Polyp segmentation with distraction separation.

In clinical practice, automatic polyp segmentation in colonoscopy images is important for computer-aided clinical diagnosis of colorectal cancer. Existing polyp segmentation methods still suffer from the challenges of false positive/negative distractions to distinguish polyps and normal tissues. In this paper, we propose a novel Distraction Separation Network (DSNet) that mines potential polyp regions from the low-level semantic features while segregating background regions. To support the proposed framework, we propose two modules, including the neighbor fusion module (NFM) and the distraction separation module (DSM). The neighbor fusion module first integrates high-level features to obtain initial segmentation results as the prior guidance map. Guided by the prior results, multiple distraction separation modules are then employed to capture multi-scale contextual information for eliminating distraction. By separating distractions on different levels, DSNet can progressively refine segmentation results. Extensive experiments show that DSNet outperforms state-of-the-art methods on six challenging benchmark datasets.