Abstract
Unsupervised semantic segmentation aims to obtain high-level semantic representation on low-level visual features without manual annotations. Most existing methods are bottom-up approaches that try to group pixels into regions based on their visual cues or certain predefined rules. As a result, it is difficult for these bottom-up approaches to generate fine-grained semantic segmentation when coming to complicated scenes with multiple objects and some objects sharing similar visual appearance. In contrast, we propose the first top-down unsupervised semantic segmentation framework for fine-grained segmentation in extremely complicated scenarios. Specifically, we first obtain rich high-level structured semantic concept information from large-scale vision data in a self-supervised learning manner, and use such information as a prior to discover potential semantic categories presented in target datasets. Secondly, the discovered high-level semantic categories are mapped to low-level pixel features by calculating the class activate map (CAM) with respect to certain discovered semantic representation. Lastly, the obtained CAMs serve as pseudo labels to train the segmentation module and produce the final semantic segmentation. Experimental results on multiple semantic segmentation benchmarks show that our top-down unsupervised segmentation is robust to both object-centric and scene-centric datasets under different semantic granularity levels, and outperforms all the current state-of-the-art bottom-up methods. Our code is available at https://github.com/damo-cv/TransFGU.
Z. Yin—Work done during an internship at Alibaba Group.
P. Wang—Project lead.
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Acknowledgements
This work was supported by funds for Key R &D Program of Hunan (2022SK2104), Leading plan for scientific and technological innovation of high-tech industries of Hunan (2022GK4010), the National Natural Science Foundation of Changsha (kq2202176), National Key R &D Program of China (2021YFF0900602), the National Natural Science Foundation of China (61672222) and Alibaba Group through Alibaba Research Intern Program.
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Yin, Z. et al. (2022). TransFGU: A Top-Down Approach to Fine-Grained Unsupervised Semantic Segmentation. In: Avidan, S., Brostow, G., Cissé, M., Farinella, G.M., Hassner, T. (eds) Computer Vision – ECCV 2022. ECCV 2022. Lecture Notes in Computer Science, vol 13689. Springer, Cham. https://doi.org/10.1007/978-3-031-19818-2_5
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