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Prevalent semantic segmentation solutions are, in essence, a dense discriminative classifier of p(class|pixel feature). Though straightforward, this de facto paradigm neglects the underlying data distribution p(pixel feature|class), and struggles to identify out-of-distribution data. Going beyond this, we propose GMMSeg, a new family of segmentation models that rely on a dense generative classifier for the joint distribution p(pixel feature,class). For each class, GMMSeg builds Gaussian Mixture Models (GMMs) via Expectation-Maximization (EM), so as to capture class-conditional densities. Meanwhile, the deep dense representation is end-to-end trained in a discriminative manner, i.e., maximizing p(class|pixel feature). This endows GMMSeg with the strengths of both generative and discriminative models. With a variety of segmentation architectures and backbones, GMMSeg outperforms the discriminative counterparts on three closed-set datasets. More impressively, without any modification, GMMSeg even performs well on open-world datasets. We believe this work brings fundamental insights into the related fields.
Author Information
Chen Liang
Wenguan Wang (University of Technology Sydney)
Currently I am a Lecturer and ARC DECRA Fellow at the ReLER lab@University of Technology Sydney. My research interests lie in the intersection of computer vision, artificial intelligence, and cognition. The ultimate goal of my research is to develop a machine that can perceive, reason, and plan in real-world scenes like humans.
Jiaxu Miao (Zhejiang University)
Yi Yang (Zhejiang University)
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