An interpolation based steganographic technique with least-significant-bit and pixel value differencing in a pixel block

Over the <span lang="EN-US">past few years, in order to improve hiding capacity and peak signal-to-noise ratio (PSNR) value, several steganographic techniques have been developed. Steganography has become a popular technique transmit secret data through any medium. In image steganography, human eye cannot easily identify hidden which is embedded into image. Small changes are also not detected by eye. High along with high visual quality provided pixel value differencing (PVD) method. This paper first proposes method of interpolation between blocks then applies least-significant-bit (LSB) substitution PVD At starting phase, original fixedto 2x2 block, nearest neighbor (NNI) implemented. next upper left isembedded k-bit LSB data. The newly generated neighbouring measured. Thus, from three directions. Through this using two different range tables, new algorithm proposed. We observed that both cases, PSNR improved.</span>