Study and application of speckle correlation measurement method for displacement fields of model 模型位移场的散斑互相关法测量技术研究及应用
Research on de - cross - correlation methods based on time axis perturbation in multi - channel acoustic echo cancellation 多路声回波对消中基于时基微扰的去互相关法的研究
The generalized correlation method is choosed as the method of time delay estimation in this dissertation . and a optimal arithmetic is educed by analyzing and contrasting many arithmetics at present 本论文采用广义互相关法作为时延估计方法,对现有的多种算法作了分析研究,并通过对比仿真得出了最优算法。
2 . time delay estdriation methods based on cross - correlation and generalised ctoss correlation ( gcc ) , are investigated , and their relationship is discussed . then the pefformance of several time delay estboation methods is theoretically analyzed 2 )研究了互相关法、广义互相关法等几种基本的时延估计方法,并给出了它们之间的联系,对各种方法的时延估计性能进行了理论分析。
The computational results of the particle images are agreement with the simulated datain reasonable , the most absolute difference of the displacement is 0 . 6671 pixel at the x abscissa and 0 . 7928 pixel at y abscissa ; the computational results are equal to the data form the algorithm of particle brightness - distribution pattern tracking ( the conventional cross - correlation algorithm ) at voluminous points , their discrepancy is only one pixel at few points , mostly in boundary area 西安理工大学硕士学位论文最后,在visualfortran环境下给出了这种算法的具体实现,处理模拟粒子图像的结果与模拟数据比较吻合,最大位移绝对误差在x方向是0 . 6671像素,在y方向是0 . 7928像素;计算结果与示踪粒子灰度分布模板法(基本的互相关法)在绝大部分点是相同的,只在少数点相差一个像素,而且大多出现在边界区域。