Digital speckle correlation method with compensation technique for strain field measurements

摘要: In the strain field measurements, especially in large correlation coefficient values obtained by digital speckle method are usually very low due to relative pixel movement of subset. The measuring error, therefore, is increased. A primary method, that called compensation algorithm, introduced for improving coefficient. flow scheme with algorithm our software developed and some improved techniques reducing calculation time error discussed paper. After obtaining a set displacement data high coefficient, de-noise wavelet processing adopted. It obvious accuracy better then before. testing experiment performed this technique. coefficients can increase from 0.70 0.99, which will be much benefit improvements accuracy.