Method for adding digital watermark to three-dimensional model layout and detecting digital watermark
A three-dimensional model and digital watermarking technology, applied in computing, image data processing, image data processing and other directions, can solve the problems of less research on copyright protection of three-dimensional model design drafts, and achieve the effect of avoiding vertex inconsistency and improving robustness.
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Embodiment 1
[0033] Embodiment 1. This embodiment provides a method for adding a digital watermark to a three-dimensional model design draft, which is characterized in that it includes the following steps;
[0034] Step 1: Obtain the 3D model design draft and read the design data of the 3D model design draft;
[0035] Step two, digital watermark generation, this step includes the following specific steps:
[0036] S2.1, obtain design data; convert the design data and its corresponding timestamp information into watermark information;
[0037] The watermark information includes the header, description of the 3D model design draft, designer information, authorized user information, authorization time information, authorization method, authorization end time, usage times during authorization, reserved bits, and data check bits.
[0038] Information ID Information capacity (unit: bit) Message header2 3D model design draft description16 Designer information8 Authorized user information8 Authori...
Embodiment 2
[0052] Embodiment 2. This embodiment proposes a digital watermark detection method for a 3D model design draft on the basis of Embodiment 1. The 3D model design draft is added according to a method for adding a digital watermark to a 3D model design draft according to Embodiment 1. Digital watermark, the digital watermark detection method includes the following steps:
[0053] Step1, the 3D model design draft needs to be preprocessed before the watermark extraction, that is, the grid relocation is performed. The design draft of the 3D model may have undergone some intentional or unintentional attacks, such as the rotation, translation, zooming of the coordinates of the model design draft, the cutting and smoothing of the model, etc. During the watermark extraction process, repositioning is required to find the original model. The vertex position corresponding to the vertex.
[0054] Reposition the three-dimensional model design draft according to the formula D(P, Q)=d()=min()∈Q.
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