Ari Hourunranta

• Group Leader at Nokia Technologies

A work-in-progress standard-powered media processing system is presented to demonstrate a full end-to-end interactive media service for an immersive user experience. The system converts traditional 360° videos to the Omnidirectional MediA Format (OMAF) standard-compliant format. Media processing, in general, demands complex and tailored workflows f...

For video applications, tiled streaming is a popular way to deliver viewport dependent 360-degree video. Unfortunately, dynamic adaptation to network bandwidth fluctuations of such video streams is still a challenge. This paper proposes a method for managing in a controlled way the graceful quality degradation in DASH-based streaming systems to del...

Omnidirectional MediA Format (OMAF) is a media standard for 360° media content developed by the Moving Picture Experts Group (MPEG). More complex and tailored multimedia services are needed for advanced media processing and delivery such as virtual reality content stitching, packaging, and adaptive streaming. To achieve the desired result, these co...

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 captur...

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 proc...

This paper presents the error concealment (EC) feature implemented by the authors in the test model of the draft ITU-T video coding standard H.26L. The selected EC algorithms are based on weighted pixel value averaging for INTRA. pictures and boundary-matching-based motion vector recovery for INTER pictures. The specific concealment strategy and so...

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 visu...