DIGITAL IMAGE WATERMARKING METHOD USING THE GYRATOR AND DYADIC WAVELET TRANSFORMS

We propose a new digital watermarking method combining the gyrator transform and the dyadic wavelet transform (DYWT). The gyrator transform produces a rotation dependent on the angle in the twisted phase plane, while DYWT has the properties of redundancy and shift invariance. Combining these two transforms, we develop a new digital watermarking method that enables multi-resolution analyses of images twisted in the spatial frequency plane. Using experiments, we confirm the image quality of the watermarked images and their resistance to various attacks, including clipping, JPEG compression, and geometric manipulation. The results are shown, and the effectiveness of this new method is examined.