Electronic endoscope apparatus with noise suppression circuit

Abstract

An electronic endoscope apparatus has an illumination unit for irradiating light of red, light of green and light of blue on an object for photographing in predetermined order at a predetermined period; an image signal generation unit for receiving reflection light from the object, generating a field sequential image signal on the basis of the received reflection light and delivering the field sequential digital image signal; a first memory unit for forming a predetermined look up table; a red data memory unit for storing data of a red image signal by one field; a green data memory unit for storing data of a green image signal by one field; a blue data memory unit for storing data of a blue image signal by one field, one field from the first memory unit being stored in one of the data memory unit for red, green and blue in synchronism with the order and the predetermined period of color illumination by the illumination unit; a switching unit for reading data from one of said data memory unit in synchronism with the order and the period of color illumination by the illumination unit and supplying the data as an addressing data to the first memory unit; and a unit for reading data pieces representative of the red, green and blue image signals from the data memory units and synthesizing the data pieces to produce a color image signal.