Method for generating hologram digital watermarking by appliance computer

A technology for generating holograms and digital watermarks, applied in computing, image data processing, image data processing, etc., can solve problems affecting visual effects

Inactive Publication Date: 2009-07-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly aimed at the robustness of the watermark against geometric attacks, but does not involve the performance of other common attacks such as JPEG compression, noise addition and filtering attacks, and the direct superimposition of watermark information on the approximation sub-image will affect the visual effect

Method used

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  • Method for generating hologram digital watermarking by appliance computer
  • Method for generating hologram digital watermarking by appliance computer
  • Method for generating hologram digital watermarking by appliance computer

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Embodiment Construction

[0043] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0044] 1. The process of embedding digital watermarking:

[0045] 1. Based on the Burch encoding method, use a computer to quickly generate a Fourier transform or a Fresnel computer hologram as a digital watermark.

[0046] (1) Fourier transform computer hologram

[0047] ① Read the digital image I. In order to reduce the dynamic range of the hologram, I first multiplies a random phase factor, that is, multiplies exp[jψ(x, y)] to smooth the Fourier spectrum, which essentially imitates the diffusion of ground glass placed in front of the object in optical holography the effect of light;

[0048] ② Carry out discrete two-dimensional fast Fourier transform (2DFFT) on I, and set the transformation result as:

[0049] f mn =C mn +jD mn (1)

[0050] In the formula, C mn is the real part, D mn is the imaginary part. The amplitude and phase val...

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Abstract

The invention discloses a digital watermarking method for generating a holographic image by applying a computer, which relates to a multimedia signal processing technology. The digital watermarking method for generating the holographic image by applying the computer has relatively good imperceptibility and strong anti-attack performance and is more flexible in calculating the holograph, low in cost and wide in application scope. The step for generating the holographic image by applying the computer serves as a watermark information sequence to be embedded into a carrier image. The steps for embedding the holographic image into the carrier image adopts a watermark embedding algorithm to embed the generated holographic image into the carrier image as the watermark information sequence of the carrier image, to ensure the robustness to various attacks and imperceptibility of a watermark. The step for a watermark detection algorithm is judging whether an image contains the watermark information; and the step for computer generation of the holographic image is generating the content of the watermark extracted on the computer clearly.

Description

technical field [0001] The invention relates to a multimedia signal processing technology, in particular to a digital watermark method using a computer to generate a hologram. Background technique [0002] With the rapid development of multimedia technology and network technology, digital media applications are growing explosively. The original version of unprotected digital media (digital images, videos, etc.) can be edited, modified, copied and distributed without restriction, which poses a challenge to the security authority of digital media and makes the creators of digital media works bear huge burdens. Economic losses. At present, the intellectual property protection and information security issues of digital media are becoming more and more prominent, which is a very important and urgent topic in the digital field. [0003] Digital watermarking technology is a new direction in the field of information security in the mid-1990s. It refers to the use of signal proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李建忠张向苏刘守
Owner XIAMEN UNIV
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