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State of the art video compression techniques use the motion model to approximate geometric boundaries of moving objects where motion discontinuities occur. Motion hints based inter- frame prediction paradigm moves away from this redundant approach and employs an innovative framework consisting of motion hint fields that are continuous and invertible, at least, over their respective domains. However,...
Surveillance visual systems play an important role in modern life, especially in the Internet of Things (IoTs) era. However, the limitation of bandwidth, energy resources and the heterogeneity of devices, networks and environments have been asking for a more powerful video coding solution, which provides not only the high compression efficiency but also the flexible scalability capability. In this...
Virtual reality applications make use of 360-degree panoramic or omnidirectional video with high resolution and high frame rate in order to create the immersive experience to the user. The user views only a portion of the captured 360-degree scene at each time instant, hence streaming the whole omnidirectional video in highest quality is not efficient. In order to alleviate the problem of bandwidth...
A few years after standardization of the High Efficiency Video Coding (HEVC), now the Joint Video Exploration Team (JVET) group is exploring post-HEVC video compression technologies. In the intra prediction domain, this effort has resulted in an algorithm with 67 internal modes, new filters and tools which significantly improve HEVC. However, the improved algorithm still suffers from the long distance...
With the significant increase of the network heterogeneity and the wide use of emerging video applications such as wireless sensor networks, video surveillance systems or remote sensing, the Distributed Scalable Video Coding (DSVC) is a potential solution for efficiently transmitting and storing video data due to its high compression efficiency and low encoding complexity capabilities. In DSVC framework,...
Transrating is a bitrate transcoding technique that facilitates video applications in heterogeneous environments. This paper presents a fast coding-unit (CU) mode decision algorithm for transrating a once-encoded HEVC bitstreams to lower bitrate versions of diverse quality levels. The proposed method comprises three major parts. First, an early SKIP decision is based on the modes and motion vectors...
The fast growth of surveillance video big data presents great challenges to the video coding technology. Most existing video coding techniques target for visual quality optimization, while the ultimate utility of surveillance videos mainly lies in intelligent analyses, e.g., pedestrian detection and vehicle tracking. In view of this, we aim at proposing an efficient, standard-compatible and simultaneously...
Real-time video performance is difficult to guarantee under mobile communication environments characterized by loss-probability-varying transmission channel, heterogeneous networks, and various mobile devices of different access capabilities. In this paper, a novel attention-based network-aware robust video coding scheme mixing adaptive intra refresh with reference picture selection is proposed to...
Data movement to and from off-chip memory dominates energy consumption in most video decoders, with DRAM accesses consuming 2.8x–6x more energy than the processing itself. We present a H.265/HEVC video decoder with embedded DRAM (eDRAM) as main memory. We propose the following techniques to optimize data movement and reduce the power consumption of eDRAM: 1) lossless compression is used to store reference...
Recently, the forward error correction (FEC) codes are gaining popularity in video transmission community because of its capability of recovering lost packets in lossy wireless networks. The state-of-the-art scheme for FEC video transmission are the delay-aware fountain codes (DAF), which combine the ratelessness of fountain codes with the property of video coding. However, DAF assumes that all the...
This paper describes a new 120 fps (frames per second) real-time HEVC encoder for higher frame rate video encoding and transmission. Modification in the flexible customizable software architecture of encoder LSIs makes it possible to achieve the temporally scalable HEVC encoding with upward compatibility for existing 60 fps-based systems. The encoder also achieves 4K/120fps video encoding in real...
Traditional intra prediction schemes usually only use the nearest adjacent reference lineto generate the prediction. Although the nearest reference line generally has the strongeststatistical correlation with current block, the farther non-adjacent reference lines can stillprovide potentialb etter prediction in some cases. Thus, in this paper, not only the nearestreference line but also the farther...
The High Efficiency Video Coding (HEVC) standard defines 35 Intra Prediction Modes (IPM) to provide an efficient compression of intra coded blocks. Those IPMs are signalled to the decoder through the use of three compression tools: prediction, clustering and coding. In this paper we provide improvements to these three tools through: new labels for the prediction, new tests for the clustering and new...
In this paper, a MV derivation method based on the idea of frame rate up-conversion (FRUC) is proposed. When a block is signaled as FRUC mode, the motion information of the block is derived without signaling. Moreover, derived MVs are refined at sub-block level for more accurate motion field. In addition, two matching methods, i.e., bilateral matching and template matching are supported to obtain...
Scalable High efficiency Video Coding (SHVC) is the scalable extension of the latest video coding standard High Efficiency Video Coding (HEVC). One of the key novelties introduced by SHVC is that it enables hybrid codec scalability. This basically means that the video layers can be encoded with different video standards providing backward compatibility between codecs. In this paper, we propose a software...
In this paper, we propose a network coding solution to improve transmission reliability of scalable video coding (SVC) streams over lossy networks. Since scalable video coding produces various levels of quality with variable bitrates, we design a prioritized network coding scheme combining different encoding approaches: generation-based and sliding window based schemes. We carried out a performance...
With a low complexity and high successful probability, RaptorQ code is considered as an efficient solution for media transmission. However, RaptorQ code is optimal for the purpose of single layer transmission. Therefore, RaptorQ code is not suitable for dependent media transmission, where the successful decoding of the least important layer depends on the successful of the more important layer, especially...
We propose an efficient motion compensation method based on a temporally extrapolated frame by using a pel-wise motion (optical flow) estimation. In traditional motion compensation methods, motion vectors are generally detected on a block-by-block basis and sent to the decoder as side information. However, such block-wise motions are not always suitable for motions such as local scaling, rotation,...
A video analyzer is a comprehensive bitstream analysis tool which accelerates development and debugging of video bitstreams while ensuring compliance with industry standards. There are many conventional analyzers present for different video standards like H.264, HEVC which are compliant only with the respective video sequence format. In this work, a generalized analyzer with integrated encoder is...
High Dynamic Range (HDR) videos are commonly compressed using existing Low Dynamic Range (LDR) coding standards. This necessarily implies a Tone Mapping (TM) stage which aims at reducing the input video range while preserving the most significant scene details. In most cases, a residual sequence is encoded and used at the decoder side to recover the HDR content. The challenge is to efficiently encode...
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