Abstract
Copyright protection for digital multimedia has become a research hotspot in recent years. As an efficient solution, the digital watermarking scheme has emerged at the right moment. In this article, a highly robust and hybrid watermarking method is proposed. The discrete wavelet transform (DWT) and all phase discrete cosine biorthogonal transform (APDCBT) presented in recent years as well as the singular value decomposition (SVD) are adopted in this method to insert and recover the watermark. To enhance the watermark imperceptibility, the direct current (DC) coefficients after block-based APDCBT in high frequency sub-bands (LH and HL) are modified by using the watermark. Compared with the conventional SVD-based watermarking method and another watermarking technique, the watermarked images obtained by the proposed method have higher image quality. In addition, the proposed method achieves high robustness in resisting various image processing attacks.
Highlights
With the widespread use of image processing tools, it becomes increasingly easy for ordinary people to obtain images and modify their contents
Digital watermarking schemes can fall into two broad categories according to different application scenarios: robust watermarking and fragile watermarking [1]
We have presented a highly robust watermarking algorithm, in which the all phase discrete cosine biorthogonal transform (APDCBT)
Summary
With the widespread use of image processing tools, it becomes increasingly easy for ordinary people to obtain images and modify their contents. They proposed an optimized SVD-based watermarking method, in which an optimal scaling factor is identified using an optimization algorithm called the firefly algorithm (FA) [17] This scheme achieves a good balance between robustness and imperceptibility, it can lead to false-positive problem during the watermark extraction process [18]. Two matrices generated from the four most significant bit-planes and the four least significant bit-planes of the watermark are transformed by DCT and inserted into the singular values of the carrier image using a DWT-SVD-based method. Fazli and Moeini [22] proposed a hybrid DWT-DCT-SVD-based watermarking algorithm In this method, the original carrier image is average split into four parts.
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