A video imaging apparatus for scanning an area during relative motion in a direction defining a track axis has at least two linear sensors each comprised of at least one array of charge coupled devices. The sensors are oriented substantially perpendicular to the track axis thereby defining a cross-track axis. The arrays are further fixed relative to each other and oriented for simultaneously scanning the same area. A master clock signal is used to readout the data produced by the first sensor. A phase-locked loop produces a slaved, pliant, clock signal for reading the data out of the second sensor. By varying the phase of the slaved clock signal relative to the master clock signal, mechanical offset between the two sensors is compensated. By varying the average frequency of the slaved clock signal relative to the master clock signal, scale differences between the two sensors are compensated. By cyclically varying the instantaneous clock frequency along the cross-track axis of the salved clock signal relative to the master clock signal, lens distortion is compensated. Thus, by utilizing the phase-locked loop to control plural characteristics of the slaved clock signal, the retreival of data from the sensors may be more accurately coordinated and the necessity of costly, complex, off-line post-processing avoided.