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High Efficiency Video Coding (HEVC) is an ongoing standard, which is an extension of H.264/AVC which is the latest coding standard. In HEVC encoder an exhaustive search method is employed to select the best mode for each macro block which consumes more encoding time. Rate and Distortion tradeoff attained for encoding each macroblock introduces more computation complexity. Although, HEVC has better...
Multiple intra-mode prediction is one of the new features introduced in the emerging video standard, H.264/AVC. Its function is to further reduce spatial redundancies in an intracoded macroblock prior to conventional transform coding and entropy coding. However, the process is computationally expensive especially when Lagrangian cost evaluation is employed. In this paper, we propose a fast algorithm...
The Performance of High Efficiency Video Coding (HEVC) has been improved greatly compared with H.264/AVC including some parallel processing tools to achieve fast implementation on multi-core or many-core platforms. However, CU-level parallel processing is still a challenging issue. In this paper, the relation among spatial motion candidates is analysed firstly. Then, a parallelism spatial candidate...
The latest video coding standard HEVC (High Efficiency Video Coding) provides up to 35 intra prediction modes to achieve more accurate prediction. However, a larger number of prediction modes leads to higher encoding complexity. To accelerate the intra mode decision in HEVC, an improved algorithm based on numerical analysis of the neighboring reference samples of coding units is proposed. Four filters...
Rate control is one of essential techniques in video coding in order to ensure quality of pictures under constraint condition of bandwidth. The rate control algorithm consists of three components: group of pictures (GOP) level rate control, frame level rate control and basic unit level rate control. In this paper, the rate control algorithm at frame level and basic unit level is studied to improve...
H.264/AVC, the international video coding standard developed by ITU-T VCEG and ISO/IEC MPEG, is known to be more efficient than other standards. Higher compression is provided with the parameter block mode of H.264/AVC, but due to its low compression efficiency, researchers tend to ignore the algorithm's intra-prediction coding capability. This study examined this overlooked aspect to determine its...
In this paper, we propose a fast intra-prediction mode decision algorithm based on the probability statistics of the best prediction mode and the relevance of the neighboring blocks for high efficiency video coding (HEVC) to reduce its encoding complexity. The intra prediction candidates are reduced before Rate Distortion Optimization (RDO) procedure by two steps of rough mode decision. Sum of Absolute...
This paper proposes a fast hardware friendly intra block size selection algorithm with simple gradient calculations and the bottom-up structure to solve the high computational demand of intra prediction in the latest HEVC (High Efficiency Video Coding) standard. The simulation results show that the proposed algorithm can save 57.3% encoding time in average for all-intra main case compared to the default...
In this paper, an efficient fast algorithm called Boundary-aided Extreme Value Detection (BEVD) is applied to predict the best direction mode, excluding the DC mode, for H.264/AVC fast intra-mode decision. The BEVD-based two-step edge detection can predict luma-4×4, luma-16x16, and chroma-8×8 modes effectively. Simulation results show that the proposed BEVD method reduces encoding time by 63 %, and...
This paper proposes a new visually lossless image compression technique for display devices. The algorithm explores the differences in error perceptibility of human visual system (HVS) for different image areas. Coding units are classified into smooth, detail and sharp areas based on local complexity and prediction errors. In order to achieve the objectives of imperceptible quality loss and high compression...
In this paper, a hardware-oriented low complexity fast intra prediction algorithm is presented. The proposed algorithm adopts a fast Discrete Cross Differences (DCD) to detect the dominate direction of the coding unit. Based on DCD information, only a subset of the 35 candidate modes are selected for the rough mode decision process. Moreover, four simple but efficient early termination strategies...
An improved method for the TZSearch fast motion estimation algorithm in the Joint Multi-view Video Coding (JMVC) is proposed in this work. It is based on early terminating the calculation of Sum of Absolute Difference (SAD) and increasing the number of predicted motion vectors to reduce the inter-view redundancy and save the encoding time. Experimental results show that the proposed method has much...
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...
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...
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...
In this paper., we propose an efficient temporal DIRECT mode decision algorithm for H.264/AVC inter bi-predictive (B) frame video coding to improve the coding efficiency. In the suggested technique, in addition to the motion vector (MV) of the co-located block we also employ MVs of eight neighboring blocks for DIRECT mode decision. The best MV is selected for DIRECT mode decision based upon the sum...
H.264, MPEG-4 Part 10, is the recent digital video coding standard that achieves very high data compression by using several new coding features. One of the key features is intra prediction which is based on the rate distortion optimization (RDO) procedure, that requires a true encoding of the intra block by trying all intra prediction modes. The computational burden of intra prediction with the RDO...
We consider an application of sparse optimization in the error concealment area. State-of-the-art spatial and temporal error concealment method is improved and compared. By solving for limited numbers of significant predictors using the sparse optimization, our algorithm performs subjectively and objective better for the concealed result.
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