Abstract
Convolutional sparse coding (CSC) as an interpretable signal representation and decomposition model has achieved promising performance in medical image fusion by virtue of translation-invariant dictionary. CSC-based compensates for the limited detail preservation capability and high sensitivity to misregistration of SR-based fusion methods. However, existing CSC-based fusion methods have high time consumption due to batch mode. The online convolutional sparse coding (SCSC) model of Sample-Dependent dictionary borrows the idea of separable filters with much lower time cost than CSC. In this paper, SCSC is introduced to medical image fusion to balance fusion performance and time consumption. The proposed method adopts classical ‘decomposition-fusion-reconstruction’ framework. Firstly, source images are decomposed into base and detail layers using two-scale image decomposition (Fast Fourier Transform). Secondly, average strategy is applied to base layer and detail layer uses SCSC to obtain fused detail components. Finally, two-scale image reconstruction (inverse Fast Fourier Transform) is used to reconstruct fused image. The analysis of subjective and objective results shows that our method improves efficiency while ensuring excellent fusion performance.
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Acknowledgments
This work is supported by Sichuan Science and Technology Program(2023NSFSC0495), Si-chuan University and Luzhou Municipal People’s Government Strategic cooperation pro-jects(2020CDLZ-10) and Colleague Project of Intelligent Policing Key Laboratory of Sichuan Province (ZNJW2022ZZMS001, ZNJW2023ZZQN004).
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Zhang, C., Feng, Z., Zhang, C., Yi, K. (2023). An Efficient Medical Image Fusion via Online Convolutional Sparse Coding with Sample-Dependent Dictionary. In: Lu, H., et al. Image and Graphics . ICIG 2023. Lecture Notes in Computer Science, vol 14359. Springer, Cham. https://doi.org/10.1007/978-3-031-46317-4_1
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