Method for detecting embedding and extracting of multiple binary embedded watermarks of digital image

Abstract

The invention discloses a method for detecting embedding and extracting of multiple binary embedded watermarks of a digital image. The embedding of the watermark is realized by the following steps of: combining multiple binary watermark images to be embedded into a three-dimensional watermark; performing binary quantification on decimal data of a wavelet approximation image obtained by wavelet multi-level decomposition of original digital images according to 0 / 1 bit value of spatial pixels corresponding to each watermark component of the three-dimensional watermark; returning a logical table while realizing the embedding of multiple watermarks; and the extracting of the watermarks is realized by combining binary discrete discrimination with the logical table. K-1 binary watermark images in the embedded K binary watermark images can completely immune to any attack of the images and have ideal robustness. The quality of the digital image embedded with the binary watermark images is irrelevant to the number of the embedded binary watermark images. In addition, the original digital images are not needed during extracting the watermarks, and the safety of the original digital images isguaranteed.

Description

technical field [0001] The invention relates to a digital watermark embedding method, in particular to a method for embedding and extracting multiple binary watermarks of a digital image. Background technique [0002] In today's era of rapid development of the Internet and widespread dissemination of multimedia works, digital watermarking technology is an effective means to solve the copyright protection and ownership identification of multimedia works. However, most of the digital watermarking technologies studied at present are digital watermarking methods of single watermark embedding, which has the limitation of single function. The reason is that in practical applications, there are more needs to embed multiple watermarks in digital multimedia works to meet different purposes. For example, after a digital multimedia work is completed, two or more signatures are required to share the copyright, or For example, a digital multimedia work needs to mark the legal informatio...

AI Technical Summary

Problems solved by technology

[0006] From the above analysis, it can be seen that the multi-watermark method proposed above has certain deficiencies in watermark image quality and watermark robustness: 1) The quality of the digital image after embedding the watermark is not ideal, and the peak signal-to-noise ratio is relatively low. 2) The embedded watermark image is weak against conventional image processing or external attacks, and the detection effect of watermark images decreases with the processing or attack on digital images , the watermark is less robust

In fact, compared with the single-watermark embedding digital watermarking method, the multi-watermark embedding digital watermarking method has the following technical difficulties in its implementation: First, the digital image has a limited ability to accommodate watermarks, and embedding multiple watermarks successively will further Reduce the quality of digital images, or even damage their use value; Second, there are collisions or mutual influences between multiple watermarks, and the watermark embedded later may destroy the watermark embedded earlier, resulting in the failure of watermark detection

Therefore, how to effectively solve or balance the contradiction between the quality of the digital image after embedding multiple watermarks and the robustness of the watermark is a relatively difficult task for the multi-digital watermark embedding method, but no effective implementation method has been found yet.

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