| Summary: | With the development of the Internet, storage and transmission technologies such
as printers and scanners, digital multimedia products are rapidly transmitted through
the Internet broadcasting, multimedia works becoming easy to obtain and illegally
tampering and copying. The copyright of media works urgently needs to be protected.
The development of cryptography and information security technologies has provided
support for content security and copyright protection for multimedia works. As an
important information security scheme, digital watermarking technology provides a
powerful solution to the protection of multimedia works. Based on the previous work, this paper completed the following work in response to the current development of digital watermarking.
1) Understand the characteristics, classification and application of digital
watermarking technology, review the research background of digital watermarking
technology, study several common transformations of image domain watermarking in
transform domain and image scrambling technology, based on existing algorithms. An
image digital watermarking algorithm combining discrete wavelet transform, discrete
cosine transform and matrix singular value decomposition and new scrambling
technique is proposed. According to the shortcomings of related algorithms, grayscale
scrambling and pseudo magic square transform is used to improve the robustness of the
algorithm.
2) Experiments based on Python 3.7 are made to test the proposed watermarking
algorithm. All the experimental results show that the image watermarking algorithm
based on DCT-DWT-SVD and scrambling proposed in this paper has strong
imperceptibility and robustness. When the watermark is added, the image undergoes
common signal processing such as chopping, rotation, filtering, etc. After that, the
presence of the watermark can still be detected and the calculation speed is faster.
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