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 in image and signal processing, video and audio processing, multimedia data communication and transmission, and multimedia tools, Multimedia Technology IV will be of interest to academics and professionals involved in the field of multimedia technology.