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AWFA-LPD: Adaptive Weight Feature Aggregation for Multi-frame License Plate Detection

For license plate detection (LPD), most of the existing work is based on images as input. If these algorithms can be applied to multiple frames or videos, they can be adapted to more complex unconstrained scenes. In this paper, we propose a LPD framework for detecting license plates in multiple frames or videos, called AWFA-LPD, which effectively integrates the features of nearby frames. Compared with image based detection models, our network integrates optical flow extraction module, which can propagate the features of local frames and fuse with the reference frame. Moreover, we concatenate a non-link suppression module after the detection results to post-process the bounding boxes. Extensive experiments demonstrate the effectiveness and efficiency of our framework.