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LT codes promise reliable transmissions of data between peers and have been proven as a method especially suitable for multimedia multicast and broadcast applications. In this paper we study a model in which broadcast is carried out over a wireless multi-hop network by taking advantage of the reliability of LT codes. However the transmission method we put forward is quite different from the traditional...
The paper has a unique insight into the recently emerging erasure correcting codes, LT codes, in terms of its crucial structure of Robust Soliton Distribution in the truncation form. We propose a truncation scheme on the original degree distribution to achieve a higher decoding success probability while slightly decreasing the operational complexity. We test the influence of the truncation length...
Many problems have been identified in Internet applications such as slow network-access speed, frequent packet loss, etc. The constraints on bandwidth, excessive server downloading, instability of network performance and other factors may contribute to these problems. To seek the solutions to these problems in Internet, the author in this paper proposes the CDN (Content Delivery Network)-and-H.264...
MPEG Reconfigurable Video Coding(RVC) is a new platform-independent specification methodology chosen by the MPEG community for describing coding standards. This methodology aims at producing Abstract Decoder Models (ADMs) of MPEG decoders as dataflow programs described in RVC-CAL Actor Language (RVC-CAL). RVC-CAL naturally expresses potential parallelism between tasks of an application, which makes...
High resolution H.264 video contents are present over Internet and local storage devices in huge number thus pushing the need of supporting high definition H.264 video decoding in current generation hand held devices. Texas Instrument's (TI) OMAP3430 (Open Multimedia Applications Platform) is a multimedia processor which is highly used in portable devices. This paper describes the efficient implementation...
High resolution VC-1 (Video Codec-1) contents are becoming omnipresent over internet and local storage devices thus pushing the need of supporting high definition VC-1 video decoding in current generation handheld devices. Texas Instrument's (TI) OMAP3430 (Open Multimedia Applications Platform) is a multimedia processor which is highly used in portable devices. This paper describes the efficient implementation...
Video streaming over wireless connections remains a challenge today: even when data link and transport layer protocols are tuned to avoid retransmissions and thus reduce the delay and the used bandwidth, the impact on the perceived video quality of imperfect and band-limited radio channels is not negligible. This phenomenon is even more pronounced in multi-hop ad-hoc networks, where the received video...
Multimedia applications like high definition digital television push the manufacturers to increase available bandwidth mainly in Powerline Communication (PLC) links. Because of this needs in this work a PLC link control is developed to maximize the information rate meanwhile the bit error rate (BER) is maintained under a desired reference limit. The developed control system has a unique variable called...
Fountain codes have been suggested as an efficient solution for multimedia communications over erasure packet network. Therefore, the unequal error protection (UEP) fountain codes schemes are needed for the multimedia data of different importance. This paper proposed a novel technique to optimize the degree distribution of the generalized fountain codes that can provide strong UEP property. We further...
In this paper, we consider multimedia Quality-of-Service (QoS) in resource constrained embedded systems, where scalable applications are structured as directed acyclic graphs of tasks, which communicate via shared buffers. Scalable multimedia applications allow to trade quality for resource usage during run-time. We present two QoS problems: (i) temporal dependencies between subchains of tasks due...
This paper describes an OMAP based real-time test bench to find the Pareto frontier of an H.264/SVC decoder within a distortion-energy optimization space. A metric to estimate video distortion is introduced. In addition, energy consumption estimates are obtained from real-time measurements of the computational load. Finally, test bench operation is successfully demonstrated with different H.264/SVC-compliant...
Wireless communication of multimedia signals is often based on the transmission of source codec parameters which are protected against channel noise by channel coding. Commonly, a cyclic redundancy check (CRC) is introduced in order to check for erroneous frames after error correction. If the CRC fails, a bad frame indication (BFI) flag is set which controls a codec-specific frame error concealment...
This paper presents a new methodology in multimedia content generation in support to SOC decoder development and validation. The proposed content generation covers multi-standard video and audio. Content is categorized in conformance content, interoperability content, stress content, and negative content. Each category offers the ability to extend the scope of possibilities within the realm of coverage...
H.264 has become a popular video compression standard for years; however, the complexity of computation and huge amount of external data access are still the main problems. In this paper, we will propose two mechanisms to fulfill high performance H.264 baseline profile decoder on PAC Duo SOC platform. To reduce the complexity of computation, in addition to algorithm optimization, we use parallelizing...
In the fragile digital color image watermarking for RGB color image authentication, fragility or sensitivity of the embedded watermark to malicious attacks is an important problem. In this work the current researches propose Bit Plane Index Modulation (BPIM) based fragile watermarking scheme for authenticating RGB color image. To deal with counterfeiting attacks block wise division dependency is established...
RealVideo is one of the most popular digital video files on Internet. In this paper, the algorithm complexity and data parallelism of decoding process are analyzed and the RealVideo decoder is optimized with the Godson-2's SIMD multimedia expanded instructions and its architecture features. The results show that these optimizations have improved the performance and efficiency of RealVideo decoding...
Circuit design for wireless applications generally involves achieving a certain level of processing speed, dictated by the data transmission rate and algorithmic performance, while minimizing the energy dissipation. This paper discusses some of the circuit techniques that help to achieve this goal. We show that power reduction in a multimedia system involves trade-offs at the algorithmic, algebraic,...
Multiple description coding (MDC) provides stable wireless multimedia communications with the help of multiple transmission paths, while distributed video coding (DVC) effectively shifts the encoder complexity to decoder for mobile media devices. We proposed to combine MDC with DVC, abbreviated as MDVC, to construct a reliable and efficient video codec system. To improve the codec performance, the...
In this paper, an exception-based programming paradigm is envisioned to deal with timing constraints violations occurring in soft real-time and multimedia applications written in the C language. In order to prove viability of the approach, a mechanism allowing to use such paradigm has been designed and implemented as an open-source library of C macros making use of the standard POSIX API (a few Linux-specific...
With the huge increase in popularity of high definition applications, the traditional media player can not meet the demand for high-definition media broadcasting nowadays. This paper is focused on the system design of a next-generation progressive high definition media player based on Sigma Designs EM8623L, which adopted an embedded platform architecture and hardware decoding technology that support...
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