Research Status and Development Trend of Digital Watermarking at Home and Abroad including Literatu

Throughout the development of digital watermarking, it should still be a new field of research, but in recent years.

With the maturity of digital watermarking technology and the diversification of its research directions, it is natural that there are still many untouched aspects.

The research topics should be more detailed and in-depth in future research work. It is summarized as follows:

Chapter 5 Summary and Prospects.

1) The digital watermarking algorithm is constantly improving, but there are still many shortcomings. At present, the most research on digital watermarking technology is still image watermarking, which has certain limitations. How to popularize the practicability of the algorithm is a long-term and arduous problem.

2) The research of digital watermarking technology, most people now study on the transformation domain, and these algorithms are not robust to the geometric transformation of images. For example, if the carrier image containing the watermark is rotated in Chapter 3, the watermark information cannot be extracted clearly, so this can also be a problem to be solved in the future.

3) At present, the international watermarking algorithm has not yet been fully mature, and a unified standard has not yet been established, this paper only detects the extracted watermark information, so as to verify the feasibility and practicability of the algorithm, and there is no unified standard for the evaluation of the advantages and disadvantages of different watermarks, so it has become the common wish of digital watermarking researchers to look forward to the establishment of an international general standard.

4) Although the robustness and transparency of the improved algorithm have been improved, the participation of the original watermark information is required in the process of watermark extraction, and the blind extraction of watermark is not realized, so in the next research and learning, the focus will be on how to realize blind extraction based on DCT and HVS and DCT and SVD digital watermark algorithms.

5) How to embed the watermark information into the color carrier image, which is also the next work to be further studied.

Digital watermarking is a new information hiding technology, and it has been less than 20 years since the concept was first proposed. Because it is still at the peak stage of academic research, there are only a few applied research and application cases, so there is no international standard, national standard and industry standard, and it is found that in addition to the report that "five mainstream computer and consumer electronics companies with Hu and internationally renowned computers, including IBM and Sony, have reached an agreement on the common standard of digital "watermarking" technology", it was only found that Chengdu Yufei Information Engineering Co., Ltd. drafted and obtained two enterprise standards for the record of the national standardization department. Printing and Printing Digital Watermark Software (record number: 1104-2002) and "Base.

Information Security System for Computers and Removable Storage Devices with Content, Non-Cryptographic Mechanisms" Enterprise Standard (Record No.: 400-2010). Therefore, there is no unified expression and definition of the concept of digital watermarking technology in the academic sales industry.

Digital watermarking technology is to directly embed some identification information (i.e., digital watermarking) into digital carriers (including multi-**, documents, software, etc.), but it does not affect the use value of the original carrier, and it is not easy for human perceptual systems (such as visual or auditory systems) to perceive or notice. Through the information hidden in the carrier, it is possible to identify the creator and purchaser of the content, transmit confidential information, or determine whether the carrier has been tampered with. Digital watermarking is an important research direction of information hiding technology.