Li Hui, Peng Jing, Pan Fan, Wu Yuntao, Zhang Yanduo, Xie Xiaolin
Opt Express. 2018 May 14;26(10):12441-12454. doi: 10.1364/OE.26.012441.
A focal stack camera, based on an electrically tunable-focusing liquid crystal (LC) lens doped with multi-walled carbon nanotubes, is proposed to generate a single all-in-focus image of a 3D scene without depth map in a relatively short time. Focal sweep strategy of the camera is devised. Both its depth of field (DOF) and focal sweep speed are analyzed and deduced. Nano doping method is adopted to improve electro-optical features of the LC lens. To efficiently produce all-in-focus image, a weighted average algorithm for all images in the focal stack is utilized. The experiments show that the result is a high contrast at sensor resolution. It is greatly potential in optical compact 3D imaging system.
提出了一种基于掺杂多壁碳纳米管的电可调聚焦液晶（LC）透镜的焦堆栈相机，以在相对较短的时间内生成三维场景的单个全聚焦图像，而无需深度图。设计了相机的焦扫策略。分析并推导了其景深（DOF）和焦扫速度。采用纳米掺杂方法改善液晶透镜的电光特性。为了有效地生成全聚焦图像，对焦堆栈中的所有图像采用加权平均算法。实验表明，在传感器分辨率下结果具有高对比度。它在光学紧凑型三维成像系统中具有很大的潜力。
