用事件相机实现高空正射影像拼接,光照复杂时仍能成图
EvMAPPER: High Altitude Orthomapping with Event Cameras
- 基于事件相机异步触发特性,避免传统相机运动模糊
- 在强光与暗光下均生成清晰正射影像,动态范围超120dB
- 适合无人机在极端光照环境下进行高精度地图构建
传统无人机依赖基于CMOS的相机采集地表图像,用于生成正射影像拼接图。然而,使用全局或卷帘快门的CMOS相机在光照剧烈变化、运动模糊及高速移动物体场景下表现不佳。事件相机通过像素对亮度变化的异步触发机制,显著降低上述问题影响。本文首次提出基于事件相机的正射影像拼接方法,相比仅依赖CMOS相机的现有技术,该方法可在强光(如直射阳光)和弱光(如日落后)条件下稳定生成高质量正射影像,有效应对高动态范围(>120dB)与低照度挑战。
原文摘要 · Abstract (English)
Traditionally, unmanned aerial vehicles (UAVs) rely on CMOS-based cameras to collect images about the world below. One of the most successful applications of UAVs is to generate orthomosaics or orthomaps, in which a series of images are integrated together to develop a larger map. However, the use of CMOS-based cameras with global or rolling shutters mean that orthomaps are vulnerable to challenging light conditions, motion blur, and high-speed motion of independently moving objects under the camera. Event cameras are less sensitive to these issues, as their pixels are able to trigger asynchronously on brightness changes. This work introduces the first orthomosaic approach using event cameras. In contrast to existing methods relying only on CMOS cameras, our approach enables map generation even in challenging light conditions, including direct sunlight and after sunset.
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