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In this paper, we show that tensor compression techniques based on randomization and partial observations are very useful for spatial audio object coding. In this application, we aim at transmitting several audio signals called objects from a coder to a decoder. A common strategy is to transmit only the downmix of the objects along some small information permitting reconstruction at the decoder. In...
Although High Dynamic Range (HDR) content can provide an enhanced immersive experience for end-users, the impact of channel errors on its perception is unclear due to the lack of a standardized HDR video distribution framework. This paper presents an assessment of the robustness of the two main HDR video distribution architectures, the single-layer 10-bit scheme and the two-layer 8-bit backward-compatible...
Distributed video coding (DVC) is a video coding paradigm that aims at shifting the complexity from the encoder to the decoder. Most encoding schemes in DVC use a GOP size of 2 or 3 which is fixed and doesn't depend on the video characteristics. In this paper, we propose an architecture that has a unique and simple GOP size control module that results in greater rate-distortion (RD) performance. The...
This paper presents a dynamically reconfigurable architecture for real time video adaptation in order to address different terminals and bandwidths. This architecture is designed to adapt a compressed stream in advanced video coding standard (H264/AVC) using the scalable extension (H264/SVC) with additional refinement in quality transcoding. A low quality and high quality streams requiring different...
An implementation of simultaneous video decoding is described, which is based on a heterogeneous multicore processor. Appropriate task division and assignment to processor cores are explored for efficient execution on the multicore processor. In addition, a set of mechanisms to reduce video decoding complexity is employed, i.e. simplified IDCT, VLD skip, and B-frame skip. Experimental results demonstrate...
in this paper, a new flexible VLSI architecture of H.264/AVC decoder is presented. The proposed design implementation can get a good performance result as fully pipelined construction.
This paper presents the results obtained in the framework of the first part of the French ANR TOSCANE project. This project aims at developing efficient solutions for adaptation of video contents to be delivered over audiovisual networks. We present here a complete transrating scheme for incoming H.264/AVC compressed video bitstreams. The proposed solution is based on frequency selective filtering...
Most of the reported distributed video coding (DVC) architectures have a serious limitation that hinders its practical application. The uses of a feedback channel between the encoder and the decoder require an interactive decoding procedure which is a limitation for applications such as offline processing. On the other hand, the decoder needs an efficient way to estimate the probability of error without...
This paper describes a transcoding algorithm able to transcode a compressed video bitstream into a WMV9 (VC1) compliant bitstream. A Closed-Loop Spatial Domain Transcoding approach, modeled on the Cascaded Pixel Domain Transcoder (CPDT) is presented here. It incorporates reusing of information obtained from the input bitstream. To enhance the performance of the transcoder, an approach for pipelining...
Transcoding is a fast and elegant solution for the adaptation of video content. In the case of bitrate adaptation, an important technique is requantization transcoding. In this paper, we extend our previous work, that focused on requantization of intra-coded pictures, to P and B pictures. We show that by using a combination of techniques, depending on the slice and macroblock type, improved results...
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