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P.S.A. FOR HIDING SCANNED DOCUMENTS WITHIN IMAGES

P.S.A. FOR HIDING SCANNED DOCUMENTS WITHIN IMAGES,Vidyasagar Potdar,Muhammad Adnan Khan,Elizabeth Chang

P.S.A. FOR HIDING SCANNED DOCUMENTS WITHIN IMAGES  
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PSA stands for Pixel Scrambling Algorithm. This algorithm was published early this year (Potdar, Chang 2004). This paper shows a practical application of PSA and how we can hide scanned document within an image. The scanned document could be either hand written or printed. The main idea behind this algorithm is that most scanned documents contain alot of redundant data, which doesn't provide any useful information, e.g. the white background on which the text is written. Therefore, even if we don't hide that information it doesn't make a big difference, and if we only hide the textual portion it would require less space as compared to hiding the complete scanned document. All existing steganographic algorithms hide data in binary format but PSA hides data by directly comparing and manipulating pixels. We also show that even if the scanned document is compressed and hidden it would require more space than required by PSA. Based on implementation and validations we can prove that PSA offers much higher information embedding capacity compared to the other algorithms.
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