Video adaptation for mobile digital television

Abstract

Abstract-Mobile digital television is one of the new services introduced recently by telecommunications operators in the market. Due to the possibilities of personalization and interaction provided, together with the increasing demand of this type of portable services, it would be expected to be a successful technology in near future. Video contents stored and transmitted over the networks deployed to provide mobile digital television need to be compressed to reduce the resources required. The compression scheme chosen by the great majority of these networks is H.264/AVC. Compressed video bitstreams have to be adapted to heterogeneous networks and a wide range of terminals. To deal with this problem scalable video coding schemes were proposed and standardized providing temporal, spatial and quality scalability using layers within the encoded bitstream. Because existing H.264/AVC contents cannot benefit from scalability tools, efficient techniques for migration of singlelayer to scalable contents are desirable for supporting these mobile digital television systems. This paper proposes a technique to convert from single-layer H.264/AVC bitstream to a scalable bitstream with temporal scalability. Applying this approach, a reduction of 60% of coding complexity is achieved while maintaining the coding efficiency.

Temporal scalable mobile video communications based on an improved WZ-to-SVC transcoder

“…The method presented was applied in the baseline profile and reused information from the mode decision and ME processes from the H.264/AVC stream. In the same year, Garrido-Cantos et al [11] presented an H.264/AVC to SVC video transcoder that efficiently reuses some motion information from the H.264/AVC decoding process in order to reduce the time consumption of the SVC encoding algorithm by reducing the ME process time. The approach was developed for main profile and dynamically adapted for several temporal layers [11].…”

A low-complexity closed-loop H.264/AVC to quality-scalable SVC transcoder

“…Temporal H.264/AVC-to-SVC transcoding has been considered in [2], while spatial transcoding has been investigated in [3]. For quality scalability, coarse-grain scalability (CGS) and medium-grain scalability (MGS) can be used.…”

“…To have a common ground of comparison, only techniques are considered which are able to transcode towards a quality scalable bitstream. Consequently, we will not compare our system with [2] and [3] since these techniques do not provide such a fine granularity of the rate points of the resulting SVC bitstream.…”