Unifying Instance and Panoptic Segmentation with Dynamic Rank-1 Convolutions

• URL: http://arxiv.org/abs/2011.09796v1
• Date: Thu, 19 Nov 2020 12:42:10 GMT
• Title: Unifying Instance and Panoptic Segmentation with Dynamic Rank-1 Convolutions
• Authors: Hao Chen, Chunhua Shen, Zhi Tian
• Abstract summary: DR1Mask is the first panoptic segmentation framework that exploits a shared feature map for both instance and semantic segmentation. As a byproduct, DR1Mask is 10% faster and 1 point in mAP more accurate than previous state-of-the-art instance segmentation network BlendMask.
• Score: 109.2706837177222
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Recently, fully-convolutional one-stage networks have shown superior performance comparing to two-stage frameworks for instance segmentation as typically they can generate higher-quality mask predictions with less computation. In addition, their simple design opens up new opportunities for joint multi-task learning. In this paper, we demonstrate that adding a single classification layer for semantic segmentation, fully-convolutional instance segmentation networks can achieve state-of-the-art panoptic segmentation quality. This is made possible by our novel dynamic rank-1 convolution (DR1Conv), a novel dynamic module that can efficiently merge high-level context information with low-level detailed features which is beneficial for both semantic and instance segmentation. Importantly, the proposed new method, termed DR1Mask, can perform panoptic segmentation by adding a single layer. To our knowledge, DR1Mask is the first panoptic segmentation framework that exploits a shared feature map for both instance and semantic segmentation by considering both efficacy and efficiency. Not only our framework is much more efficient -- twice as fast as previous best two-branch approaches, but also the unified framework opens up opportunities for using the same context module to improve the performance for both tasks. As a byproduct, when performing instance segmentation alone, DR1Mask is 10% faster and 1 point in mAP more accurate than previous state-of-the-art instance segmentation network BlendMask. Code is available at: https://git.io/AdelaiDet

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