1. A method for tracking object images in video files, comprising the steps of: receiving a video file, wherein the video file comprises a plurality of frames; extracting an image of an object from a particular frame in the video file; extracting a subsequent image of an object from a subsequent frame in the video file; calculating a similarity value between the extracted object image from the particular frame and the subsequent extracted object image in the subsequent frame; and if the calculated similarity value exceeds a predetermined similarity threshold, collecting the extracted object images from the video file into an object group.