An image processing system includes camera modules each including an imager configured to acquire an image at the timing of a vertical synchronization signal, and a phase controller configured to control the phase of the vertical synchronization signal, and each configured to output the vertical synchronization signal together with a corresponding one of image signals of images of different imaging fields; a phase monitoring unit configured to compare the phases of the vertical synchronization signals from the camera modules; a relative phase control unit configured to output a relative phase control signal to the phase controller of each camera module at a predetermined cycle such that the vertical synchronization signals monitored by the phase monitoring unit are synchronized with each other; and an image synthesizing unit configured to synthesize the images at the timing of the synchronized and controlled vertical synchronization signal to generate a single synthesized image.