中文摘要：

为了降低数字图像相关方法测得的位移场不协调导致的应变误差，采用有限元法中的分片光滑概念和最小二乘法拟合出连续位移场，对位移场求导得到应变场。实验结果表明，光滑后的位移和应变误差得到了明显改善。

英文摘要：

In order to reduce the error in strain which is caused by the digtial image correlation method, an approach is proposed in which a continuous displacement field is constructed firstly to fit the discrete measure points by the technique used in the finite element method and the least square method, then the strain is calculated from the continuous displacement field. The results indicate that error in displacement and strain can be significantly reduced by the proposed approach.