A High Quality Steganographic Scheme for ROI Images

This paper proposes a data hiding with high visual quality in stego-images so that malicious invaders are hardly aware of the existence of the embedded message. Due to high visual quality and good embedding capacity, we also apply our scheme with region of importance (ROI) for protecting the important part of an image. The overload, location map of ROI, is compressed with run length encoding (RLE). By slightly extending the rim of ROI in the location map to avoid modifying the corresponding pixels in the ROI of the original image, the integrity of the important region can be protected and maintained. Compared with Wang et al.´s scheme, our proposed scheme has higher embedding capacity and better peak signal-to-noise ratio (PSNR) values.