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弱纹理飞机蒙皮曲面图像特征匹配及拼接

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为了解决弱纹理飞机蒙皮特征点分布不均匀、正确匹配的特征点对较少的问题,提出了一种改进的LoFTR算法对飞机蒙皮图像进行拼接.根据相机位姿利用柱面反投影对蒙皮图像进行曲面校正;通过图像之间的重叠区域确定特征提取区域,从而减少错误匹配点对的生成;使用LoFTR算法进行特征提取,并且使用RANSAC算法对特征点进行筛选;根据图像分块的思想对重叠区域进行网格划分来对特征点进一步筛选,使得特征点分布更加均匀,得到更加准确的变换矩阵进行图像配准.实验在自研无人车采集的飞机蒙皮图像上进行了测试和验证,改进的方法与SIFT、SURF、ORB、BRISK以及AKAZE进行了特征匹配率比较实验,SIFT、SURF、ORB、BRISK和AKAZE匹配率分别为4.84％,0.47％、2.9％、0.86％、5.08％,提出的算法特征匹配率达到55.21％,SSIM平均值提高了44.38％～88.46％.该方法适用于对飞机蒙皮图像的拼接任务,且不存在因弱纹理而导致漏拼的问题.
Weak texture aircraft skin curved image feature matching and stitching
To address the issue of uneven distribution and insufficient correctly matched feature points in weakly-textured aircraft skin,an improved LoFTR algorithm is proposed for stitching aircraft skin images. Based on the posture of the camera,cylindrical back-projection is utilized to correct skin image curvature. By determining the feature extraction area through the overlapping regions between images,the generation of falsely matched point pairs is reduced. The LoFTR algorithm is employed for feature extraction,and the RANSAC algorithm is applied for feature point sorting. Adhering to the idea of image partitioning,grid division is used on overlapping areas for further sorting of feature points,ensuring a more even distribution,thereby yielding a more accurate transformation matrix for image registration. Experiments conducted on aircraft skin images collected via our self-developed unmanned vehicles confirmed the efficacy of this improved method. A feature matching rate comparison experiment with SIFT,SURF,ORB,BRISK,and AKAZE showed match rates of 4.84％,0.47％,2.9％,0.86％,and 5.08％,respectively,while the proposed algorithm achieved a feature match rate of 55.21％. The average SSIM increased by 44.38％ to 88.46％. The proposed method is effective for stitching tasks of aircraft skin images,and it eliminates the issue of missed stitches due to weak textures.

aircraft skinninganti-cylindrical projectionfeature maskfeature matchingimage stitchingweak textureimage segmentation

李炳超、王军、李海丰、王怀超、范龙飞

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中国民航大学计算机科学与技术学院 天津 300300

飞机蒙皮 反柱面投影 特征掩膜 特征匹配 图像拼接 弱纹理 图像分块

国家重点研发计划项目成都市"揭榜挂帅"科技项目天津市教委科研计划项目自然科学一般项目天津市教委科研计划项目自然科学一般项目中央高校基本科研业务费专项

2021YFB16005022021-JB00-00025-GX2021KJ0362022KJ0633122022PY13

2024

10.19651/j.cnki.emt.2315207

电子测量技术
北京无线电技术研究所

电子测量技术

CSTPCD北大核心
影响因子：1.166
ISSN：1002-7300
年,卷(期)：2024.47(5)
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