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Nowadays, the transmission, storage and processing for multimedia data have been increasingly performed with ease due to the advancements of the technologies of Internet and cloud computing. The fact that multimedia data, especially digital images, can be easily copied, modified or tampered has led to the development of watermarking and forensics image processing techniques. Considering that the ownership and copyright of digital images may be impinged and confused due to such attacks, it is necessary to ensure that digital images which are received or downloaded are not faked. Hence, the techniques of image watermarking and forensics have been developed to overcome the deficiency of traditional cryptography for the scenario of image protection, which are becoming increasingly important and attracting the public attention. There are still some notable disadvantages in current research methodologies for image watermarking and forensics, which are commonly based on the strict conditions that are not possible to satisfy for real-time applications. Furthermore, high computational complexity of current schemes makes it difficult to cope with big data in computer networks and cloud computing. These drawbacks limit the applications of image watermarking and forensics techniques in practice, and thus requiring in-depth investigations and studies. This special issue aims to bring together the latest research works in the related areas of real-time image watermarking and forensics. It addresses novel and efficient techniques that have potential to be applied to cloud computing with privacy preserving. According to a rigorous review procedure, each manuscript submitted to the special issue was reviewed by at least three anonymous experts. Based on the reviews done, a total of 21 papers have been selected to be included in this special issue, which fall into the following five major categories: (1) watermarking and steganography (5 papers), (2) steganalysis (3 papers), (3) reversible data hiding (5 papers), (4) image forensics (3 papers), (5) image encryption (2 papers), and (6) other emerging techniques (3 papers). In what follows, an overview of these papers is provided.

Special issue on real-time image watermarking and forensics in cloud computing