Body tracking is made possible by combining the Move and PS3's head tracking capability. According to the presentation, the PS3 can also detect faces, going so far as to identify individuals through face contour and feature detection. The software will be able to recognize gender, age, smiles and when eyes open and close.
Coombes explained that all the calculations necessary to handle image processing are done by the Cell CPU, which apparently excels at the doing floating point calculations. The raw data can be processed incredibly quickly by the PS3, taking "under a frame" to translate to a game experience. And while Mikhailov didn't reveal how much of the CPU's overall power the Move controller requires, he did reveal that the memory demands are truly "insignificant" -- 1-2 MB of system memory.