1. A camera system comprising: an image capturing device having a field of view and producing image data representing multiple images of the field of view; an object detection module connected to the image capturing device and receiving the image data, the object detection module being operable to detect objects appearing in one or more of the multiple images; an object tracking module connected to the object detection module and operable to temporally associate instances of a first object detected in a first group of the multiple images, the first object having a first signature representing features of the first object derived from the images of the first group; and a match classifier connected to the object tracking module for matching object instances, the match classifier being operable to match object instances by analyzing data derived from the first signature of the first object and a second signature of a second object, the second object being detected in a second image distinct from the images of the first group, and the second signature representing features of the second object derived from the second image, wherein the match classifier analyzes the first set of data to determine whether or not the second signature matches the first signature, wherein the manner in which the match classifier operates to match object instances has been determined at least in part by a training process that automatically configures the match classifier using a set of possible object features.