超短基线多度重叠影像的水下交会精度分析

Spatial Accuracy Analysis of Ultra-short Baselines and Multiple Overlapping Images for Under Water Applications

摄影测量的处理工作主要依赖于自动的影像匹配技术,如果影像之间的辐射差异越小,即摄影基线越短,则自动匹配精度越高,但是从理论上说基线越短空间交会精度越低,而水下由于众多干扰因素影响,空间交会的精度更低。针对这一难题,从理论上分析了空间交会精度的主要影响因子,考虑涉水拍摄环境时水对光线的折射影响,提出将超短基线多度重叠影像应用于涉水摄影测量,并通过双介质空间交会实验和水下空间交会实验,验证了在涉水情况下,利用超短基线多度重叠影像能够大幅度地提高水下目标物的空间交会精度。得出的结论对越来越多的涉水摄影测量应用具有积极的参考价值。

The photogrammetric processing mainly relies on automatic image matching technology.If the image radiation differences are small,accurate automatic matching can be gained with the short photographic baselines.However,the spatial triangulation accuracy will be decreased.Accordingly,the underwater space triangulation accuracy is much lower due to many water related factors.In this paper,multiple overlapping images with ultra-short baselinesare presented to be applied forunderwater photogrammetry,which is based on spatial triangulation accuracy influences and light refraction between two mediums.The two mediums experiment and underwater experiment results show that multiple overlapping images with ultra-short baselines can greatly improve the the space triangulation accuracy of underwater targets.The obtained conclusions have important implications for more and more underwater photogrammetry applications.