Aerial full spherical HDR imaging and display
Aerial full spherical HDR imaging and display
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DOI：
10.1007/s10055-014-0249-x
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发表时间：
2014-08
期刊：
影响因子：
4.2
通讯作者：
Fumio Okura;M. Kanbara;N. Yokoya
中科院分区：
文献类型：
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作者：
Fumio Okura;M. Kanbara;N. Yokoya
本文描述了一个用于虚拟现实应用的高动态范围（HDR）场景的航空成像框架，例如沉浸式全景应用和使用基于图像的照明的虚拟物体的逼真叠加。我们提出了一个完整的、实用的系统，从天空中获取全球面HDR图像，使用两个全向相机安装在一个无人驾驶飞机的上下。HDR图像是由自动控制不同曝光的多幅全向图像组合而成。我们的系统包括图像补全、对齐和色彩校正方法，以及一种新颖的自动曝光控制方法，该方法选择最佳曝光以避免条带伪影。实验结果表明，与普通球面图像补全系统相比，该系统生成的球面图像在自然度和精度方面都有较好的提高。除了提出一种成像方法外，我们还利用该系统获取的球面图像进行了空中HDR沉浸式全景图的显示方法实验。实验证明，除了普通的HDR图像使用外，HDR成像还有利于使用HMD进行沉浸式全景。
This paper describes a framework for aerial imaging of high dynamic range (HDR) scenes for use in virtual reality applications, such as immersive panorama applications and photorealistic superimposition of virtual objects using image-based lighting. We propose a complete and practical system to acquire full spherical HDR images from the sky, using two omnidirectional cameras mounted above and below an unmanned aircraft. The HDR images are generated by combining multiple omnidirectional images captured with different exposures controlled automatically. Our system consists of methods for image completion, alignment, and color correction, as well as a novel approach for automatic exposure control, which selects optimal exposure so as to avoid banding artifacts. Experimental results indicated that our system generated better spherical images compared to an ordinary spherical image completion system in terms of naturalness and accuracy. In addition to proposing an imaging method, we have carried out an experiment about display methods for aerial HDR immersive panoramas utilizing spherical images acquired by the proposed system. The experiment demonstrated HDR imaging is beneficial to immersive panorama using an HMD, in addition to ordinary uses of HDR images.