A three-dimensional grid splitting method of blind watermark

A three-dimensional grid, blind watermarking technology, applied in image data processing, instruments, image data processing, etc., can solve the problems of gap error, lack of alternative grids, not meeting the needs of watermarking, etc.

Inactive Publication Date: 2009-09-16
FUJIAN NORMAL UNIV
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AI Technical Summary

Problems solved by technology

[0007] 2) Lack of alternative meshes with significant geometric features as watermark targets
Applying these existing segmentation algorithms to 3D watermarking, the main problem is that the real segmentation

Method used

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  • A three-dimensional grid splitting method of blind watermark
  • A three-dimensional grid splitting method of blind watermark
  • A three-dimensional grid splitting method of blind watermark

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Embodiment Construction

[0028] We aim to divide the original grid and the attack grid into special blocks similar to the watermark embedding and detection stage. The watermark detection process does not require the original grid except for some additional information. If the watermark grid suffers a slight attack, it is easier to synchronize the similar parts between the original grid and the watermark grid. The attack will cause severe loss of the synchronization segmentation information of the original grid and the watermark grid.

[0029] In the three-dimensional grid segmentation method of blind watermark of the present invention, the watermark embedding process includes the following steps:

[0030] (1) Use NPCA algorithm to process the original model and divide all vertices into plural sets;

[0031] (2) Perform grid segmentation; map the plural sets of vertices into a front view based on the average distance, and select appropriate pixels from the front view as additional information to obtain a s...

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Abstract

The invention relates to a three-dimensional grid splitting method of blind watermark. The process of embedding the watermark comprises the steps of 1) processing an original model using an NPCA algorithm, and separating all peaks into multiple aggregations; 2) splitting the grid, mapping all peak aggregations to be front view, selecting proper pixel from the front view to obtain an additional information sampling view; and 3) embedding the watermark information; the process of extracting the watermark comprises the steps of a) processing an attacked model using the NPCA algorithm; b) extracting the additional information sampling view of the attacked model; c) subtracting the additional information sampling view of the original model by the additional information sampling view of the attacked model, aligning the grid and primarily estimating the spit grid; and d) extracting the watermark. The invention only carries a little information, can synchronously split the attacked model, extracts the watermark without the original model, and can predict the watermark grid splitting boundary with less auxiliary data.

Description

Technical field [0001] The invention relates to a three-dimensional grid segmentation method for blind watermarking. Background technique [0002] In the past ten years, digital watermarking has become an important method for copyright protection and ownership declaration. Most of the applicable digital watermarking technologies mainly focus on traditional data media types such as audio, image and video, and they are widely distributed on the Internet. It was not until a few years ago that scholars began to study 3D watermarking. This is the result of the increasing spread of 3D objects in the fields of architectural design, virtual reality, entertainment, mechanical engineering, and cultural heritage. However, the research on three-dimensional objects is not as deep as the research on images and videos. [0003] The two main requirements of any watermarking algorithm are the robustness and security of the watermark. Robustness requires that the watermark can be detected even if ...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 姚志强孔祥增潘日晶陈丽萍
Owner FUJIAN NORMAL UNIV
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