Neighborhood Information-Based Label Refinement for Person Re-Identification with Label Noise

The existing excellent person re-identification (Re-ID) model is still affected by the samples with the incorrect labels. It is difficult to accurately annotate person images in the real scene, resulting in label noise. To avoid fitting to the noisy labels, a common solution in Re-ID is to replace the original label with the label predicted by the deep model. Unfortunately, similar samples of different identities with the same label are due to label noise, which is challenging for the model to distinguish them. Neighborhood information can optimize noisy labels through neighborhood labels and similarity between samples. This paper proposes a label refinement module based on neighborhood information (LRNI) for person Re-ID with label noise. Specifically, we first use the pre-trained model to extract features and calculate the similarity between samples. Rather than treating samples as isolated, the similarity used as label propagation weight and neighborhood labels are combined to optimize noisy labels. To further reduce the influence of label noise, we design a hard sample re-weighting (HSR) strategy to balance the learning of noisy and boundary samples. Experimental results under different noise settings demonstrate our method's effectiveness in the person Re-ID task.