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Coding and decoding equipment with watermark encrypting

A watermark encryption, encoding and decoding technology, applied in the field of digital video signal compression, can solve problems such as algorithm complexity, achieve the effect of not affecting image quality, strong anti-attack ability, and simple algorithm implementation

Inactive Publication Date: 2007-06-06
ZHEJIANG UNIV
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Problems solved by technology

However, the video system's constraints on the video compression rate will limit the amount of information embedded in the watermark, and the embedding of the watermark will also cause adverse effects on the motion compensation loop in the video decoding system, so the design of this type of algorithm has a certain degree of complexity.

Method used

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  • Coding and decoding equipment with watermark encrypting
  • Coding and decoding equipment with watermark encrypting
  • Coding and decoding equipment with watermark encrypting

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Embodiment Construction

[0024] As shown in Figures 2 and 3, a codec device with watermark encryption is composed of an encoding device and a decoding device. The encoding device includes a watermark generator 210 for generating watermark information and a watermark generator 210 for encoding and embedding watermarks according to the MPEG standard. Encoder 220.

[0025] The decoding device includes a decoder 310 for analyzing the MPEG code stream to extract the watermark and reconstruct a decoded image, and a watermark detector 320 for judging whether the code stream has been tampered with.

[0026] The specific steps of the codec process of the codec device of the present invention are as follows:

[0027] 1) Watermark generator 210 produces watermark information according to the form of embedded watermark, if embedded watermark is logo icon form, then watermark generator 210 produces the yuv data of logo icon; If embedded watermark is encrypted data form (such as macro block DC coefficient), Then t...

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Abstract

A coding / decoding device with watermark encipherment is prepared as forming coding device by watermark generator for generating watermark information and coder for carrying out coding according to MPEG standard and for embedding said watermark on, forming decoding device by decoder for analyzing MPEG code stream to pick watermark up and for restructuring decoded image and watermark detector used for judging whether code stream is distorted or not.

Description

technical field [0001] The invention relates to the fields of digital video signal compression, signal communication and information hiding, and specifically refers to a codec device with high robustness, low complexity and strong concealment watermark encryption. Background technique [0002] With the development of digital multimedia technology, digital products are getting closer to people's lives. Digital multimedia products have the advantages of convenient access, fast transmission, and concise information expression, but they also face problems such as illegal copying, piracy, and malicious tampering. The copyright protection of digital products has attracted more and more people's attention, and digital watermarking is one of the most effective ways to protect copyright. [0003] At present, there are mainly three types of watermark embedding schemes for digital video signals, as shown in Figure 1: [0004] The first type of watermark embedding scheme is to embed w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/167H04N7/26G06T1/00H04N19/44H04N19/467
Inventor 陈耀武郑雅羽黄爱爱
Owner ZHEJIANG UNIV
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