Imaging system, imaging controller, and method and program for vertical synchronization

Abstract

An imaging system having an imaging device for producing images of objects and picture signals and an imaging controller connected to the imaging device through a transmission line. The imaging device includes a vertical synchronizing signal-producing circuit to produce an internal vertical synchronizing signal for the production of images of objects. The imaging controller includes a delay-measuring circuit and a vertical-synchronization phase-advancing circuit. In the system, the imaging controller transmits a test signal to the imaging device and receives the test signal returned from the imaging device. The delay-measuring circuit measures a delay of a phase of the returned test signal relative to a phase of the transmitted test signal. The vertical-synchronization phase-advancing circuit then advances a phase of an external vertical synchronizing signal by the delay and transmits the external vertical synchronizing signal to the imaging device. The vertical synchronizing signal-producing circuit at the imaging device is reset by the phase advanced external vertical synchronizing signal transmitted from the vertical-synchronization phase-advancing circuit.