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In this article we propose the implementation of a content-aware cross-layer optimization for video streaming in HSDPA networks. The video packets are marked at the IP layer based on the impact on the quality of experience at the application layer. In the core network these packets are mapped onto multiple logical paths with different quality of service accordingly to their marking. The proposed approach...
Unsupervised detection of pan and zoom in soccer sequences allows automatic classification of shots and match analysis. In this work we propose a pan and zoom (both in and out) detector specifically designed for low resolution soccer sequences. Our implementation is based on the analysis of the distribution of the motion vectors, already available in the encoded sequence, among a specific subset of...
Soccer is one of the most streamed video contents over the European mobile networks. However, technical limitations, such as stringent bandwidth constraints and reduced size of the mobile terminal displays, make the delivery of soccer videos with satisfactory quality a challenging task. In this work we propose the optimization of the encoding process by minimizing the bandwidth associated to the audience...
In this article we propose an optimization method for encoding low resolution soccer video sequences. The considered video codec is the state of the art H.264/AVC, as recommended by the 3GPP specifications. The proposed optimization aims at maximizing the user perceived quality, considering the characteristic features of soccer videos. In the typical wide angle shots, about one fourth of each frame...
In this paper we propose a novel sorting mechanism suitable for H.264/AVC NALUs used in applications over UMTS networks. Each packet contains encoded information elements referred to a certain number of MBs. Following the standard, all the encoded information associated to a single MB is stored sequentially. In this work we propose to group the bits referring to a certain information element type...
Incorrectly received packets in low-rate video sequences result in the loss of considerably large picture areas that have to be concealed. The performance of error concealment decreases with the size of the interpolated picture area. The incorrectly received packets may still contain some correct information that can be exploited at the decoder. In this work we propose the utilization of information...
The quality of video streaming in an error-prone environment suffers from packet loss. Since the loss of a packet typically affects a rather large picture area, the performance of error concealment is limited, too. In order to avoid the huge overhead caused by using smaller packet sizes, in this paper we propose and analyze a scheme utilizing the residual redundancy of the encoded video stream. This...
Summary Multimedia transmissions, especially sports transmissions, are an important share of the services offered by mobile network operators. Due to limited capacity, lossy compression codecs have to be used, inducing a significant quality degradation. The quality impairments can particularly be observed in soccer games, when the ball is blurred or even totally disappears at the low-resolution user...
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