Improved Quality of Image Steganography Using POLPA
|T.V.S. Gowtham Prasad1 Dr. S. Varadarajan2 T. Ravi Kumar Naidu3
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In the modern steganography, even if hidden information is unable to reveal, its existence changes the statistical properties of the cover media which leads to distortions in the cover media. Distortions in the cover media will make the job of eavesdropper easier to determine whether steganography has been used or not !. As the payload capacity of secret information increases, the distortion in the cover media rises. This breaks the very significance of steganography. In this paper a new approach called Polynomial Based Optimal LSB Pixel Adjustment (POLPA) is implemented to achieve image steganography. This approach improves the payload capacity of the secret information and maximizes the quality of the stegoimage statistically and perceptually. The proposed method is compared with Least Significant Bit insertion and DCT steganography methods over JPEG and BMP image formats. The quality of the steganography measured based on PSNR, Normalized Cross Correlation Error, Universal Image Quality Index (UIQI), Structural Similarity Index Metric (SSIM).