1. A computer-implemented method of augmenting image data, the method comprising: receiving data of an image captured by a camera; receiving data identifying coordinates of a plurality of labelled feature points defining a detected object in the captured image; storing at least one augmentation image data defining a plurality of augmentation values to be applied to the captured image data; storing at least one augmentation representation including data defining at least one polygonal region of the augmentation image data, the or each polygonal region defined by three or more of vertices, each vertex associated with a corresponding labelled feature point; determining a transformation of the at least one polygonal region of the representation based on the received coordinates of the corresponding feature points; applying the determined transformation to corresponding regions of the augmentation image data defined by the at least one polygonal regions of the augmentation representation; and augmenting the captured image data by applying the transformed at least one portion of the augmentation image data to the corresponding portion of the captured image data.