Improved additive spread spectrum watermarking method

A technology for watermarking and watermarking information, applied in the direction of program/content distribution protection, etc., can solve the problem of unsatisfactory decoding performance, and achieve the effect of avoiding decoding errors and improving decoding performance.

Inactive Publication Date: 2017-04-26
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

[0006] Purpose of the present invention: To solve the problem that the decoding performance of the existing ASS watermarking method and its improved method is unsatisfactory, an improved additive spread spectrum watermarking method is proposed

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Embodiment Construction

[0029] Embodiments of the present invention will be further described in detail below in conjunction with specific drawings and examples.

[0030] The programming software used is Matlab 7.0, select figure 1 The gray image of "aircraft" with a size of 1024×768 is shown as the experimental object. Using the improved additive spread spectrum watermarking method, the specific process of embedding the watermark to the original image of the experiment is as follows.

[0031] 1. Divide the "aircraft" gray image into 8×8 pixel blocks, and perform discrete cosine transform (Discrete Cosine Transform, DCT) on these pixel blocks; embed the watermark bit information into the DCT coefficients (except DC coefficients); For every three 8×8 image blocks, 1-bit watermark information is embedded, that is, each bit of watermark information is embedded three times; therefore, it can be calculated that using this embedding method, the image can embed a total of 4096 bits of watermark information...

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Abstract

The present invention relates to an improved additive spread spectrum watermarking method, belonging to the field of multimedia security. Digital watermarking is an important tool for protecting multimedia copyright. The spread spectrum method is the most promising watermarking technology at present. Due to channel noise and main signal interference, existing watermarking algorithms have high bit error rate, failing to meet the requirements. Due to use of a structure characteristic of an Additive Spread Spectrum (ASS) watermarking decoder, a self-adjusting function is introduced to compensate main signal interference. The major innovative content is as follows: the present invention provides an improved ASS watermarking method. The improved ASS watermarking method has the same decoder as a traditional ASS watermarking method. For the noise-free condition, the improved ASS watermarking method generates no error code theoretically. For the noise condition, experiment results show that the improved ASS watermarking method can improve the decoding performance remarkably. The method is applicable to protecting the network platform-based digital multimedia copyright.

Description

technical field [0001] The invention relates to a digital watermarking technology, in particular to a method of spreading the watermarking method. Background technique [0002] In many fields, massive digital images are generated every day, such as military detectives, natural disaster monitoring, traffic monitoring, weather forecasting, e-government, and personal affairs. At the same time, in recent years, the emergence of a large number of various shooting equipment has also accelerated the arrival of the era of big data. The Internet makes the dissemination of multimedia products more convenient. Therefore, the security of image retrieval systems and multimedia becomes very important. Recently, cloud computing has attracted the attention of both academia and industry. With the development of cloud data centers, the security of cloud multimedia has become a hot topic. In order to protect the integrity of video content, researchers use fragile watermarking technology an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/16
CPCG06F21/16
Inventor 张晓强金振超封召
Owner CHINA UNIV OF MINING & TECH
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