New Watermarking Scheme and Centroid Detecting Method for Text Documents
Huang Hua，Qi Chun,Li Jun,Zhu Weifang
(Image Processing Center,Xi'an Jiaotong University,Xi'an 710049,China)

Abstract: Considering the feature of Chinese text, the marking scheme of line shifting and the centroid detecting method which are all based on space domain are improved and simplified, and a new marking scheme and relevant centroid detecting method are given. The new marking scheme can offer two times marking spaces than the old one does, because the new scheme gives up the use of control lines. The centroid noise model is magnified and the detection method is simplified, so the computation load is greatly reduced. The new scheme only needs to detect the relative distances of each line's centroid, in this way, it can realize blind detection. Experimental results show that the accuracy of improved method can achieve over 95%.
Keywords: watermarking;image of text documents;image processing;binary image