Aerial Imaging by Retro-Reflection for Mid-Air Image Display and Camera Viewpoint Transfer
Aerial Imaging by Retro-Reflection for Mid-Air Image Display and Camera Viewpoint Transfer
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DOI：
10.1109/access.2021.3057056
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Kei Tsuchiya;Naoya Koizumi
中科院分区：
文献类型：
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作者：
Kei Tsuchiya;Naoya Koizumi
此前，一种名为Levitar的远程呈现系统被提出，允许通过计算机图形(CG)化身在真实空间中进行通信。Levitar使用微镜阵板(MMAP)来显示空中图像，并将相机的视点光学地转移到空中图像显示位置。该系统捕捉到了半空中图像头像的第一人称视角，但它有一个限制，即MMAP引起的杂散光会缩小其范围。因此，在这项研究中，我们提出了一种光学系统来捕捉更广泛的空中视点。所提出的光学系统使用航空逆向反射成像(AIRR)代替MMAP用于空中图像显示和相机视点转移。AIRR是一种空中成像系统，包括分束器和后向反射器。然而，与MMAP相比，它不会产生杂散光。通过AIRR对相机视点进行光学传递，可以捕捉到大范围的图像。为了评估使用MMAP和AIRR相机时的拍摄区域范围，我们在不同的相机凝视方向和有效视角下进行了实验。结果表明，AIRR的分辨率在40°以上，而MMAP的分辨率在30°以上，AIRR的标记检测面积比MMAP的大约54%。这意味着对于空中远程呈现系统，AIRR获得了比MMAP更宽的成像范围。
Previously, a telepresence system, called Levitar, was proposed to allow communication through computer-graphics (CG) avatars in real space. Levitar employs micro-mirror array plates (MMAPs) to display mid-air images and optically transfer the camera viewpoint to the mid-air image-display position optically. This system captures the first-person view of a mid-air image avatar; however, it has a limitation that the stray light caused by MMAPs reduces its range. Therefore, in this study, we propose an optical system to capture a wider range of mid-air viewpoints. The proposed optical system uses aerial imaging by retro-reflection (AIRR) instead of MMAPs for mid-air image display and camera viewpoint transfer. AIRR is a mid-air imaging system that includes a beam splitter and retro-reflector. However, in contrast to MMAPs, it does not generate stray light. The optical transfer of the camera viewpoint by AIRR enables the capture of a large area. To evaluate the range of the capturing area when using cameras with MMAPs and AIRR, we conducted experiments under different camera gaze directions and effective angle of view. The results indicate that AIRR maintains a constant resolution up to 40° of the camera gaze direction, whereas MMAPs have a lower resolution above 30°, and the area of the marker detection rate of over 80% is approximately 54% larger for AIRR than for MMAPs. This implies that AIRR achieved a wider imaging range than MMAPs for mid-air telepresence systems.