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This paper presents a high-throughput deblocking filter accelerator which can process one macro block (MB) within 48 cycles for H.264/AVC/SVC. This innovation is achieved by considering both luminance and chrominance data together in arranging the filtering schedule. Cooperating with the filtering schedule, the proposed quadruple-filter-based architecture can simultaneously execute filtering of four...
Dual-core platforms are growing as a new industry trend as platforms with only one core cannot easily perform the diverse functions in current embedded system applications, such as smart phones. We establish an easy-to-use co-simulation dual-core virtual platform to validate the functionality of hardware and software jointly. In our platform, the hardware components are implemented by SystemC, and...
H.264, MPEG-4 Part 10, is the latest digital video coding standard that achieves very high data compression by using several new coding features. One of the new feature is variable block sizes for inter frame coding to increase compression efficiency. However, to achieve this, the H.264 encoder employs a complex mode decision technique based on rate-distortion optimization (RDO) that requires high...
Radio frequency identification (RFID) tag has been extensively used in diverse applications, recently. For instance, we may use it to track freights on a warehouse, to catch a thief for lost luggage and to rapidly locate lost children or passengers who fail to arrive on time at the departure gates of major airport. It can also be employed for transmitting multimedia content (especially for video)...
Asymmetric stereoscopic coding can save bitrate and maintain the overall visual quality of stereoscopic perception, so it is an alternative for wireless environment in which the bandwidth is limited. In asymmetric stereoscopic coding, the right-view images are down-sampled to half resolution before coding, while the direction of sampling influences the rate-distortion performance of the asymmetric...
Abstract--This article is based on H.264/AVC video coding standard, including analysis of the current UMHexagonS algorithm processes and problems, Optimization of the entire pixel search algorithm UMHexagonS and an improved sub-pixel search algorithm, and gives the improved UMHexagonS algorithm process ,describes its advantages. Experimental results show the improved efficiency of the algorithm, practical...
This paper presents an intelligent video surveillance system. The system is composed of one or more nodes flexibly according to the application scenarios such as private properties, banks and museums. Each node is an autonomous vision-based device capable to perform intelligent tasks. It is able to digitize and compress the acquired analog video signals in MPEG-4 standard and then transmit the compressed...
Motion estimation for video coding problem, a prediction based on the triangle - a small cross algorithm. The algorithm is mainly used in small cross on the static template blocks and blocks of small campaign focused search, the search for large sports block with triangle template. With the classic diamond search algorithm and square - diamond search algorithm comparison, the search speed increased...
Because of the high computation demand for multimedia applications like video decoding, there is a need to develop flexible and high performance reconfigurable computing architectures. Taking video decoding algorithm as an example, we propose a reconfigurable computing realization solution of multimedia application. Based on the analysis of parallelism in video decoding algorithm, a hardware platform...
Bitrate adaptation and higher compression ratio are the major issues in world of Video compression. H.264 is the latest standard for video compression with high flexibility in compression ratio, quality of video and rate adaptation. This paper explores the possibility of bitrate reduction and proposes an algorithm to calculate the cost of each 8x8 subMacroblocks. Based on the threshold and the cost...
In order to extract valid information from video, process video data efficiently, and reduce the transfer stress of network, more and more attention is being paid to the video processing technology. The amount of data in video processing is significantly reduced by using video segmentation and key-frame extraction. So, these two technologies have gradually become the focus of research. With the features...
Distributed video coding (DVC) is a novel approach providing new features as low complexity encoding by mainly exploiting the source statistics at the decoder based on the availability of decoder side information. In this paper, scalable-to-lossless DVC is presented based on extending a lossy Transform Domain Wyner-Ziv (TDWZ) distributed video codec with feedback. The lossless coding is obtained by...
Distributed video coding is a new paradigm for video compression based on the Slepian-Wolf and Wyner-Ziv theorems. Wyner-Ziv video coding, a lossy compression with receiver side information, enables low-complexity video encoding at the expense of a complex decoder. Most of the existing distributed video coding techniques require a feedback channel to determine the number of parity bits for decoding...
Most distributed source coding schemes involve the application of a channel code to the signal and transmission of the resulting syndromes. For low-complexity encoding with superior compression performance, graph-based channel codes such as LDPC codes are used to generate the syndromes. The encoder performs simple XOR operations, while the decoder uses belief propagation (BP) decoding to recover the...
Side information generation is a critical step in distributed video coding systems. This is performed by using motion compensated temporal interpolation between two or more key frames (KFs). However, when the temporal distance between key frames increases (i.e. when the GOP size becomes large), the linear interpolation becomes less effective. In a previous work we showed that this problem can be mitigated...
Transmission of compressed video over error prone channels may result in packet losses or errors, which can significantly degrade the image quality. Such degradation even becomes worse in 1Seg video broadcasting, which is widely used in Japan and Brazil for mobile phone TV service recently, where errors are drastically increased and lost areas are contiguous. Therefore the errors in earlier concealed...
This paper proposes a method to efficiently find motion vector predictions for zonal search motion re-estimation in fast video transcoders. The motion information extracted from the incoming video stream is processed to generate accurate motion vector predictions for transcoding with reduced complexity. Our results demonstrate that motion vector predictions computed by the proposed method outperform...
The requirement to transmit video data over unreliable wireless networks is anticipated in the foreseeable future. Significant compression ratio and error resilience are both needed for applications including tele-operated robotics, vehicle-mounted cameras, sensor network, etc. Block-matching based inter-frame coding techniques, such as MPEG-x and H.26x, do not perform well in these scenarios due...
Information Hiding is a good method to transmit important information secretly. Video sequences usually include many frames, so they have more room to hide information. In the paper, in order to increase the amount of hiding information, we choose MPEG sequences as hosts, and we present a practical method to hide information in MPEG compressed video. Generally, there are many B-frames in each GOP...
This paper focuses on recent research on unequal error protection random linear coding (UEP RLC) for applications in network coded (NC) multimedia communications. We define a class of UEP RLC called expanding window random linear coding (EW-RLC) and provide exact decoding probability analysis for different importance classes of the source data assuming the Gaussian Elimination (GE) decoder applied...
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