Text zero-watermark based on texture mapping coordinates

In research of copyright protection of digital text, according to the text watermark robustness and weakness of attack resistance, the irregular surface texture mapping strategy has been introduced into text zero-watermark technology, puts forward the method based on texture mapping coordinates of text zero-watermark, and constructs the construction and detection process model, and also designs the core algorithm. First, from the word level, paragraph level and text level, those levels construct the text- curved surface projection model. Then extract the center word coordinates corresponding to the plane and curved surface in the model. Last for the surface coordinates, by using the edge-vertex texture mapping and the interior point harmonic mapping, to get the texture coordinate, and then combine it with plane coordinate to build index to complete text zero-watermark construction and detection. In order to validate the watermark scheme is effectively and feasibly, simulation tests are provided. The experimental results indicate the method has good robustness and strong ability against attack, especially, for the attack toward sentence type conversion, it has more obvious advantages.