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International Journal of Image, Graphics and Signal Processing(IJIGSP)

ISSN: 2074-9074 (Print), ISSN: 2074-9082 (Online)

Published By: MECS Press

IJIGSP Vol.7, No.4, Mar. 2015

A Modified Pixel-Value Differencing Image Steganographic Scheme with Least Significant Bit Substitution Method

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Author(s)

Aruna Malik, Geeta Sikka, Harsh Kumar Verma

Index Terms

Pixel value differencing;least significant bit;cover image;stego image;peak signal-to-noise ratio

Abstract

Pixel value differencing is a steganographic technique for gray scaled images. In this paper, we propose a modified pixel value differencing image steganographic scheme with least significant bit substitution method. Our method divides the cover image into the blocks of two consecutive pixels and calculates the absolute difference between the pixels of a block similar to [1, 2]. If the difference is less than a particular threshold, i.e. 15 (in this paper) than 4 bits of secret data are taken and these bits are embedded onto the LSBs of the block's pixels through least significant bit substitution method otherwise the number of bits to be hidden are selected based on some characteristics of the block and hidden. The experimental results show that our method significantly improves the quality of stego image as compared to the [1, 3] and have sufficient payload.

Cite This Paper

Aruna Malik, Geeta Sikka, Harsh Kumar Verma,"A Modified Pixel-Value Differencing Image Steganographic Scheme with Least Significant Bit Substitution Method", IJIGSP, vol.7, no.4, pp. 68-74, 2015.DOI: 10.5815/ijigsp.2015.04.08

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