title: Rectification control points selection method of triangle mesh in optical pressure measurement of wind-tunnel test.
abstract: In optical pressure measurement of wind-tunnel test, triangle mesh is usually built to rectify the images that are distorted in geometry. In this paper, a novel method of control points selection of triangle mesh is proposed by combining the artificial points and margin control points. For the problem that in the condition of wind the margin control point is difficult to extract due to model distortion and grey variation, an improved Smallest Univalue Segment Assimilating Nucleus algorithm based on region selection and adaptive threshold is designed. The connection method is employed to verify the availability of points, which avoids that the noisy points are mistakenly regarded as the angular points. The distorted images of aircraft model are rectified and the results are analyzed. Experiments demonstrate that the proposed method greatly improves the rectification effect.
authors.affiliation: School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
authors.forename: Chang
authors.initials: C
authors.lastname: Chen