Efficient Algorithms for Editing H.263 and MPEG-4 Videos on Mobile Terminals

With the prevalence of hand-held devices equipped with digital cameras and capable of capturing long videos, there has been a substantial increase in the creation and availability of video content. Most of the video clips that are created are, however, unprofessional in quality. Video editing tools are used to fine-tune, clean and refine the captured video content. While such clips can be edited on PC, it is inconvenient tedious and sometimes impossible to transfer files between mobile device and PC. It is, therefore, more convenient for users to edit their videos on their mobile devices. On the other hand, with the constraints in processing power and memory in hand-held devices, spatial domain editing is not practical. However, compressed domain editing solutions can overcome such limitations. In this paper, we present efficient, compressed domain algorithms for video editing, which when tested on mobile devices, provide significant savings in computations compared to the conventional spatial domain approach.