There is provided an image processing apparatus including a converting unit for converting a level range of an input image signal into a predetermined level range, and an outputting unit for outputting the converted image signal and first identification information which indicates the predetermined level range, the first identification information being correlated with the converted image signal. The injector nozzle injects motor fuel into the air intake to produce an air-fuel mixture. The separated synchronizing signal is subjected to \xbd frequency division in a flip-flop 20 to obtain a clock signal having a period which is two times as much as one horizontal period, and this clock signal is utilized to control switching of the charge pump circuit.