Abstract: The present invention is related to a method and an apparatus for distortion detection of a scanned image. The method for distortion detection of a scanned image comprises: a) obtaining a first value representative of a first scanning position for the image; b) obtaining a second value representative of a second scanning position for the image; and c) comparing the first and second values to determine there is a line-drop situation when the first and second values obtained in a sequential order are not predeterminedly sequential values. The apparatus for distortion detection of a scanned image comprises a value generator generating two values respectively representative of two scanning positions for the image, and a comparing unit for comparing the two values to determine there is a line-drop situation when the two values obtained in a sequential order are not predeterminedly sequential values.

Abstract: The present invention is an image scanner adapted to be used for scanning a color image which includes an image sensor which converts the scanned color image into three analog voltage signals, a clock generator which provides a clock for the image sensor outputting the three analog voltage signals in response to the clock, three amplifying switches electrically connected to the image sensor through three respective independent signal paths and respectively having three disablers thereon for respectively enabling/disabling the amplifying switches by utilizing an impedance thereof in order to respectively amplify the three analog voltage signals and transmit one of the amplified voltage signals therethrough at a time, an analog-to-digital converter electrically connected to the three amplifying switches which respectively converts the three analog voltage signals into digital signals and a data-processing device electrically connected to the analog-to-digital converter which receives and stores the digital sign