Best Linear Unbiased Estimation for 2D and 3D Flow with Event-based Cameras

Juan L. Valerdi, Xabier Iturbe; Proceedings of the Computer Vision and Pattern Recognition Conference (CVPR) Workshops, 2025, pp. 4908-4917

Dynamic Vision Sensors (DVS) provide low-latency, high-dynamic-range motion estimation, but their real-time applicability is often limited by the computational complexity and latency overheads introduced by iterative motion compensation techniques. In this work, we propose a novel probabilistic model that leverages the stochastic distribution of events along moving edges. Using our model, we introduce a lightweight patch-based algorithm that employs a linear combination of event spatial coordinates, making it highly suitable for implementation on specialized hardware. Our approach exhibits linear scalability with dimensionality, making it suitable for emerging event-based 3D sensors, such as Light-Field DVS (LF-DVS). Experimental results validate the efficiency and scalability of our method, establishing a solid foundation for real-time event-based ultra-efficient 2D and 3D motion estimation.