Structure and procedures for lifting, transferring and moving a person, such as a bed ridden person or one requiring the use of a wheelchair, involve a frame supported on wheels, a horizontal load supporting beam in an upper part of the frame, and a motor-powered winch supported by the frame for movement along the beam. In one embodiment the different sensitivities of the reference pixels RP in the RPA is achieved by designing the pixels to have different light sensitivities with respect to each other. An error function based on the determined solution vector is also determined. The mass is arranged to be slidable over the anode casing. The orifice is formed from two overlapping fabric parts having curved elastic hems, and is slidably positionable across the front of the briefs midline by sliding the inner insert.