Superpixel via coarse-to-fine boundary shift


K-means is used by numerous superpixel algorithms, such as SLIC, MSLIC and LSC, because of its simplicity and efficiency. Yet those k-means based algorithm failed to perform well on connectivity and accuracy. In this paper, we propose a coarse-to-fine boundary shift strategy (CFBS) as a replacement of k-means. The CFBS solves the superpixel segmentation problem by shifting boundries rather than clustering pixels. In other words, it can be defined as a special k-means algorithm optimized for superpixel segmentation. By replacing k-means with CFBS, SLIC and LSC are upgraded to NeoSLIC and NeoLSC. Experiments show that NeoSLIC and NeoLSC outperform SLIC and LSC in accuracy and efficiency respectively, and NeoSLIC and NeoLSC alleviate dis-connectivity. In addition, experiments also show that CFBS achieves great improvements on semantic segmentation, class segmentation and segmented flow.

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This work was supported by the National High Technology Research, Development Program of China (No.2017YFB1401600), the National Natural Science Foundation of China (No.61573235, 61703260), the Shanghai Innovation Action Project of Science and Technology (No.18511107400), and the Fundamental Research Funds for the Central Universities.

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Correspondence to Yufei Chen.

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Wu, X., Chen, Y., Liu, X. et al. Superpixel via coarse-to-fine boundary shift. Appl Intell 50, 2079–2092 (2020).

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  • Superpixel
  • Slic
  • K-means