Digital watermarking embedding, extracting and quantizing step size coordinating factor optimizing method and device

Abstract

The invention relates to an embedding, extracting and quantization step size coordination factor optimizing method of a digital watermark and a device thereof. The embodiment of an embedding method of the digital watermark comprises the steps that: an image to be embedded with the digital watermark is divided into image subblocks with preset size; DCT (discrete cosine transform) is executed to the image subblocks; SVD (singular value transform) is executed to the result after DCT so as to obtain a blocking singular value vector of the image subblocks; a texture masking parameter is calculated to obtain a brightness masking parameter; according to a quantization step size coordination factor, the brightness marking parameter and the texture masking parameter of the image subblocks, a self-adaptive quantization step size of the image subblocks is obtained; the self-adaptive quantization step size of the image subblocks and the blocking singular value vector are quantized to obtain a quantization value; amendment is carried out according to the quantization value and the information of the digital watermark to obtain an amendment value of the information of the digital watermark; and the amendment value containing the information of the digital watermark is utilized to obtain the image embedded with the digital watermark. The embodiment of the invention realizes the balance of the invisibility and the robustness of a digital watermarking method.

Description

technical field [0001] The invention relates to the technical field of digital watermarking, in particular to a digital watermark embedding, extraction and quantization step size coordination factor optimization method and device. Background technique [0002] With the popularization and rapid development of multimedia technology and computer network technology, multimedia information (digital images, digital videos, and three-dimensional models, etc.) In order to effectively protect the copyright of multimedia information and the integrity of multimedia information content, people are increasingly concerned about it. Digital watermarking technology has emerged as the times require, and it has become an effective method to solve the above problems. [0003] Digital watermarking technology is a kind of information hiding technology. It embeds some information that can prove copyright ownership or track infringement information in digital multimedia information through a certa...

AI Technical Summary

Problems solved by technology

[0009] In the prior art, the selection of the quantization step size in some DCT-SVD digital watermarking methods is fixed, and the quantization step size cannot be adaptively selected, so it cannot be selected according to the invisibility and robustness of different positions of the image information. Taking an adaptive quantization step size can not better achieve the balance between the invisibility and robustness of the digital watermarking method

[0010] In the prior art, although some DCT-SVD digital watermarking methods can adaptively select the quantization step size, such as using the sampling artificial intelligence method or using the grid search method to determine the adaptive quantization step size, these digital watermarking methods However, it does not combine the human visual system (HVS, Human Visual System) to realize the selection of adaptive quantization step size, so that the adaptability of these digital watermarking methods is not very good, and the invisibility and robustness of digital watermarking methods cannot be better realized. the balance

Because the invisibility of digital watermark is affected by factors such as background brightness, texture complexity of background, and spatial frequency of background and digital watermark, and the human visual system has the characteristics of sensitive perception of these information, so it is not combined with the digital image of the human visual system. The watermarking method cannot achieve a better selection of adaptive quantization step size according to the human visual characteristics of different positions of the image information, so it cannot better achieve the balance between the invisibility and robustness of the digital watermarking method

[0011] It can be seen from the above that the DCT-SVD digital watermarking method based on quantization in the prior art cannot select an adaptive quantization step size according to the characteristics of different positions of the image information, and cannot better realize the invisibility and robustness of the digital watermarking method sexual balance

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