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Water print method and device for digital video signal

A digital video and watermarking technology, applied in the direction of digital video signal modification, pulse modulation TV signal transmission, TV, etc., can solve the problems that cannot effectively resist spatial synchronization distortion and photometric distortion, and achieve resistance to time synchronization distortion and photometric distortion Effect

Inactive Publication Date: 2010-05-12
BEIJING FOUNDER ELECTRONICS CO LTD +2
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

It is used to solve the problem that existing schemes in the prior art cannot effectively resist spatial synchronization distortion and photometric distortion

Method used

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  • Water print method and device for digital video signal
  • Water print method and device for digital video signal
  • Water print method and device for digital video signal

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Experimental program
Comparison scheme
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Embodiment Construction

[0073] Through the research on watermarking technology, it can be known that:

[0074] By adjusting the DCT intermediate frequency coefficients to embed the watermark, a better balance can be achieved between the fidelity of the video quality and the robustness of the watermark;

[0075] Watson gives a model of the sensitivity of two-dimensional DCT transform coefficients, and the sensitivity is different for different coefficients. Using this feature, the degree of change of each coefficient can be adaptively adjusted without being noticed by people.

[0076] The close correlation of adjacent video frames along the time axis is the basis for video intelligibility. The stronger the correlation of the video frame, the stronger the correlation of its corresponding intermediate frequency energy, and the smaller the error of mutual prediction. Under the premise of ensuring the fidelity, the intermediate frequency energy of the video frame can be significantly modified, so that t...

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Abstract

The invention relates to an approach and equipment used for watermarking digital video signal. On the premise of ensuring the quality of video, it self-adoptively modulates partial intermediate frequency coefficient of each frame brightness component of video frequency to make the intermediate frequency energy of every frame brightness component of video frequency change obviously to inlay watermark information. Eigenvector is picked up through calculating the intermediate frequency magnitude relationship of adjacent frame's brightness component. It can judge whether watermark is added in thevideo content by using the relationship of the eigenvector and the watermark vector. On the premise of ensuring the quality of video, the invention can resist luminosity distortion, space in-phase distortion and the combination of these two kinds. It also can resist a certain degree of time in-phase distortion.

Description

technical field [0001] The invention relates to the field of digital video processing, more specifically to a method and device for adding a watermark to a digital video signal, and a device for detecting whether the digital video signal is embedded with a watermark. Background technique [0002] With the rapid development of the Internet, the consumer demand for digital video continues to grow, and various copyright issues have become increasingly prominent. Although encryption technology can be used to effectively protect digital content from illegal use during transmission, once the digital content reaches the end user and is legally decrypted, encryption technology cannot provide any protection for it. There is an urgent need for a new technology that can still protect the content of the digital content after it has been decrypted. Digital watermarking technology has the ability to meet these requirements. [0003] As a newest technology of copyright protection, many p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/24G06T1/00H04N19/467
Inventor 杨列森郭宗明
Owner BEIJING FOUNDER ELECTRONICS CO LTD