Patent ID: 7224370

Claim:
A method of visual communication between a signal transmitting device and a signal receiving device comprising: adjusting a display unit of said signal transmitting device and a visual recording device of said signal receiving device and using an alternating display process to establish a visual connection between said display unit and said visual recording device; encoding a signal pattern as a visual image pattern using a generated signal template of said signal transmitting device; visually transmitting the visual image pattern through free space from the display unit of said signal transmitting device; receiving the visual image pattern using the visual recording device of said signal receiving device; and decoding the signal pattern from the visual image pattern using an image decoder of the signal receiving device, wherein adjusting the visual recording device includes the steps of: automatically adjusting pan and tilt of the visual recording device to have a view of the visual image pattern displayed by the display unit; and automatically adjusting an angle size of the visual recording device, and wherein automatically adjusting the pan and tilt for the visual recording device comprises: selecting a first tilt and a first pan position; panning for a position that does not overlap said first pan position; checking if panning positions have been exhausted; determining whether the first tilt is in a horizontal position if all panning positions have been exhausted; and determining a new tilt by moving the first tilt upwards for the value of h/2 if the first tilt is in a horizontal position.