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Publications
Publications (16)
Rate-Distortion Optimized Quantization (RDOQ) brings significant improvement of coding performance in High Efficiency Video Coding (HEVC). However, it results in high computational complexity to determine the best quantization levels for each transform coefficient when applying rate and distortion optimization operation. In this paper, we firstly p...
Wavefront parallelism is effective for parallel video encoding thanks to its merits of low latency, no quality loss and high degree of parallelism. In traditional video encoders, macroblock row wavefront (MRW) parallelism was widely adopted. However the performance of MRW is limited by workload unbalance and computing resource unbalance among multi...
Recent local stereo matching methods have achieved comparable performance with global methods. However, the final disparity map still contains significant outliers. In this article, the authors propose a local stereo matching method that employs a new combined cost approach and a secondary disparity refinement mechanism. They formulate combined cos...
Recent cost-volume filtering-based local stereo methods have achieved comparable accuracy with global methods. However, there are still some significant outliers existing in the final disparity map. In this paper, we propose a cost-volume filtering-based local stereo matching method that employs a new combined cost and a novel secondary disparity r...
Compared with H.264, the High Efficiency Video Coding standard has higher compression efficiency and better transmission performance, and will be used in wider field. TZ search method is adopted to perform integer pixel search in HEVC. Its performance is very perfect but very time-consuming. In this paper, we use hexagon search method in place of T...
In this paper, we propose a hybrid parallel decoding strategy for HEVC which combines task-level parallelism and datalevel parallelism based on CTUs. The data-level parallelism makes the execution time distribution of different decoding stages more balanced, and makes the task-level parallelism more efficient. Our approach imposes no constraint on...
In conventional motion compensation, prediction block is related only with one motion vector for P frame. Multihypothesis motion compensation (MHMC) is proposed to improve the prediction performance of conventional motion compensation. However, multiple motion vectors have to be searched and coded for MHMC. In this paper, we propose a new low-cost...
The High Efficiency Video Coding has a significant compression performance benefit versus previous standards. Thanks to the high efficiency prediction tools, blocks with all-zero quantized transform coefficients are quite common in HEVC. The computation load of transform and quantization can be remarkably reduced if the all-zero blocks can be detec...
A novel HW-based video up-scaling method proposed in this paper performs the video image up-scaling. Based on the geometry similarity between the original image and the target image, the proposed algorithm produces new pixels by exploiting the directional weights from the errors estimated by a preset interpolation model in the local area, and using...
MB-level parallelism is widely used in parallel video coding thanks to its merits of low latency, no performance loss and high degree of parallelism. Most of video encoders with MB-level parallelism employ MB Row Scheduling (MRS) scheme. In software video encoder, early terminate algorithms tend to cause significant difference in coding time of dif...
HEVC (High Efficiency Video Coding) has recently been published as the next generation video coding standard. Compared with previous standards, the coding efficiency is greatly improved at the cost of much higher codec complexity. On the other hand, ARM with SIMD (Single Instruction Multiple Data) instructions is widely deployed on mobile platform,...
Nowadays, mobile devices are capable of displaying video up to HD resolution. In this paper, we propose two acceleration strategies for Audio Video coding Standard (AVS) software decoder on multi-core ARM NEON platform. Firstly, data level parallelism is utilized to effectively use the SIMD capability of NEON and key modules are redesigned to make...
With the development of hardware technologies, multi-core processor becomes more and more popular. At the same time, the performance of video encoding technologies is greatly improved at the cost of complexity. How to exploit the computing capacity of the multi-core processors efficiently to meet the demand of video encoding technology is a challen...
A Depth Template based 2D-to-3D Video Conversion and Coding system (DTVCC) is proposed by this paper. In DTVCC, triangle meshes are exploited to describe depth template for scenes in 2D video, an interactive system is designed to generate reliable depth template, depth map can be automatically reconstructed based on the depth template and 2D video...
H.264/AVC adopts 9 intra 4×4 prediction modes to improve the intra frame compression efficiency. This makes the intra frame coding and transcoding very complex. In this paper, a fast intra 4×4 mode decision algorithm is proposed to reduce the intra transcoding complexity. Firstly, the surrounding modes in the high bitrate and the modes of the neigh...
The rho-domain rate control algorithm is very simple and effective. There is only one parameter, thetas, used in the model. thetas reflects the relationship between the rate and the quantization step. Accurately estimating the thetas value of the I (intra) frame is important for an efficient rho-domain rate control algorithm because the I frame wil...
