1. An image capture system, comprising: a pan-tilt head with a driving-and-supporting mechanism; an image capture module configured to capture images to be mosaicked to form a target mosaic image; wherein the image capture module comprises at least two image capture devices fixed on the driving-and-supporting mechanism and arranged side by side in a horizontal direction or a vertical direction, and lenses of the at least two image capture devices are prime lenses of an identical focal length; a distance obtaining module configured to obtain a distance L between a to-be-captured object and the image capture module; a processor configured to calculate a width P1 of the to-be-captured object which is capable of being currently captured by a first one of the at least two image capture devices in the horizontal direction or the vertical direction based on the distance L and a current visual angle α of the first one of the at least two image capture devices in the horizontal direction or the vertical direction, and calculate a relative rotation angle β of the at least two image capture devices in the horizontal direction or the vertical direction based on the width P1; and a controller configured to transmit a control signal to the driving-and-supporting mechanism based on the relative rotation angle β, so as to control the image capture devices to rotate.