34. The apparatus of claim 33 further comprising: first and second image sensors.
33. The apparatus of claim 30 , further comprising: a display in communication with said processor; wherein: said sensor comprises an image sensor, said image sensor having a field of view; said processor is adapted to define a region in said field of view, said region being smaller than said field of view; said image sensor is adapted to obtain at least one image of said field of view with said actor input therein and said actor input in said region; said display is adapted to output at least a portion of said field of view; said processor is adapted to identify at least one structural geometric salient feature of said actor from said actor input in said region in said at least one image.