Deadweight tonnage (DWT) domain-based digital watermark method and system

A digital watermarking and watermarking technology, which is applied in the field of information hiding in communication, can solve the problems of incomplete realization of gray-scale blind watermarking color images, etc., and achieve the effect of ensuring concealment, security and improving stability

Active Publication Date: 2012-06-13
ENJOYOR COMPANY LIMITED +2
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Problems solved by technology

However, these methods all have certain defects, and often only one or two of them can be con

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  • Deadweight tonnage (DWT) domain-based digital watermark method and system
  • Deadweight tonnage (DWT) domain-based digital watermark method and system
  • Deadweight tonnage (DWT) domain-based digital watermark method and system

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] Please refer to figure 1 , figure 2 As shown, the digital watermarking method based on the DWT domain of the present invention includes watermark embedding and watermark extraction. Among them, the watermark embedding process is: convert the original color image to YUV color space, perform the second wavelet transform on the Y component, and then perform inverse preprocessing on the grayscale watermark image, and then save the wavelet transform coefficients through the difference , encrypt and arrange the diagonal subband coefficients of the second wavelet transform that replaces the Y co...

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Abstract

The invention discloses a deadweight tonnage (DWT) domain-based digital watermark method. A watermark embedding process comprises the following steps that: inverse pretreatment of a gray-scale watermark image; luminance-bandwidth-chrominance (YUV) color space conversion of an original colorful image; wavelet secondary transformation of weight Y; wavelet transformation of gray-scale watermark image; difference value storage of watermark image wavelet coefficient; encryption arrangement of watermark image wavelet coefficient; insertion of watermark image wavelet coefficient and inverse coefficient; and wavelet inverse transformation of inserted watermark image; and the watermark extraction process comprises the following steps that: YUV color space conversion of the inserted watermark image; wavelet secondary transformation of weight Y of the inserted watermark image; wavelet coefficient restoration of the gray-scale watermark image according to the encryption arrangement of the gray-scale watermark image; all-zero compensation of a gray-scale watermark image wavelet coefficient diagonal band; and wavelet coefficient inverse transformation of the gray-scale watermark image. Due to the adoption of the method and the system, the invisibility of a watermark can be guaranteed, and good robustness on the attacks such as compression, noise plus and filtering of a joint photographic experts group (JPEG) can be realized.

Description

technical field [0001] The invention belongs to the technical field of information hiding in communication, and relates to a digital watermarking method and system based on a DWT domain. Background technique [0002] Digital watermarking technology is a technology that embeds some identification information directly into the digital carrier without affecting the use value of the original carrier, and is not easy to be detected and modified again, but can be recognized and identified by the producer. The information hidden in the carrier can be used to confirm content creators, buyers, transmit confidential information, or determine whether the carrier has been tampered with, etc. Digital watermarking is an important research direction of information hiding technology and an important branch of information hiding technology research field. [0003] In recent years, with the development of the digital age, more and more information materials are stored and transmitted in digi...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 阮啸宙王辉吴越方路平钱小鸿杜克林柳展周勇
Owner ENJOYOR COMPANY LIMITED
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