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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,...
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...
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...
This paper presents a fast mode decision algorithm for H.264/AVC encoding optimization. The algorithm is based on probabilistic learning. Spatial correlation between neighboring macroblocks is exploited by K-means clustering to predict the best candidate mode for the current macroblock. Early termination strategy is designed for skipping unnecessary mode checking. Extensive experiments shows that...
An efficient and fast mode decision algorithm for H.264/AVC Intra prediction is proposed in this paper. Overlapping interval differences (OID) are calculated in the domain composed of samples of current block and reconstructed samples of neighboring blocks. The OID can represent the direction error of each prediction mode. Smaller direction error means that the corresponding prediction mode will be...
This paper presents two low complexity macroblock-level MAD (Mean Absolute Difference) prediction algorithms for H.264/AVC rate control. Both of the algorithms consider the rate-distortion performance and its hardware cost jointly. One of the algorithms predicts the MAD value by observing the motion vector of the surrounding macroblocks (MB), the other one uses numerical analysis to find the best...
The H.264/AVC video coding standard adopts a robust rate-distortion optimization (RDO) arithmetic to select the best intra coding mode. As a result, it brings about large complexity and computational load. In this paper, a fast intra coding mode selection algorithm based on the greyscale for the H.264/AVC video coding standard is proposed. The algorithm dramatically reduces computational complexity...
H.264/AVC video coding standard uses the rate distortion optimization method which determines the best coding mode for macroblock (MB) to improve coding efficiency. Whereas RDO selects the best coding mode, it causes the heavy computational burden comparing with previous standards. In this paper, a fast intra prediction mode decision algorithm using two-path structure is proposed. In the first path,...
In order to achieve the high compression efficiency, H.264/AVC adopts rate-distortion optimization ( RDO ) technology with full mode search in intra prediction. The computational complexity is so high that it isn't fit for real time encoding and hardware design. So we proposed a fast and efficient intra prediction algorithm. We choose intra luma 4times4 or intra luma 16times16 based on smooth degree...
Despite its remarkable coding efficiency, the computational complexity of the spatial-domain intra prediction scheme of H.264 remains a challenging issue especially for applications of the high profile, as it incorporates the additional intra 8times8 prediction mode. To address this issue, we propose in this paper a fast selective intra mode decision algorithm that exploits a newly discovered property...
The rate-distortion optimization framework employed in H.264 for the selection of best coding mode is computationally expensive, although it achieves remarkable coding efficiency. In this paper, an integrated intra prediction algorithm for intra-frame coding of the H.264 high profile is proposed. It consists of two components: a variance-based method for macroblock mode decision and an improved filter-based...
In this paper, a fast mode decision algorithm for intra prediction in the H.264/AVC is proposed. We use the characteristics of each directional prediction mode to compute the strength of directional differences in the original pixel domain to find the minimal direction error. This is the first time reported in the literature that the intrinsic differences between the real-data and the predictors of...
H.264, MPEG-4 Part 10, is the latest digital video coding standard that is noted for achieving very high data compression by using several new coding features. One of the key features is the intra prediction based on the rate distortion optimization (RDO) procedure, which requires a true encoding of the intra block by trying all intra prediction modes. The computational burden of intra prediction...
Intra coding in H.264/AVC has significantly enhanced the video compression efficiency. However, computation complexity increases by the rate-distortion (RD) based mode decision. This paper proposes a fast block type decision algorithm which can reduce intra predictionpsilas computation complexity with slight PSNR reduction. This algorithm is based on the relation of smoothness of macroblocks (MBs)...
This paper presents a novel fractional motion estimation using motion prediction and fast search pattern for H.264/AVC. Fractional motion estimation improves coding efficiency and image quality. However, it requires additional computational overheads such as interpolation and fractional pixel search. To reduce fractional search computation, we propose a novel fast fractional search algorithm by combining...
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