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Multi-semantic region weighting and multi-scale flatness weighting based image retrieval

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Abstract

The feature representation of images is the key to bridge the semantic gap and make computer understand images in the tasks of image retrieval. In image recognition, semantic regions and salient targets are irreplaceable parts of image cognition. The purpose of segmenting semantic regions is to analyze the connections between image targets, while some distinctive targets are able to highlight the important semantics. However, the semantic regions and salient targets were often ignored in previous retrieval methods. Considering the two aspects, this paper proposes an unsupervised image retrieval method based on multi-semantic region weighting and multi-scale flatness weighting. Firstly, we divide the semantic regions by using the Fully Convolutional Network and calculate the multi-Semantic weight map (S-mask) to obtain the global features. Secondly, we introduce a flatness-weighted strategy to weight feature maps and aggregate the multi-scale features to obtain the local features. Finally, we cascade the global features and the local features to construct the final image representation. There are two main contributions in this paper. One is that the S-mask assigns different weights to the semantic regions. It distinguishes the importance of the semantic regions and balances the weight within the semantic region. The other is that the flatness-weighted strategy suppresses the background and highlights the target region. Experimental results demonstrate that the proposed method achieves the state-of-the-art performance on Paris and Oxford databases.

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Acknowledgements

The authors would like to thank the anonymous reviewers for valuable comments. This work was partly supported by National Natural Science Foundation of China (No.62072394), Natural Science Foundation of Hebei province (F2017203169) and Key Scientific Research Projects of Colleges and Universities in Hebei province (ZD2017080).

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Correspondence to Huibin Lu.

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Gu, G., Li, Z., Feng, L. et al. Multi-semantic region weighting and multi-scale flatness weighting based image retrieval. Soft Comput 25, 5699–5708 (2021). https://doi.org/10.1007/s00500-020-05565-5

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  • DOI: https://doi.org/10.1007/s00500-020-05565-5

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