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Digital watermarks provide the capability to insert additional information onto various media, such as still images, movies and audio, by utilizing features of the content. Several methods for printed documents have already been proposed using features of the text or images. In order to overcome the disadvantages of existing methods, we have proposed a new information hiding scheme for printed documents;...
Watermark string detection is very useful for document security protection. In we proposed an image based document watermark detection system. In this paper, two major modifications are made based on the previous system.First, a trinary image mosaicing algorithm is proposed to merge the broken watermark string images into a high quality mosaic image. Second, we relax the conditions in the Maximum...
In this paper, we describe our dot-pattern code, which can embed information onto the paper. Its main features are 1) no need to reserve a special room for the code, 2) obscure and unnoticeable, 3) comparatively large information capacity, 4) the absolute coordinates in the paper is measurable. We describe how to embed and detect the information onto / from the paper, and we estimate it by examination...
A method for enhancing the image quality of watermarked binary images containing text, drawings, graphs and tables is described. Using the proposed method, we can construct binary watermarking methods that do not perceptually degrade image quality and are robust against image deformation. The method can enhance image quality by accurately detecting the gaps created by the conventional watermarking...
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