Z. Tifedjadjine

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Halftone images are often difficult to be processed without causing severe degradation contrary to grayscale images. This gives the purpose to improve many techniques to reconstruct from their corresponding halftones the continuous images that permits a wide range of operations during transmission or processing. The demand for fast image reproduction(More)
In this paper we have proposed digital watermarking scheme for halftone images based on visual cryptography scheme. The scheme does not embed the watermark directly on the halftone image instead watermark will be divided into the parts called as shares. The scheme not only protects the watermark but also provides an effective copyright protection scheme. At(More)
The process of halftoning is usually computationally expensive and algorithms that speed up this process are often desired. This proposes a novel technique in an attempt to improve the speed of the algorithm initially proposed by Murat's and Vaidaynatan. In addition our propose technique is extended to operate on grey-level images halftoning using look up(More)
In this paper, we present a new and simple watermarking algorithm for halftone images. The method is based on the principle of error diffusion techniques for halftoning in order to embed a watermark to by creating a second image (a key type) from the halftone one. The security of this algorithm is guaranteed by the key which is image dependent and contains(More)
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