Structureadaptive feature point matching for urban area wide-baseline images with viewpoint variation
Min Chen, Qing Xing Zhu, Haiqing He, Shaohua Yan, Yitao Zhao · DOAJ (DOAJ: Directory of Open Access Journals) · 2019
A feature point matching method based on structureadaptive feature is proposed for urban area wide-baseline images. Firstly, interest points and straight lines are detected from images. Structure adaptive feature region and descriptor are constructed by exploring the geometric relationship between the interest point and the straight lines located in the local neighborhood of the point, and initial matching results are obtained by using bi-directional matching strategy. Secondly, the fundamental matrix is estimated from the initial matching results. An epipolar geometry constrained structure adaptive feature matching method is proposed to match those features have not been matched in the initial matching step. Finally, a matching expansion method is proposed based on the previous matching results to improve the matching performance.The proposed matching method can generate similar feature regions and descriptors for corresponding features under significant image viewpoint variation benefiting from the proposed structure adaptive feature region construction method. The experimental results demonstrate that the proposed method provides significant improvements in correct matches number and matching precision compared with other traditional matching methods for urban area wide-baseline images (e.g. unmanned aerial vehicle images and oblique images) with viewpoint change and occlusion.