MF-LPR2: Multi-frame license plate image restoration and recognition using optical flow

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Kihyun Na, Junseok Oh, Youngkwan Cho, Bumjin Kim, Sungmin Cho, Jinyoung Choi, Injung Kim

Published: 01 May 2025, Last Modified: 04 Nov 2025Computer Vision and Image UnderstandingEveryoneRevisionsCC BY-SA 4.0
Abstract: Highlights•Propose MF-LPR2, a multi-frame framework to restore low-quality license plates.•Align frames via novel optical flow filtering and refinement for robust restoration.•Introduces PDNF-k metric to measure spurious artifacts in restoration outputs.•Presents RLPR dataset: 200 dash cam sequences with 31 frames each for testing.•Achieve notable improvement over baselines in image quality and recognition accuracy.