Figure 2From: Counteracting geometrical attacks on robust image watermarking by constructing a deformable pyramid transform System diagram of DPT represented in the Fourier domain. C j (r)(j = 0, 1, …, J − 1) are the scalable basis filters designed from the kernelH(r), and the other filters are the same as those in Figure 1. Recursively inserting the sub-system in the dashed box at the location of the filled circle forms the multi-scale DPT.Back to article page