A light source device (12,99,111,135) emits normal illumination light and special illumination light interchangeably at a charge-storage time of an imaging device (23). A DRP (dynamically reconfigurable processor) (40) is reconfigurable between a normal image producing circuit (81) and a special image producing circuit (82). A CPU (41) instructs the reconfiguration of the DRP (40) when detecting that a vertical synchronization signal from a drive circuit (28) falls to zero level. The DRP (40) gains an access to a configuration memory (72) to load circuit information of the normal or special image producing circuit. According to the circuit information loaded, the DRP (40) changes functions and interconnection of processor elements (70).
