1. A method of calibrating a geometric model of a fingerprint imaging system, the geometric model including a plurality of surface parameters that define the relative positions of surfaces within the fingerprint imaging system at which light is processed, the method comprising: capturing an image of a predetermined target with the fingerprint imaging system, the target including distinguishing points provided at predetermined positions on the target; measuring positions of the distinguishing points in captured image of the target; comparing the measured positions of the distinguishing points in the captured image to positions of the distinguishing points predicted according to the geometric model of the fingerprint imaging system; and adjusting the surface parameters based on the comparison between the measured positions of the distinguishing points and the predicted positions of the distinguishing points.