International Journal of Information and Electronics Engineering
Pixel Value Differencing (PVD) is a steganography method which embeds secret data in images based on spatial information. And to improve the capacity of hiding data is increased by using Tri-Pixel Difference Value (TPVD) method. In which data is hidden in 2X2 square block. Here proposed method improves the security of existing TPVD method by making certain modification to make it to more robust to histogram quantization. But it reduces certain capacity of original TPVD algorithm. And the stability of against histogram quantization is significantly improved.