1. A method for locating an object an image, comprising: applying a set of parametric transformations to a region in a training image to determine a set of transformed regions, wherein parameters of the parametric transformations are mapped to a Lie algebra, and the region includes an object; determining object descriptors for each transformed regions; training a regression function from the set of parametric transformations and the set of object descriptors; determining the object descriptor from a target image; and applying the regression function to the object descriptor of the target image to determine a location of the object in the target image.