Patent ID: 9013758
Filing Date: 2015-04-21
Classification: H04N

Abstract:
1. A scanned image calibrating device, comprising: a scanning unit arranged in a paper transmitting path for capturing texts and images on a document and transferring into electrical signals, a set of transmitting device including at least a first transmitting roller and a second transmitting roller that rotates faster than the first transmitting roller, the first transmitting roller being arranged upstream to the scanning unit, the second transmitting roller being arranged downstream to the scanning unit, the distance between the first and the second transmitting rollers being shorter than the length of the document, and no other transmitting roller being arranged between the first and the second transmitting rollers, a paper sensor arranged in the paper transmitting path for detecting position and velocity of the document, the paper sensor including a paper pass sensor and a scan sensor, the paper sensor being arranged next to the first transmitting roller and the scan sensor being arranged next to the scanning unit, and a control unit connected with the paper sensor and the scanning unit to adjust the scan frequency in response to the position and the velocity of the document, wherein the scan sensor is a micro switch and the paper pass sensor is an ultrasonic sensor.