There are provided an image reader, a noise canceller, and an image processor. The image reader reads an image, outputs image data, and generates a horizontal synchronization signal. The noise canceller generates a noise-canceling signal to eliminate a noise entering a horizontal synchronization signal and eliminates a noise from a horizontal synchronization signal. The image processor captures effective image data out of image data transferred from the image reader correspondingly to a timing when the horizontal synchronization signal changes from a first signal level to a second signal level. The noise canceller generates a noise-canceling signal from a noise detection signal or image data generated in the image reader.