Abstract
The quaternion linear canonical transform (QLCT), as a generalized form of the quaternion Fourier transform, is a powerful analyzing tool in image and signal processing. In this paper, we propose three different forms of uncertainty principles for the two-sided QLCT, which include Hardy’s uncertainty principle, Beurling’s uncertainty principle and Donoho–Stark’s uncertainty principle. These consequences actually describe the quantitative relationships of the quaternion-valued signal in arbitrary two different QLCT domains, which have many applications in signal recovery and color image analysis. In addition, in order to analyze the non-stationary signal and time-varying system, we present Lieb’s uncertainty principle for the two-sided short-time quaternion linear canonical transform (SQLCT) based on the Hausdorff–Young inequality. By adding the nonzero quaternion-valued window function, the two-sided SQLCT has a great significant application in the study of signal local frequency spectrum. Finally, we also give a lower bound for the essential support of the two-sided SQLCT.
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Acknowledgements
The authors would like to thank the anonymous referees for their valuable comments and suggestions. This paper was in part supported by the Natural Science Foundation of China Grant No. 11371050.
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Zhu, X., Zheng, S. Uncertainty Principles for the Two-Sided Quaternion Linear Canonical Transform. Circuits Syst Signal Process 39, 4436–4458 (2020). https://doi.org/10.1007/s00034-020-01376-z
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DOI: https://doi.org/10.1007/s00034-020-01376-z
Keywords
- Quaternion linear canonical transform (QLCT)
- Quaternion Fourier transform (QFT)
- Uncertainty principle
- Short-time quaternion linear canonical transform (SQLCT)