As the digital image correlation technique is gradually applied to the tasks such as long-distance multi-point deflection monitoring of engineering structures, camera shake in the non-controlled measurement scenarios such as outdoor scene has become one of the main reasons that affect the measurement accuracy. In order to eliminate the influence of camera shake on target displacement measurement, this study firstly establishes an affine transformation model that represents the camera disturbance movement at a long distance based on the projection model of the pinhole camera movement, and then combines the stable reference points to correct the image point coordinates after the camera movement. To verify the effectiveness of the affine model, three sets of translation experiments are carried out. The experimental results show that when the working distance is greater than 2 m, the affine transformation model effectively eliminates the measurement errors caused by camera shake in a simple way and is not influenced by the depth distributions of the reference and target points.