MixCut:A Data Augmentation Method for Facial Expression Recognition

TL;DR

MixCut is a novel data augmentation technique for facial expression recognition that combines pixel-level interpolation and random pixel removal, significantly improving classification accuracy on benchmark datasets.

Contribution

The paper introduces MixCut, a new augmentation method that enhances facial expression recognition by combining interpolation and pixel removal, outperforming existing methods.

Findings

Achieved 85.63% accuracy on Fer2013Plus.

Achieved 87.88% accuracy on RAF-DB.

Outperformed CutOut, Mixup, and CutMix in accuracy improvements.

Abstract

In the facial expression recognition task, researchers always get low accuracy of expression classification due to a small amount of training samples. In order to solve this kind of problem, we proposes a new data augmentation method named MixCut. In this method, we firstly interpolate the two original training samples at the pixel level in a random ratio to generate new samples. Then, pixel removal is performed in random square regions on the new samples to generate the final training samples. We evaluated the MixCut method on Fer2013Plus and RAF-DB. With MixCut, we achieved 85.63% accuracy in eight-label classification on Fer2013Plus and 87.88% accuracy in seven-label classification on RAF-DB, effectively improving the classification accuracy of facial expression image recognition. Meanwhile, on Fer2013Plus, MixCut achieved performance improvements of +0.59%, +0.36%, and +0.39% compared to the other three data augmentation methods: CutOut, Mixup, and CutMix, respectively. MixCut improves classification accuracy on RAF-DB by +0.22%, +0.65%, and +0.5% over these three data augmentation methods.