| 摘要 |
A document reading apparatus is disclosed. The document reading apparatus includes a scanner; an energy-saving power supply unit; an energy-saving control unit; a clock IC; an output compensation unit for updating digital conversion parameters including image signal amplification gain such that image data of a reference white board read by a CCD of the scanner are made into a proper value; and an output compensation controlling unit. The output compensation controlling unit reads time data when an operation mode is shifted from pause mode to waiting mode, stores the digital conversion parameters updated by the output compensation unit in a non-volatile memory, updates operation time with the present time if the elapsed time from a previous operation time stored in the non-volatile memory is equal to or greater than a setup value, and uses the digital conversion parameters stored in the non-volatile memory as they are, if the elapsed time from the previous operation time stored in the non-volatile memory is less than the setup value.
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