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介绍了TWAIN标准的结构和状态转换，以及用TWAIN标准实现的一个虚拟图像扫描设备的原理和实现。
This paper introduces the structure and state transform of the TWAIN standard protocol. And a virtual image scanning driver is accomplished by use of TWAIN.
扫描设备转换成一种形式，系统单元可以处理扫描的文本和图像。
Scanning devices convert scanned text and images into a form that the system unit can process.
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