Weakly Supervised Object Detection (WSOD) is a task that detects objects in an image using a model trained only on image-level annotations. Current state-of-the-art models benefit from self-supervised instance-level supervision, but since weak supervision does not include count or location information, the most common ``argmax'' labeling method often ignores many instances of objects. To alleviate this issue, we propose a novel multiple instance labeling method called object discovery. We further introduce a new contrastive loss under weak supervision where no instance-level information is available for sampling, called weakly supervised contrastive loss (WSCL). WSCL aims to construct a credible similarity threshold for object discovery by leveraging consistent features for embedding vectors in the same class. As a result, we achieve new state-of-the-art results on MS-COCO 2014 and 2017 as well as PASCAL VOC 2012, and competitive results on PASCAL VOC 2007.

本文提出了一种名为object discovery的多实例标注方法以及一种名为weakly supervised contrastive loss（WSCL）的新对比损失函数用于针对WSOD任务，取得了在 MS-COCO2014/2017 和 PASCAL VOC2012 数据集上的最新最好结果，以及在 PASCAL VOC2007 上的竞争结果。

弱监督物体检测的对比学习目标发现