Bander Albarakati, Abdullah Basuhail, Gibrael Abo Samra Bander Albarakati, Abdullah Basuhail, Gibrael Abo Samra
This paper presents a new watermarking technique using hybrid image transforms that aims to be
very robust against attacks. It also aims to reduce the amount of distortion created from embedding the
watermark as much as possible, and have good capacity. The proposed system uses a hybrid watermarking
technique that is based on Non-Subsampled Contourlet Transform and Discrete Wavelet Transform. In addition,
the proposed system makes use of the fuzzy logic to automatically choose the strength of the embedded
watermark. Furthermore, the system uses Spread Spectrum Code Division Multiple Access to embed and recover
the watermark after transforming the image. To enhance recoverability of the watermarks, the system uses a
high level of redundancy in the embedding process, which allows a powerful Error Correcting Code to be used
in the recovery process. The fuzzy logic is used to help the system in producing watermarked images that reserve
their quality and not be heavily altered after embedding the watermark. Experiments were performed to measure
the quality of the proposed system using JPEG compression attacks. The results showed that the proposed system
is robust and has good capacity and imperceptibly although it suffers from being computationally complex.
Practical performance analysis of secure modulations for woa spread-spectrum based image watermarking