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A Low-Density Parity-Check (LDPC) codec circuit is implemented in a 65nm Low-Power Partially-Depleted SOI (LP PD-SOI) technology, as well as in a "conventional" Low-Power Bulk technology for a fair comparison. PD-SOI allows to increase maximum frequency versus bulk at a given voltage, and to decrease dynamic power versus bulk at a given frequency. Thanks to a digital power switching technique...
Free space optical (FSO) communication offers the advantages of compact terminals and very high data rates without using scarce radio frequency spectrum. Unfortunately cloud and fog, together with scintillation caused by small temperature variations in the atmosphere, can result in significant attenuation and highly variable amplitude fluctuations that degrade link availability. This paper describes...
The paper proposes a novel method to compress color images with imperceptible quality loss. The algorithm explores the difference in error perceptibility of human visual system for various areas. It is done by implementing different non-uniform quantizers for flat, detail and random blocks of pixels. These blocks are classified based on principle component analysis (PCA) and prediction error. For...
A new class of delay-insensitive (DI) codes, called DI Bus-Invert, is introduced for timing-robust global asynchronous communication. This work builds loosely on an earlier synchronous bus-invert approach for low power by Stan and Burleson, but with significant modifications to ensure that delay-insensitivity is guaranteed. The goal is to minimize the average number of wire transitions per communication...
In views of optical CDMA confidentiality, this paper proposes a signature reconfiguration scheme over the network coder/decoders (codecs) design. By exclusively assigning to each network user a set of pseudo-orthogonal M-signature codes and randomly selecting one among them to represent each user's signature. A central node station is assumed to monitor network traffic condition and to signal transceiver...
Digital Cinema is a promising application that utilizes high-speed optical networks to transfer super high definition images. The networks are primary used for distributing packet data of digital cinema contents, and are also used to support new services such as the live streaming of musicals and sports games to movie theaters. While current transfer services offer HD quality video, live streaming...
A practical error-resilient M-description codec scheme is designed to combat the bit errors of the wireless broadcasting networks and raise the quality of the reconstructed signal. The signal is coded into large number of mutually refinable descriptions by robust staggered M-description scalar quantizer (RSMDSQ). Then an index assignment method is used to enhance the error-resilient capacity of any...
JPEG2000 image compression system consists of two main algorithms namely, discrete wavelet transform (DWT) and embedded block coding with optimized truncation (EBCOT). These algorithms are compute intensive and require efficient VLSI implementation for real time applications. Bit plane coder (BPC) and MQ coder are the two cores of the EBCOT algorithm. All processes to be executed by the MQ coder are...
A spectral replication coding scheme based on parametric stereo is introduced in this paper. Parametric stereo technique was initiated to encode both the left and right stereo channels more efficiently by extracting redundancy between these channels. A mono downmix signal plus small side information (some parameters) are transmitted instead of two channels. In the decoder both channels are reconstructed...
The unique requirements imposed by contemporary video communication applications promote the rise of the distributed video coding paradigm, which offers flexible complexity allocation and error resilience combined with competitive compression performance. This work proposes a novel Wyner-Ziv video coding scheme, performing hash-based motion estimation at the decoder. Subsequently, maximum likelihood...
Distributed video coding (DVC) is considered as one promising video coding scheme for Wireless Video Sensor Network (WVSN) due to its high compression efficiency and error resilience functionalities, as well as the low encoding complexity. In this paper, an improved DVC scheme based on checkerboard pattern splitting for Wyner-Ziv (WZ) frame is presented. In specific, the modified three-dimensional...
Based on China AVS standard, this paper proposed a method of built-in video watermark technology. Authentication information was generated from I frame as the watermark, and is embedded into selected positions of later P-, B-frames. An algorithm was designed and introduced in this paper to verify the video modification status via abstracted watermark. Dependent on feature of credible encoding/decoding...
In this paper, we address two problems found in embedded implementations of Scalable Video Codecs (SVCs): the temporal signal energy distribution and frame-to-frame quality fluctuations. The unequal energy distribution between the low- and high-pass band with integer-based wavelets leads to sub-optimal rate-distortion choices coupled with quantization-error accumulations. The second problem is the...
Distributed Video Coding (DVC) is a popular topic in the research community and the past years have seen several different implementations. DVC has been proposed as a solution for applications that have limited battery resources and low hardware complexity, thus necessitating a low complexity encoder. An ideal application would be in remote surveillance/monitoring or live video conferencing. However,...
The Distributed Video Coding (DVC) follows an approach different from the conventional video coding. DVC has a simpler encoder but a more complicated decoder. This feature makes it possible to encode video in computation and energy constrained devices. Thus, DVC is appealing in sensor networks and other wireless networks. When transmitting real-time DVC encoded video streams, in order to adjust coding...
In order to save the hardware cost and reduce the power consuming in Reed-Solomon codec, a reconfigurable multi-mode codec is presented, which provides support to encoder and decoder. The reconfigurable calculation module (RCM) in the codec can be reconfigured to perform as a linear feedback shift register (LFSR), syndrome generator and Chien's search algorithm calculator and can handle variable error...
In wireless multimedia communications, optimizing the quality of user experience is a major design goal, which is often quantified by the end-to-end distortion between the actual multimedia source at the encoder and its reconstructed version at the decoder. Joint source-channel coding (JSCC) techniques aim to optimize codec and radio system parameters in order to minimize end-to-end distortion and...
This paper proposed a whole new design for RV40(realvideo40) video decoder from FFmpeg(fast forward Moving Picture Experts Group),which is in lack of the ability to decode smoothly when decoding a period of high bit rate frames within some video streams. The design specially optimized the sub pixel interpolation algorithm, which is the core of motion compensation. The design uses detailed, different...
Distributed Video Coding (DVC), has been an attractive alternative to the conventional video coding for a number of applications because of its flexibility for designing extremely low complex video encoders. DVC based video codecs proposed in the literature generally include a dynamic feedback channel between the encoder and the decoder. However it is observed that this dynamic feedback mechanism...
With the rapid advancements in hand-held devices, traditional phone have also been developed into smart multifunctional mobile phones, which feature numerous functions and flexible operation. Such rapid advancement results from transformations of the embedded system architecture. In the mode of a multi-core cooperative work, the work requiring greater mathematical operations, such as video decoding,...
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