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In this paper, we propose a prediction algorithm that uses adaptive predictor structures for loss less video coding. The proposed encoder finds cross-correlation coefficient between current frame and motion compensated previous frame and classifies the coefficient value into a small number of bins. For general videos, we propose four bins and associate different predictor structures with each of the...
In this paper, we present a secondary transform that is applied in a codec after the conventional DCT for all the video-coding intra prediction modes. Our approach is applicable to any block-based intra prediction scheme that employs transforms along the horizontal and vertical direction separably. The secondary transform is applied to the lower 8×8 frequency coefficients of the output of conventional...
Rate distortion optimization (RDO) algorithm plays the vital role in the up to date hybrid video codec H.264/AVC. The RDO algorithm of H.264/AVC reference software is built up by assuming that the transformed residues are memoryless variables. However, our experiments reveal that, for some sequences, the strong temporal correlations exist in the prediction residues. This paper extends the Lagrangian...
The emerging high-efficiency video coding (HEVC) standard employs a new coding structure characterized by coding unit (CU), prediction unit (PU) and transform unit (TU). It improves the coding efficiency significantly, but also introduces great computation complexity on the decision of optimal CU, PU and TU sizes. To reduce the encoding complexity, we propose a CU splitting early termination scheme...
With the advance of digital photographing technology, large amount of personal photos are created and stored online or in personal computers. To save storage space and transmission bandwidth, we proposed a new photo album compression scheme by using both intra prediction and inter prediction to reduce spatial and temporal redundancy. Specifically, we first cluster the images so that each cluster containing...
An adaptive power management of on-chip video memory for Multiview Video Coding is presented. It leverages texture, motion and disparity properties of objects and their correlations in the 3D-neighborhood. It groups different Macroblocks of a frame and predicts the highly-probable motion/disparity search direction in order to power-gate idle memory regions. Exploited are the statistical properties...
In this paper we present a video coding scheme based on texture synthesis through Directional Empirical Mode Decomposition (DEMD). In this scheme P and B-frames of the video sequence are decomposed and parametrically coded with the help of DEMD algorithm, while I-frames are coded with the help of H.264. All P and B frames are decomposed into Intrinsic Mode Function (IMF) image and its residue. Only...
Multiview video coding (MVC) plays an important role in 3D video system, while the huge computational complexity blocks its applications. This paper proposes an adaptive Inter mode decision algorithm to reduce the complexity of MVC. First, the selection of Inter modes is determined by using the textural region type of macro block (MB). Then, the estimation of small size Inter modes (Inter16x8, Inter8x16,...
Low-power and low-cost distributed wireless video sensors play important roles for applications in machine-to-machine (M2M) and wireless sensor networks. Distributed video coding (DVC), an emerging coding technology based on Wyner-Ziv theory, seems to be a possible solution for implementing low-power video sensors since most of the computational complexity is moved from the encoder to the decoder...
As the next generation standard of video coding, the High Efficiency Video Coding (HEVC) is intended to provide significantly better coding efficiency than all existing video coding standards. To improve the coding efficiency of intra frame coding, up to 34 intra prediction modes are defined in HEVC. The best mode among these pre-defined intra prediction modes is selected by rate-distortion optimization...
Wyner-Ziv video coding is a new paradigm for video compression, in which the prediction frames are possibly only available at the decoder. It exploits the redundancy between the source frame and the prediction frame at the decoder by utilizing their correlation information. However, such correlation information is difficult to estimate due to the absence of the prediction frame at the encoder and...
High Efficiency Video Coding (HEVC) is an in-progress next generation video coding standard. It has a similar basic structure to the ITU/MPEG H.264/AVC coder but with further enhancement on each coding tool to increase compression efficiency. Thus, a Residual Quadtree (RQT) coding scheme is adopted in the conventional transform coding procedure. The cost is the additional computation complexity when...
To tackle the problem of lacking auxiliary information while generating the side information, we have proposed a novel spatial aided low delay Wyner-Ziv video coding scheme in which the wavelet transformation is applied to generate the auxiliary information. However, there exists an inefficiency that lowers the coding performance. The inefficiency is that many wavelet coefficients having very small...
The H.264 scalable video coding (SVC) standard adopts three inter-layer prediction techniques to achieve high coding efficiency. However, to find out the best coding mode in large number of candidates, exhaustive search scheme results in extremely large computation complexity, which obstructs SVC from the practical application. To speed up the SVC encoder, a fast mode decision algorithm for spatial...
Correlation Noise Modeling (CNM) is a key factor to influence the performance of Distributed Video Coding (DVC). In most current CNM solutions, the distribution parameter is estimated based on the motion compensated residual frames and kept constant during the decoding process. A progressive correlation noise refinement method is proposed in this paper for transform domain Wyner-Ziv video coding to...
In this paper, we propose a novel scheme for dynamically reducing the computational complexity of MVC. Our scheme exploits the coding mode correlation available in the 3D-neighborhood (i.e., spatial, temporal, and view) along with the rate-distortion properties of the neighboring Macroblocks. Our scheme incorporates a multi-level mode decision process based on a mode-ranking mechanism that categorizes...
In this paper, we present a mode-dependent transform scheme that applies either the conventional DCT or type-7 DST for all the video-coding intra-prediction modes: vertical, horizontal or oblique. Our approach is applicable to any block-based intra prediction scheme in a codec, that employs transforms along the horizontal and vertical direction separably. Previously Han, Saxena & Rose showed that...
In recent years, Transform Domain Wyner-Ziv (TDWZ) video coding has been proposed as an efficient Distributed Video Coding (DVC) solution, which fully or partly exploits the source statistics at the decoder to reduce the computational burden at the encoder. In this paper, a parallel iterative LDPC decoding scheme is proposed to improve the coding efficiency of TDWZ video codecs. The proposed parallel...
Distributed Video Coding (DVC) is a coding paradigm where video statistics are exploited, partially or totally, at the decoder. The performance of such a codec depends on the accuracy of the soft-input information estimated at the decoder, which is affected by the quality of the side information (SI) and the dependency model. This paper studies the discrepancies between the bit planes of the Wyner-Ziv...
H.264/AVC video coding standard with hierarchical bipredictive picture (HBP) generally outperforms the other prediction structures such as ‘IPPP…’ and ‘IBBP…’ through better exploitation of data correlation using the preceding and succeeding reference frames. However, due to the different coding order of frames, the HBP scheme could not fully exploit the data correlations using multiple reference...
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