1. A method of determining at least two motion values of an object moving axially in a scene, said method comprising: capturing a first and second image of the object in the scene with an image capture device, wherein said object is axially displaced in the scene between the captured images with respect to a sensor plane of the image capture device; determining a variation in blur between said first and second captured images; determining a scale change of the object between said first and second captured images; determining, using the determined scale change and variation in blur, at least two motion values of the object in the scene, wherein said motion values identify the depths of the object in the first and second captured images and axial motion of the object in the scene.