The present invention relates to a method for calculating a displacement of a target object, the method comprising calculating 101 a displacement model of the target object from adjacent images of a set of pre-acquired images of the target object, the displacement model comprising Reflect the position of the target object over time. The method determines a first subset S1 of images from the set of pre-acquired images within a one-cycle time cycle of the set of pre-acquired images based on a displacement model, from a newly acquired image A first step 103 for identifying a second subset S2 of images, wherein the images in the second subset S2 of the images are contiguous and are the same most similar in the first subset S1 of the images A first set of similarities is determined by comparing a given image of the newly acquired images with each image of the first subset S1 of the images, the most similar image being A first step 103 for identifying which has the highest similarity in the first set of similarities, a first selecting a given image in the second subset S2 of said images as a first reference image I1. Step 104, a second step 105 of identifying a third subset S3 of images from the newly acquired image, wherein the images in the third subset S3 of the images are contiguous, and A set of similarities is determined by comparing a given image of the newly acquired images with each image of the first subset S1 of images having the same most similar image within one subset S1； The most similar image has the highest similarity in the set of similarities, a second step 105 to identify, a given image in the third subset S3 of the images as a second reference image I2 The method further includes a second step of selecting 106, and a step of calculating 107 a displacement between the second reference image I2 and the first reference image I1. The invention also relates to a corresponding displacement calculation system.本発明は、対象物体の変位を計算する方法に関し、この方法は、前記対象物体の事前取得画像のセットの隣接
