 In computer vision the correspondence problem is studied for the case when a computer should solve it automatically with only images as input.Once the correspondence problem has been solved, resulting in a set of image points which are in correspondence, other methods can be applied to this set to reconstruct the position, motion and/or rotation of the corresponding 3D points in the scene.The correspondence problem is also the basis of the particle image velocimetry measurement technique, which is nowadays widely used in the fluid mechanics field to quantitatively measure fluid motion.