Video transmission on wireless links usually requires some frame aggregation, so that the overhead due to the headers is not a too large percentage of the bit-stream. In such a situation, header error detection is ess...
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ISBN:
(纸本)9781424480166
Video transmission on wireless links usually requires some frame aggregation, so that the overhead due to the headers is not a too large percentage of the bit-stream. In such a situation, header error detection is essential, because any error in the header may cause a loss of several consecutive frames. The contributions of this paper are (i) an improved reception of the length field of the header and (ii) an improved Frame Synchronization (fs) algorithm for aggregated frames. The fs algorithm has the following characteristics: (i) it makes use of the implicit redundancies which are present in the headers, thus resulting in an efficient synchronization of the variable-length frames;(ii) Bayesian hypothesis testing is used to estimate the correct synchronization;(iii) the proposed algorithm performs estimation on-the-fly and does not require reading the whole bit-stream. A comparative performance evaluation with respect to previously proposed algorithms is provided in the context of WiMAX MAC.
In order to achieve the real-time property for video coding, a fast and adaptive algorithm based on starting search point prediction and early-termination strategy is proposed. It analyzes center-bias property and spa...
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In order to achieve the real-time property for video coding, a fast and adaptive algorithm based on starting search point prediction and early-termination strategy is proposed. It analyzes center-bias property and spatial correlation property of motion vector field, and utilizes the respective characteristics of block based gradient descent search (BBGDS) and adaptive rood pattern search (ARPS) algorithm. The proposed algorithm adaptively chooses different searching strategies according to the type of the image, makes full use of the cross image motion vector distribution characteristics and optimizes the traditional ARPS algorithm. The experimental results show that the proposed algorithm is about 2.3∼9.2 times faster than Diamond Search (DS), 1.2∼4.0 times than ARPS. The algorithm can meet the real-time demand without reducing the image quality.
In order to achieve the real-time property for video coding,a fast and adaptive algorithm based on starting search point prediction and early-termination strategy is *** analyzes center-bias property and spatial corre...
详细信息
In order to achieve the real-time property for video coding,a fast and adaptive algorithm based on starting search point prediction and early-termination strategy is *** analyzes center-bias property and spatial correlation property of motion vector field,and utilizes the respective characteristics of block based gradient descent search(BBGDS) and adaptive rood pattern search(ARPS) *** proposed algorithm adaptively chooses different searching strategies according to the type of the image,makes full use of the cross image motion vector distribution characteristics and optimizes the traditional ARPS *** experimental results show that the proposed algorithm is about 2.3～9.2 times faster than Diamond Search(DS),1.2～4.0 times than *** algorithm can meet the realtime demand without reducing the image quality.
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