Reversible watermarking method for oblique photography three-dimensional models with controllable accuracy
US12073486B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2024 |
| Grant date | Aug 27, 2024 |
| Priority date | — |
| Expiry date | Mar 20, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/764
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosure provides a reversible watermarking method for the oblique photography three-dimensional models with controllable accuracy. According to the disclosure: firstly, by using the global stability of the average included angle of vertex normal vector, the feature points of the oblique photography three-dimensional model are extracted; secondly, the mapping relationship is established by the ratio of the distance between feature points and non-feature points, and the vertexes are grouped, and each group consists of a feature point corresponding to several non-feature points; finally, the spherical coordinate system is constructed by taking the feature points as the coordinate origin in grouping, and the watermark is embedded by modifying the radius of the coordinate system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.