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When videos are transmitted over the Internet, packet missing is inevitable and an entire frame may get lost. However, most of the literature on error concealment problems can only deal with block loss. For the case of frame loss, they usually fail to achieve satisfactory results. In this paper, we propose a highly effective frame concealment method, which gives amazingly good recovery quality. We...
The advance in multimedia technologies have resulted in an explosive growth of pictures in personal computers and in cloud. Typically many pictures taken in the same occasion are similar. The cost to store and transmit them can be very significant. Thus it is important to find an efficient method to store these pictures. This paper proposed a compression scheme for similar images. Our approach is...
This paper proposes an efficient intra-mode coding method using the deviation of neighbor pixels. In HEVC, the number of intra-prediction modes is increased in order to improve coding performance for intra-prediction as compared to H.264/AVC. However, this causes coding inefficiency in intra-mode coding. To improve coding efficiency, we propose a new intra-mode coding method that applies the analysis...
Intra prediction is an important part of intra-frame coding. A number of approaches have been proposed to improve intra prediction including a general linear prediction approach in which a weighted sum of all available neighbor pixels is used to predict each block pixel. An important part of this approach is the determination of the used weights. One method to determine the weights is to use the least-squares...
In order to improve coding efficiency, a new inter-layer prediction mechanism is incorporated in the SVC extension of H.264/AVC. This utilizes information from the base layer to inform the process of coding the enhancement layer. However this increases the computational requirement. A fast mode decision algorithm that exploits the correlation of a macroblock in the enhancement layer and both the corresponding...
New High Efficiency Video Coding (HEVC) standard is designed to provide substantial coding efficiency improvement compared to H.264/AVC. Latest subjective testing shows 50% improvement has been achieved. Many new technologies contribute to the overall improvement. Intra prediction with 35 modes is one of the key improvements. Associated with that, there is a new intra mode coding method to efficiently...
In this paper, a fast learning-based Coding Unit (CU) size selection method is presented for High Efficiency Video Coding (HEVC) intra prediction. Our analysis shows that non-normalized histogram of oriented gradient (n-HOG) can be used to select CU size. For each size of CU, n-HOGs of training sequences are clustered to construct a codebook offline. The optimum CU sizes are determined by comparing...
Intra prediction coding is mainly to eliminate the correlation of the spatial domain. Firstly the article introduces the traditional intra prediction algorithm. And then according to the correlation between the most likely patterns and best mode, It draws a pattern matrix. By the advantage of this mode matrix for early termination, it can improve the efficiency of intra prediction 9%–15% in the condition...
At present, most commonly used techniques in video encoding standards are based on motion compensation, discrete cosine and variable length encoding techniques. These techniques have the advance of improving the compression ratio, but at the same time, the compressed data stream will be very sensitive to transmission errors. In the error-prone network, the frame transmission error, which caused by...
Spatially scalable video coding (SSVC in short) provides an efficient way to deliver one video at different resolutions. Based on the development of emerging High Efficiency Video Coding (HEVC), we propose a SSVC scheme to provide both single-loop and multi-loop solutions by enabling different inter-layer prediction mechanisms. Specifically, there are three basic inter-layer prediction modes, inter-layer...
In this paper, the autocorrelation-based frame lossless recompression algorithm (AFLR) is proposed. The AFLR can save the memory bandwidth of video coding systems and preserves the visual-quality. The AFLR consists of two core techniques: (1) Correlation-based prediction technique, (2) Correlation-adaptive Golomb-Rice code. Furthermore, the relative block-based memory addressing (RBMA) is also proposed...
Compressed Sensing (CS) is a new approach to signal acquisition that can potentially allow us to design very simple video encoders that can be implemented on mobile devices with limited resources. However, previously proposed CS based video codec either require a conventional video codec or a feedback channel for effective operation, thus increasing the complexity. In this paper, a distributed Compressed...
In this work, we present a novel frame-level Rate Control algorithm for Multiview Video Coding encoder that adopts the Model Predictive Control technique in order to provide low bitrate fluctuation and high video quality. Our Model Predictive Rate Control (MPRC) predicts the bitrate for a frame by employing (i) inter-view inter-GOP (Group of Pictures) phase-based bitrate prediction, and (ii) temporal...
Layered structure anticipation method for inter-frame prediction based on the spatial-temporal correlation and mode homology features of encoding block is proposed in this paper. Firstly, the non-equilibrium distribution of inter prediction is found, and a temporal-spatial related fast mode decision algorithm is proposed to realize a pre-determination of intra or inter mode in the P frame encoding...
The motion vectors take a large portion of the H.264/AVC encoded bitstream. This video coding standard employs predictive coding to minimize the amount of motion vector information to be transmitted. However, the motion vectors still accounts for around 40% of the transmitted bitstream, which suggests further research in this area. This paper presents an algorithm which employs a feature selection...
This paper proposes a novel Slepian-Wolf decoding algorithm for distributed video coding by exploiting not only the statistical correlation between the side-information and source but also the spatio-temporal consistency constraint of video sequences. The proposed algorithm models the log-likelihood-ratio (LLR) information for Slepian-Wolf decoding as an anisotropic MRF model and solving the inference...
Among the emerging video coding schemes, the effectual solution for the separate-encoding and joint-decoding architecture is the distributed source coding (DSC). In the DSC-based video system, the side information is available in the Wyner-Ziv (WZ) decoder and video reconstruction. Theoretically, the quality of side information (SI), usually referring to the difference between SI and source, dominates...
Compound video compression is crucial for remote control and data assessment. In this paper, we propose a content-aware layered video coding scheme as an attempt to efficiently compress the compound video. In this scheme, the compound video is analyzed and processed progressively at three pyramid levels: block, object and layer. Firstly, the compound video is analyzed by a block type classification...
This paper focuses on side information (SI) refinement in Wyner-Ziv video coding and proposes to exploit the intrinsic property of channel coding for improving the joint decoding performance. In this paper, we propose to use syndrome and information bits from the encoder to help the decoder in refining the SI. We use extrinsic information transfer (EXIT) chart analysis to deduce the mutual information...
Due to network congestion and delay sensibility, it is always a great challenge for video transmission over lossy network. Multiple description coding (MDC) is an attractive approach to solve this problem. It can efficiently combat packet loss without any retransmission thus satisfying the demand of real time services and relieving the network congestion. In view of perfect compatibility with the...
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