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In this paper a 100 Mbit/s Huffman decoder implementation is presented. A novel approach where a parallel decoding of data mixed with a serial input has been used. The critical path has been reduced and a significant increase in throughput is achieved. The decoder is aimed at the MPEG-2 Video decoding standard and has therefore been designed to meet the required performance.
This paper aims at a new challenge caused by a specific type of real-life problems that require to not only process tremendous videos, dig out cross-video information, but also guarantee a real-time responsiveness to the user. Moreover, users want to adapt the resources to the actual amount of visual objects, rather than to the number of videos, in order to better match resource consumption to the...
In IEEE 1857/AVS decoder, the deblocking filter is one of the most time consuming tasks and it accounts for nearly 30% of the decoder complexity. Due to data dependence in the process of filtering, it is a big challenge to execute deblocking filter in parallel efficiently. In this paper, a parallel algorithm is proposed, which hides the data dependence by dividing a frame into several 8 x 8 Intersection-blocks...
The goal of partial encryption of a bit stream is to make the entire stream somehow useless for anyone that cannot decrypt its ciphered subset. In this paper we present the effects of the partial encryption of some H.264/AVC coding parameters, in order to obtain a moderate degradation of the video content, which can be appealing for commercial applications, like pay-per-view systems and others, without...
Many advanced video transmission techniques rely on per-packet distortion estimates. To compute reliable estimates, however, the decoder inner workings, including the concealment module used in case of packet losses, should be fully known at the encoder. This paper explores the effects on video distortion estimation of encoder-side erroneous assumptions about the concealment technique used by the...
This paper deal with the simulation and application of DVB channel coding on multimedia DSP development board uses Nexperia processor. The application provides the protection against errors during the transmission of real digital video by the transmission channel model in baseband. Applied codes present FECs protection (forward error correction codes - RS code, convolutional code, interleaving) and...
A novel cross-layer scheduling and stream switching algorithm for content and channel adaptive video streaming over 1xEV-DO (CDMA-HDR), where stream switching is done according to the receiver buffer level is presented. The instantaneous transmission rate to each user is determined by a multi-objective optimized scheduler, maximizing network throughput and individual receiver buffer levels simultaneously,...
In this paper we present an implementation of an Adaptive Playout System for video rendering. This system can be used for rendering multimedia material that is delivered (in single/multi-cast fashion) to the final user(s) over a “besteffort” network that is unable to guarantee a constant delay in the delivery of the data packets. The proposed solution is an alternative to the “traditional” pre-buffering...
This paper is concerned with the problem of error detection and correction of MPEG-4 video streams transmitted over lossy networks. The problem is first defined and some relevant detail of the MPEG-4 syntax is presented. The difficulties encountered in articulating this problem within a unified Bayesian framework are explored and two separate frameworks for dealing with error detection and error correction...
Image-based rendering is a powerful and promising approach for 3D object representation. This approach considers 3D object or scene as a collection of images called key frames taken from the reference viewpoints and generates arbitrary views of the object using these key frames. In this paper, we present an object-based encoding scheme for the multi-view sequences (key frames) of 3D object and a view...
Modern microprocessors and desktop systems are increasingly being designed for multimedia performance. Video, audio, and 3-D graphics processing require architecture which takes into account synchronous parallel processing of massive amounts of data in realtime. To deal with this type of processing multimedia insitruction sets are used. Multimedia processing poses also many problems on a system level...
This paper deals with the evaluation, analysis and algorithm of advance options of H.263 and H.264/AVC video codec. Analysis and evaluation of H.263 video codec is important because it enable us to determine output parameter, which is peak signal to noise ratio (PSNR) or quality of picture. In this paper, the performance of H.263 video codec is evaluated and analyzed for various advance options such...
Efficient transmission of multimedia has become a crucial task in next generation cellular wireless and internet protocol (IP) network. Transmission of video at various rates is now a common interest. In various video applications some source symbols are considered to be more important and must be received prior to rest. A packet loss from the important symbols is not encouraged. Recently application...
Performing a compression over massive video files in any network is one essential task from network and traffic management viewpoint. In the most recent times, HEVC (High Efficiency Video Coding) has stood up as new signaling protocol for performing video compression. Unfortunately, owing to the novelty in HEVC, there is less evidence of effective traffic management in prior studies. Therefore, the...
Pre-processing and post-processing algorithms improve on the performance of a video compression system especially by removing spurious noise and insignificant features from the original video data. So that this will increases compression efficiency, attenuates coding artifacts and mainly improving the quality of Video data. And more over existing video compression standards like MPEG, H.26x series...
In current era, most of the information is captured using multimedia techniques. Most used methods for information capturing is through images and videos. In processing a video, large information needs to be processed and a number of frames could contain similar information which could cause unnecessary delay in gathering the required information. Video summarization can speed up video processing...
Video coding standards (e.g. H.264, HEVC) use slice, consisting of a header and payload video data, as an independent coding unit for low latency encode-decode and better transmission error resiliency. In typical video streams, decoding the slice header is quite simple that can be done on standard embedded RISC processor architectures. However, universal decoding scenarios require handling worst case...
Flexible Dual-TCP/UDP Streaming Protocol (FDSP) is a new method for streaming H.264-encoded HD video over wireless networks. The method takes advantage of the hierarchical structure of H.264/AVC syntax and uses TCP to transmit important syntax elements of H.264/AVC video and UDP to transmit less important elements. FDSP was shown to outperform pure-UDP streaming in visual quality and pure-TCP streaming...
Frame skipping relieves decoding workloads, decreasing power consumption, but may degrade video quality perceived by users. To address this, this paper proposes a new frame-rate adjustment method that takes the degree of motion changes into account with small computational overhead. The proposed scheme was implemented on a smartphone.1
Many research efforts have been done to guarantee the quality of service for video streaming over LTE. Among them, cross-layer optimized video delivery is one of the most commonly adopted approaches. However, most existing schemes of cross-layer optimized video delivery adopt PSNR as the optimization target, but do not well consider human vision characteristics. In this paper, we adopt a new metric...
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