极简笔记 Multi-Scale Context Intertwining for Semantic Segmentation

本文介绍的MSCI算法在PASCAL VOC 2012 test集上表现优秀,结合传统分割算法与CNN,利用LSTM进行多尺度特征交互。流程包括超像素分割、特征提取、信息交互和LSTM融合。经过反卷积融合,算法在多个数据集上验证其效果,适用于全景分割任务。

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极简笔记 Multi-Scale Context Intertwining for Semantic Segmentation

本文提出MSCI语义分割算法,在PASCAL VOC 2012 test集上目前是top5算法(第一名是用了JFT的deeplabv3+)。区别于传统FCN架构,本文的分割结果融合了网络特征与传统分割算法,通过LSTM进行融合。

文章大致流程如下:

  1. 利用传统分割算法预先得到数个超像素,与此同时利用CNN对输入图像提取不同层次特征;

  2. 对相邻层级的特征进行信息交互。记需要交互的两层分别为 l , l + 1 l, l+1 l,l+1对每一个像素点,需要获取三部分特征:1. 该像素位置的网络特征 F l ( h , w ) F^l(h,w) Fl(h,w);2. 该像素所处超像素区域 S n S_n Sn的特征之和 R n l = ∑ ( h , w ) ∈ Φ ( S n ) F l ( h , w ) R^l_n=\sum_{(h,w)\in \Phi(S_n)}F^l(h,w) Rnl=(h,w)Φ(Sn)

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