A new method using plane fitting to decide whether a domain block is similar enough to a given range block is proposed in this paper. First, three coefficients are computed for describing each range and domain block. ...A new method using plane fitting to decide whether a domain block is similar enough to a given range block is proposed in this paper. First, three coefficients are computed for describing each range and domain block. Then, the best-matched one for every range block is obtained by analysing the relation between their coefficients. Experimental results show that the proposed method can shorten encoding time markedly, while the retrieved image quality is still acceptable. In the decoding step, a kind of simple line fitting on block boundaries is used to reduce blocking effects. At the same time, the proposed method can also achieve a high compression ratio.展开更多
本文提出了一种无限长时间序列的分段线性拟合(Infinite Time Series-Piecewice Linear Fitting,简称ITS-PLF)算法,该算法根据关键点保持时间段的统计特性,确定选择关键点的区间范围;若极值点的保持时间段不在区间范围,则根据包含极值...本文提出了一种无限长时间序列的分段线性拟合(Infinite Time Series-Piecewice Linear Fitting,简称ITS-PLF)算法,该算法根据关键点保持时间段的统计特性,确定选择关键点的区间范围;若极值点的保持时间段不在区间范围,则根据包含极值点的连续三个时间数据之间的夹角与筛选角度之间的关系,判断该极值点成为关键点的可能性.实验表明,ITS-PLF算法的执行不依赖于时间序列长度及领域知识,可以有效识别关键点,并可根据数据压缩率的变化实现自适应拟合.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61173183, 60973152, and 60573172)the Special Scientific Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20070141014)the Natural Science Foundation of Liaoning Province, China (Grant No. 20082165)
文摘A new method using plane fitting to decide whether a domain block is similar enough to a given range block is proposed in this paper. First, three coefficients are computed for describing each range and domain block. Then, the best-matched one for every range block is obtained by analysing the relation between their coefficients. Experimental results show that the proposed method can shorten encoding time markedly, while the retrieved image quality is still acceptable. In the decoding step, a kind of simple line fitting on block boundaries is used to reduce blocking effects. At the same time, the proposed method can also achieve a high compression ratio.
文摘本文提出了一种无限长时间序列的分段线性拟合(Infinite Time Series-Piecewice Linear Fitting,简称ITS-PLF)算法,该算法根据关键点保持时间段的统计特性,确定选择关键点的区间范围;若极值点的保持时间段不在区间范围,则根据包含极值点的连续三个时间数据之间的夹角与筛选角度之间的关系,判断该极值点成为关键点的可能性.实验表明,ITS-PLF算法的执行不依赖于时间序列长度及领域知识,可以有效识别关键点,并可根据数据压缩率的变化实现自适应拟合.
