基于小波变换的新型数字散斑相关方法

New method of digital speckle correlation based on wavelet transform

通过将小波分析的方法应用到传统的空域相关计算中,提出了基于小波变换的数字散斑相关方法。详细介绍了该方法的原理,并对传统空域相关方法与小波相关方法进行了实验计算比较。实验结果表明,与传统的空域相关方法相比,基于小波变换的数字散斑相关方法大大提高了相关计算的精度,精度由0 05像素提高到了0 01像素以下。最后利用该方法测量了编织结构复合材料板在三点弯曲载荷作用下的位移场。

The wavelet analysis method is applied to traditional correlation method .A new method based on the wavelet transform is developed and the principle of this method is presented.An experiment comparing traditional correlation method to wavelet correlation method is completed. Finally, the displacement field measurements of braided composite under the threepoint loading is realized .The experiment results show that the new method greatly improve the measuring precision from 0.05pixel to 0.01pixel.