I. Introduction
Infrared (IR) imaging allows the representation of the skin temperature distribution of the human body. The physiological fundament for using IR thermal imagery in medicine resides in the fact that the skin temperature distribution of the human body depends on the complex relationships defining the heat exchange processes between skin tissue, inner tissues, local vasculature, metabolic activity, and the regulating of the sympathetic and parasympathetic activity to maintain the homeostasis. The presence of a disease, then, locally interferes with the heat balance resulting in an increase or in a decrease of the skin temperature, both with respect to the surrounding regions or the unaffected contra lateral region. Qualitative searching for hyperthermal or hypothermal spots and/or asymmetric thermal patterns in contra lateral regions has constituted for long time the only diagnostic approach based on thermal imagery [1].