A spatial domain steganographic approach using pixel pair differencing and LSB substitution

A new spatial domain steganography method for the grayscale image is presented in this paper. The method has used neighboring pixel pair difference value and Least Significant Bit (LSB) substitution, which provides enhanced embedding capacity. This method uses a 3×3 block structure to divide the cover image into some non-overlapping blocks horizontally. k-LSBs of the center pixel of the cover image block is replaced by k secret bits. The difference value between the neighboring and center pixel value determines the secret bits to be embedded in the pixel pair. Experimental result shows that the suggested method has a higher embedding capacity with good PSNR value of the stego image. Again, this study delivers a comparison of the PSNR value and embedding capacity of the suggested method with the existing methods [4], [6].