1. A method for determining an amplitude of an infrared object, comprising: receiving an infrared image of the object from a sensor, the infrared image including an amplitude and position coordinates associated with the object; expressing the amplitude as a function of the position coordinates; minimizing a sum of squared residuals by subtracting and squaring the received infrared image of the object from a model of the received infrared image of the object, the model being expressed as a function of a point spread function of the sensor; determining a centroid location of the model of the received infrared image of the object, and determining the amplitude based at least in part on the centroid location.