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Method for embedding digital watermark

A digital watermarking and watermarking technology, applied in the direction of image data processing, image data processing, color TV parts, etc., can solve the problems of embedded formula and wavelet decomposition that are still blank

Inactive Publication Date: 2004-05-05
SUN YAT SEN UNIV
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Problems solved by technology

But in the DWT domain, the research in this area has not been reported, and the research on the embedded formula and the series of wavelet decomposition is still blank

Method used

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  • Method for embedding digital watermark
  • Method for embedding digital watermark
  • Method for embedding digital watermark

Examples

Experimental program
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Effect test

Embodiment Construction

[0044] figure 1 In, wavelet decomposition is performed on the input image to generate LH j 、HL j 、HH j Three high band series, one LL 3 Low frequency band (when three-level decomposition).

[0045] figure 2 Among them, (a) is using LL 3 Watermark image embedded with watermark; (b) is using HL 3 The watermarked image that embeds the watermark. Under the exact same conditions, when the PSNR is 44.4dB, the watermark in the first case of "Lena" is invisible, but the watermark in the second case is clearly visible, indicating that the low-frequency coefficients have a larger sensory capacity.

[0046] image 3 Among them, (a) is the comparison of anti-JPEG compression performance; (b) is the comparison of anti-Gaussian noise performance. The vertical axis represents the watermark W extracted from the distorted watermark image * The similarity with the original watermark W. image 3 It shows that the coefficient embedded watermark in low frequency band is better than tha...

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Abstract

The digital wat remark technique based on a wavelet transform is a method for protecting multi media video data, belonging to the multi media signal processing area. First, number of stages of analyzed wavelet is selected, and the multi media data are analyzed by use of the wavelet transform. Then, some of the wavelet coefficients are selected. The watermark is embedded in the domain of the wavelet transform. Finally, the video data with the watermark embedded are obtained through the inverse wavelet transform. Naked eyes can not distinguish between the original video data and the video data with the watermark embedded. The digital watermark provides a means for distinguishing the said problem. The watermark can be any meaningful digital file or meaningless random series. The invention protects video data or files transferred on networks.

Description

Technical field: [0001] The invention relates to a digital watermark technology based on wavelet transform, is a multimedia data protection method, and belongs to the field of multimedia signal processing. technical background: [0002] Digital media has some incomparable advantages over analog media, such as high-quality digital signals, easy editing and processing, undistorted copying, easy transmission and distribution through electronic (network) or physical (CD-ROM) systems at low cost and high efficiency, etc. . These advantages make the technical development and application of digital media (digital audio, digital image, digital video) develop rapidly in recent years. However, it is precisely because of these advantages that there is a potential threat to the rights and interests of the original owners of the media: the results of their hard work may be perfectly copied in large numbers overnight for free and spread to every corner of the world. Therefore, the copyr...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T2201/0052G06T1/0028
Inventor 刘九芬黄达人黄继武
Owner SUN YAT SEN UNIV
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