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As a novel branch of widely used Wi-Fi technology, IEEE 802.11n has improved its maximum data rate to 600Mbps, which makes the transmission of high-definition video possible. Although many techniques have been adopted to maximize data rate for high definition(HD) video transmission, very few researches keep an eye on video distortion in parallel with proper data rate. In this paper, we present a cross-layer...
In this paper, a new efficient H.264 intra prediction scheme is introduced. The new prediction scheme is called Best Prediction Matrix Mode (BPMM). The main idea behind the new prediction scheme is to combine the most usable intra prediction modes, {vertical — horizontal — DC}, into a new efficient prediction mode. The performance of our proposed prediction scheme is evaluated using VHDL implementation...
The original data of one view video is huge and that of multi-view video is much more. So, data compression is important for multi-views, and data compression is a key technology for multi-views. In this paper, we explore an efficient fractal video codec with multi-views. From the experimental results with the proposed method and other state of the art methods, we can conclude that the proposed algorithm...
This paper proposes an error resilient video coding algorithm in H.264/AVC for packet-loss networks, which involves an inter frame prediction scheme and a joint source-channel rate-distortion optimization (RDO) function for both inter mode decision and motion estimation. The suggested inter frame prediction and joint source-channel RDO function can significantly reduce the error propagation effect...
This work presents a novel Intra prediction architecture for the hardware High Efficiency Video Coding (HEVC) encoder. The architecture supports full range of features included in the standard, in accordance with the Main and Main 10 profiles, i.e. all modes and all Prediction Unit (PU) sizes. The architecture embeds the internal RAM working at the doubled clock rate to provide quick access to reference...
Fractal based video compression promises to be an attractive technique due to its resolution independence and high compression property. The fractal video coding takes an advantage of self similarity within a frame and also between the successive frames in a video for compression. A new full search motion estimation algorithm is presented in this paper that uses FFT based circular cross-correlation...
A method for the progressive lossy-to-lossless coding of arbitrarily-sampled image data is proposed. Through experimental results, the proposed method is demonstrated to have a rate-distortion performance that is vastly superior to that of the state-of-the-art image-tree (IT) coding scheme. In particular, at intermediate rates (i.e., in progressive decoding scenarios), the proposed method yields image...
Vector quantization (VQ) is a simple and useful data compression algorithm which has been widely applied in many fields such as image processing and pattern recognition. Because each data block is encoded by only one approximate vector in the codebook, the accuracy of the reconstructed blocks is usually poor in VQ. In this paper, the bilinear vector quantization (BVQ) algorithm is proposed with simple...
We derive an optimization framework for joint view and rate scalable coding of multi-view video content represented in the texture plus depth format. The optimization enables the sender to select the subset of coded views and their encoding rates such that the aggregate distortion over a continuum of synthesized views is minimized. We construct the view-rate scalable bitstream such that it delivers...
This paper presents a novel video coding system based on High Efficiency Video Coding (HEVC) for telemedicine applications. The proposed system follows a two-layer design approach which employs the next-generation HEVC video compression standard for the base layer. The enhancement layer includes additional information for refining the quality of a user-defined region of interest (ROI) in each video...
Depth map coding plays a crucial role in 3D Video communication systems based on the “Multi-view Video plus Depth” representation as view synthesis performance is strongly affected by the accuracy of depth information, especially at edges in the depth map image. In this paper an efficient algorithm for edge-preserving intra depth compression based on H.264/AVC is presented. The proposed method introduces...
In this paper, we propose a content adaptive transform (CAT) method for video coding. Firstly, CAT obtains the transform kernels in real-time instead of predefined fixed ones, and therefore it is content based transform. Secondly, the transform kernels is obtained by singular value decomposition (SVD) from a typical decoded block without transmitting them to the decoder. Thirdly, the optimality property...
Fast intra mode decision algorithms in video coding are very useful and necessary for practical real-time encoder implementation. It reduces the computational complexity by eliminating unlikely modes from candidate set. However, most of these algorithms may lead to the noticeable quality degradation, especially for the all intra coding scenario. To overcome the quality loss while maintaining the fast...
In this paper, an improve rate control algorithm for H.264 is proposed which takes image complexity and motion information into consideration to predict the Mean Absolute Difference (MAD). The changes of MAD are adopted to represent the image complexity, and compute the target bit of the current basic unit. Experimental results show that compared with the algorithms of JVT-G012, the bitrate of proposed...
Scalability within media coding allows for content adaptation towards heterogeneous user contexts and enables in-network adaptation. However, there is no straightforward solution how to encode the content in a scalable way while maximizing rate-distortion performance. In this paper we provide encoding guidelines for scalable video coding based on a survey of media streaming industry solutions and...
JCT-VC joined by ITU-T VCEG and ISO/IEC MPEG is developing a new video coding standard called HEVC to achieve better coding efficiency for the emerging HD or Ultra HD video content. One of the new coding features in HEVC is increasing intra prediction modes from 9 in H.264/AVC to 35. To reduce the computation time, this paper presents a fast intra mode decision algorithm based on direction energy...
The Scalable Video Coding (SVC) standard offers multiple scalabilities while maintaining high coding efficiency. However, the joint coding of multiple scalabilities complicates the rate adaptation as the SVC packets possess different priorities. To address this challenge, we propose in this paper a fast rate adaptation scheme for SVC in absence of the original video sequence. Specifically, we present...
Video compression technologies developed recently have taken advantage of a hybrid approach for better coding efficiency. For example, in the MPEG-4 Advanced Video Coding standard and also the new High Efficiency Video Coding, there are numerous possibilities of motion representation and residual coding options in transform domain. The coding parameters, including block modes, motion vectors, and...
A multiple description coding scheme based on prediction-induced randomly offset quantizers is proposed, where each description encodes one source subset with a small quantization stepsize, and other subsets are predictively coded with a large quantization stepsize. Due to the prediction, the quantization bins that a coefficient belongs to in different descriptions are randomly overlapped with each...
By incorporating the prior of positions, position patch based face hallucination methods can produce high-quality results and save computation time. Given a low-resolution face image, the key issue of these methods is how to encode the input low-resolution patch. However, due to stability and accuracy issues, the coding approaches proposed so far are not satisfactory. In this paper, we present a novel...
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