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This paper presents a software architecture that supports fast channel change in DVB-S/C/T set top boxes. Long channel zapping time is an issue that has been addressed first in the context of IPTV set top boxes, where it has been an obstacle for successful commercialization of IPTV. In DVB-S/C/T the channel zapping time has not been in the focus that much, but with the development of tuners and appearance...
With the development of computer network technology and multimedia technology, real-time multimedia transmission will become increasingly important. Due to the current network bandwidth, multimedia data compression technology, and other restrictions, such as distance learning, audio and video conferencing systems, remote medical diagnosis is now basically have not been fully realized. In this paper,...
Random linear network coding simplifies routing decisions, improves throughput, and increases tolerance against packet loss. A substantial limitation, however, is delay: decoding requires as many independent linear combinations as data blocks. Hierarchical network coding purportedly solves this delay problem. It introduces layers to decode prioritized data blocks early, which may benefit video streaming...
The growing popularity of powerful mobile devices such as smart phones and tablet devices has resulted in the exponential growth of demand for video applications. However, due to the intensive computation of the video decoding process, mobile video applications require frequent embedded memory access, which consumes a large amount of power and limits battery life. Various low-voltage memory techniques...
Digital videos play an important role today: they are used for entertainment, for communication and for information exchange. Within the internet, there are many sources that provide video content in different ways. Videos can be streamed in real-time or downloaded for local usage. In all these scenarios, video content is exchanged using some sort of binary serialization format. Consequently, compatible...
In this paper, we present a Smart Audio/Video Mixing method (SmartAVM) for a software-based multipoint control unit (SW-based MCU) to provide an immersive video conferencing service. The SmartAVM determines the mixing mode to one of the true mixing, equal mixing, and main speaker decision-based mixing modes, according to the number of clients (i.e., human users) connected to the SW-based MCU. Then,...
Parallel decoding of encoded data streams is an important scheme that is widely applied in image and video applications. Especially with the increasing demand on higher resolutions and frame rates, parallel decoding becomes very useful to meet the throughput requirements. Parallel decoding is conventionally enabled by inserting markers into the variable length code (VLC) stream. The markers allow...
This work presents a simple study of stochastic arithmetic complex number operators for addition and multiplication. Their usage is demonstrated by design of a sum of product circuit As the stochastic complex number operators need more control random streams than stochastic rational number operators, we optimized the number of random generators used in the real circuit. In the end our sum of product...
A lower power and area efficient VP9 and multi-standard video decoder chip is first-reported for Android 4K TV. It supports prevalent MPEG-x, VP-x, RMx, WMV-x and H.26x series video standards in a single chip. Three high-throughput techniques, look-ahead re-mapping, early stage pipeline and dynamic-scheduled bus translation, are proposed. They cuts the processing times by 51.2% compared to the state-of-the-art...
Compressed Sensing(CS) based video coding techniques are low-complexity in general, but with marginal compression results. Also, wireless multimedia devices have serious resource constraints, with fluctuations in bandwidth(for up-link traffic) and available power. In this paper we propose a nested technique in which CS data is further compressed within the CS domain to give far better compression...
This paper proposes a generation scheme of compliance test streams for verifying conformance of a digital cable UHD (Ultra High Definition) receiver including video and audio decoders as well as system and closed caption modules. The proposed test streams for video and audio decoders can test compliance with HEVC (High Efficiency Video Coding) standard and DTS(Digital Theater System)-HD(High Definition)...
Multimedia streaming applications have stringent Quality-of-Service (QoS) requirements. Typically, each packet is associated with packet delivery deadline. We are interested in designing feedback-based adaptive network coding schemes with the aim of minimizing decoding delay and video distortion in wireless broadcasting networks over the packet-erasure channel. In this paper, we first introduce the...
To increase the overall visual quality of the video services without increasing data rate, we developed an unequal protection technique called UEP3D (Unequal Error Protection 3D) based on a hierarchy of the video stream in different levels of importance,. The determination of levels of importance takes three classification criteria: pixel level, macroblock level and image level. At the end of the...
In this paper we propose a hybrid tracking method which detects moving objects in videos compressed according to H.265/HEVC standard. Our framework largely depends on motion vectors (MV) and block types obtained by partially decoding the video bit stream and occasionally uses pixel domain information to distinguish between two objects. The compressed domain method is based on a Markov Random Field...
In this paper, we pose a new problem of video enhancement transcoding, which converts the compressed dark video into compressed normal-lighting one. Distinct statistics of dark and normal videos result in quite different coding modes, which thus enforces latent constraints on mode conversion during transcoding. Following this idea, we propose a fast mode decision algorithm to speed up computation...
Real-time video applications, such as multi party video conferencing, involve the simultaneous transport of multiple and potentially multi-layered video sources to participating or interested parties. It is desirable to mix these multiple source videos into a single video stream at intermediary nodes in the network, e.g. at Multipoint Control Units (MCU). This has the advantage of reduced application...
A light field (LF) is a 2D array of closely spaced viewpoint images of a static 3D scene. In an interactive LF streaming (ILFS) scenario, a user successively requests desired neighboring viewpoints for observation, and in response the server must transmit pre-encoded data for correct decoding of the requested viewpoint images. Designing frame structures for ILFS is challenging, since at encoding time...
To enable robust multiview video streaming over current wireless broadcast infrastructures, this paper proposes a joint source and channel coding optimization framework for video streaming based upon multiview video coding technique. It utilizes random linear coding (RLC) with ladder-shaped global coding coefficient matrix (GCM) for unequal erasure protection. An accurate expression of the decoding...
Multimedia content is now routinely distributed between devices across global networks. These devices differ in their video rendering capability in terms of frame rate, quality, and spatial resolution. To facilitate content exchange between such devices it is necessary to transcode the video format; otherwise no exchange can take place. To prolong battery life on mobile devices, transcoding may take...
Video streaming applications are increasingly popular but suffer from quality variations in best effort transmission networks. The recent DASH standard allows to dynamically adapt the transmitted rate to the network conditions under the control of the receiving client to achieve the best user experience. Naturally, the final video quality is also critically determined by the compression efficiency...
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