1. A method of processing image data, the method comprising: capturing image data of a subject of interest from each of a plurality of camera positions and constructing a three-dimensional model of the subject of interest based on the captured image data, the three-dimensional model having an unknown scale; transmitting a radio signal from a first one of the camera positions and measuring a reflection profile for the transmitted radio signal; generating a simulated reflection profile corresponding to the first one of the camera positions; and calculating a first estimate of the unknown scale for the three-dimensional model by comparing the measured reflection profile to the simulated reflection profile.