Reversible Data Hiding by Histogram Modification for Image Contrast Enhancement
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چکیده
© 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 761 REVERSIBLE DATA HIDING BY HISTOGRAM MODIFICATION FOR IMAGE CONTRAST ENHANCEMENT Silpa Rajan1, Minu Lalitha Madhavu2 1Silpa Rajan, Pursuing Mtech at Sree Buddha college of Engineering , Pattoor, Kerala, India 2Minu Lalitha Madhavu , Assistant Professor , Dept. of Computer Science Engineering, Sree Buddha College , Pattoor, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Security is vital while transferring data over the network. The data is hidden in the encrypted image for the purpose of improving security.. This in turn improves the confidentiality of the data. The data embedded can be extracted without any error, and also the cover image can be restored with error free. This type of technique is termed as Reversible Data Hiding (RDH). We are conducting a survey in this paper based on different RDH techniques, where the original image can be recovered without any loss. If combine both lossless and RDH techniques, one part of data can be extracted before image encryption and another part can be extracted after encryption.
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