Fuji Xerox Co., Ltd.

Fumio Asano

Takashi Ozawa

Eiji Nishikawa

A voltage having a polarity opposite to that of a voltage used applied to a light source in a period for reading or recording of a picture image is applied to the light source during predetermined periods other than the operational period to realize restoration of luminance of the light source, prolongation of operational life of the light source and high speed reading or recording speed.

Method and system of driving light source

A picture image processor wherein a white reference value with respect to an analog output of video data is established in response to a change in luminous energy, and the white reference output is compared with the video data output to obtain a binary signal, and this signal is stored in a memory system; then, the stored signal is subjected to a digital-to-analog conversion to form a reference signal, which is inputted to an A/D converter in synchronism with the respective picture elements of an original reading signal, and/or a dark or bright voltage value of the image sensor which has been previously stored is corrected on the basis of such gain from an amplifying means which changes automatically, and the output of the above image sensor is corrected based on the voltage value thus corrected.

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Kanagawa, Japan

Fumio Asano