A general multi-modal data learning method for Person Re-identification

This paper proposes a general multi-modal data learning method, which includes Global Homogeneous Transformation, Local Homogeneous Transformation and their combination. During ReID model training, on the one hand, it randomly selected a rectangular area in the RGB image and replace its color with the same rectangular area in corresponding homogeneous image, thus it generate a training image with different homogeneous areas; On the other hand, it convert an image into a homogeneous image. These two methods help the model to directly learn the relationship between different modalities in the Special ReID task. In single-modal ReID tasks, it can be used as an effective data augmentation. The experimental results show that our method achieves a performance improvement of up to 3.3% in single modal ReID task, and performance improvement in the Sketch Re-identification more than 8%. In addition, our experiments also show that this method is also very useful in adversarial training for adversarial defense. It can help the model learn faster and better from adversarial examples.