Lossless Information Hiding in Images

1.4. Overview of Information Hiding Techniques for Images

In this section, we provide an overview the information hiding techniques for images. That is, the cover object is a digital image, and after we embed the secret information into the cover image, we can get the stego image. According to different purposes and applications, we can mainly classify information hiding techniques into four categories, i.e., robust watermarking for copyright protection, fragile watermarking for content authentication, fingerprinting for transaction tracking, and steganography for covert communication. For these four categories, we do not care regarding the recoverability of the cover image after extracting the secret information in the stego image. For some areas, ...