A solid state image sensor includes a pixel array, as well as charge-to-voltage converters, reset gates, and amplifiers each shared by a plurality of pixels in the array. A method includes imaging at least a portion of a top surface of the structure. Coupling with sensors and logical control allows illumination intensity and spectrum to be varied according to changing user needs. The control unit receives a first move detection signal outputted by the first sensing unit, and receives a second move detection signal from the second sensing unit.