Precision-Controlled Reversible Watermarking Algorithm for 3D Model of Oblique Photography
The existing reversible watermarking algorithms for the 3D model of oblique photography can only restore single-pre-cision data,which makes it difficult to meet the needs of different users.This paper proposes a reversible watermarking algo-rithm for 3D model of oblique photography that allows for controlled data precision recovery.Firstly,taking the advantage of the global stability of the mean angle between vertex normals,the feature points and non-feature points are divided for the 3D mod-el.Secondly,each feature point is taken as the center and grouped based on the ratio of its distance to non-feature points.Final-ly,the unique feature point in each group is taken as the origin to construct a spherical coordinate system,with the radius of the coordinate system serving as the carrier of the watermark information.Watermark information is embedded at different positions in the coordinate system.The experimental results show that watermarks can be extracted from different positions to recover data with different precision,so as to achieve controllable precision of data,and have good robustness to conventional attacks on oblique photography 3D models.
3D modeloblique photographyreversible watermarkingcontrolled precisionrobustness
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