Abstract: A new improved digital speckle correlation method一cross search method wasdescribed in this paper.The method will greatly reduce the computing time, and thus theapplications of digital correlation method using personal computer can be realized.Anewformula for calculating correlation coefficient wais presented based on the probability theoryBy this formula,the measuring accuracy of digital correlation method can be greatly im-proved.Some technique problems for obtaining high precision were discussed. The prim...