| 摘要 |
An image scanning apparatus and method for converting analog signal into digital signal corresponding to an operation mode is disclosed. The image scanning device and method include an input unit for selectively inputting an operation mode based on a document to be scanned, an image sensor for scanning the image of the document corresponding to the selected operation mode in order to output the image as an analog image signal. The apparatus and method also include an analog to digital (A/D) unit for converting the scanned analog image signal into a digital image signal by variably applying an upper reference voltage and a lower reference voltage corresponding to the selected operation mode. The apparatus and method further include a control unit for controlling the A/D unit to convert the analog image signal into the digital image signal corresponding to the selected operation mode.
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