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Wove paper, made on a papermaking screen or mold having a surface of smooth tightly woven wires, was the predominant paper type used for printing in the twentieth century. To aid in the study and classification of fine art prints on wove paper, the present work compares the results of five different image processing approaches for characterizing surface texture. Using a collection of popular wove...
Advancement of technology over the recent past has led to an increase in circulation of counterfeit notes in today's economy. To combat this issue, it is essential that there exists an efficient mechanism to detect fake banknotes. The main problem with current systems is the trade-off between speed and complexity. This paper proposes a system that can classify and subsequently verify Indian paper...
The rapid growth in information and communication technologies provides ways for some people to forge printed documents. Digital watermarking is widely used for authenticating digital documents. By embedding some watermarks in the printed documents in a way not to be observed by human eyes we may stop these forgeries. While a printed document requires another procedure to extract the embedded watermark...
A method to hide information into pictures in certificate that achieve robustness against printing and scanning is proposed. Aiming at three main distortions during the process of certificate manufacture, use and verification, the prediction error filter used in spatial watermarking. A kind of naturally robust watermark pattern is applied to resisting the local and small nonlinear distortion. The...
In recent years, a lot of research has been conducted into watermarking for the purpose of protecting the copyright of a variety of electronic content. Very recently, watermarking methods that resist analog conversion, such as that for printing, have been studied and systems have been proposed that provide instructions for converting from analog to digital data, such as those for mobile telephones...
Halftone image watermarking techniques that allow automated extraction of the embedded watermark data are useful in a variety of document security and workflow applications. The print-scan process inherent in these applications introduces distortions whose characteristics exhibit a strong spatial dependence on the cover image in which the data is embedded. In this paper, we demonstrate that a characterization...
In general, a duplicated or tampered one of document can be obtained by duplicating machine. How to distinguish watermark quality from the first printing document and the duplicated or tampered one? In this paper we introduce a document watermarking arithmetic which is robust to copying. The arithmetic is based on the FMT transformation. The document is regarded as one image and is embedded 8 digitals...
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