An effective image steganographic scheme based on wavelet transformation and pattern-based modification

In this paper, a new scheme for image steganography is presented. The proposed scheme has the ability to hide secret message in a digital image. We call the scheme the pattern-based image steganography (PBIS). First, PBIS does discrete wavelet transformation (DWT) on the digital image; separates the transformation result into nonoverlapping blocks, and classifies the wavelet coefficients of these blocks into several patterns. The secret message is embedded into the image by changing the coefficients´ patterns. The performance and reliability of PBIS are shown in the experimental results. The quality of the stego image of the proposed scheme is very close to that of the original one. Moreover, our scheme can be survived under JPEG lossy compression.