Ari Hourunranta

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.

QoS of mobile videophones in HSCSD networks

This paper is a contribution to studying the feasibility of multimedia applications over GSM HSCSD networks. We report simulation results of a mobile videophone application at bit rates ranging from 14.4 to 57.6 kbit/s. We focus on QoS of video data in both mobile-to-land and mobile-to-mobile H.324 connections. The results obtained in terms of visual quality, received PSNR, delay, and frame rate are promising, especially at bit rates of 28.8 kbit/s or higher.

Video and Audio Editing for Mobile Applications

Video content creation and consumption have been increasingly available for the masses with the emergence of handheld devices capable of shooting, downloading, and playing videos. Video editing is a natural and necessary operation that is most commonly employed by users for finalizing and organizing their video content. With the constraints in processing power and memory, conventional spatial domain video editing is not a solution for mobile applications. In this paper, we present a complete video editing system for efficiently editing video content on mobile phones using compressed domain editing algorithms. A critical factor from usability point of view is the processing speed of the editing application. We show that with the proposed compressed domain editing system, typical video editing operations can be performed much faster than real-time on todays S60 phones