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Geometric attack resistant light field image multiple reversible robust watermark processing method and system

An anti-geometric attack, light field image technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as difficulty, inability to restore original images, copyright protection of complex light field images, etc., to achieve good imperceptibility and Robustness, the effect of improving the ability to resist various attacks, and improving the ability to resist geometric attacks

Pending Publication Date: 2022-07-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complex structure also makes copyright protection of light field images difficult
At present, there are few watermarking schemes suitable for light field images, most of which cannot restore the original image after embedding watermark information
In addition, geometric attacks are still an unsolved problem in the field of light field image watermarking

Method used

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  • Geometric attack resistant light field image multiple reversible robust watermark processing method and system
  • Geometric attack resistant light field image multiple reversible robust watermark processing method and system
  • Geometric attack resistant light field image multiple reversible robust watermark processing method and system

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Embodiment approach

[0052] Embodiments of the invention and features of the embodiments may be combined with each other without conflict.

[0053] Terminology Explanation:

[0054] polar harmonic Fourier moments (PHFMs);

[0055] Quaternion polar harmonic Fourier moments (quaternion polar harmonic Fourier moments, QPHFMs);

[0056] Reversible data hiding;

[0057] Code division multiplexing (Code division multiplexing, CDM).

[0058] The light field image f represented by the biplane model L (u, v, s, t) contains four dimensions, which is inconvenient to describe the light field image through a two-dimensional image. Usually, the method of projecting the four-dimensional light field to a two-dimensional image is used to visualize the light field image. In the process, two description methods of macro-pixel image and sub-aperture image are used.

[0059] The biplane model of the light field represents the position and direction of the light by recording the coordinate information of the light p...

Embodiment 1

[0096] This embodiment discloses a multi-reversible robust watermark processing method for light field images that is resistant to geometric attacks;

[0097] like figure 1 Shown, a multi-reversible robust watermarking method for light field images resistant to geometric attacks, including:

[0098] S1: Obtain the original 4D light field image and watermark information to be processed, and preprocess the light field image to obtain a macro pixel image;

[0099] Assume the original 4D light field image f L The size of is U×V×S×T, and the watermark information W is a binary image of size P×Q.

[0100] Calculate the image hash of the original 4D light field image for the subsequent reversible embedding process to verify the consistency of the restored image. Convert the original 4D light field image to a light field macro pixel image f M , for the embedding of multiple robust watermarks.

[0101] S2: Embed the watermark information into multiple positions in the macro-pixel ...

Embodiment 2

[0175] This embodiment discloses a multi-reversible robust watermark processing system for light field images that resists geometric attacks;

[0176] like Figure 4 As shown in the figure, the multi-reversible robust watermarking processing system for light field images against geometric attacks includes an image preprocessing module, a macro-pixel image watermark embedding module, and a sub-aperture image information embedding module;

[0177] The image preprocessing module is configured to: obtain the original 4D light field image and watermark information to be processed, and preprocess the light field image to obtain a macro pixel image;

[0178] The macro-pixel image watermark embedding module is configured to: embed watermark information in multiple positions in the macro-pixel image to obtain a watermarked macro-pixel image;

[0179] The sub-aperture image information embedding module is configured to: convert the watermarked macro-pixel image into a water-marked ligh...

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Abstract

The invention provides a geometric attack resistant light field image multiple reversible robust watermark processing method and system, and the method comprises the steps: obtaining a to-be-processed original 4D light field image and watermark information, carrying out the preprocessing of the light field image, and obtaining a macro pixel image; embedding the watermark information into a plurality of positions in the macro pixel image to obtain a macro pixel image containing a watermark; converting the macro pixel image containing the watermark into a light field sub-aperture image containing the watermark, and reversibly embedding information loss caused by embedding the watermark into the macro pixel image into the light field sub-aperture image containing the watermark to obtain a final 4D reversible robust watermark light field image; according to the method, the watermarks are embedded into the multiple positions of the light field macro-pixel image, information loss caused by embedding the watermarks into the light field macro-pixel image is reversibly embedded into the light field sub-aperture image, the capacity of resisting geometric attacks is improved, and good imperceptibility and robustness are achieved.

Description

technical field [0001] The invention belongs to the technical field of digital watermarking, and in particular relates to a method and system for multi-reversible robust watermarking processing of light field images against geometric attacks. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Light field images contain rich visual information and have wider application scenarios than traditional images. However, the complex structure also makes copyright protection of light field images difficult. At present, there are few watermarking schemes suitable for light field images, and most schemes cannot restore the original image after embedding the watermark information. Furthermore, geometric attacks are still an unsolved problem in the field of light-field image watermarking. SUMMARY OF THE INVENTION [0004] In order to overcome the abov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06F21/16
CPCG06T1/0071G06T1/0064G06F21/16
Inventor 王春鹏张清华马宾夏之秋张强王晓雨李琦李健韩冰
Owner QILU UNIV OF TECH
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