Abstract
The key to improving the fusion quality of infrared–visible images is effectively extracting and fusing complementary information such as bright–dark information and saliency details. For this purpose, an improved hybrid multiscale fusion algorithm inspired by non-subsampled shearlet transform (NSST) is proposed. In this algorithm, firstly, the support value transform (SVT) is used instead of the non-subsampled pyramid as the frequency separator to decompose an image into a set of high-frequency support value images and one low-frequency approximate background. These support value images mainly contain the saliency details from the source image. And then, the shearlet transform of NSST is retained to further extract the saliency edges from these support value images. Secondly, to extract the bright–dark details from the low-frequency approximate background, a morphological multiscale top–bottom hat decomposition is constructed. Finally, the extracted information is combined by different rules and the fused image is reconstructed by the corresponding inverse transforms. Experimental results have shown the proposed algorithm has obvious advantages in retaining saliency details and improving image contrast over those state-of-the-art algorithms.
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Experimental images in Fig. 5 can be obtained through the public dataset “Toet A. TNO Image fusion dataset” https://figshare.com/articles/TN_Image_Fusion_Dataset/1008029. In addition, the experimental fusion images will be made available upon reasonable request for academic use and within the limitations of the provided informed consent by the corresponding author upon acceptance.
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Acknowledgements
We sincerely thank the reviewers and editors for carefully checking our manuscript and providing many suggestions. This work is supported by the Natural Science Research Project of Anhui Educational Committee (No. 2022AH050801), University-level key projects of Anhui University of science and technology (No. QNZD2021-02), Anhui Provincial Natural Science Foundation (No. 2208085ME128), Scientific Research Foundation for Highlevel Talents of Anhui University of Science and Technology (No. 13210679), Huainan Science and Technology Planning Project (No. 2021005).
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Hu, P., Wang, C., Li, D. et al. An improved hybrid multiscale fusion algorithm based on NSST for infrared–visible images. Vis Comput 40, 1245–1259 (2024). https://doi.org/10.1007/s00371-023-02844-8
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DOI: https://doi.org/10.1007/s00371-023-02844-8