Tracking a person in a scene with a varying amount of illumination

In computer vision, what would be a good approach to tracking a human in the black and white same scene at different times of the day (i.e. different levels of illumination)? The scene will never be dark so I don't need t开发者_如何学Goo worry about searching using infra-red or anything for heat sensing. I need to identify the people and then also track them so there are two parts.

Any advice would be great.

Thanks.

SIFT feature matching works well for this purpose. It is implemented in OpenCV.