Table 2 Summary of employed methods and respective objectives.

From: Convolutional neural network and wavelet composite against geometric attacks a watermarking approach

Employed schemes

Description

Multiple watermarking

Reduced storage and bandwidth during transmission, which enhances the security and computational complexity

Transform domain (DWT + SVD)

Better robustness than the spatial domain

Arithmetic coding + RLC

Compressing the payload, in turn, enhances the imperceptibility.

Selective encryption

Enhances the security

CNN

Improves restoration image quality against channel noise