光电工程, 2012, 39 (2): 48, 网络出版: 2012-02-20
超短焦全景鱼眼镜头的研究与设计
Research and Design of Super Short-focus Panoramic Fish-eye Lens
摘要
着重分析了超短焦鱼眼镜头焦距与分辨率的关系,表明了像面尺寸一定的前提下焦距越短,全景展开的环景边缘分辨率越高。基于以上理念,依据超短焦全景镜头设计思路,设计了一款焦距像高比≤0.35,水平视场角 =360°,垂直视场角 ≥180°的全景鱼眼镜头。设计结果表明:在空间频率为 200 lp/mm处的 MTF值大于 0.4,接近衍射极限;在垂直半视场角 45°~90°的环景边缘区域拥有大于 75%的像素空间,使得环景展开后仍然具有较高的分辨率,从而代替多台不同方位的高解摄像机,实现高清全景监控。
Abstract
The relationship of super short-focus panoramic fish-eye lens’ focus and resolution was studied comprehensively. It is proved that the shorter the focus, the higher the resolution of scenic circle area. A panoramic fish-eye lens is presented, whose ratio of focus and image height is less than 0.35, horizontal field is up to 360° and vertical field is more than 180°. The results show that the spatial pixel of scenic circle area with half vertical field 45-90 degree is up to 75%, and the modulation transformation function is greater than 0.4 at the spatial frequency of 200 lp/mm. Its imaging quality is very well, its resolution of stretching the scenic circle is very high, and it works for panoramic monitor and high definition.
陈圣聪, 林峰. 超短焦全景鱼眼镜头的研究与设计[J]. 光电工程, 2012, 39(2): 48. CHEN Sheng-cong, LIN Feng. Research and Design of Super Short-focus Panoramic Fish-eye Lens[J]. Opto-Electronic Engineering, 2012, 39(2): 48.