Abstract: A solid state motion analysis system stores images of an event at a fast frame rate and plays back the images at a slower frame rate to facilitate analysis of the event. The motion analysis system includes a solid state imager which is selectively operable at different frame rates and further includes a solid state memory for storing a plurality of image frames. A video trigger circuit includes a comparison circuit to compare selected images produced by the imager to determine a change in the value of an image characteristic between the images. When a change is determined, the video trigger circuit produces a trigger signal to alter the mode of operation of the motion analysis system. Thus, storage of image frames may be started or stopped when a difference in luminance or color occurs between successive image frames, such difference indicating a change in the event.