Semi-supervised semantic segmentation has recently gained increasing research interest as it can reduce the requirement for large-scale fully-annotated training data by effectively exploiting large amounts of unlabelled data. The current methods often suffer from the confirmation bias from the pseudo-labelling process, which can be alleviated by the co-training framework. The current co-training-based semi-supervised semantic segmentation methods rely on hand-crafted perturbations to prevent the different sub-nets from collapsing into each other, but these artificial perturbations cannot lead to the optimal solution. In this work, we propose a new conflict-based cross-view consistency (CCVC) method based on a two-branch co-training framework for semi-supervised semantic segmentation. Our work aims at enforcing the two sub-nets to learn informative features from irrelevant views. In particular, we first propose a new cross-view consistency (CVC) strategy that encourages the two sub-nets to learn distinct features from the same input by introducing a feature discrepancy loss, while these distinct features are expected to generate consistent prediction scores of the input. The CVC strategy helps to prevent the two sub-nets from stepping into the collapse. In addition, we further propose a conflict-based pseudo-labelling (CPL) method to guarantee the model will learn more useful information from conflicting predictions, which will lead to a stable training process. We validate our new semi-supervised semantic segmentation approach on the widely used benchmark datasets PASCAL VOC 2012 and Cityscapes, where our method achieves new state-of-the-art performance.

本文提出了一种新的基于双分支协同训练框架的基于冲突的跨视图一致性方法(CCVC)，该方法使用特征差距损失鼓励两个子网络从相同的输入学习不同的特征，并使用冲突的伪标签方法来保证模型可以从冲突预测中学习更多有用的信息，从而在半监督语义分割(Semantic Segmentation)任务中取得了最新的最优性能.

基于冲突的交叉视图一致性的半监督语义分割