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In this paper, a novel weighted cross prediction (WCP) mode is proposed to replace DC mode in Intra_4times4 prediction of H.264/AVC. In the proposed scheme, the upper right part of one 4times4 block mainly employs vertical prediction while the lower left part mainly uses horizontal prediction, predicting both in vertical and horizontal directions in one block. This scheme uses simple prediction equations...
This paper proposes an improved intra prediction method for H.264/AVC. The conventional method uses only adjoining pixels as reference pixels. The residual energy is increased if the decoded pixels are occluded, which would result in low coding efficiency. In addition, the conventional prediction method copies the same weighted prediction value to several of the pixels lying in the prediction direction...
In the past decade, machine learning techniques have made great progress. Inspired by the recent advancement on semi-supervised learning techniques, we propose a novel learning-based multiview video compression framework. Our scheme can efficiently compress the multiview video represented by multiview-video-plus-depth (MVD) format. We model the multiview video compression problem as a semi-supervised...
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...
This paper proposes a novel fast algorithm for reducing the computational complexity in intra mode prediction process of H.264/AVC. The proposed method makes use of the temporal correlation between adjacent frames. It is observed that most of selected modes of the co-located macroblock (MB) in the previous frame are the same as the best modes of MB in the current frame and that the sum of the absolute...
A novel fast integer-pixel multi-pattern search algorithm is proposed in this paper. The cross search pattern (CSP) is used to get the coarse position of the best matching point, then small diamond search pattern (SDSP) or small square search pattern (SSSP) is chosen to locate the best matching point accurately according to the size of the partitioned block. In order to reduce the number of search...
One of the advantages of H264/AVC video coding standard is its new algorithms in intra coding mode, but making decision among all these prediction modes needs some complex computation so it makes a bottleneck in implementation of a real-time video codec. In this paper a new and simple method for intra prediction mode decision has been proposed and also implemented on a DM648 TI DSP. Experimental results...
The newly proposed video coding standard H.264/AVC by JVT can achieve much higher efficiency than previous standards. Unfortunately this comes at a cost in greatly increased complexity at the encoder mainly due to motion estimation (ME) and inter /intra prediction block mode decision. In this paper, we propose a fast mode decision algorithm for H.264/AVC based on all-zero blocks predetermination....
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...
Transporting hybrid coded video over wireless channel is very challenging. Efficient coding and compression techniques are required to meet the QoS (Quality of Service) requirements of such services. H.264, the latest coding and compression standard from ITU-T, is currently dominating the field by offering a flexible architecture and compression gain of up to 50%. In H.264, intra frame prediction...
The paper reports a new fast intra prediction algorithms based on separating the transformed coefficients of neighboring blocks. The prediction blocks are obtained from the transformed and quantized neighboring blocks that generate minimum distortion for each DC and AC coefficients. To obtain fast coding with comparable coding efficiency compared to H.264/AVC, we present the full block search prediction...
We describe a method that considerably improves the computational behaviour of H.264 intra-only encoders. Such intra-only encoders come to use in video-cutting and low-latency video coding where temporal prediction via using inter-frames is no feasible option. We identify the spatial prediction step as the computational bottleneck in intra-only encoders. In this step, the encoder tests various modes...
The scalable video coding (SVC) standard adopts the inter-layer residual prediction (ILRP) algorithm to encode the residual signal of the enhancement layer (EL). The ILRP reduces the number of bits required for encoding the residual signal but incurs excessive encoding time. In this paper, we propose a fast encoding algorithm for SVC-based video streaming. In this algorithm, the ILRP is selectively...
We propose a fast intra mode skip decision algorithm for H.264/AVC video encoding. Although intra macroblock encoding algorithm based on various prediction methods in the pixel domain increases compression ratio, it requires a significant increase in the computational complexity. To reduce the processing time for the inter frame encoding, we propose a fast intra mode skip decision scheme based on...
In this paper we propose a content aware fast block matching motion estimation algorithm that can reduce the computation complexity of motion estimation module in H.264/AVC while maintaining almost same coding efficiency. In the first step inter block correlation is used to define a correlation coefficient that helps to identify the motion content of the current block. Based on this coefficient the...
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...
The seven prediction modes for P-slice provided in the inter-frame coding tool of H.264/AVC enables significant compression gain but at the cost of computational complexity. To address the issue, we propose in this paper a fast mode decision algorithm that is able to reduce the computational complexity of this coding tool by exploiting the coding modes of previously coded neighboring blocks and by...
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)...
H.264 is the currently state-of-the-art video compression standard performing significant improvement in coding efficiency and quality compared to other existing standard, such as MPEG-4 and H.263. The standard adapts a lot of novel techniques, like intra prediction, inter prediction and integer DCT(integer discrete cosine transform), to exploits high operational complexity for reducing spatial and...
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