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

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...

AI Technical Summary

Problems solved by technology

However, these methods all have certain defects, and often only one or two of them can be considered, and the color image of the gray-scale blind watermark cannot be completely realized.

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