Multimedia Technology IV is a collection of papers from the 4th International Conference on Multimedia Technology (ICMT 2015, Sydney, Australia, 28-29 March 2015). The book discusses a wide range of topics, including: - Image and signal processing - Video and audio processing - Multimedia data communication and transmission, and - Multimedia tools. Presenting recent advances, and new techniques and applications, the contributions will be of interest to academics and professionals involved in the field of multimedia technology.