Abstract
In a color image every pixel value composed of red, green and blue component and each of which ranges from 0 to 255 in case of 8-bit representation. In this paper, we have used pixel value differencing (PVD) method for secret data embedding in each of the component of a pixel in a color image. But when we use pixel-value differencing (PVD) method as image steganographic scheme, the pixel values in the stegoimage may exceed the range 0~255. We have eliminated this overflow problem of each component pixel. Furthermore for providing more security, we have used different number of bits in different pixel components. It would be very difficult to trace how many bits are embedded in a pixel of the stego image. From the experiments it is seen that the results obtained in proposed method provides better visual quality of stego-image compared to the PVD method.
Highlights
Security measures have become very necessary issue in the age of digital transmission of information via Internet
We have shown the management of pixel value range for a gray scale cover image, where the capacity remains same with original pixel value differencing (PVD) method
The Peak-Signal-to-Noise ratio (PSNR) value and payload capacity of each stego-image is given as average value by executing 100 rounds using standard digital images where the hidden information are different
Summary
Other way is steganography which is a technique of hiding secret information into a cover media or carrier. If the cover media is a digital image, it is called cover image and the cover image with hidden data is called stego-image. There are various steganographic techniques available where a digital image is used as a carrier. The most common and simplest method is least-significant-bit (LSB) substitution, where the LSB position of each pixel of the cover image is replaced by one bit of secret data. Wang et al.[7] proposed a method to embed data by using genetic algorithm to improve the quality of the stego-image. Wu and Tsai[1] proposed a new scheme to hide more data with outstanding quality of stego-image pixel-
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