International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
REVERSIBLE IMAGE DATA HIDING WITH CONTRAST ENHANCEMENT Pratima B. Choudhari1, Mr. M. S. Sadavarte2 1M.Tech
student, Electronics and Telecommunication Engineering, Government College of Engineering, Jalgaon, Maharashtra, India 2Professor in Electronics and Telecommunication Engineering, Government College of Engineering, Jalgaon, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------based and in some cases it is desired that communication Abstract - Digital communication has become an essential
be made secret. Consequently, the security of messages has become a fundamental issue. The techniques is available to achieve this goal is Reversible data hiding technique , the message is transformed into some other form and then the embedded message is transmitted. In reversible data hiding , the data is embedded in a cover file and the cover file is transmitted. This paper proposed a system that combines the effect of these two methods to enhance the security of the data This proposed system' embeds the data with a RDH algorithm and then embeds the secrete data in a cover file. The cover carrier is an image. To evaluate the performance of a RDH algorithm, the hiding rate and the marked image quality are important metrics. There exists a trade-off between them because increasing the hiding rate often causes more distortion in image content. To measure the distortion, the peak signalto-noise ratio (PSNR) value of modification of image histogram provides less embedding capacity. In contrast, the more recent algorithms manipulate the more centrally distributed prediction errors by exploiting the correlations between neighboring pixels so that less distortion is caused by data hiding. Although the PSNR of a marked image generated with a prediction error based algorithm is kept high, the visual quality can hardly be improved because more or less distortion has been introduced by the embedding operations. For the images acquired with poor illumination, improving the visual quality is more important than keeping the PSNR value high. Moreover, contrast enhancement of medical or satellite images is desired to show the details for visual inspection.
part of infrastructure nowadays, a lot of applications are Internet based and in some cases it is desired that communication be made secret. Consequently, the security of messages has become a fundamental issue. The existing system such as the Difference Expansion and Expansion Embedding are most commonly used techniques but suffers from undesirable distortion which makes these methods unsuitable or less reliable. The techniques used in proposed system is to achieve Reversible data hiding. The message is embedded into cover image and then the cover image is transmitted. In proposed system one first contribution is a histogram shifting modulation which adaptively takes care of the local specificities of the image content. By applying it to the image prediction-errors and by considering their immediate neighborhood, the scheme we propose inserts data in textured areas where other methods fail to do so. This method inserts the payload in the textured area and thus reduces the distortion and it also increases the embedding capacity of the cover image. In that way, the message embedder and extractor remain synchronized for message extraction and image reconstruction. After extraction of message from the image proposed system chieve a peak signal-to-noise ratio (PSNR) of about 1–2 dB greater than the original image. Key Words: Reversible Data Hiding, Histogram Shifting, Peak Signal to Noise Ratio, Mean Squared Error.
1. INTRODUCTION Reversible Data Hiding (RDH) has been intensively studied in the community of signal processing. Also referred as invertible or lossless data hiding, RDH is to embed a piece of information into a host signal to generate the marked one, from which the original signal can be exactly recovered after extracting the embedded data. The technique of RDH is useful in some sensitive applications where no permanent change is allowed on the host signal. In the literature, most of the proposed algorithms are for digital images to embed invisible data or a visible watermark. Digital communication has become an essential part of infrastructure nowadays, a lot of applications are Internet
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2. LITERATURE REVIEW Up till now more work or research has been done in reversible data hiding techniques. Lots of efficient techniques are proposed till. The work done in reversible data hiding techniques are as follows: We know it is very difficult to vacate the room losslessly from encrypted images. So by considering this in [2] Kede Ma, Weiming Zhang, Xianfeng Zhao, Nenghai Yu and Fenghua Li has proposed a technique for embedding the data in reversible manner using reserve room before encryption.Vacating room from the encrypted images
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