For digital speckle correlation methods, the reliable initial displacement estimation is particularly important to achieve sub-pixel accuracy. Utilizing marker matching technology, a new initial value estimation method is proposed. This method sticks circular markers with high reflection coefficient on the speckles. In order to eliminate the effects of speckles on extracting points, an improved scale invariant feature transform algorithm detecting extreme points within significant edge region is presented, so the redundant feature points are greatly reduced in this way. At last, the homography transformation is executed to complete full field deformation, and the initial value of each pixel in the region of interest is estimated rapidly. Experiments are performed through making speckle plate and the results show that the initial values obtained by the proposed method can reach a fast convergence within 3-4 iterations and consequently get accurate and reliable measurement results.