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In distributed video coding, the quality of the side information is of critical importance for the compression performance of the entire system. This paper proposes a novel transform domain Wyner-Ziv video coding scheme performing hash-based overlapped block motion estimation at the decoder. In this framework, a novel method to optimally generate side information from a collection of side information...
In this paper, we utilize sender-based Forward Error Correction (FEC) techniques to enhance the robustness of packet loss recovery for AVS Mobile speech and audio (AVS-M) codec. Two FEC schemes are proposed which take the advantage of the codec's structure characteristics and do not introduce extra delay. The objective and subjective listening tests results show that the two methods achieve higher...
In distributed video coding, the side information is commonly generated by motion-compensated temporal interpolation of the neighboring reference frames at the decoder side. The side information quality has a strong impact on the final rate-distortion performance of the codec. In this paper, we propose a successive refinement after the decoding of each DCT subband to improve the accuracy of motion...
The work presented in this paper addresses the increasing demand of visual signal delivery to terminals with arbitrary resolutions (like in mobile multimedia communication and cloud computing) for universal access and presentation, without extra computational burden to the receiving end. Scalable image compression and transmission are essential, and to be effective and meaningful, it has to be content-based...
In views of reconfiguring optical CDMA (OCDMA) network coder/decoders (codecs), a dynamic signature coding scheme structured over arrayed-waveguide gratings (AWGs) is devised. The signature reconfiguration can find applications on enhancing OCDMA network confidentiality. On the basis of cyclic and periodic characteristics of M-sequence codes compatible with free-spectral range (FSR) of novel prime-dimension...
In this paper, a highly efficient pixel compensator architecture for the H.264/AVC standard is proposed which can provide both inter and intra prediction functions for luma and chroma components of pixels. By decomposing the algorithms used for both prediction methods into small micro-operation steps, a suitable common arithmetic unit architecture capable for performing these operations has been determined...
Quantizer design for lossy compression with mismatched side information (SI) at the decoder is investigated. The statistical dependency between the source and SI is assumed to be a function of a random variable, dependency variable (DV). According to the available information about the DV, three design methods are proposed; namely, minimax solution, Average Distribution and Multi-Mode Decoder. The...
Unified Speech and Audio Coding (USAC) is an emerging MPEG audio standard striving for efficiently representing both speech and music signals even in very low bitrate ranges. The reference codec takes an approach of unifying two state-of-the-art speech and audio coding structures in a single platform. This paper proposes an enhanced long term predictor (eLTP) that effectively utilizes periodic redundancies...
Although great achievements have been obtained in the past, recent developments towards ultra high definition video have been asking for further compression efficiency gains regarding the H.264/AVC state-of-the-art. As an answer to these needs, ITU-T and MPEG started a new standardization project called High Efficiency Video Coding. This paper extends and integrates a perceptual visual model in the...
This paper presents high quality monaural superwideband extensions to G.711.1 and G.722, recently standardized as Recommendations ITU-T G.711.1 Annex D and G.722 Annex B. The superwideband (50-14000 Hz) functionality is achieved using embedded scalable structure that adds extension layers on top of the wideband core codecs. The bit rates are extended to 96/112/128 and 64/80/96 kbit/s for G.711.1 and...
Distributed video coding (DVC) is an emerging video coding paradigm for systems which fully or partly exploit the source statistics at the decoder to reduce the computational burden at the encoder. This paper considers a Low Density Parity Check (LDPC) based Transform Domain Wyner-Ziv (TDWZ) video codec. To improve the LDPC coding performance in the context of TDWZ, this paper proposes a Wyner-Ziv...
We present several new methods for coding of spectrum coefficients in embedded audio codecs. In audio codecs, the spectrum is often divided in sub-bands, and quantized using a vector quantization. In many applications, the limited bit-budget allocated to the vector quantization is not sufficient to cover all the sub-bands, and the distortion of the spectrum in the unquantized sub-bands frequently...
In this paper, an AVS-embedded multi-format video decoder is presented. It integrates AVS JP@L6.2, H.264 HP@L4.2, VC-1 AP@L3, and MPEG-2 MP@HL in a single chip and features resources sharing, memory management, and early-stage acqusition to facilitate cost and bandwidth efficiency. For the applications of broadcasting, an adaptive error concealment method is proposed. A chip is fabricated and integrates...
Low-Density Parity-Check (LDPC) codes are very efficient error control codes that are being considered as part of many next generation communication systems. In this paper FPGA implementations of two low complexity decoders are presented. These two implementations operate over any kind of parity check matrix, (including those randomly generated, structurally generated, either systematic or non systematic)...
Software Defined Radio (SDR) is one of possibilities to realize the structure of device with a high mobility, flexibility and reconfigurability. This technology can provide the seamless shifting between existed air-interface standards. Extending the flexibility further, a system capable to sense the spectrum space available for communication and adapt to it is Cognitive Radio. Obviously SDR in Cognitive...
In this paper, the performance evaluation of an asymmetric turbo code for different codec parameters have been done. The asymmetric turbo codes performances are compared with symmetric counter part of the turbo code. With proper selection of weight configuration, the turbo code can show better results in both water fall region as well as error floor region simultaneously. So, in some cases asymmetric...
This talk intends to bring out the following ideas: Understanding decoding power is important for design of relevant codes at short distances. Just as we have models for channel to understand transmit power, we need models of decoding implementation to understand decoding power. Node model: total power diverges to infinity as Pe → 0. Optimal transmit power bounded away from Shannon limit. Wire model:...
In spite of the widespread attention to data and video, voice is still responsible for up to 75% of the revenue in wireless communications systems today. An unfortunate characteristic of 2nd and 3rd generation digital cellular systems has been the need to transcode at most network interfaces, since the voice codec at the other end of the call is usually unknown and cannot be negotiated. Fourth generation...
Causal video coding is a coding paradigm where video source frames X1, X2, ..., XN are encoded in a frame by frame manner, the encoder for each frame can use all previous frames and all previous encoded frames, and the corresponding decoder can use only all previous encoded frames. In the special case where the encoder for each frame Xk is further restricted to enlist help only from all previous encoded...
Compared to other soft-decision decoding algorithms of Reed-Solomon (RS) codes, the low-complexity Chase (LCC) algorithm can achieve better performance-complexity tradeoff. In order to reduce the complexity of the LCC decoding, the re-encoding and coordinate transformation techniques can be applied for high-rate codes. In this case, to recover a codeword for an (n, k) RS code, an erasure decoding...
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