公开(公告)号：US09116854B2

公开(公告)日：2015-08-25

申请号：US14044041

申请日：2013-10-02

Applicant: National Applied Research Laboratories

Inventor： Chi-Hung Huang ,  Wei-Chung Wang ,  Yung-Hsiang Chen ,  Tzi-Hung Chung ,  Tai-Shan Liao

IPC: G06F17/15 ,  G06T7/00

CPC classification number: G06F17/156 ,  G06T7/00 ,  G06T7/0002 ,  G06T2207/20048 ,  G06T2207/20056 ,  G06T2207/30168

Abstract: An image correlation for images having speckle pattern is evaluated. Modulation transfer function (MTF) curves of speckle-pattern images captured at different times are figured out. Whether a correlation value between the MTF curves meets a threshold is checked. If the correlation value is smaller than the threshold, speckle-pattern images are re-selected for re-figuring out the MTF curves and the correlation value. Thus, error of strain and displacement for digital image correlation owing to blurring images of the on-moving target object is figured out; calculation time of the digital image correlation is reduced; and accuracy on measuring physical parameters of the target object before and after movement is improved for digital image correlation.

Abstract translation: 评估具有斑纹图案的图像的图像相关性。 计算出在不同时间拍摄的斑纹图案的调制传递函数（MTF）曲线。 检查MTF曲线之间的相关值是否满足阈值。 如果相关值小于阈值，则重新选择斑点图案图像以重新计算MTF曲线和相关值。 因此，计算出由于移动目标物体的图像模糊而导致的数字图像相关的应变和位移误差; 数字图像相关的计算时间减少; 并且针对数字图像相关性提高了在移动之前和之后测量目标对象的物理参数的精度。