The Property of Frequency Shift in 2D-FRFT Domain With Application to Image Encryption

The Fractional Fourier Transform (FRFT) has been playing a unique and increasingly important role in signal and image processing. In this letter, we investigate the property of frequency shift in two-dimensional FRFT (2D-FRFT) domain. It is shown that the magnitude of image reconstruction from phase information is frequency shift-invariant in 2D-FRFT domain, enhancing the robustness of image encryption, an important multimedia security task. Experiments are conducted to demonstrate the effectiveness of this property against the frequency shift attack, improving the robustness of image encryption.

Automated summary

The Fractional Fourier Transform (FRFT) plays a unique and important role in signal and image processing. This letter investigates frequency shift property in the two-dimensional FRFT (2D-FRFT) domain and demonstrates that image reconstruction from phase information remains frequency shift-invariant, enhancing image encryption robustness. Experiments show the effectiveness of this property against frequency shift attacks, improving the robustness of image encryption.