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Contact image sensor is a kind of integrated module. It is a combination of an optical, a light sensing and an illumination system; all within one compact system. It is a type of LED sensor having useful applications in scanner technologies. Contact image sensor has become popular as it is a small and economic power source of imaging capability. Contact image sensor can sense any light which incident over its silicon surface. The distance between the document being scanned and the sensor is very less in the contact image sensor.
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