Super-Resolving Dynamic Scenes with Spike Camera via Multi-Frame Sequential Alignment with Motion Propagation.

Spike camera is a neuromorphic sensor that can capture high-speed dynamic scenes by firing a continuous stream of binary spikes with extremely high temporal resolution, essentially forming a dense sampling in the temporal dimension. Due to the relative motion between camera and scene, each pixel is actually sampling at a large number of different spatial positions on the object in a short period. Converting this dense sampling from temporal dimension to spatial domain, high resolution images can be reconstructed from the spike stream. However, spike fluctuations and large motion in high-speed scenes pose great challenges for this task, especially for intensity information extraction and temporal alignment. In this paper, we propose a spike camera super resolution network to address these issues. Considering the local temporal correlation of spike stream and correlation consistency within a local region, we introduce a representation module that performs region-adaptive temporal filtering on spikes to mitigate fluctuations and extract stable intensity information from binary data. Additionally, we develop a module for multi-frame feature alignment, leveraging the long-term temporal information of spike stream. To handle large motions, we propagate the motion information from neighboring moment to current feature alignment module, which provides a prior that helps to narrow the search range for current motion offset, improving the accuracy of temporal alignment. Experimental results demonstrate that the proposed network achieves state-of-the-art performance on synthetic and real-captured spike data.