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Recent MPEG video compression standards are still block-based: blocks of pixels are sequentially coded using spatial or temporal prediction schemes. For each block, a vector of coding parameters has to be selected. In order to limit the complexity of this decision, independence between blocks is assumed, and coding parameters are locally optimized to maximize the coding efficiency. Few studies have...
The scalable video coding enables to compress video contents into a hierarchical layered representation, each layer depicts an enhanced version of the underlying layer. SHVC is the scalable extension of HEVC and enables spatial, SNR, color-gamut, codec and bitdepth scalability. It has been proved, in the MPEG investigations prior to the recent Call for Evidence, that SHVC can support SDR-to-HDR scalability...
Scalable video coding consists in compressing the video sequence into a layered bitstream where each layer refers to different spatial, temporal or quality representation of the video. Scalability enables compression gain compared to the simulcast encoding of layers thanks to inter-layer predictions. The scalable HEVC extension (SHVC) is the latest scalable technology promising up to 30% bitrate gains...
In this paper we investigate a selective video encryption in the scalable HEVC extension (SHVC). The SHVC extension encodes the video in several layers corresponding to different spatial and quality representations of the video. We propose a selective encryption solution using a chaotic-based encryption system. The proposed solution encrypts a set of sensitive parameters with a minimum complexity...
This paper presents the first 4Kp30 end-to-end video streaming demonstration based on the upcoming Scalable High efficiency Video Coding (SHVC) standard. The optimized and parallel SHVC decoder is used under the GPAC player to decode and display in real time the received SHVC layers. The SHVC reference software model (SHM) is used to encode the 4K original video in two spatial scalability layers:...
In this paper we propose a novel scheme for SVC-based video transmission over MIMO channels using precoder solutions. On the one hand, H.264/SVC codec ensures spatial, temporal and quality scalabilities and provides an intrinsic hierarchy over transmitted bitstreams. On the other hand, precoder designs, which decouple a MIMO channel into parallel and independent SISOsub-channels, offer a high BER...
In the most of ad hoc network simulators, the physical layer is considered with a simple approach. Moreover, the information routing is realized in order to only minimize the number of hops or the delay. In this paper, the authors propose two contributions: the first one consists in considering a 3D propagation model taking into account the characteristics of the propagation environment for SISO and...
This paper presents, in a first time, an original method of smart antenna design, based on an antenna array driven by vector modulators. Different radiation patterns are measured to validate the method. In a second time, we show the interest in using such antenna array in transports domain. Thus, we first integrate these radiation patterns into a 3D propagation simulator based on Ray-Tracing, to achieve...
The aim of this paper is to present an efficient scheme to transmit a compressed digital image over a non frequency selective Rayleigh fading channel. The proposed scheme is based on the locally adaptive resolution (LAR) algorithm, and the Reed-Solomon error correcting code is used to protect the data against the channel errors. In order to optimize the protection rate and ensure better protection...
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