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Digital video watermark method using kinoform

A technology of digital video and kinoform, applied in digital video signal modification, television, image communication, etc., can solve problems such as blind detection cannot be effectively realized, practical application is difficult, and robustness is weak

Inactive Publication Date: 2013-06-26
HANSHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, this method needs to use a large amount of original video data such as side information in the original key frame when extracting the watermark, so it cannot effectively implement blind detection and is difficult to apply in practice; The IF coefficients are embedded with holographic watermarks, so the robustness against attacks such as H.264 compression, MPEG2 / MPEG4 compression, and frame averaging is weak

Method used

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  • Digital video watermark method using kinoform
  • Digital video watermark method using kinoform
  • Digital video watermark method using kinoform

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Embodiment Construction

[0055] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0056] 1. The process of embedding digital watermarking

[0057] 1. Based on the Gyrator transformation, the computer-made kinoform is used as a digital watermark.

[0058] 1) Read the original watermark image f and multiply it by the random initial phase distribution make up the object surface wavefront function , where π is pi, e is the base of natural logarithm, and (x, y) is the spatial coordinates;

[0059] 2) Perform Gyrator transformation with transformation order α on g(x,y) to obtain transformed spectrum G(u,v):

[0060] G(u,v)=GT α (g(x,y))

[0061] Where α is the transformation order, (u, v) is the spectral domain coordinates;

[0062] 3) Let the amplitude of G(u,v) be constant and keep the phase constant to become the new spectral function G'(u,v):

[0063] G'(u,v)=ξe Φ(u,v)

[0064] where ξ is a constant, Φ(u,v) is the phase fu...

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Abstract

The invention discloses a digital video watermark method using a kinoform and relates to a multimedia signal processing method. The digital video watermark method using the kinoform provided by the invention is high in imperceptibility and can effectively resist various attacks. The method comprises the following steps of: (1) manufacturing the kinoform based on Gyrator conversion by using a computer, wherein the manufactured kinoform serves as a watermark information sequence which is embedded into a carrier video; (2) embedding the kinoform into the carrier video; (3) judging whether a video contains watermark information or not by using a watermark detection algorithm; and (4) reproducing the kinoform on the computer, and particularly, reproducing the contents of an extracted watermark on the computer.

Description

technical field [0001] The invention relates to a multimedia signal processing method, in particular to a digital video watermark method using a kinoform. Background technique [0002] With the rapid development of network technology and computer technology, the transmission, distribution, storage and processing of digital multimedia products (such as images, audio and video, etc.) Convenience; but at the same time, it also leads to serious problems such as piracy and illegal tampering of these information. [0003] As an effective solution to the copyright protection of digital products, digital watermarking technology is a research hotspot in the field of multimedia information security. Because digital video occupies an important position in various multimedia information, video watermarking technology has become an important research topic in the field of information security. In recent years, due to the characteristics of holograms that are encrypted, difficult to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N19/467
Inventor 李建忠肖刚
Owner HANSHAN NORMAL UNIV
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