Mathias Wien

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This paper provides a performance analysis of the Scalable Video Coding (SVC) extension of H.264/AVC. A short overview presenting the main functionalities of SVC is given and main issues in encoder control and bit stream extraction are outlined. Some aspects of rate-distortion optimization in the context of SVC are discussed and strategies for derivation of(More)
A concept for variable block-size transform coding is presented. It is called adaptive block-size transforms (ABT) and was proposed for coding of high resolution and interlaced video in the emerging video coding standard H.264/AVC. The basic idea of inter ABT is to align the block size used for transform coding of the prediction error to the block size used(More)
In this paper, a decoder side motion vector derivation scheme for inter frame video coding is proposed. Using a template matching algorithm, motion information is derived at the decoder instead of explicitly coding the information into the bitstream. Based on Lagrangian rate-distortion optimisation, the encoder locally signals whether motion derivation or(More)
This paper presents the integration of Scalable Video Coding (SVC) into a generic platform for multimedia adaptation. The platform provides a full MPEG-21 chain including server, adaptation nodes, and clients. An efficient adaptation framework using SVC and MPEG-21 Digital Item Adaptation (DIA) is integrated and it is shown that SVC can seamlessly be(More)
In recent years, video applications on handheld devices became more and more popular. Due to limited computational capability and power supply in handheld devices, rate-complexity-distortion optimization (RCDO) algorithms at encoder side draw increasing attention. The target of RCDO is to obtain the best rate-distortion (R-D) performance under a constraint(More)
Efficient intra prediction is an important aspect of video coding with high compression efficiency. H.264/AVC applies directional prediction from neighboring pixels on an adjustable block size for local decorrelation. In this paper, we present an extended prediction scheme in the context of H.264/AVC that comprises two additional prediction methods(More)
This contribution presents results of the MPEG verification test that was carried out for the new Scalable Video Coding (SVC) Amendment of H.264/AVC. The test consisted of a series of subjective comparisons of SVC and single layer H.264/AVC coding for different application scenarios including conversational applications, broadcasting over mobile channels,(More)