Evaluation of the Viewpoint Shift for a Fisheye Lens Based on Stereo Geometry
Evaluation of the Viewpoint Shift for a Fisheye Lens Based on Stereo Geometry
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DOI：
10.1109/dicta.2016.7797038
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发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
N. Kita
中科院分区：
文献类型：
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作者：
N. Kita
许多研究开发了从鱼眼图像进行三维测量的方法。这些方法大多数都假设单视点模型。然而，鱼眼镜头的视点根据光轴与入射光线之间的入射角沿光轴移动。作者之前分析了使用单视点模型对鱼眼图像进行三维测量所产生的误差，并阐明在某些条件下该误差是不可忽略的。特别是立体测量的误差非常显着。这意味着可以从立体图像上的立体匹配坐标获得有关视点移动的一些知识。本文从一对坐标中获得了几个入射角的偏移幅度的有趣关系。此外，整合移动幅度的关系，为视点移动模型的校准提供重要提示。
Many studies have developed methods of making three-dimensional measurements from fisheye images. Most of these methods assume a single-viewpoint model. However, the viewpoint of a fisheye lens shifts along the optical axis according to the incident angle between the optical axis and the incident light ray. The author previously analyzed the error resulting from using the single-viewpoint model for three-dimensional measurements from fisheye images and clarified that the error is not negligible under some conditions. In particular, the errors in stereo measurements were remarkable. This implies that some knowledge about the viewpoint shift can be obtained from the stereo matching coordinates on stereo images. The present paper obtains an interesting relation of the shift magnitude at a couple of incident angles from a pair of coordinates. Moreover, the relations of shift magnitudes are integrated to obtain an important hint for the calibration of the viewpoint-shifting model.