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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 H.264/AVC, intra-prediction is utilized in the spatial domain. There are two types of intra prediction for luma-intra 16 times 16 and Intra 4 times 4. Four and nine modes are supported by intra 16 times 16 and intra 4 times 4, respectively. The full search is used to select the best modes in H.264, which is very computationally expensive. In order to speed up the mode selection procedure, a fast...
We present in this paper a fast block matching motion estimation algorithm for H.264/AVC coding standard, based on a study of the motion vector (MV) obtained by the predictive diamond searching algorithm among several test sequences. We found that diamond search is fast and robust for most types of sequence. Based on temporal and spatial motion correlation among adjacent blocks in images, we propose...
Image quality metrics attempt to assess the perceived difference between an original and a distorted image. One aspect of quality assessment that is not yet well understood is the scale at which images are analyzed. This paper examines the effects that two scale-reducing operations, filtering and down-sampling, have on quality assessment. It has been shown that several popular quality metrics are...
The shortages in traditional chaos scrambling scheme are obvious: the limited ability of anti-predicting and the effect of finite word length. To overcome these shortages, a novel image scrambling algorithm is proposed in this paper. Making use of on the well confidentiality that chaos sequence possessed, the proposed image scrambling algorithm has strong randomicity. So it had the merit of increasing...
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