A method for operating a mouse wheel of a mouse of a computer according to a position of a cursor pointer of the mouse is provided. The antenna is a helical multiple layer, multi-turn coil having an axis of revolution oriented at an angle, preferably ninety degrees, with respect to the major body plane of the rfid integrated circuit. In some embodiments, the number of light levels and their respective light settings may be determined based on trial exposure images acquired at a single global focus height which is a best height for an entire region of interest, rather than the best focus height for just the darkest or brightest image pixels in a region of interest. The DTV apparatus includes a digital signal receiving unit, a detection unit, and a processing unit.