Multimodal Monocular Dense Depth Estimation with Event-Frame Fusion Using Transformer

Frame cameras struggle to estimate depth maps accurately under abnormal lighting conditions. In contrast, event cameras, with their high temporal resolution and high dynamic range, can capture sparse, asynchronous event streams that record pixel brightness changes, addressing the limitations of frame cameras. However, the potential of asynchronous events remains underexploited, which hinders the ability of event cameras to predict dense depth maps effectively. Integrating event streams with frame data can significantly enhance the monocular depth estimation accuracy, especially in complex scenarios. In this study, we introduce a novel depth estimation framework that combines event and frame data using a transformer-based model. Our proposed framework contains two primary components: a multimodal encoder and a joint decoder. The multimodal encoder employs self-attention mechanisms to analyze the interactions between frame patches and event tensors, mapping out dependencies across local and global spatiotemporal events. This multi-scale fusion approach maximizes the benefits of both event and frame inputs. The joint decoder incorporates a dual-phase, triple-scale feature fusion module, which extracts contextual information and delivers detailed depth prediction results. Our experimental results on the EventScape and MVSEC datasets affirm that our method sets a new benchmark in performance.