from unorganized points, it contains not only novel segmentation and feature recognition techniques, but also bias corrected technique to capture more reliable distribution of feature parameters along the spine curve. The way depending on point classification separates the points in the conic blend region from the input point cloud. The available feature parameters of the cross-sectional curves are extracted with the processes of slicing point clouds with planes, conic curve fitting, and parameters estimation and compensation. The extracted parameters and its distribution laws are refined according to statistic theory such as regression analysis and hypothesis test. The proposed method can accurately capture the original design intentions and conveniently guide the reverse modeling process. Application examples are presented to verify the high precision and stability of the proposed method.