Passive ranging using image intensity and contrast measurement

We have suggested two passive ranging approaches using single camera, intensity and contrast based. According to Beer-Lambert law and known atmosphere extinction coefficient and initial range, the range to moving object is estimated. Using these approaches in a real infrared sequence we obtained better results than by the method based on image size measurements. The relative error of 3.2% for contrast and 2.3% for intensity features are obtained. Results indicate that this way of range estimation can provide a fidelity required for object tracking.