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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...
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...
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...
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...
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...
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...
This paper presents an efficient method in deciding macro-block mode and selecting prediction mode for intra prediction in H.264/AVC high profile. H.264/AVC supports nine intra prediction modes for luminance 4x4 and 8x8 blocks. The predictors include 8 directional modes and intra DC mode, which is non-directional mode. For luminance 16x16 blocks, the following 4 intra prediction modes are used: Vertical,...
The mode decision in the intra prediction of a H.264/AVC encoder requires complicated computations, and spends much time to select the best mode that achieves the minimum rate-distortion (RD). The complicated computations for the mode decision cause the difficulty in real-time applications, especially for software based encoders. This study creates an efficient fast algorithm, which is called Extreme...
The flexibility of video transmission and decoding has been greatly enhanced by Scalable video coding (SVC). But the coding complexity is also increased because of the inter-layer prediction mechanism. To solve this problem, we propose a fast mode decision algorithm for intra prediction. First, we simplify the process of inter-layer intra prediction using the statistical mode distribution of the enhancement...
Recently, scalable video coding technique has attracted a lot of attention for its desired scalable functionality and coding efficiency. H.264/SVC encodes a video in a hierarchical way by which the coded bit stream can satisfy terminals with different capability of display and different condition of network at the same time. However, the huge computational complexity of mode decision causes difficulties...
Error concealment methods on the stereoscopic video coding are mainly studied in cases of chess board type MB loss and/or continuous slice loss, and are less concerned for entire frame loss. In this paper, a novel error concealment scheme is proposed, dealing with the loss of an entire video frame in the right view sequence of a stereoscopic video. By the analysis of inter-view coding correlation,...
H.264 introduces a technology of intra-prediction to improve the coding efficiency of I frames, but also greatly increased the computational complexity of encoding. This paper proposes a fast intra- prediction mode selection algorithm. The algorithm predicted macroblock boundaries and the fast intra- prediction mode selection to speed up encoding rate. The result of experiments show that the proposed...
In order to get the best mode, H.264 computes the cost of every mode for each block by RDO (rate distortion optimization) technique, but it increases a high computational complexity .This paper combines Pan's fast algorithm and an efficient fast mode decision for intra prediction is proposed. First, the intra prediction's types are decided by whether a block is smooth. Second, the Pan's fast algorithm...
RGB color signals encoding is more desirable for high resolution and accurate definition for saturations and hue. This paper presents a region adaptive inter-color prediction scheme for 4:4:4 RGB signals, which treats G component as a primary component and predicts B/R component from G component with different weighting factors based on different texture regions. The proposed algorithm demonstrates...
The relevance of the spatial domain is mainly eliminated by intra-prediction encoding. First, the traditional intra-prediction algorithms are introduced. And then, according to the correlation between the most likely mode and the best mode, a mode matrix is arrived at, the use of this mode matrix for early termination. The experimental results show that when we use this matrix in the proposed algorithm,...
In this paper, we present a simple but efficient algorithm for intra prediction mode decision in H.264/AVC. Based on our investigation, the DC mode appears to be the superior prediction mode among various candidates. We propose an intra-mode decision algorithm where the DC mode is chosen as a candidate for the best prediction mode. Our experimental results show that the proposed algorithm saves 80...
H.264/AVC is the newest video coding standard with high compression efficiency. Especially it adopts traveling algorithm to find the optimal mode for intra-frame prediction in spatial field, so it is quite complex and costs very long encoding-time. In this paper, the proposed fast mode decision scheme consists of two parts: early intra mode detection, which is to select intra 4×4 or intra 16×16 mode...
This paper proposes a fast inter prediction mode decision method for H.264. Motion compensation residuals of macroblock are used to analyze motion characteristics of each portion, and reduce the candidate inter modes to a small subset. Compared with the exhaustive mode search, the proposed method achieves an average 63% reduction in computation time with negligible degradation in visual quality. Compared...
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